DECODER AND DECODING PROGRAM

摘要

PROBLEM TO BE SOLVED: To provide a decoder and a decoding method for assuring higher efficiency in a decoding process.

SOLUTION: The decoder includes a copying means for copying picture data decoded by the last decoding process to a storing region to which the picture data as a decoding object should be entered, an extracting means for extracting, from the encoded data extracted by the decoder, the encoded data of macro block to be decoded next included in the picture data as the decoding object, a determining means for determining whether the macro block to be decoded next matches with the macro block in the same location of the picture data decoded by the last decoding process based on the data showing the decoding method of the macro block to be decoded next, and a decoding means for decoding the encoded data of the macro block to be decoded next and writing the encoded data of the relevant macro block to the storing region when it is determined that both macro blocks do not match with each other by the determining means and for executing no decoding process of the encoded data of the macro block to be decoded next when it is determined that both macro blocks match with each other by the determining means.

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