Television – Bandwidth reduction system – Data rate reduction
Patent
1994-08-30
1998-01-13
Lee, Richard
Television
Bandwidth reduction system
Data rate reduction
348699, 382244, H04N 732
Patent
active
057084734
ABSTRACT:
Methods and systems for encoding data representative of a sequence of video frames for transmission to a decoder. A motion compensated predictive coder (24) substantially losslessly compresses the data, computes a motion vector, and forms an intermediate coded representation which includes the compressed data and the motion vector. A frame detector (26), which detects frames having a prediction error which exceeds a predetermined threshold, is coupled to the motion compensated predictive coder (24). A digital storage device (22) is coupled to the motion compensated predictive coder (24) and the frame detector (26). The digital storage device (22) stores the intermediate coded representation and stores a representation of the frames having the prediction error which exceeds the predetermined threshold. A lossless decoder (29), coupled to the digital storage device (22), substantially losslessly decodes the intermediate coded representation to form a decoded representation. A recoder (28), which compresses the decoded representation at a compression ratio in dependence upon a selectable bit rate for transmission, is coupled to the digital storage device (22) and the lossless decoder (29).
REFERENCES:
patent: 4661849 (1987-04-01), Hinman
patent: 4849810 (1989-07-01), Ericsson
patent: 5267334 (1993-11-01), Normille et al.
patent: 5283646 (1994-02-01), Bruder
patent: 5309232 (1994-05-01), Hartung et al.
patent: 5367385 (1994-11-01), Yuan
patent: 5414469 (1995-05-01), Gonzales et al.
Denson-Low W. K.
Gudmestad T.
Hughes Aircraft Company
Lee Richard
Price P. Y.
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