Television – Bandwidth reduction system – Data rate reduction
Patent
1993-10-22
1995-06-06
Britton, Howard W.
Television
Bandwidth reduction system
Data rate reduction
348407, H04N 7133, H04N 7137
Patent
active
054226767
ABSTRACT:
A hybrid Discrete Cosine Transform (DCT) coder processes blocks of (e.g., 8.times.8) pixels from interlaced or progressive scanned image signals. Processing of image lines by the coder is modified in the presence of image motion to avoid switching between 8.times.8 and 2.times.(4.times.8) transformations. For motion, the lines of two vertically superimposed image blocks are rearranged to produce first and second modified blocks. The modified first block contains pixels from lines in a first field, and the modified second block contains pixels from lines in an associated adjacent second field.
REFERENCES:
patent: 4849812 (1989-07-01), Borgers et al.
patent: 5091782 (1992-02-01), Krause et al.
W. Jass et al., "A Hybrid DCT-Coder with Local Adaptivity for the Interlaced HDTV-Transmission with 140 Mbit/s", Proceedings of the SPIE Image Processing Algorithms and Techniques, Feb. 12-14, 1990, pp. 378-388.
R. Kutra, Block Adaptive Frame/Field DCT Coding Decided by the Vertical Difference Test, Proceedings of the Third International Workshop on HDTV, Aug. 30-Sep. 1, 1989, pp. 739-748.
P. Vogel, Videobild auf der Datenleitung, Funkschau, vol. 60, No. 26, Dec. 16, 1988, pp. 60-63.
DeWith, P. H. N., Motion-Adaptive Intraframe Transform Coding of Video Signals, Philips Journal of Research, vol. 44, No. 2/3, pp. 345-364, FIG. 3.
Ericsson, S., Fixed and Adaptive Predictors for Hybrid Predictive/Transform Coding, IEEE Transactions on Communications, vol. COM-33, No. 12, Dec. 1985.
Kamangar, F. A. et al., Interfield Hybrid Coding of Component Color Television Signals, IEEE Transactions on Communications, vol. COM-29, No. 12, Dec. 1981, pp. 1740-1753.
Progressive Picture Transmission Using Interleaved Blocks, Electronics Letters, 5 Dec. 1985, vol. 21, No.25/26, pp. 1181-1182, FIG. 1.
Herpel Carsten
Keesen Heinz-Werner
Britton Howard W.
Deutsche Thomson-Brandt GmbH
Herrmann Eric P.
Kurdyla Ronald H.
Tripoli Joseph S.
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