Patent ID: 8374255

Claim:
A decoder for decoding a sequence of moving picture frames that has been divided into a sequence of key frames and a sequence of non-key frames, the decoder receiving coded data, error-correcting information, and correlation information from an encoder, the coded data representing the key frames, the error-correcting information representing the non-key frames, the correlation information indicating expected correlations between predicted and original forms of the non-key frames, the decoder comprising: a key frame decoder for decoding the coded data to obtain decoded key frames; a side image generator for generating, from the decoded key frames, a predicted image for each non-key frame in the sequence of non-key frames; a correlation information modifier for modifying the correlation information received from the encoder to obtain modified correlation information; an error-correcting decoder for correcting the predicted image generated by the side image generator according to the error-correcting information received from the encoder and the modified correlation information to obtain a decoded non-key frame; and a decoded image generator for generating a reconstructed non-key frame from the predicted image generated by the side image generator and the decoded non-key frame obtained by the error-correcting decoder; wherein the decoder also receives from the encoder first prediction method information indicating a prediction method used by the encoder, and the correlation information modifier modifies the correlation information received from the encoder by multiplying the correlation information by a weighting coefficient determined from the first prediction method information.