Television – Bandwidth reduction system – Data rate reduction
Patent
1993-11-04
1995-12-05
Britton, Howard W.
Television
Bandwidth reduction system
Data rate reduction
348402, 348413, 348699, H04N 732
Patent
active
054733790
ABSTRACT:
A novel method and apparatus for use in digital video compression provides improved block-based motion compensation using the global motion of a video frame. A video frame comprising a plurality of blocks may be compressed for transmission using block motion vectors. Motion vectors are generated by block matching a block to be coded with a block within a reference frame and determining the displacement therebetween. To effect block matching, motion compensation techniques define a search window within one or more reference frames within which a displaced block will be found. According to the present invention, the location of the search window within a reference frame is defined using the global motion of the frame.
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patent: 5247355 (1993-09-01), Frederiksen
M. Bierling, "Displacement Estimation By Hierarchical Blockmatching," Visual Communications and Image Processing '88, Proceedings of the International Society for Optical Engineering, vol. 1001, Part 2 of 2, pp. 942-951, Nov. 9-11, 1988.
Jaswant R. Jain and Anil K. Jain, "Displacement Measurement And Its Application In Interframe Image Coding," IEEE Transactions on Communications, vol. COM-29, No. 12, pp. 1799-1808, Dec. 1981.
R. Srinivasan and K. R. Rao, "Predictive Coding Based On Efficient Motion Estimation," Links For The Future: Science, Systems and Services for Communications, Proceedings of the International Conference on Communications--ICC [84, pp. 521-526, May 14-17, 1984.
Q. Wang and R. J. Clarke, "Motion Estimation And Compensation For Image Sequence Coding," Image Communication, vol. 4, No. 2, pp. 161-174, Apr. 1992.
AT&T Corp.
Britton Howard W.
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