| US 7,580,561 B2 | ||
| Image processing apparatus and method | ||
| Keith Robert Calder, Ashford (United Kingdom); Nordine Chaibelaine, Anthony (France); and Stuart Jonathan Levine, Stockbridge (United Kingdom) | ||
| Assigned to Sony United Kingdom Limited, Weybridge (United Kingdom) | ||
| Appl. No. 10/505,319 PCT Filed Feb. 07, 2003, PCT No. PCT/GB03/00558 § 371(c)(1), (2), (4) Date Mar. 14, 2005, PCT Pub. No. WO03/071782, PCT Pub. Date Aug. 28, 2003. |
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| Claims priority of application No. 0204237.2 (GB), filed on Feb. 22, 2002. | ||
| Prior Publication US 2005/0207662 A1, Sep. 22, 2005 | ||
| Int. Cl. G06K 9/00 (2006.01) | ||
| U.S. Cl. 382—162 [382/166; 382/232; 382/233] | 10 Claims |
| 1. An image processing apparatus configured to reproduce pixels representative of a colour image from groups of colour component
signal samples representing the image, each of said groups representing two of said pixels and comprising two input luminance
values, one for each pixel, and first and second input chrominance values formed by averaging first and second chrominance
values for each pixel, said apparatus comprising:
a de-compressing processor configured to receive said groups of colour component signal samples and to generate reproduced
pixels, each comprising three colour component values, and
a detail detection processor configured to detect whether one of said first and second pixels is representative of substantially
white or substantially black and the other of said pixels is not representative of substantially white or substantially black,
and if so, arranging for said de-compressing processor,
to assign to first and second chrominance values for the one of said first and second pixels representing substantially white
or black the value of zero,
to assign to first and second chrominance values for the other of said first and second pixels, not representing substantially
white or black, twice the value of the first and second input chrominance values respectively, and
to reproduce the three colour components of each pixel from the corresponding input luminance value and the assigned first
and second chrominance values, and otherwise
to reproduce the three colour components of each pixel from the corresponding input luminance value in combination with the
first and second input chrominance values.
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