EP 0319684 A3 19910206 - DISPLAY SYSTEM FOR COLOR IMAGE QUANTIZATION
Title (en)
DISPLAY SYSTEM FOR COLOR IMAGE QUANTIZATION
Publication
Application
Priority
US 11188787 A 19871023
Abstract (en)
[origin: EP0319684A2] An apparatus for displaying video color images and minimizing buffer memory size quantizes a video image into a reduced number of corresponding color values. A lookup table (16) for driving a refresh buffer is encoded with a set of neighboring color values for transforming a three component color video signal to two-component format. The two-component signals are stored in a frame buffer (20) of reduced capacity sufficient to store the quantized color image. When addressed by a raster scan (21) the frame buffer is read out into a second lookup table (22) for converting the quantized image into a reduced set of color values. Since no intermediate computing or processing is required, the transformation is accomplished in real time, allowing contemporaneous color display while reducing buffer memory size demands.
IPC 1-7
IPC 8 full level
G06F 3/153 (2006.01); G06T 11/00 (2006.01); G09G 5/02 (2006.01); G09G 5/06 (2006.01); G09G 5/36 (2006.01); G09G 5/42 (2006.01)
IPC 8 main group level
H04N (2006.01)
CPC (source: EP)
G09G 5/022 (2013.01); G09G 5/06 (2013.01)
Citation (search report)
- [A] US 4639771 A 19870127 - HATTORI YOSHIHISA [JP], et al
- [A] EP 0132641 A2 19850213 - DORNIER SYSTEM GMBH [DE]
- [AP] SYSTEMS AND COMPUTERS IN JAPAN, vol. 19, no. 3, March 1988, pages 73-78, NY, US; T. AGUI et al.: "Speed-up algorithm of color image quantization"
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
EP 0319684 A2 19890614; EP 0319684 A3 19910206; IL 88097 A0 19890630; JP H0292 A 19900105
DOCDB simple family (application)
EP 88117468 A 19881020; IL 8809788 A 19881020; JP 26627388 A 19881024