Patent ID: 6445827
Filing Date: 2002-09-03
Classification: H03M,H04N

Abstract:
An image coding method in which variable length coding process is performed to the transform coefficients by referring to a variable length code table comprising a plurality of reference events, consisting of Last, Run, Level, paired with reference variable length codes wherein the variable length coding process comprises:obtaining an input event consisting of Last, Run, Level, corresponding to said transform coefficients, comparing said input event with a reference event in said table, and if said input event accords with said reference event, outputting a variable length code corresponding to said reference event, and if said input event does not accord with any reference event in said table, obtaining a second transformed input event, by transforming the Run value of said input event using a predetermined function, comparing said second transformed input event with a reference event in said table, and if said second transformed input event accords with said reference event, outputting a control code and a third mode code followed by a variable length code corresponding to said reference event, wherein the control code is â€œ0000011â€ , and the third mode code is â€œ10â€ .