Television – Bandwidth reduction system – Data rate reduction
Patent
1996-07-11
1998-09-22
Au, Amelia
Television
Bandwidth reduction system
Data rate reduction
348699, H04N 736
Patent
active
058121994
ABSTRACT:
A system for estimating block motion from a previous frame to a current frame, wherein motion vectors have been computed for blocks in the previous frame. The system comprises a P-checkerboard processor, an S-checkerboard processor and a block matching engine. The a P-checkerboard processor selects a first current block from a primary checkerboard pattern, retrieves motion vectors for reference blocks in the previous frame, and uses the retrieved motion vectors to generate a temporal search window. The block matching engine locates in the temporal search window a block which best matches the first current block, and determines the current motion vector from the best matching block to the first current block. Alternatively, the a P-checkerboard processor can use the retrieved motion vectors to interpolate the current motion vector. The S-checkerboard processor selects a second current block from a secondary checkerboard pattern, and uses the current motion vector to generate a spatial dynamic search window. The block matching processor locates in the spatial search window the block which best matches the second current block, and determines the current motion vector from the best matching block to the second current block.
REFERENCES:
Bede Liu and Andre Zaccarin, "New Fast Algorithms for the Estimation of Block Motion Vectors," IEEE Transactions On Circuits And Systems For Video Technology, vol. 3, No. 2, Apr. 1993, pp. 148-157.
A. Murat Tekalp, "Block-Based Methods," Digital Video Processing, 1995, pp. 95-116.
International Telecommunication Union, "Line Transmission of Non-Telephone Signals--Video Coding For Low Bitrate Communication," Draft H.263, Dec. 5, 1995, pp.1-52.
Chu Ke-Chiang
Lu Jian
Tian Yu Tina
Wu Hsi-Jung
Apple Computer Inc.
Au Amelia
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