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2-D transforms for image and video coding

  • US 20030206582A1
  • Filed: 02/28/2003
  • Published: 11/06/2003
  • Est. Priority Date: 05/02/2002
  • Status: Active Grant
First Claim
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1. A method of encoding media data, comprising:

  • for a two dimensional block of the media data, performing a forward transform of the block to convert the block into a transform domain, quantizing the transform-domain block;

    dequantizing the transform-domain block; and

    performing an inverse transform of the transform-domain block to produce a reconstructed block, the inverse transform being implemented as a sequence of matrix multiplications by a transform matrix composed of integer numbers conforming within a predetermined tolerance to certain constraints, the constraints comprising a scaled integer constraint, a perfect reconstruction constraint, a DCT-like basis constraint, and an integer range limitation constraint.

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