| 摘要 |
PROBLEM TO BE SOLVED: To provide format conversion that is achieved by operation in a DCT region. SOLUTION: A DCT macroblock (MB) contained in an MPEG bit stream is divided into a plurality of microblocks (B1, B2, B3, and B4) each. After an important frequency component in each of DCT blocks (B1, B2, B3, and B4) is identified and stored, microblocks (mB1, mB2, mB3, and mB4) at the corresponding upper left portion are separated, and the coefficients of other microblocks are set to zero. Inverse discrete cosine conversion (16) is carried out to the separated microblocks (nB1, mB2, mB3, and mB4), and a merged block is generated by merging with the microblock obtained from other DCT blocks contained in each macroblock (MB). Discrete cosine conversion (20) is performed to the obtained merged block, and assembly is carried out to the macroblock (MBD) of the converted format for obtaining a final block. COPYRIGHT: (C)2003,JPO |
