| 摘要 |
PROBLEM TO BE SOLVED: To detect data error from received moving image coded data efficiently with a very simple configuration. SOLUTION: An error detector 103 discriminates whether or not received mode information indicates the inter-frame coding image mode, and in the case of the inter-frame coding image mode through the discrimination, a variance of a luminance Ei ,j of a picture element obtained after IDC transformation and a variance of sum of luminance values O'i ,j E'i ,j of a predicted image are calculated and whether or not the result satisfies a prescribed condition is discriminated. In the case that the prescribed condition is satisfied in this discrimination, it is discriminated that an error is detected and an error detection signal is given to a video signal decoder 102. In the case that the mode is not the inter-frame coding image mode through the discrimination as to whether or not the received mode information depicts in the inter-frame coding image mode, whether or not all the values Ei ,j in this macro block are positive is discriminated. When discriminated not to be positive in this discrimination, the error detection signal is given to a video signal decoder 102. |
