VARIABLE LENGTH CODING METHOD AND VARIABLE LENGTH DECODING METHOD.

摘要

An image coding apparatus (103) for coding a quantization coefficient of an image signal as data to be processed includes a run length coder (RLE2) for assigning a variable length code to the quantization coefficient by using a coding table. According to a first code table, the run length coder (RLE2) creates a second code table optimized for the data to be processed. According to a quantization parameter (QP) or a variable length coding selection signal (VlcSel), the first or the second code table is selected as a code table to be used for assigning the variable length code. Thus, it is possible to effectively remove the information redundancy present in the data to be processed and to improve the compression ratio of an image signal.