Global patent index - EP 1000506 A1

EP 1000506 A1 2000-05-17 - DIGITAL CORRELATED DOUBLE SAMPLE CAMERA

Title (en)

DIGITAL CORRELATED DOUBLE SAMPLE CAMERA

Title (de)

KAMERA MIT DIGITALER KORRELIERTER DOPPELABTASTUNG

Title (fr)

CAMERA NUMERIQUE A ECHANTILLONNAGE DOUBLE CORRELE

Publication

EP 1000506 A1 (EN)

Application

EP 98938145 A

Priority

  • US 9815848 W
  • US 90415997 A

Abstract (en)

[origin: WO9907138A1] A digital electronic camera, method and circuit for converting an analog image-bearing signal from an electronic imaging device. The image-bearing signal provides both a pixel-reference signal and a pixel-image signal for each one of a plurality of pixels of the imaging device. The circuit includes a voltage clamp that adjusts a level of the image-bearing signal based on a black reference level to produce a clamped image-bearing signal. An analog-to-digital converter (ADC) is coupled to digitize the clamped image-bearing signal and operated to produce a first digital value representative of the pixel-reference signal for a pixel, and operated to produce a second digital value representative of the pixel-image signal. Then, a first digital subtractor generates a first digital difference signal based on the first and second digital values to reduce pixel-to-pixel noise and/or drift. The circuit optionally includes a feedback circuit that adjusts the black-reference level based on a comparison between the digital reference value and a digital black-reference value selected to be near or at one end of a range of values accommodated by the ADC. The circuit further optionally includes a clock-adjustment circuit that adjusts an image-voltage-signal sampling clock and/or a reference-voltage-signal sampling clock to sample the respective signal at substantially an end of a valid sampling interval. The circuit further optionally includes an accumulator/averager which is operated to accumulate and average one or more digital values of non-imaging pixels to produce a third digital value, and a second digital subtractor is operated to generate a second digital difference signal based on the first on the first digital difference signal and the third digital value, to reduce row-to-row noise and/or drift. A dovetail camera mounting system is also disclosed.

IPC 1-7 (main, further and additional classification)

H04N 5/217

IPC 8 full level (invention and additional information)

H04N 5/18 (2006.01); H04N 5/217 (2011.01); H04N 5/225 (2006.01); H04N 5/335 (2011.01); H04N 5/357 (2011.01); H04N 5/361 (2011.01); H04N 5/378 (2011.01)

CPC (invention and additional information)

H04N 5/361 (2013.01); H04N 5/185 (2013.01); H04N 5/2252 (2013.01); H04N 5/3575 (2013.01); H04N 5/378 (2013.01)

Citation (search report)

See references of WO 9907138A1

Designated contracting state (EPC)

DE FR GB

EPO simple patent family

WO 9907138 A1 19990211; EP 1000506 A1 20000517

INPADOC legal status

2002-03-06 [18D] DEEMED TO BE WITHDRAWN

- Ref Legal Event Code: 18D

- Effective date: 20010822

2001-04-18 [17Q] FIRST EXAMINATION REPORT

- Ref Legal Event Code: 17Q

- Effective date: 20000801

2000-06-21 [RIN1] INVENTOR (CORRECTION)

- Ref Legal Event Code: RIN1

- Inventor name: TONKIN, STEVEN, W.

2000-06-21 [RIN1] INVENTOR (CORRECTION)

- Ref Legal Event Code: RIN1

- Inventor name: LIEBERT, SCOTT, S.

2000-05-17 [17P] REQUEST FOR EXAMINATION FILED

- Ref Legal Event Code: 17P

- Effective date: 20000204

2000-05-17 [AK] DESIGNATED CONTRACTING STATES:

- Ref Legal Event Code: AK

- Designated State(s): DE FR GB