| 摘要 |
<p>An MPEG video decoder adapted to decode an incoming MPEG coded video data stream to form decoded MPEG video data and to reconstruct from the decoded MPEG video data a raw video signal, utilizes: an nxn block of decoded video data DCT values forming an original matrix having a non-zero value in a preselected corner location in the matrix; and comprises a modified matrix forming apparatus adapted to form a modified matrix having the same content as the original matrix with the exception of a zero in the preselected corner value position; a dummy matrix forming apparatus adapted to form a dummy matrix having zero in each of its matrix positions with the exception of the preselected corner position; an IDCT apparatus adapted to perform an IDCT algorithm on the modified matrix and the dummy matrix; and an adder which adds the IDCT of the modified matrix and the dummy matrix to produce the IDCT for the original matrix. The matrix may be the typical, 8x8 MPEG block. The IDCT for the dummy matrix may be precomputed and stored and added to each IDCT of each modified matrix.</p> |
