Image analysis – Color image processing
Reexamination Certificate
2003-02-07
2009-08-25
Ahmed, Samir A. (Department: 2624)
Image analysis
Color image processing
C382S166000, C382S232000, C382S233000
Reexamination Certificate
active
07580561
ABSTRACT:
A compression and de-compression arrangement is provided for a display device having a display memory and a display. The arrangement includes a color processor which reduces the color samples by processing a pair of pixels to produce first and second luminance values and forming first and second output chrominance values from the pair of pixels. The first and second output chrominance values are formed by calculating for each pixel the corresponding U and V chrominance values and forming the first and second chrominance values (U, V) from the average of the values for each pixel.Forming the compressed representation of the color image provides an advantage when recovering the original image, particularly for example where the image contains detail and/or text. The image processing apparatus of the system receives the group of color component signal samples from the display memory and generates first and second output pixels, each comprising three color component values (R, G, B), from each group. The image processing apparatus includes a detail detection processor, which detects whether either of the pixels represented by each group of signal samples represents white or black and the other does not. This may be representative of one of the pixels being part of a text character or detail. Accordingly, in order to improve the likelihood of preserving the text and detail in the reproduced image, the de-compressing processor is arranged to assign the chrominance values (U1, V1) of one of the pixels to zero. The other chrominance value (U2, V2) of the other pixel is assigned the value of twice the value of the first and second input chrominance values respectively.
REFERENCES:
patent: 4533936 (1985-08-01), Tiemann et al.
patent: 4597005 (1986-06-01), Baleshta et al.
patent: 5182635 (1993-01-01), Nakashima et al.
patent: 5621819 (1997-04-01), Hozumi
patent: 5872556 (1999-02-01), Rackley et al.
patent: 5875044 (1999-02-01), Seto et al.
patent: 5909254 (1999-06-01), Feig et al.
patent: 6072539 (2000-06-01), Harlos et al.
patent: 6108048 (2000-08-01), Rinaldi
patent: 6154288 (2000-11-01), Watanabe
patent: 6535663 (2003-03-01), Chertkow
patent: 6553459 (2003-04-01), Silverbrook et al.
patent: 6614471 (2003-09-01), Ott
patent: 6937774 (2005-08-01), Specht et al.
patent: 7113227 (2006-09-01), Kakuya et al.
patent: 7149350 (2006-12-01), Shoda et al.
patent: 7257251 (2007-08-01), Matthews
patent: 0 283 627 (1988-09-01), None
patent: WO 93/14600 (1993-07-01), None
patent: WO-9722206 (1997-06-01), None
Hirohisa Yamaguchi “Vector Quantization of f Differential Luminance and Chrominance Signals” IEEE Transactions on Communications, vol. COM-33, No. 5, May 1985, pp. 457-465.
Marek Domuliski, Krzyszto Rakowski “Lossless and Near-Lossless Image Compression With Color Transformations” IEEE 2001, pp. 445-457.
Patent Abstracts of Japan; Publication No. 2000070267; Publication Date Mar. 7, 2000.
Calder Keith Robert
Chaibelaine Nordine
Levine Stuart Jonathan
Ahmed Samir A.
Bekele Mekonen
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Sony United Kingdom Limited
LandOfFree
Image processing apparatus and method does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Image processing apparatus and method, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Image processing apparatus and method will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4136943