Patent ID: 6490372
Filing Date: 2002-12-03
Classification: H03M,H04N

Abstract:
An image decoding method for extracting a variable length code from compression-coded data, obtaining an event corresponding to said variable length code by using a variable length code table wherein a reference event consisting of Last, Run, Level, is assigned to each reference variable length code, and deriving an output transform coefficient from said event, the method comprising:judging whether said variable length code includes a control code, a first mode code, a second mode code or a third mode code, obtaining an event corresponding to said variable length code by using said variable length code table in the case when said variable length code is judged to include none of said control code, said first mode code, said second mode code and said third mode code, obtaining an event corresponding to said variable length code by using said variable length code table and then obtaining a transformed event by transforming the Level value of said event corresponding to said variable length code using a predetermined function in the case when said variable length code is judged to include said control code and said second mode code, obtaining an event corresponding to said variable length code by using said variable length code table and then obtaining a transformed event by transforming the Run value of said event corresponding to said variable length code using a predetermined function in the case when said variable length code is judged to include said control code and said third mode code, obtaining an event by subjecting said variable length code to fixed length decoding in the case when said variable length code is judged to include said control code and said first mode code.