| 摘要 |
Image quality deterioration degree estimation (step S2) is made on the basis of quantization error between decoded image of coded data and input image and estimated value of image quality deterioration in the case of the missing of the coded data due to occurrence of transmission error with a certain probability. All the blocks in the frame are coded by determining block coding mode to be either inter-frame predictive coding or intra-frame coding on the basis of the image quality deterioration degrees of all the blocks in the frame. By intra-frame coding the image on the basis of the expected value of the image quality deterioration, it is possible to suppress deterioration of the decoded image in the case of the missing of some of the coded data due to error occurrence. With collective dealing of the quantization error and the deterioration error, the number of blocks with the refreshing set therefor are not greatly increased, and it is also possible to suppress image quality deterioration of decoded image in the case of no error occurrence.
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