Television – Bandwidth reduction system – Data rate reduction
Patent
1992-12-01
1994-05-10
Britton, Howard W.
Television
Bandwidth reduction system
Data rate reduction
348699, 348607, H04N 7133, H04N 7137
Patent
active
053113101
ABSTRACT:
Our overlapped motion compensation unit and method, which is a motion compensation mechanism employing an overlapped block structure, minimize blocking effects prevalent in convention motion compensation. Our overlapped motion compensation unit and method are implemented on the basis of analysis/synthesis filter banks employed for coding resulting in compatibility between the block structure used for motion compensation and for coding. Our encoder, decoder, and coding method employ our novel overlapped motion compensation technique in combination with analysis/synthesis filter banks such as LOT to achieve improvements in coding efficiency and image quality above that of conventional image coders and coding methods. Specifically, in our encoder, decoder, and coding method, blocking effects prevalent in coders employing conventional motion compensation techniques and discrete cosine transforms are minimized and coding efficiency and image quality are maximized.
REFERENCES:
patent: 5136376 (1992-08-01), Yagasaki
"Coding for Moving Pictures and Associated Audio," ISO/IEC JTC 1/SC 29 N 071 pp. 2-A-18, Dec. 6, 1991.
"Lapped Transform for Efficient Transform/Subband Coding," H. S. Malvar IEEE Trans. Acoustics, Speech, and Signal Processing, vol. ASSP-38, No. 6, pp. 969-978, Jun. 1990.
"Perfect Reconstruction FIR Filter Banks: Some Properties and Factorization," M. Vetterli and D. LeGall, IEEE Trans. ASSP, vol. ASSP-37, No. 7, pp. 1057-1071, Jul. 1989.
"The LOT: Transform Coding without Blocking Effects," H. S. Malvar and D. H. Staelin IEEE Trans. ASSP vol. ASSP-37, No. 4, pp. 553-559, Apr. 1989.
Codec for Audiovisual Services at n.times.384 kbit/s, Rec. H.261, pp. 120-128, 1988.
"Analysis/Synthesis Filter Bank Design Based on Time Domain Aliasing Cancellation," J. P. Princen and A. B. Bradley IEEE Trans. on Acoustics, Speech, and Signal Processing, vol. ASSP-34, No. 5, pp. 1153-1161, Oct. 1986.
Jozawa Hirohisa
Singhal Sharad
Watanabe Hiroshi
Bell Communications Research Inc.
Britton Howard W.
Suchyta Leonard Charles
Yeadon Loria B.
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