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Fast video codec transform implementations

  • US 20050256916A1
  • Filed: 05/14/2004
  • Published: 11/17/2005
  • Est. Priority Date: 05/14/2004
  • Status: Active Grant
First Claim
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1. A method of transform-coding media data in two-dimensional blocks using a fast transform implementation of a block transform of 8-points in at least one of the block'"'"'s dimensions based on a transform matrix represented by T 8 = [ 12 12 12 12 12 12 12 12 16 15 9 4 - 4 - 9 - 15 - 16 16 6 - 6 - 16 - 16 - 6 6 16 15 - 4 - 16 - 9 9 16 4 - 15 12 - 12 - 12 12 12 - 12 - 12 12 9 - 16 4 15 - 15 - 4 16 - 9 6 - 16 16 - 6 - 6 16 - 16 6 4 - 9 15 - 16 16 - 15 9 - 4 ] , the method comprising:

  • performing multiple stages of butterfly operations converting between an 8-point set of spatial domain co-efficients and 8-point transform domain co-efficients in the at least one 8-point dimension, the multiple stages comprising for odd transform domain co-efficients, performing a matrix multiply by the matrix, [433-2].

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