Patent ID: 7035459
Filing Date: 2006-04-25
Classification: H04N

Abstract:
1. An image compression apparatus for compressing image data that has a luminance signal and chrominance signals, comprising: an image judgement part that judges a proportion of information quantity in the image data that is part of the chrominance signals on the basis of both the luminance signal and the chrominance signals; a subsampling rate setting part that sets a subsampling rate of the chrominance signals in accordance with the proportion; a subsampling processing part that performs subsampling processing for the chrominance signals in the image data at the subsampling rate; a compression encoding part which subjects the subsampling-processed image data to compression encoding; and wherein the subsampling setting part sets the subsampling rate of the chrominance signals at a coarse value when it is judged by the image judgement part that the proportion is small and sets the subsampling rate of the chrominance signals at a fine value when it is judged by the image judgement part that the proportion is large.