Computer graphics processing and selective visual display system – Computer graphics processing – Attributes
Reexamination Certificate
2006-05-30
2006-05-30
Luu, Matthew (Department: 2676)
Computer graphics processing and selective visual display system
Computer graphics processing
Attributes
C382S167000
Reexamination Certificate
active
07053910
ABSTRACT:
A metamerism-reducing color transformation in which a color value in a perceptual color space is mapped to a corresponding color value in a device dependent color space. Multiple different inverse transforms are applied to the color value in the perceptual color space, one each for respective ones of multiple different viewing conditions such as different viewing illuminants or different surround, thereby resulting in plural different target color values in a viewing condition dependent space. The plural different target color values in the viewing condition dependent space are subjected to regression analysis based on a spectral model of reflectance of device colors so as to calculate to a single color coordinate in device dependent coordinates that best fits the plural different target color values in the viewing condition dependent space. The regression analysis may be a weighted regression analysis. Because the color value in the destination device dependent color space is obtained through best-fit regression analysis of plural different target color values corresponding to multiple different viewing conditions, metameric shifts in the color's appearance due to changes in viewing condition are significantly reduced as compared to transformations which obtain values accurate only for a single viewing condition.
REFERENCES:
patent: 4839722 (1989-06-01), Barry et al.
patent: 5446476 (1995-08-01), Kouzaki
patent: 5463480 (1995-10-01), MacDonald et al.
patent: 5710876 (1998-01-01), Peercy et al.
patent: 5907495 (1999-05-01), Snyder et al.
patent: 6023527 (2000-02-01), Narahara
patent: 6088038 (2000-07-01), Edge et al.
patent: 6459436 (2002-10-01), Kumada et al.
patent: 6480299 (2002-11-01), Drakopoulos et al.
patent: 6542634 (2003-04-01), Ohga
patent: 6664973 (2003-12-01), Iwamoto et al.
patent: 6668079 (2003-12-01), Takemoto
patent: 11-275376 (1999-10-01), None
International Color Consortium (ICC), “File Format For Color Profiles”, ICC Specification No. ICC.1:Sep. 1998, as amended by “Addendum 2”, Document No. ICC.1A:Apr. 1999.
S.N. Pattanaik, et al., “A Multiscale Model of Adaptation and Spatial Vision for Realistic Image Display”, Program of Computer Graphics, Cornell University.
Henri Maitre, et al., “Spectrophotometric Image Analysis of Fine Art Paintings”, The Fourth Color Imaging Conference: Color Science, Systems and Applications, 1996, IS&T.
Di-Yuan Tzeng and Roy S. Berns, “Spectral-Based Ink Seletion for Multiple-ink Printing II. Optimal Ink Selection”, Munsell Color Science Laboratory, RIT Chester F. Carlson Center for Imaging Science, Copyright 1999, IS&T.
Seth Ansell, “Measurement of Fluorescence In Inkjet and Laser Printing”, Canon Research and Development Center Americas, Inc. San Jose, CA USA.
Canon Kabushiki Kaisha
Luu Matthew
LandOfFree
Reducing metamerism in color management systems does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Reducing metamerism in color management systems, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Reducing metamerism in color management systems will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3650598