| 摘要 |
A video reproducing apparatus which prevents a degradation in the picture quality by utilizing difference codes which have been added as additional information in coding process based DCT coding. Each of the taken-in codes has its header analyzed by a header analyzer 11, is decoded in a decoder 12, inverse-quantized in an inverse quantizer 13, and inverse-DCTed in an IDCT stage 14, thus yielding expanded pictures. If additional information has been added, the information is read by an additional information reader 21, the read difference codes contained in the extra information are expanded by an additional information decoder 22. The expanded difference code and video data from the IDCT stage 14 are synthesized by a video synthesizer 23 to yield high definition video data.
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