To stably reduce or eliminate block distortion through simple processings and to prevent errors in discrimination, in the case of discriminating the block distortion.
Block distortion discrimination and coding difficulty discriminating circuits 74, 84 obtain a parameter denoting the difficulty of coding from a motion vector and a motion compensation residue, which are obtained by applying motion detection processing different from motion prediction coding to received image data by a pre-processor 30, parameter arithmetic circuits 73, 83 calculate a parameter required for block distortion discrimination from the received image data, the block distortion discrimination and coding difficulty discriminating circuits 74, 84 discriminate block distortion, on the basis of the parameter denoting the difficulty of coding and the calculated parameters to calculate a correction value for reducing the block distortion, and a correction circuit 60 subjects the received image data to a correction using the correction value.
KOBAYASHI HIROSHI
FUKUDA KYOKO
OBATA KOJI
KATO MOTOKI
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