(19)
(11)EP 3 476 122 B1

(12)EUROPEAN PATENT SPECIFICATION

(45)Mention of the grant of the patent:
16.09.2020 Bulletin 2020/38

(21)Application number: 17736832.1

(22)Date of filing:  22.06.2017
(51)International Patent Classification (IPC): 
H04N 9/31(2006.01)
(86)International application number:
PCT/US2017/038829
(87)International publication number:
WO 2017/223355 (28.12.2017 Gazette  2017/52)

(54)

RENDERING WIDE COLOR GAMUT, TWO-DIMENSIONAL (2D) IMAGES ON THREE-DIMENSIONAL (3D) CAPABLE DISPLAYS

DARSTELLUNG VON 2D-BILDERN AUF 3D-FÄHIGEN DISPLAYS MIT GROSSEM FARBRAUM

RESTITUTION D'IMAGES BIDIMENSIONNELLES (2D) À PALETTE CHROMATIQUE LARGE SUR DES DISPOSITIFS D'AFFICHAGE TRIDIMENSIONNEL (3D)


(84)Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

(30)Priority: 22.06.2016 US 201662353325 P
30.09.2016 US 201662402296 P

(43)Date of publication of application:
01.05.2019 Bulletin 2019/18

(73)Proprietor: Dolby Laboratories Licensing Corporation
San Francisco, CA 94103 (US)

(72)Inventors:
  • RICHARDS, Martin J.
    San Francisco, California 94103 (US)
  • DAVIES, Trevor
    San Francisco, California 94103 (US)
  • PENNA, Ashley
    San Francisco, California 94103 (US)

(74)Representative: Dolby International AB Patent Group Europe 
Apollo Building, 3E Herikerbergweg 1-35
1101 CN Amsterdam Zuidoost
1101 CN Amsterdam Zuidoost (NL)


(56)References cited: : 
US-A1- 2007 247 402
  
  • ISAAC KAUVAR ET AL: "Adaptive color display via perceptually-driven factored spectral projection", ACM TRANSACTIONS ON GRAPHICS (TOG), ACM, US, vol. 34, no. 6, 26 October 2015 (2015-10-26), pages 1-10, XP058075310, ISSN: 0730-0301, DOI: 10.1145/2816795.2818070
  • S Roth ET AL: "0.2: Wide Gamut, High Brightness Multiple Primaries Single Panel Projection Displays", SID Symposium Digest of Technical Papers 34, 1 May 2003 (2003-05-01), pages 118-121, XP055200264, DOI: 10.1889/1.1832219 Retrieved from the Internet: URL:http://fp.optics.arizona.edu/opti588/P resentation/EnrichedColorDisplay/Roth_SID0 3_WideGamutMultiPrimaryProjectionDisplay.p df [retrieved on 2015-07-06]
  • Jan Fröhlich ET AL: "The SMPTE Meeting Presentation Gamut Mapping for Digital Cinema Written for presentation at the", , 31 October 2013 (2013-10-31), XP055406263, Retrieved from the Internet: URL:http://ieeexplore.ieee.org/ielx7/72693 93/7269394/07269395.pdf [retrieved on 2017-09-13]
  
Note: Within nine months from the publication of the mention of the grant of the European patent, any person may give notice to the European Patent Office of opposition to the European patent granted. Notice of opposition shall be filed in a written reasoned statement. It shall not be deemed to have been filed until the opposition fee has been paid. (Art. 99(1) European Patent Convention).


Description

BACKGROUND


Technical Field



[0001] This invention relates generally to devices and displays for displaying image data, and more particularly to the display of 2D images on 3D capable displays.

Description of the Background Art



[0002] Displays exist that are capable of displaying three-dimensional (3D) images. For example, such displays display a left eye image and a right eye image, which, when viewed together, give the appearance of a 3D image. The left eye image can be produced using 3 primary-color light sources (e.g., red1, green1, and blue1), and the right eye image can be produced using 3 different primary-color light sources (e.g., red2, green2, and blue2), each having a slightly different wavelength than their counterpart of similar color. The viewer views the displayed images through eyewear that includes a left lens and a different right lens. The left lens passes the left eye image and blocks the right eye image, and the right lens passes the right eye image and blocks the left eye image.

[0003] Conventional two-dimensional images can be displayed by 3D displays, by driving each pair of primary light sources with the same data. For example, the 2D red data values are used to drive both the red1 and the red2 primaries. Similarly, the 2D green data values are used to drive both the green1 and the green2 primaries, and the 2D blue data values are used to drive both the blue1 and blue2 primaries. The system is calibrated with the effective combined primaries and accurate images can be produced. However, the resulting color gamut can be limited significantly with respect to a desired color gamut (e.g., the established Rec 2020 gamut). I. Kauvar et al., "Adaptive Color Display via Perceptually-driven Factored Spectral Projection", in ACM Transactions on Graphics, Vol. 34, No. 6, Article 165 and S. Roth et al., "10.2: Wide Gamut, High Brightness Multiple Primaries Single Panel Projection Displays", in SID 03 Digest disclose mapping of three primary input data into a virtual multi-primary (six, for example) gamut for a multi-primary projection device.

SUMMARY



[0004] The present invention overcomes the problems associated with the prior art by providing an improved means for displaying two-dimensional (2D) video data on a three-dimension (3D) display.

[0005] An example method for displaying image data includes identifying an established color gamut defined by a predefined number of primary colors and identifying a number of primary display colors associated with a light source, wherein the number of primary display colors associated with the light source exceeds the number of primary colors defining the established color gamut. The example method further includes defining a first virtual color gamut based on a combination of the primary display colors associated with the light source to approximate the established color gamut. Video data is received, which includes intensity values corresponding to a number of colors (e.g., 3) fewer than the number of primary colors associated with the light source (e.g., 6). The example method further includes generating intensity values associated with the first virtual color gamut based on the video data, and generating intensity values associated with the primary display colors of the light source based on the generated intensity values associated with the first virtual color gamut. The intensity values associated with the primary display colors are then provided to a spatial light modulator.

[0006] A particular example method further includes defining a second virtual color gamut, generating intensity values associated with the second virtual color gamut based on the video data, and using the intensity values associated with the second virtual color gamut in the step of generating the intensity values associated with the primary display colors. The second virtual color gamut is defined based on residual power of the light source after defining the first virtual color gamut. In a particular example method, the video data has a format associated with the established color gamut.

[0007] In a particular example method, the number of primary display colors is twice as large as the number of colors corresponding to the intensity values of the video data. In a more particular example method, the number of primary display colors is 6 and the video data includes intensity values corresponding to no more than 3 colors.

[0008] In an example method, at least one of the steps of generating intensity values associated with the first virtual color gamut based on the video data and generating intensity values associated with the second virtual color gamut based on the video data includes determining an intensity level indicated by the video data (e.g., a separate intensity level for each color associated with the video data) and generating the intensity values associated with at least one of the first virtual color gamut and the second virtual color gamut based on the intensity level indicated by the video data. The method additionally includes determining whether the intensity level indicated by the video data exceeds a predetermined intensity level (e.g., a separate predetermined intensity level for each color associated with the video data). If the intensity level indicated by the video data does not exceed the predetermined intensity level, then the intensity values associated with the first virtual gamut are generated based on the video data and the intensity values associated with the second virtual gamut are set to zero. On the other hand, if the intensity level indicated by the video data does exceed the predetermined intensity level, then an intensity value associated with the first virtual gamut is generated based on the predetermined intensity level, and intensity value associated with the second virtual gamut is generated based on an amount that the intensity level indicated by the video data exceeds the predetermined intensity level.

[0009] In one example method, the second virtual gamut is scaled to fit intensity values of the video data within an achievable gamut volume of the light source. The scaling is achieved, for example, by compressing the second virtual gamut toward white.

[0010] Another method includes clipping intensity values of at least one of the first virtual gamut and the second virtual gamut to fit within the achievable gamut volume of the light source. Optionally, the intensity values of at least one of the first virtual gamut and the second virtual gamut are clipped toward white. As another option, the intensity values of at least one of the first virtual gamut and the second virtual gamut are clipped to the edge of the achievable gamut volume in the direction of the negative primary.

[0011] Another example method includes modeling an achievable gamut volume of the first virtual gamut and the second virtual gamut and determining whether the generated intensity values of the first virtual gamut and the second virtual gamut fit within the modeled gamut volume. Intensity values of the first virtual gamut and the second virtual gamut that fit within the modeled gamut volume are left unmodified. Intensity values of the first virtual gamut and the second virtual gamut that do not fit within the modeled gamut volume are modified to fit within the modeled gamut volume. One example method of modifying the intensity values of the first virtual gamut and the second virtual gamut includes preserving the color balance (chromaticity) of the modified intensity values and reducing the intensity (e.g., magnitude) of the modified intensity values to fit within the achievable gamut volume. Another example method of modifying the intensity values of the first virtual gamut and the second virtual gamut includes preserving the intensity (e.g., magnitude) of the modified intensity values and adjusting the chromaticity of the modified intensity values towards a white point to fit within the achievable gamut volume. Yet another example method of modifying the intensity values of the first virtual gamut and the second virtual gamut includes reducing the intensity (e.g., magnitude) of the modified intensity values and adjusting the chromaticity of the modified intensity values towards a white point, whereby the intensity values are adjusted toward a surface of the achievable gamut volume.

[0012] An example display includes a light source, a spatial light modulator, and a controller. The light source includes a number of primary display colors (e.g., 6), which exceeds a number of primary colors (e.g., 3) defining an established color gamut. The spatial light modulator is illuminated by the light source. The controller is operative to receive video data including intensity values associated with a number of colors less than the number of primary display colors. The controller can be configured to receive video data having a format associated with the established color gamut. The controller generates intensity values associated with a first virtual color gamut based on the video data. The first virtual color gamut is defined by a combination of the primary display colors to match the established color gamut. The controller also generates intensity values for each of the primary display colors based on the intensity values associated with the first virtual gamut, and provides the intensity values for each of the primary display colors to the spatial light modulator.

[0013] In an example display, the controller is further operative to generate intensity values associated with a second virtual color gamut based on the video data. The second virtual color gamut is defined based on residual power of the light source considering the first virtual color gamut. The controller is further operative to generate intensity values associated with the second virtual color gamut based on the video data, and use the intensity values associated with the second virtual color gamut to generate the intensity values associated with the primary display colors.

[0014] In a particular embodiment, the number of primary display colors is twice as large as the number of colors corresponding to the intensity values of the video data. In a more particular embodiment, the number of primary display colors is 6 and the video intensity values correspond to no more than 3 colors.

[0015] In an example display, the controller is further operative to determine an intensity level indicated by the video data, and generate the intensity values associated with at least one of the first virtual color gamut and the second virtual color gamut based on the intensity level indicated by the video data. In one embodiment, the controller determines whether the intensity level indicated by the video data exceeds a predetermined intensity level. If the intensity level indicated by the video data does not exceed the predetermined intensity level, then the controller generates the intensity values associated with the first virtual gamut based on the video data and sets the intensity values associated with the second virtual gamut to zero. If the intensity level indicated by the video data does exceed the predetermined intensity level, then the controller generates an intensity value associated with the first virtual gamut based on the predetermined intensity level, and generates an intensity value associated with the second virtual gamut based on an amount by which the intensity level indicated by the video data exceeds the predetermined intensity level.

[0016] Optionally, the controller is operative to scale the second virtual gamut to fit intensity values of the video data within an achievable gamut volume of the light source. The scaling can include compressing the second virtual gamut toward white. As another option, the controller is operative to clip intensity values of at least one of the first virtual gamut and the second virtual gamut to fit within the achievable gamut volume of the light source. The intensity values of at least one of the first virtual gamut and the second virtual gamut can be clipped toward white, or the intensity values of at least one of the first virtual gamut and the second virtual gamut can be clipped to the edge of the achievable gamut volume.

[0017] Another example display incudes a modeler, a comparator, and a modifier. The modeler is operative to model an achievable gamut volume of the first virtual gamut and the second virtual gamut, in view of the light source capabilities. The comparator determines whether the generated intensity values of the first virtual gamut and the second virtual gamut fit within the modeled gamut volume. The modifier leaves the intensity values of the first virtual gamut and the second virtual gamut that fit within the modeled gamut volume unmodified, but modifies intensity values of the first virtual gamut and the second virtual gamut that do not fit within the modeled gamut volume, so that the modified values will fit within the modeled gamut volume. In a particular example display, the modifier is operative to preserve the color balance of the modified intensity values and reduce the intensity (e.g., magnitude) of the intensity values to fit within the achievable gamut volume. In another particular example display, the modifier is operative to preserve the intensity (e.g., magnitude) of the modified intensity values and adjust the chromaticity of the modified intensity values towards a white point to fit within the achievable gamut volume. In yet another particular example display, the modifier is operative to reduce the intensity (e.g., magnitude) of the modified intensity values and adjust chromaticity of the modified intensity values towards a white point, whereby the intensity values are adjusted toward a surface of the achievable gamut volume.

[0018] Any of the methods disclosed herein can be implemented with a non-transitory, electronically-readable medium having code embodied therein for causing a display device to perform the methods.

BRIEF DESCRIPTION OF THE DRAWINGS



[0019] The present invention is described with reference to the following drawings, wherein like reference numbers denote substantially similar elements:

FIG. 1 is a block diagram of an example 3D display system;

FIG. 2 is a block diagram of the controller of the 3D display system of FIG. 1;

FIG. 3 is a chromaticity chart showing color gamuts associated with multiple display primary light sources;

FIG. 4 is a chromaticity chart showing virtual color gamuts associated with multiple display primary light sources;

FIG. 5 is a flow chart summarizing an example method of displaying 2D images on a 3D display;

FIG. 6A is a flow chart summarizing an example method of performing a step of converting video data to first and second virtual color gamut values;

FIG. 6B is a flow chart summarizing another example method of performing a step of converting video data to first and second virtual color gamut values; and

FIG. 6C is a flow chart summarizing yet another example method of performing a step of converting video data to first and second virtual color gamut values.


DETAILED DESCRIPTION



[0020] The present invention overcomes the problems associated with the prior art, by providing a display system and display for displaying video data defining a first number of primary colors using an illumination source defining a second, greater number of primary light source colors. In the following description, numerous specific details are set forth (e.g., projector environment) in order to provide a thorough understanding of the invention. Those skilled in the art will recognize, however, that the invention may be practiced apart from these specific details. In other instances, details of well-known video processing practices and components have been omitted, so as not to unnecessarily obscure the present invention.

[0021] FIG. 1 is a block diagram of an example 3D display system 100 capable of displaying 2D video data with an improved color gamut. In this example embodiment, display system 100 is a projector including a light source 102 with 6 primary colors (e.g., laser light sources), illumination optics 104, a separator 106, one or more modulators 108, a combiner 110, projection optics 112, and a controller 114. Light source 102 produces an illumination beam including the six primary colors and directs the illumination beam through illumination optics 104 and into color separator 106. Color separator 106 separates the one of spatial light modulators 108. After the primary illumination beams are modulated, projection optics 112 focuses the modulated beam to form an imaging beam, which is projected onto a viewing surface (not shown).

[0022] In this example embodiment, there is an individual modulator for each primary color. However, the number of modulators can be reduced using a field sequential modulation scheme. In another example embodiment, the light sources, the modulators, and other components of the projector can be separated into two separate, but coordinated projectors. In yet another embodiment, the modulators can include a plurality of modulators for each primary color, as, for example, in a dual modulation projector.

[0023] FIG. 2 is a block diagram of an example controller 114 of the 3D display system of FIG. 1. Controller 114 includes an Identification of Primaries Module for receiving and/or storing information (e.g., calibration data) about the primary colors of light source 102. A Color Space Transformation module 204 transforms incoming 2D video data into an established tri-stimulus color space (e.g., Rec2020), if necessary. A Gamut Redefinition module 206 defines one or more virtual gamuts based on the target established color gamut and the primaries of light source 102. An Established Tri-Stimulus To Virtual Gamut Transformation module 208 converts video data into intensity values associated with the virtual gamut(s). Then, a Virtual Gamuts To Primaries Transformation module 210 converts the intensity values of the virtual gamut(s) into intensity values corresponding to the primaries of the light source and provides the resulting intensity values to the modulators.

[0024] FIG. 3 is a CIE 1931 chromaticity chart showing color gamuts associated with the multiple display primary light sources and the target established color gamut (Rec2020). Gamut 302 is the Rec2020 gamut. Gamut 304 is the gamut defined by the first 3 light source primaries (RL, GL, and BL), which provide illumination for a right eye image when the projector is operating in 3D mode. Gamut 306 is the gamut defined by the second 3 light source primaries (RS, GS, and BS), which provide illumination for a left eye image when the projector is operating in 3D mode. Gamut 308 is the gamut defined by driving the left eye primaries and the right eye primaries with the same values. As shown, gamut 308 significantly differs from Rec2020 gamut 302.

[0025] FIG. 4 is a chromaticity chart showing virtual color gamuts generated from the multiple display primary light sources. Gamuts 302, 306, and 304 of FIG. 3 are also shown for comparison. Virtual gamut 402 (Gamut A), is defined as a combination of the 6 primary light sources to closely approximate Rec2020 gamut 302. Virtual gamut 404 (Gamut B) is defined by the residual power of the 6 primary light sources. In other words, Gamut B is has been subtracted. As shown, virtual gamut 402 (Gamut A) matches the Rec2020 gamut 302 much more closely than the simple summation gamut 308 (FIG. 3).

[0026] The disclosed system optimizes the gamut volume for 2D images by driving the left and right eye signals differently (even though the content is only 2D and no glasses are worn). The gamut volume is divided into the two virtual gamuts: Gamut A and Gamut B. Each gamut uses virtual primaries that are specific blends of the original 6P primaries. The 'A' gamut is optimized to be as close to possible as Rec2020. The 'B' gamut uses the residual energy from the 6 primaries. The 'A' and 'B' gamuts are show in FIG. 4. Note that the 'A' gamut is very close to Rec2020.

[0027] Values in the 'A' and 'B' gamuts can be converted to the 6P primaries (RL, GL, BL, RS, GS, BS) using "blend" matrices as follows:



[0028] Typical values for the blend matrices [BAL] [BAS], [BBL], and [BBS] are:



[0029] The 'A' gamut is used for lower luminance levels and the 'B' gamut is added, where necessary, to achieve higher luminance levels. The 'A' gamut services approximately 50% of the luminance range, above which the less-favorable 'B' gamut is added. 50% of the linear luminance range represents all but the last stop of the perceptual range and, therefore, most of perceptual range can be handled with the 'A' gamut. Above that range the 'B' gamut is added and the gamut volume tapers towards the top. Hence, the vast majority of the perceptual range can be achieved with approximately Rec2020 gamut, and yet the full luminance range can still be achieved.

[0030] Although the 'B' gamut can represent chromaticities that are outside the 'A' gamut, it would be counter-intuitive for a colorist to utilize chromaticities that are only available at higher luminance values. Therefore the 'B' gamut would be limited to the intersection of the achievable 'B' gamut and the 'A' gamut.

[0031] There is a desire in the industry not to utilize colors outside the Rec2020 gamut. This is easily achieved by representing the source images in RGB with Rec2020 primaries and disallowing negative values. Content color-graded this way will never produce values outside Rec2020. When the content is packaged for distribution, it is transformed into a DCI-compliant package represented by CIE 1931 XYZ tri-stimulus values. Although XYZ can represent colors outside Rec2020, so long as the source was constrained to Rec2020, excursions in XYZ will never exceed Rec2020.

[0032] The methods in this disclosure cover various means for implementing this. The first two methods are computationally efficient and could easily be implemented in a simple filed-programmable gate array (FPGA) circuit. The third method is more computationally intensive and would typically be implemented in a graphics processor unit (GPU).

Method 1 - Gamut scaling



[0033] In this method two functions are defined:



CR2020, G2020, B2020

[0034] For all incoming tri-stimulus pixel values (denoted R2020), the 'A' and 'B' gamut signals are derived as follows:

and



[0035] The signals representing the 'A' gamut (RA, GA, BA) and the signals representing the 'B' gamut (RB, GB, BB) then drive the 6P primaries according to the blend matrixes [BAL], [BAS], [BBL], and [BBS] described above.

[0036] In this method, for luminance values above 50%, all RGB values are moved towards white to fit within the available gamut volume.

Method 2 - Gamut clipping



[0037] In this method two functions are defined:



CR2020, G2020, B2020

[0038] For all incoming tri-stimulus pixel values (denoted R2020), the full unclipped 'A' and 'B' gamut signals are derived as follows:

and

where [C]A and [C]B are derived as will be described hereinafter.

[0039] These are then clipped as follows:





[0040] In this method, values within the achievable gamut volume are left untouched and values outside (with negative RGB values) are clipped to the edge of the gamut in the direction of the negative primary.

[0041] An alternative method instead clips towards white:

minA = min(RAf, GAf, BAf);

if(minA < 0) then

minB = min(RBf, GBf, BBf);

if (minB < 0) then

Again, the signals representing the 'A' gamut (RA, GA, BA) and the signals representing the 'B' gamut (RB, GB, BB) then drive the 6P primaries according to the blend matrices described above.

[0042] [C]A and [C]B used above to convert tri-stimulus values to full, unclipped A and B gamut values are derived as follows. As indicated above, two sets of three primaries of the virtual A and B gamuts {RA, GA, BA} and {RB, GB, BB} are related to the long and short primaries of the display {RL, GL, BL} and {RS, GS, BS} according to the following blend matrices:

and



[0043] Knowing the Normalized Primary Matrixes for {RL, GL, BL} and {RS, GS, BS}, the XYZ value for arbitrary points in {RL, GL, BL} and {RS, GS, BS} is:



[0044] Substituting [1], [2]:







[0045] Putting in terms of primary matrices (Note [PM]A and [PM]B are not normalized primary matrices. Although the middle row of [NPM]LLL and [NPM]SSS each sum to 1, [PM]A,B take arbitrary blends of each column so the resulting middle row no longer sums to 1.):

where:



[0046] Similarly:



[0047] Given the normalized primary matrix for Rec2020
[NPM]2020,
then:

and


Method 3 - Gamut volume modelling



[0048] In this method, the gamut volume achievable by utilizing the 'A' gamut for low luminance values and the 'B' gamut for higher luminance values, is modeled such that tri-stimulus values can be tested to determine whether they fall within the achievable gamut volume or not.

[0049] In one method, tri-stimulus values within the achievable gamut volume are unmodified. For values outside the gamut volume, the ratio of RGB values is preserved but the values are scaled to reduce luminance to fit within the available gamut volume.

[0050] In an alternative method, again the values within the achievable gamut volume are unmodified. For values outside the gamut volume, the luminance is preserved, but chromaticity is moved towards the mastering white point (e.g. D6500) to fit within the gamut volume.

[0051] In another method, tri-stimulus values within some threshold of the surface of the gamut volume would be dropped in luminance or moved towards the white point to achieve a "soft clip" to the surface of the gamut volume. This may reduce artifacts in cases where high luminance saturated colors are utilized heavily.

Flowcharts Summarizing Example Methods



[0052] FIG. 5 is a flow chart summarizing an example method 500 of displaying 2D images on a 3D display. In a first step 502, an established color gamut defined by a number (e.g., 3) primary colors is identified. Then, in a second step 504 a different number (e.g., 6) of primary display colors associated with a light source are identified. Next, in a third step 506, a first virtual gamut is defined based on a combination of the identified primary display colors to closely approximate the identified established gamut. In a fourth step 508, a second virtual gamut is defined based on the residual light source power for the primary display colors. Then, in a fifth step 510, video data is converted to intensity values of the first and second virtual gamuts. Next, in a sixth step 512, the intensity values of the first and second virtual gamuts are converted to intensity values associated with the primary display colors. Then, in a seventh step 514, the intensity values associated with the primary display colors are provided to one or more spatial light modulators.

[0053] FIG. 6A is a flow chart summarizing an example method 600 of performing a step of converting video data to intensity values associated with the first and second virtual color gamuts. In a first step 602, a luminance level (L) at or below which colors can be represented by the first virtual color gamut alone is defined. Then, in a second step 604, the luminance level of video data is determined. Next, in a third step 606, it is determined whether the luminance level of the video data is at or below the defined luminance level (L). If it is determined that the luminance level of the video data is at or below the defined luminance level (L), then, in a fourth step 608, intensity values associated with the first virtual gamut are generated from the video data, and the intensity values associated with the second virtual gamut are set to zero.

[0054] If, in third step 606 it is determined that the luminance level of the video data is above the defined luminance level (L), then, in a fifth step 610, intensity values associated with the first virtual gamut are generated corresponding to the luminance level (L). Next, in a sixth step 612, the second gamut is scaled to be within an achievable gamut volume of the light source. Then, in a seventh step 614, intensity levels associated with the second virtual gamut are generated corresponding to an amount that the luminance level of the video data exceeds the defined luminance level (L).

[0055] FIG. 6B is a flow chart summarizing another example method 620 of performing a step of converting video data to intensity values associated with the first and second virtual color gamuts. In a first step 622, a luminance level (L) at or below which colors can be represented solely by the first virtual color gamut is defined. Then, in a second step 624, the luminance level of video data is determined. Next, in a third step 626, it is determined whether the luminance level of the video data is at or below the defined luminance level (L). If it is determined that the luminance level of the video data is at or below the defined luminance level (L), then, in a fourth step 628, intensity values associated with the first virtual color gamut are generated from the video data, and the intensity values associated with the second virtual color gamut are set to zero.

[0056] If, in third step 626 it is determined that the luminance level of the video data is above the defined luminance level (L), then, in a fifth step 630, intensity values associated with the first virtual gamut are generated corresponding to the luminance level (L). Next, in a sixth step 632, intensity levels associated with the second virtual gamut are generated corresponding to an amount that the luminance level of the video data exceeds the defined luminance level (L). Then, in a seventh step 634, the intensity values associated with the first and second virtual gamuts are clipped to be within the achievable gamut volume.

[0057] FIG. 6C is a flow chart summarizing yet another example method 640 of performing a step of converting video data to first and second virtual color gamut values. In a first step 642, an achievable gamut volume of the light source is modeled using the first virtual gamut for luminance values at or below a predetermined luminance level (L). Then, in a second step 644, video data is converted to intensity values associated with the first and second virtual color gamuts. Next, in a third step 646, it is determined whether the intensity values associated with the first and second virtual color gamuts fit within the modeled gamut volume. It the intensity values associated with the first and second virtual color gamuts do fit within the modeled gamut volume, method 640 ends. Otherwise, the intensity values associated with the first and second virtual color gamuts are modified according to one of the following optional steps. In an optional fourth step 648, the luminance of the intensity values associated with the first and second virtual color gamuts is reduced, while preserving the primary color balance of the data, until the intensity values fit within the modeled gamut volume. In an optional fifth step 650, the luminance of the intensity values associated with the first and second virtual color gamuts is preserved, but chromaticity is adjusted towards a white point until the intensity values fit within the modeled gamut volume. In an optional sixth step 652, the luminance of the intensity values associated with the first and second virtual color gamuts is reduced and the chromaticity is adjusted toward the white point until the intensity values associated with the first and second virtual color gamuts fit within the modeled gamut volume, thus achieving a "soft clip" to the surface of the gamut volume.

[0058] The description of particular embodiments of the present invention is now complete. Many of the described features may be substituted, altered or omitted without departing from the scope of the invention. For example, the example embodiment is a shown as a projector. However, the inventive methods and components can be employed in a color grading desk. As another option, the methods and components of this disclosure can be embodied in an intermediate device interposed between a color grading desk and a projector or other display. This and other deviations from the particular embodiments shown will be apparent to those skilled in the art, particularly in view of the foregoing disclosure.


Claims

1. A method for displaying image data, said method comprising:

receiving an established color gamut defined by a predefined number of primary colors;

receiving a number of primary display colors associated with a light source, said number of primary display colors associated with said light source exceeding said number of primary colors defining said established color gamut;

receiving a first virtual color gamut based on a combination of said primary display colors associated with said light source to approximate said established color gamut;

receiving video data including intensity values corresponding to a number of colors fewer than said number of primary colors associated with said light source;

generating intensity values associated with said first virtual color gamut based on said video data;

receiving a second virtual color gamut based on residual power of said light source considering said first virtual color gamut;

generating intensity values associated with said second virtual color gamut based on said video data;

receiving first and second blend matrices for calculating a weighted combination of said intensity values associated with said first and second virtual color gamuts;

generating intensity values associated with said primary display colors of said light source by calculating a weighted combination of said intensity values associated with said first and second virtual color gamuts, wherein said weighted combination is calculated by applying said first blend matrix to said intensity values associated with said first virtual gamut and applying said second blend matrix to said intensity values associated with said second virtual gamut and adding the results; and

providing said intensity values associated with said primary display colors to a spatial light modulator.


 
2. The method of Claim 1, wherein said number of primary display colors is twice as large as said number of colors corresponding to said intensity values of said video data.
 
3. The method of Claim 2, wherein said number of primary display colors is 6 and said video intensity values corresponding to no more than 3 colors.
 
4. The method of any of Claims 1-3, wherein at least one of said steps of generating intensity values associated with said first virtual color gamut based on said video data and generating intensity values associated with said second virtual color gamut based on said video data includes:

determining an intensity level indicated by said video data; and

generating said intensity values associated with at least one of said first virtual color gamut and said second virtual color gamut based on said intensity level indicated by said video data.


 
5. The method of Claim 4, wherein generating said intensity values associated with at least one of said first virtual color gamut and said second virtual color gamut based on said intensity level indicated by said video data includes:

determining whether said intensity level indicated by said video data exceeds a predetermined intensity level; and

if said intensity level indicated by said video data does not exceed said predetermined intensity level, then generating said intensity values associated with said first virtual gamut based on said video data and setting said intensity values associated with said second virtual gamut to zero.


 
6. The method of Claim 5, wherein:

said step of determining an intensity level indicated by said video data includes determining a separate intensity level for each color of said number of colors represented by said video data; and

said step of determining whether said intensity level indicated by said video data exceeds a predetermined intensity level includes determining whether each of said separate intensity levels for each color exceeds a predetermined intensity level.


 
7. The method of Claim 5 or Claim 6, wherein, if said intensity level indicated by said video data does exceed said predetermined intensity level, then:

generating an intensity value associated with said first virtual gamut based on said predetermined intensity level; and

generating an intensity value associated with said second virtual gamut based on an amount said intensity level indicated by said video data exceeds said predetermined intensity level.


 
8. The method of any of Claims 1-7, wherein the second virtual gamut is scaled to fit intensity values of said video data within an achievable gamut volume of the light source; or: wherein the second virtual gamut is scaled to fit intensity values of said video data within an achievable gamut volume of the light source, and wherein the scaling comprises compressing the second virtual gamut toward white.
 
9. The method of any of Claims 1-8, further comprising clipping intensity values of at least one of said first virtual gamut and said second virtual gamut to fit within an achievable gamut volume of the light source.
 
10. The method of Claim 9, wherein intensity values of at least one of said first virtual gamut and said second virtual gamut are clipped toward white; or:
wherein intensity values of at least one of said first virtual gamut and said second virtual gamut are clipped to the edge of said achievable gamut volume.
 
11. The method of any of Claims 1-10, further comprising:

modeling an achievable gamut volume of said first virtual gamut and said second virtual gamut;

determining whether said generated intensity values of said first virtual gamut and said second virtual gamut fit within said modeled gamut volume;

leaving said intensity values of said first virtual gamut and said second virtual gamut that fit within said modeled gamut volume unmodified; and

modifying intensity values of said first virtual gamut and said second virtual gamut that do not fit within said modeled gamut volume.


 
12. An electronically-readable medium having code embodied therein for causing a controller for a display device to perform the method of any of Claims 1-11.
 
13. A controller for a display device,
the display device including a light source having a number of primary display colors,
said number of primary display colors exceeding a number of primary colors defining an established color gamut, the display device further including a spatial light modulator illuminated by said light source,
the controller operative to:

receive video data including intensity values associated with a number of colors less than said number of primary display colors;

generate intensity values associated with a first virtual color gamut based on said video data, said first virtual color gamut defined by a combination of said primary display colors to match said established color gamut;

generate intensity values associated with a second virtual color gamut based on said video data, said second virtual color gamut defined based on residual power of said light source considering said first virtual color gamut;

generate intensity values associated with said second virtual color gamut based on said video data;

generate intensity values for each of said primary display colors by calculating a weighted combination of said intensity values associated with said first and second virtual gamuts, wherein said weighted combination is calculated by applying a first blend matrix to said intensity values associated with said first virtual gamut and applying a second blend matrix to said intensity values associated with said second virtual gamut and adding the results; and

provide said intensity values for each of said primary display colors to said spatial light modulator.


 
14. The controller of Claim 13, further configured to perform the method of any of Claims 2-11.
 
15. A display device including:

a light source having a number of primary display colors, said number of primary display colors exceeding a number of primary colors defining an established color gamut;

a spatial light modulator illuminated by said light source; and

the controller of Claim 13 or Claim 14.


 


Ansprüche

1. Verfahren zum Anzeigen von Bilddaten, wobei das Verfahren umfasst:

Empfangen eines festgelegten Farbgamuts, der durch eine vordefinierte Anzahl von Primärfarben definiert ist;

Empfangen einer Anzahl von primären Anzeigefarben, die mit einer Lichtquelle verknüpft sind, wobei die Anzahl von primären Anzeigefarben, die mit der Lichtquelle verknüpft sind, die Anzahl von Primärfarben, die den festgelegten Farbgamut definieren, übersteigt;

Empfangen eines ersten virtuellen Farbgamuts, der auf einer Kombination der mit der Lichtquelle verknüpften primären Anzeigefarben basiert, um den festgelegten Farbgamut zu approximieren;

Empfangen von Videodaten, einschließlich Intensitätswerten, die einer Anzahl von Farben entsprechen, welche kleiner ist als die Anzahl von Primärfarben, die mit der Lichtquelle verknüpft sind;

Erzeugen von Intensitätswerten, die mit dem ersten virtuellen Farbgamut verknüpft sind, auf Basis der Videodaten;

Empfangen eines zweiten virtuellen Farbgamuts, der auf Restleistung der Lichtquelle unter Berücksichtigung des ersten virtuellen Farbgamuts basiert;

Erzeugen von Intensitätswerten, die mit dem zweiten virtuellen Farbgamut verknüpft sind, auf Basis der Videodaten;

Empfangen von ersten und zweiten Mischmatrizen, um eine gewichtete Kombination der Intensitätswerte, die mit dem ersten und zweiten virtuellen Farbgamut verknüpft sind, zu berechnen;

Erzeugen von Intensitätswerten, die mit den primären Anzeigefarben der Lichtquelle verknüpft sind, durch Berechnen einer gewichteten Kombination der Intensitätswerte, die mit dem ersten und zweiten virtuellen Farbgamut verknüpft sind, wobei die gewichtete Kombination durch Anwenden der ersten Mischmatrix auf die Intensitätswerte, die mit dem ersten virtuellen Gamut verknüpft sind, und Anwenden der zweiten Mischmatrix auf die Intensitätswerte, die mit dem zweiten virtuellen Gamut verknüpft sind, und Addieren der Ergebnisse berechnet wird; und

Bereitstellen der Intensitätswerte, die mit den primären Anzeigefarben verknüpft sind, an einen räumlichen Lichtmodulator.


 
2. Verfahren nach Anspruch 1, wobei die Anzahl von primären Anzeigefarben doppelt so groß ist wie die Anzahl von Farben, die den Intensitätswerten der Videodaten entsprechen.
 
3. Verfahren nach Anspruch 2, wobei die Anzahl von primären Anzeigefarben 6 beträgt und die Videointensitätswerte nicht mehr als 3 Farben entsprechen.
 
4. Verfahren nach einem der Ansprüche 1-3, wobei mindestens einer der Schritte des Erzeugens von Intensitätswerten, die mit dem ersten virtuellen Farbgamut verknüpft sind, auf Basis der Videodaten, und des Erzeugens von Intensitätswerten, die mit dem zweiten virtuellen Farbgamut verknüpft sind, auf Basis der Videodaten einschließt:

Bestimmen einer Intensitätsstufe, die von den Videodaten angegeben wird; und

Erzeugen der Intensitätswerte, die mit mindestens einem aus dem ersten virtuellen Farbgamut und dem zweiten virtuellen Farbgamut verknüpft sind, auf Basis der von den Videodaten angegebenen Intensitätsstufe.


 
5. Verfahren nach Anspruch 4, wobei das Erzeugen der Intensitätswerte, die mit mindestens einem aus dem ersten virtuellen Farbgamut und dem zweiten virtuellen Farbgamut verknüpft sind, auf Basis der von den Videodaten angegebenen Intensitätsstufe einschließt:

Bestimmen, ob die von den Videodaten angegebene Intensitätsstufe eine vorbestimmte Intensitätsstufe übersteigt; und

wenn die von den Videodaten angegebene Intensitätsstufe die vorbestimmte Intensitätsstufe nicht übersteigt, dann Erzeugen der Intensitätswerte, die mit dem ersten virtuellen Gamut verknüpft sind, auf Basis der Videodaten, und Einstellen der Intensitätswerte, die mit dem zweiten virtuellen Gamut verknüpft sind, auf null.


 
6. Verfahren nach Anspruch 5, wobei:

der Schritt des Bestimmens einer Intensitätsstufe, die von den Videodaten angegeben wird, das Bestimmen einer separaten Intensitätsstufe für jede Farbe aus der Anzahl von Farben einschließt, die von den Videodaten dargestellt werden; und

der Schritt des Bestimmens, ob die von den Videodaten angegebene Intensitätsstufe eine vorbestimmte Intensitätsstufe übersteigt, das Bestimmen einschließt, ob jede der separaten Intensitätsstufen für jede Farbe eine vorbestimmte Intensitätsstufe übersteigt.


 
7. Verfahren nach Anspruch 5 oder Anspruch 6, wobei, wenn die von den Videodaten angegebene Intensitätsstufe die vorbestimmte Intensitätsstufe übersteigt, dann:

Erzeugen eines Intensitätswerts, der mit dem ersten virtuellen Gamut verknüpft ist, auf Basis der vorbestimmten Intensitätsstufe; und

Erzeugen eines Intensitätswerts, der mit dem zweiten virtuellen Gamut verknüpft ist, auf Basis eines Betrags, um den die von den Videodaten angegebene Intensitätsstufe die vorbestimmte Intensitätsstufe übersteigt.


 
8. Verfahren nach einem der Ansprüche 1-7, wobei der zweite virtuelle Gamut so skaliert wird, dass er zu Intensitätswerten der Videodaten innerhalb eines erreichbaren Gamutvolumens der Lichtquelle passt; oder:
wobei der zweite virtuelle Gamut so skaliert wird, dass er zu Intensitätswerten der Videodaten innerhalb eines erreichbaren Gamutvolumens der Lichtquelle passt, und wobei das Skalieren das Komprimieren des zweiten virtuellen Gamuts in Richtung Weiß umfasst.
 
9. Verfahren nach einem der Ansprüche 1-8, weiter das Beschneiden von Intensitätswerten von mindestens einem aus dem ersten virtuellen Gamut und dem zweiten virtuellen Gamut so umfassend, dass sie in ein erreichbares Gamutvolumen der Lichtquelle passen.
 
10. Verfahren nach Anspruch 9, wobei Intensitätswerte von mindestens einem aus dem ersten virtuellen Gamut und dem zweiten virtuellen Gamut in Richtung Weiß beschnitten werden; oder:
wobei Intensitätswerte von mindestens einem aus dem ersten virtuellen Gamut und dem zweiten virtuellen Gamut auf den Rand des erreichbaren Gamutvolumens beschnitten werden.
 
11. Verfahren nach einem der Ansprüche 1-10, weiter umfassend:

Modellieren eines erreichbaren Gamutvolumens des ersten virtuellen Gamuts und des zweiten virtuellen Gamuts;

Bestimmen, ob die erzeugten Intensitätswerte des ersten virtuellen Gamuts und des zweiten virtuellen Gamuts in das modellierte Gamutvolumen passen;

Unverändertlassen der Intensitätswerte des ersten virtuellen Gamuts und des zweiten virtuellen Gamuts, die in das modellierte Gamutvolumen passen; und

Verändern von Intensitätswerten des ersten virtuellen Gamuts und des zweiten virtuellen Gamuts, die nicht in das modellierte Gamutvolumen passen.


 
12. Elektronisch lesbares Medium, auf dem Code ausgebildet ist, um eine Steuerung für eine Anzeigevorrichtung dazu zu bringen, das Verfahren nach einem der Ansprüche 1-11 durchzuführen.
 
13. Steuerung für eine Anzeigevorrichtung,
wobei die Anzeigevorrichtung eine Lichtquelle mit einer Anzahl von primären Anzeigefarben einschließt, wobei die Anzahl von primären Anzeigefarben eine Anzahl von Primärfarben, die einen festgelegten Farbgamut definieren, übersteigt, wobei die Anzeigevorrichtung weiter einen räumlichen Lichtmodulator einschließt, der von der Lichtquelle beleuchtet wird,
wobei die Steuerung eingesetzt werden kann, um:

Videodaten einschließlich Intensitätswerten zu empfangen, die mit einer Anzahl von Farben verknüpft sind, welche kleiner ist als die Anzahl von primären Anzeigefarben;

auf Basis der Videodaten Intensitätswerte zu erzeugen, die mit einem ersten virtuellen Farbgamut verknüpft sind, wobei der erste virtuelle Farbgamut durch eine Kombination der primären Anzeigefarben so definiert wird, dass er zu dem festgelegten Farbgamut passt;

auf Basis der Videodaten Intensitätswerte zu erzeugen, die mit einem zweiten virtuellen Farbgamut verknüpft sind, wobei der zweite virtuelle Farbgamut auf Basis von Restleistung der Lichtquelle unter Berücksichtigung des ersten virtuellen Farbgamuts definiert wird;

auf Basis der Videodaten Intensitätswerte zu erzeugen, die mit dem zweiten virtuellen Farbgamut verknüpft sind;

durch Berechnen einer gewichteten Kombination der Intensitätswerte, die mit dem ersten und zweiten virtuellen Gamut verknüpft sind, für jede der primären Anzeigefarben Intensitätswerte zu erzeugen, wobei die gewichtete Kombination durch Anwenden einer ersten Mischmatrix auf die Intensitätswerte, die mit dem ersten virtuellen Gamut verknüpft sind, und Anwenden einer zweiten Mischmatrix auf die Intensitätswerte, die mit dem zweiten virtuellen Gamut verknüpft sind, und Addieren der Ergebnisse berechnet wird; und

die Intensitätswerte für jede der primären Anzeigefarben dem räumlichen Lichtmodulator bereitzustellen.


 
14. Steuerung nach Anspruch 13, die weiter dazu eingerichtet ist, das Verfahren nach einem der Ansprüche 2-11 durchzuführen.
 
15. Anzeigevorrichtung, welche einschließt:

eine Lichtquelle mit einer Anzahl von primären Anzeigefarben, wobei die Anzahl von primären Anzeigefarben eine Anzahl von Primärfarben, die ein festgelegtes Farbgamut definieren, übersteigt;

einen räumlichen Lichtmodulator, der von der Lichtquelle beleuchtet wird; und

die Steuerung nach Anspruch 13 oder Anspruch 14.


 


Revendications

1. Procédé pour l'affichage de données d'image, ledit procédé comprenant :

la réception d'une gamme de couleurs établie définie par un nombre prédéfini de couleurs primaires ;

la réception d'un nombre de couleurs d'affichage primaires associées à une source de lumière, ledit nombre de couleurs d'affichage primaires associées à ladite source de lumière dépassant ledit nombre de couleurs primaires définissant ladite gamme de couleurs établie ;

la réception d'une première gamme de couleurs virtuelle basée sur une combinaison desdites couleurs d'affichage primaires associées à ladite source de lumière pour approcher ladite gamme de couleurs établie ;

la réception de données vidéo incluant des valeurs d'intensité correspondant à un nombre de couleurs inférieur audit nombre de couleurs primaires associées à ladite source de lumière ;

la génération de valeurs d'intensité associées à ladite première gamme de couleurs virtuelle sur la base desdites données vidéo ;

la réception d'une seconde gamme de couleurs virtuelle basée sur une puissance résiduelle de ladite source de lumière en considérant ladite première gamme de couleurs virtuelle ;

la génération de valeurs d'intensité associées à ladite seconde gamme de couleurs virtuelle sur la base desdites données vidéo ;

la réception de première et seconde matrices de mélange pour calculer une combinaison pondérée desdites valeurs d'intensité associées auxdites première et seconde gammes de couleurs virtuelles ;

la génération de valeurs d'intensité associées auxdites couleurs d'affichage primaires de ladite source de lumière en calculant une combinaison pondérée desdites valeurs d'intensité associées auxdites première et seconde gammes de couleurs virtuelles, dans lequel ladite combinaison pondérée est calculée en appliquant ladite première matrice de mélange auxdites valeurs d'intensité associées à ladite première gamme virtuelle et en appliquant ladite seconde matrice de mélange auxdites valeurs d'intensité associées à ladite seconde gamme virtuelle et en additionnant les résultats ; et

la fourniture desdites valeurs d'intensité associées auxdites couleurs d'affichage primaires à un modulateur spatial de lumière.


 
2. Procédé selon la revendication 1, dans lequel ledit nombre de couleurs d'affichage primaires est deux fois plus grand que ledit nombre de couleurs correspondant auxdites valeurs d'intensité desdites données vidéo.
 
3. Procédé selon la revendication 2, dans lequel ledit nombre de couleurs d'affichage primaires est 6 et lesdites valeurs d'intensité vidéo correspondant à pas plus de 3 couleurs.
 
4. Procédé selon l'une quelconque des revendications 1 à 3, dans lequel au moins une parmi lesdites étapes de génération de valeurs d'intensité associées à ladite première gamme de couleurs virtuelle sur la base desdites données vidéo et de génération de valeurs d'intensité associées à ladite seconde gamme de couleurs virtuelle sur la base desdites données vidéo inclut :

la détermination d'un niveau d'intensité indiqué par lesdites données vidéo ; et

la génération desdites valeurs d'intensité associées à au moins une parmi ladite première gamme de couleurs virtuelle et ladite seconde gamme de couleurs virtuelle sur la base dudit niveau d'intensité indiqué par lesdites données vidéo.


 
5. Procédé selon la revendication 4, dans lequel la génération desdites valeurs d'intensité associées à au moins une parmi ladite première gamme de couleurs virtuelle et ladite seconde gamme de couleurs virtuelle sur la base dudit niveau d'intensité indiqué par lesdites données vidéo inclut :

la détermination si ledit niveau d'intensité indiqué par lesdites données vidéo dépasse un niveau d'intensité prédéterminé ; et

si ledit niveau d'intensité indiqué par lesdites données vidéo ne dépasse pas ledit niveau d'intensité prédéterminé, alors la génération desdites valeurs d'intensité associées à ladite première gamme virtuelle sur la base desdites données vidéo et le réglage desdites valeurs d'intensité associées à ladite seconde gamme virtuelle à zéro.


 
6. Procédé selon la revendication 5, dans lequel :

ladite étape de détermination d'un niveau d'intensité indiqué par lesdites données vidéo inclut la détermination d'un niveau d'intensité séparé pour chaque couleur dudit nombre de couleurs représentées par lesdites données vidéo ; et

ladite étape de détermination si ledit niveau d'intensité indiqué par lesdites données vidéo dépasse un niveau d'intensité prédéterminé inclut la détermination si chacun desdits niveaux d'intensité séparés pour chaque couleur dépasse un niveau d'intensité prédéterminé.


 
7. Procédé selon la revendication 5 ou la revendication 6, dans lequel, si ledit niveau d'intensité indiqué par lesdites données vidéo ne dépasse pas ledit niveau d'intensité prédéterminé, alors :

la génération d'une valeur d'intensité associée à ladite première gamme virtuelle sur la base dudit niveau d'intensité prédéterminé ; et

la génération d'une valeur d'intensité associée à ladite seconde gamme virtuelle sur la base d'une quantité de laquelle ledit niveau d'intensité indiqué par lesdites données vidéo dépasse ledit niveau d'intensité prédéterminé.


 
8. Procédé selon l'une quelconque des revendications 1 à 7, dans lequel la seconde gamme virtuelle est mise à l'échelle pour ajuster des valeurs d'intensité desdites données vidéo dans un volume de gamme réalisable de la source de lumière ; ou :
dans lequel la seconde gamme virtuelle est mise à l'échelle pour ajuster des valeurs d'intensité desdites données vidéo dans un volume de gamme réalisable de la source de lumière et dans lequel la mise à l'échelle comprend la compression de la seconde gamme virtuelle vers le blanc.
 
9. Procédé selon l'une quelconque des revendications 1 à 8, comprenant en outre l'écrêtage de valeurs d'intensité d'au moins une parmi ladite première gamme virtuelle et ladite seconde gamme virtuelle pour ajuster dans un volume de gamme réalisable de la source de lumière.
 
10. Procédé selon la revendication 9, dans lequel des valeurs d'intensité d'au moins une parmi ladite première gamme virtuelle et ladite seconde gamme virtuelle sont écrêtées vers le blanc ; ou :
dans lequel des valeurs d'intensité d'au moins une parmi ladite première gamme virtuelle et ladite seconde gamme virtuelle sont écrêtées vers le bord dudit volume de gamme réalisable.
 
11. Procédé selon l'une quelconque des revendications 1 à 10, comprenant en outre :

la modélisation d'un volume de gamme réalisable de ladite première gamme virtuelle et ladite seconde gamme virtuelle ;

la détermination si lesdites valeurs d'intensité générées de ladite première gamme virtuelle et ladite seconde gamme virtuelle s'ajustent dans ledit volume de gamme modélisé ;

le fait de laisser inchangées lesdites valeurs d'intensité de ladite première gamme virtuelle et ladite seconde gamme virtuelle qui s'ajustent dans ledit volume de gamme modélisé ; et

la modification de valeurs d'intensité de ladite première gamme virtuelle et ladite seconde gamme virtuelle qui ne s'ajustent pas dans ledit volume de gamme modélisé.


 
12. Support lisible électroniquement ayant un code incorporé à l'intérieur pour amener un contrôleur pour un dispositif d'affichage à effectuer le procédé selon l'une quelconque des revendications 1 à 11.
 
13. Contrôleur pour un dispositif d'affichage,
le dispositif d'affichage incluant une source de lumière ayant un nombre de couleurs d'affichage primaires, ledit nombre de couleurs d'affichage primaires dépassant un nombre de couleurs primaires définissant une gamme de couleurs établie, le dispositif d'affichage incluant en outre un modulateur spatial de lumière illuminé par ladite source de lumière,
le contrôleur étant utilisable pour :

recevoir des données vidéo incluant des valeurs d'intensité associées à un nombre de couleurs inférieur audit nombre de couleurs primaires ;

générer des valeurs d'intensité associées à une première gamme de couleurs virtuelle sur la base desdites données vidéo, ladite première gamme de couleurs virtuelle étant définie par une combinaison desdites couleurs d'affichage primaires pour correspondre à ladite gamme de couleurs établie ;

générer des valeurs d'intensité associées à une seconde gamme de couleurs virtuelle sur la base desdites données vidéo, ladite seconde gamme de couleurs virtuelle étant définie sur la base d'une puissance résiduelle de ladite source de lumière en considérant ladite première gamme de couleurs virtuelle ;

générer des valeurs d'intensité associées à ladite seconde gamme de couleurs virtuelle sur la base desdites données vidéo ;

générer des valeurs d'intensité pour chacune desdites couleurs d'affichage primaires en calculant une combinaison pondérée desdites valeurs d'intensité associées auxdites première et seconde gammes virtuelles, dans lequel ladite combinaison pondérée est calculée en appliquant une première matrice de mélange auxdites valeurs d'intensité associées à ladite première gamme virtuelle et en appliquant une seconde matrice de mélange auxdites valeurs d'intensité associées à ladite seconde gamme virtuelle et en additionnant les résultats ; et

fournir lesdites valeurs d'intensité pour chacune desdites couleurs d'affichage primaires audit modulateur spatial de lumière.


 
14. Contrôleur selon la revendication 13, configuré en outre pour effectuer le procédé selon l'une quelconque des revendications 2 à 11.
 
15. Dispositif d'affichage incluant :

une source de lumière ayant un nombre de couleurs d'affichage primaires, ledit nombre de couleurs d'affichage primaires dépassant un nombre de couleurs primaires définissant une gamme de couleurs établie ;

un modulateur spatial de lumière illuminé par ladite source de lumière ; et

le contrôleur selon la revendication 13 ou la revendication 14.


 




Drawing


























Cited references

REFERENCES CITED IN THE DESCRIPTION



This list of references cited by the applicant is for the reader's convenience only. It does not form part of the European patent document. Even though great care has been taken in compiling the references, errors or omissions cannot be excluded and the EPO disclaims all liability in this regard.

Non-patent literature cited in the description