Television – Image signal processing circuitry specific to television – Motion vector generation
Patent
1992-09-30
1995-06-27
Britton, Howard W.
Television
Image signal processing circuitry specific to television
Motion vector generation
348402, 348413, H04N 750
Patent
active
054284031
ABSTRACT:
In the encoding of a frame (P3) in a digitised motion picture sequence, the frame is divided into blocks (A) of pixels and a motion vector (VA) found to predicts the contents of each block A from a block (A') in a previous frame (I0). Rather than evaluate many thousands of candidate vectors to find the best motion vector (VA), relatively few candidate vectors are evaluated, based on starting vector which is the estimated motion vector for a neighbouring block (LB(A)) in the same frame. To allow parallel processing of several pixel blocks, all the blocks of one row in the current frame are assigned to one processor (DSP), and a starting vector is obtained from a block (LB(A)) previously processed by the same processor. Further starting vectors are obtained if desired from neighbouring blocks (UR(B),DR(B)) in neighbouring frames of the sequence. The candidate vectors based on a starting vector may be very few in number, or may fill an area a few percent of the full search area. The method may favor candidate vectors which are more economical to encode.
REFERENCES:
patent: 4785349 (1988-11-01), Keith
D. Le Gall, "MPEG: A Video Compression Standard for Multimedia Applications, Communication of the ACM", vol. 34, No. 4, Apr. 1991, pp. 47-58.
G. De Haan et al., "Motion Estimator For TV-picture Enhancement", Fourth Annual Workshop on HDTV, Turin, Sep. 1991.
Yang et al., "A Family of VLSI Designs for the Motion Compensation Block-Matching Algorithm", IEEE Trans. on Circuits and Systems, vol. 36, No. 10, Oct. 1989, pp. 1317-1325.
L. G. Chen et al.: "A Predictive Parallel Motion Estimation Algorithm For Digital Imaging Processing", IEEE Procc. IDDC 1991, pp. 617-620.
L. G. Chen et al., "An Efficient Paralle Motion Estimation Algorithm For Digital Image Processing", IEEE Trans. Circuits and Systems for Video Technology, vol. 1, No. 4, (Dec. 1991) pp. 378-385.
Andrew Derek
Morris Octavius J.
Britton Howard W.
Marion Michael E.
U.S. Philips Corporation
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