Patent ID: 7050642
Filing Date: 2006-05-23
Classification: H04N

Abstract:
1. 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; 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; and encoding 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.