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Spatial and temporal filtering mechanism for digital motion video signals

  • US 6,281,942 B1
  • Filed: 08/11/1997
  • Issued: 08/28/2001
  • Est. Priority Date: 08/11/1997
  • Status: Expired due to Term
First Claim
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1. A method for filtering at least a portion of a digital video signal, the method comprising:

  • calculating a pixel variance for a block of source pixels from a current frame of the motion video image;

    applying a heavy spatial filter to the block of source pixels to form a block of spatially filtered pixels representing current subject matter of the current frame when the pixel variance is less than a first pixel variance threshold;

    applying a light spatial filter to the block of source pixels to form the block of spatially filtered pixels when the pixel variance is less than a second pixel variance threshold;

    calculating a pixel error between the block of spatially filtered pixels and a block of pixels of a previous frame of the digital video signal;

    applying a heavy temporal filter to the block of spatially filtered pixels when the pixel error is less than a first pixel error threshold; and

    applying a light temporal filter to the block of spatially filtered pixels when the pixel error is less than a second pixel error threshold.

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