Image analysis – Color image processing – Compression of color images
Patent
1995-05-26
1998-11-17
Chang, Jon
Image analysis
Color image processing
Compression of color images
382233, 382248, 358433, 358539, G06T 900
Patent
active
058388176
ABSTRACT:
When a pixel block of a color image is coded, the coding is performed by taking the correlation between lightness and chromaticity into account. More specifically, the color data within the pixel block is separated into lightness and chromaticity. Lightness is coded by being subjected to an orthogonal transformation. The coding of chromaticity is performed by detecting the average value of chromaticity and the amplitude of chromaticity of a pixel block, calculating the ratio of chromaticity amplitude to lightness amplitude and then coding chromaticity based upon the calculated ratio and the average value of chromaticity.
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Canon Kabushiki Kaisha
Chang Jon
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