| 摘要 |
PROBLEM TO BE SOLVED: To make coding length of an image coding data to be fixed length according to a coding length which is to be a required reference. SOLUTION: A discrete wavelet conversion part 110 performs discrete wavelet conversion with an image data (step S1501). A factor quantization part 112 performs quantization (step S1502). An entropy coding part 113 entropy-codes a factor quantized value by arithmetic coding (step S1503). If the coding length of a quasi-image coding data is longer than the coding length specified at a specified-image coding data coding-length input part 102 (step S1505), the entropy coded value is deleted in sub-band unit for a specified coding length (step S1506). If the coding length of the quasi-image coded data is shorter than the specified coding length (step S1505), an adjustment bit is added (step S1507). |
