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Transform coding of dense motion vector fields for frame and object based video coding applications

  • US 5,959,673 A
  • Filed: 06/04/1996
  • Issued: 09/28/1999
  • Est. Priority Date: 10/05/1995
  • Status: Expired due to Term
First Claim
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1. A compression method of representing changes between corresponding pixels in first and second video image frames, comprising:

  • determining motion vectors for all pixel locations in each region in a set of regions of the first video image frame by estimating the motion of all of the pixels in each region relative to pixels in the second video image frame;

    wherein the regions correspond to regions of a first image feature having a non-rectangular boundary in the first image frame and the motion vectors for at least one of the regions represent a motion vector field having a non-rectangular shape corresponding to the boundary of the first image feature;

    transforming the motion vector field having a non-rectangular shape to a motion vector field of rectangular configuration for encoding in the first compressed format, where the rectangular configuration comprises a two dimensional array of motion vectors, and transforming the motion vector field includes assigning motion vectors to pixel locations within the rectangular configuration but not overlapping the non-rectangular shape of the motion vector field; and

    encoding the motion vectors for each of the regions in a first compressed format to produce compressed motion vectors for each region, including transforming the motion vectors for each region into spatial frequency components and transforming the motion vectors for each pixel location in the rectangular configuration into spatial frequency components.

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