| 摘要 |
The present invention provides an image signal re-encoding apparatus and image signal re-encoding method, which reduce the amount of processing when re-encoding an image signal, and shorten the processing time required for re-encoding. An image signal re-encoding apparatus, which decodes an input image signal subjected to an encoding, and generates an output image signal by subjecting the decoded image signal to an encoding process of a system different from said encoding, the image signal re-encoding apparatus further comprising; extraction means for extracting orthogonal conversion coefficient information related to the input image signal; determination means for determining the pixel tendency of a pixel block included in the input image signal using the extracted orthogonal conversion coefficient information; prediction mode decision means for deciding an intra-frame prediction mode to be used in said encoding process in accordance with a determination result of said pixel tendency; and re-encoding means for implementing said encoding process for the decoded image signal using said intra-frame prediction mode.
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