Image encoding method and image decoding method
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsKiyofumi Abe, Shinya Kadono, Satoshi Kondo, Makoto Hagai
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Abstract
The method includes the following units: a coefficient number detecting unit (109) for detecting the number of coefficients which has a value other than 0 for each block according to the generated coefficient, a coefficient number storing unit (110) for storing the number of coefficients detected, a coefficient number coding unit (111) for selecting a table for variable length coding based on the numbers of coefficients in the coded blocks located on the periphery of a current block to be coded with reference to the selected table for variable length coding so as to perform variable length coding for the number of coefficients.
Claims7
A decoding method for decoding coded data on a block basis, the method comprising:
- determining a predictive value for a total number of non-zero coefficients included in a current block to be decoded based on a total number of non-zero coefficients included in a decoded block located adjacent to the current block, wherein each non-zero coefficient is a transform coefficient having a level value other than “0”;
- selecting a variable length decoding method based on the determined predictive value;
- and
- decoding the coded data obtained by coding the total number of non-zero coefficients included in the current block by using the selected variable length decoding method.
A decoding method for decoding coded data on a block basis, the method comprising:
- determining a predictive value for a total number of non-zero coefficients included in a current block to be decoded based on a total number of non-zero coefficients included in a decoded block located adjacent to the current block, wherein each non-zero coefficient is a transform coefficient having a level value other than “0”;
- selecting a variable length code table based on the determined predictive value;
- and
- decoding the coded data obtained by coding the total number of non-zero coefficients included in the current block by using the selected variable length code table.
Dependencies are inferred from the claim text.