Patent ID: 6853318
Filing Date: 2005-02-08
Classification: H03M,H04N

Abstract:
1. A method for encoding digital image data representing a plurality of initial pixels, each said initial pixel having a coordinate, said method having a plurality of predefined image types, each said image type having a preassigned one of a plurality of quantization step-size sets, said method comprising the steps of: associating a respective one of a plurality of different image types and a respective said quantization step-size set with each of the coordinates; transforming the digital image data using a subband decomposition to produce a plurality of subbands, each said subband having a plurality of subband coefficients, said subband coefficients defining a plurality of resultant pixels and ones of said resultant pixels contributed to by respective said subband coefficients, said resultant pixels each having a respective one of said coordinates; shrinking each of said subband coefficients by an adjustment that is a function of respective said quantization step-size sets of said coordinates of respective said ones of said resultant pixels to provide corresponding adjusted coefficients.