Computer graphics processing and selective visual display system – Computer graphics processing – Attributes
Reexamination Certificate
2005-04-21
2010-02-09
Sajous, Wesner (Department: 2628)
Computer graphics processing and selective visual display system
Computer graphics processing
Attributes
C345S589000, C345S600000, C345S606000, C345S643000, C382S162000, C382S167000, C382S300000, C358S518000, C358S525000, C708S204000, C708S495000, C708S497000, C708S501000, C712S221000, C712S222000
Reexamination Certificate
active
07659911
ABSTRACT:
A method and apparatus for perfectly lossless and minimal-loss interconversion of digital color data between spectral color spaces (RGB) and perceptually based luma-chroma color spaces (Y′CBCR) is disclosed. In particular, the present invention provides a process for converting digital pixels from R′G′B′ space to Y′CBCRspace and back, or from Y′CBCRspace to R′G′B′ space and back, with zero error, or, in constant-precision implementations, with guaranteed minimal error. This invention permits digital video editing and image editing systems to repeatedly interconvert between color spaces without accumulating errors. In image codecs, this invention can improve the quality of lossy image compressors independently of their core algorithms, and enables lossless image compressors to operate in a different color space than the source data without thereby becoming lossy. The present invention uses fixed-point arithmetic with signed and unsigned rounding normalization at key points in the process to maintain reversibility.
REFERENCES:
patent: 6954214 (2005-10-01), Wilt et al.
patent: 2002/0085015 (2002-07-01), Wilt et al.
patent: 2003/0222998 (2003-12-01), Yamauchi et al.
patent: 2004/0201593 (2004-10-01), Nishimura et al.
patent: 2005/0168487 (2005-08-01), Wilt et al.
Albert Philip H.
Sajous Wesner
Townsend and Townsend / and Crew LLP
LandOfFree
Method and apparatus for lossless and minimal-loss color... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for lossless and minimal-loss color..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for lossless and minimal-loss color... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4157290