Importance

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Abstract

A moving picture transmission system enhances the quality of a demand-refreshed image without increasing the amount of code to be transmitted. When a picture data error has been detected, a reception side coder transmits to a transmission side decoder information concerning the location of the error detected in a picture frame. Upon receipt of this information, for several frames, beginning with the picture frame that is distorted by the error and continuing up until the picture frame preceding the frame to be transmitted, the transmission side determines a portion that may be distorted by the occurrence of the error or by the transmission of the error, and a picture portion that may be affected by distortion when picture data are to be coded in the inter-frame coding mode. Only the picture portion that the transmission side determines will be affected is forcibly coded in the intra-frame coding picture mode, the other picture portions being coded in the normal manner, and the resultant picture data are transmitted to the reception side.

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First Claim