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Methods and apparatus for video size conversion

  • US 7,676,106 B2
  • Filed: 07/03/2003
  • Issued: 03/09/2010
  • Est. Priority Date: 06/09/2000
  • Status: Active Grant
First Claim
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1. A method for performing 2:

  • 1 downscaling on video data, comprising the steps of;

    forming at least one input matrix of N×

    N Discrete Cosine Transform (DCT) coefficients from the video data by combining four N/2×

    N/2 field-mode DCT blocks;

    performing vertical downsampling and de-interlacing to the input matrix to obtain two N/2×

    N/2 frame-mode DCT blocks;

    forming an N×

    N/2 input matrix from the two frame-mode DCT blocks; and

    performing horizontal downsampling to the N×

    N/2 matrix to obtain one N/2×

    N/2 frame-mode DCT block.

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