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Fast DCT domain downsampling and inverse motion compensation

  • US 5,708,732 A
  • Filed: 03/06/1996
  • Issued: 01/13/1998
  • Est. Priority Date: 03/06/1996
  • Status: Expired due to Term
First Claim
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1. A method for downsampling image information in the compressed domain, where such information has been compressed in accordance with a discrete cosine transform (DCT) based compression scheme, the method comprising the steps of:

  • Huffman decoding a compressed bitstream to extract a plurality of N×

    N DCT-based data blocks;

    processing n of said data blocks in accordance with at least one sampling matrix to extract a single N×

    N DCT-based data block, wherein n is determined by a desired downsampling factor, and wherein said single data block is a determined average of said N data blocks.

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