Color image processing method and apparatus thereof
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United States of America Patent
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Nov 26, 2002
Issued Date -
N/A
app pub date -
Jul 2, 1997
filing date -
Jul 27, 1993
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Abstract
A color image processing apparatus which codes image data while suppressing image deterioration. A color character area discrimination unit divides an input color image into 16.times.16-pixel blocks, and determines whether or not each block expresses color characters. In accordance with the determination result, a sub-sampling ratio switching unit switches the sampling ratio for each of color components YCrCb composing the color image data so that the sample ratio is Y:Cr:Cb=4:2:2 or Y:Cr:Cb=4:1:1. Subsequently, sampling is performed in accordance with the switched sampling ratio, and DCT, linear quantization and entropy coding are then performed.
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