Patent ID: 6157741
Filing Date: 2000-12-05
Classification: G06T

Abstract:
An image processing apparatus, comprising:feature extracting means for extracting a feature of a pixel block of input image data, said pixel block comprising a predetermined number of pixels;selecting means for selecting a quantizing coefficient corresponding to said extracted feature;difference calculating means for obtaining difference values of adjacent pixels of each said pixel block of the image data;quantizing means for quantizing the difference values with the selected quantizing coefficient and for outputting compressed image data; andadding means for adding data of said selected quantizing coefficient to said compressed image data and for generating compressed data with a fixed length composed of a multiple of memory access bits,wherein said compressed image data comprises a first compressed pixel data of one pixel of said pixel block and a second compressed pixel data of remaining pixels of said pixel block; andwherein said first compressed pixel data is compressed to a first predetermined bit length, and each pixel data of said second compressed pixel data is compressed to a second predetermined bit length.