Block matching for picture motion estimation using offset quanti

Details Block matching for picture motion estimation using offset quanti Block matching for picture motion estimation using offset quanti

1995-04-10

1997-03-18

Tran, Thai Q.

Television

Bandwidth reduction system

Data rate reduction

348415, H04N 724

Patent

active

056127464

ABSTRACT:
Block matching for picture motion estimation uses offset quantized pixel values. The pixels of a reference block from a first frame of a video picture sequence are offset quantized to produce a pair of offset quantized reference pixel signals. The pixels of a search area from a next frame of the video picture sequence, corresponding to a current position of the reference block relative to the search area, the search area being larger than the reference block, are quantized to produce a quantized search pixel signal. The quantized search pixel signal is compared with each of the offset quantized reference pixel signals on a pixel by pixel basis to determine whether absolute equality exists between the respective pairs of pixel signals. The comparison results are combined so that for each quantized pixel of the search block that has absolute equality with either offset quantized reference pixel signal, a tally count is incremented. The process is repeated for each possible position of the reference block within the search area, and the portion of the search area having the greatest tally count is deemed to be the new position of the reference block in the second frame. From the new position appropriate motion estimation vectors may be determined.

REFERENCES:
patent: 5091782 (1992-02-01), Krause et al.
patent: 5440346 (1995-08-01), Alattar et al.

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