| 摘要 |
An encoding apparatus comprises, a detection unit configured to determine a characteristic of the image of each of a plurality of blocks and to detect whether visual degradation in each block is noticeable, a determination unit configured to determine a quantization parameter of each block based on a detection result, a transformation unit configured to perform orthogonal transformation of the block and quantization using the quantization parameter, an encoding unit configured to perform variable-length encoding of a transformation result, an inverse transformation unit configured to inversely transform the transformation result to generate a locally decoded image, and a calculation unit configured to calculate a reference value to change a criterion to determine the characteristic of the image, wherein the detection unit detects a block having noticeable visual degradation by changing the criterion in accordance with the reference value.
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