Image analysis – Color image processing
Reexamination Certificate
2003-12-25
2008-08-26
Couso, Jose L (Department: 2624)
Image analysis
Color image processing
Reexamination Certificate
active
07418129
ABSTRACT:
The present invention relates to an apparatus, a method, and a program for processing images that can reproduce images in which color tones are preserved even when a luminance signal level is changed by gradation conversion. A Y-matrix unit112and a C-matrix unit113convert an original color obtained from image-sensing devices111to luminance signals and color-difference signals. A gradation-correction unit114performs gradation adjustment on luminance signals Y and convert them to luminance signals Y′ to be output. The gradation-correction unit114further converts the luminance signals Y′ to signals Y′, which are Y signals according to the XYZ color system, and outputs them to a color-difference correction unit115. The color-difference correction unit115calculates values h1and h2corresponding to hue H and chroma C according to the Munsell color system, and calculates X′ and Z′ according to the XYZ color system after gradation correction so as to preserve the hue H and the chroma C, based on the signals Y′, which are Y signals according to the XYZ color system after the gradation adjustment. The present invention can be applied to products for performing digital image processing.
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Couso Jose L
Frommer William S.
Frommer & Lawrence & Haug LLP
Sony Corporation
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