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Rapid production of reduced-size images from compressed video streams

  • US 7,471,834 B2
  • Filed: 02/10/2003
  • Issued: 12/30/2008
  • Est. Priority Date: 07/24/2000
  • Status: Active Grant
First Claim
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1. A method for producing reduced-size images from a video stream, comprising:

  • selecting a reduced set of transform coefficients from each of a plurality of macroblocks by discarding higher-frequency coefficients in response to a reduction factor; and

    performing an inverse transformation and field separation process on the selected coefficients to produce reduced-size top-field and bottom-field image blocks.

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