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Abstract

When decoding code data of a video wherein each frame that forms the video is divided into a plurality of processing regions, each processing region is subjected to predictive decoding, a provisional decoded image obtained by provisional image decoding utilizing a low-resolution prediction residual is generated, and a final decoded image is generated by updating decoded values of the provisional decoded image. Additionally, when dividing each frame that forms a video into a plurality of processing regions and subjecting each processing region to predictive encoding in which a high-resolution prediction residual is subjected to downsampling to generate a low-resolution prediction residual, a subsampled prediction residual is generated by a subsampling process which subjects only part of pixels of the high-resolution prediction residual to sampling, and the subsampled prediction residual is determined to be the low-resolution prediction residual.

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