Patent ID: 6424739
Filing Date: 2002-07-23
Classification: H04N

Abstract:
An image data compression apparatus, comprising:preliminary image compressing portion for compressing image data in a sampling region set in a specific position on an image plane for obtaining preliminary compressed image data; data size evaluation value calculating portion connected to said preliminary image compressing portion for calculating a data size evaluation value from a data length of said preliminary compressed image data; compression ratio determining portion connected to said data size evaluation value calculating portion for determining compression ratios of the image data to color and luminance data in accordance with said data size evaluation value such that a data size of the compressed image when image compression is performed for the entire image plane of said image data equals a prescribed desired data size and such that said composition ratio of the image data to the color data equals to or exceeds said compression ratio of the image data to the luminance data; and image compressing portion connected to said compression ratio determining portion for performing image compression for said entire image plane of said image data in accordance with said compression ratios of the image data to the color and luminance data.