Patent ID: 6031937
Filing Date: 2000-02-29
Classification: H04N

Abstract:
A method for compressing an image of a first color space, wherein said image is divided into a plurality of blocks, comprising the steps of:computing an average color of a block of said plurality of blocks, said block comprising a plurality of pixels;computing an average luminance of said block dependent on said average color and a differential luminance of each pixel of said plurality of pixels of said block, wherein differential luminance is the difference in luminance value between each particular luminance value of each pixel of said plurality of pixels and the average luminance value of said block;providing a first plurality of frequency details of said block by transforming said differential luminance of each pixel of said plurality of pixels of said block;computing an average color difference between said block and a previous block;quantizing said average color difference and said first plurality of frequency details; andencoding said quantized average color difference and a second plurality of frequency details, wherein said second plurality of frequency details is less than or equal to said first plurality of frequency details.