Television – Bandwidth reduction system – Data rate reduction
Patent
1995-01-30
1997-08-19
Britton, Howard W.
Television
Bandwidth reduction system
Data rate reduction
348416, 348424, H04N 746
Patent
active
056593635
ABSTRACT:
A video signal coding apparatus for coding first and second input video images comprises a motion vector generator for matching pixels of the second input image B with pixels of the first input image A to derive motion vectors representing the motion of pixels in the second image between the two images, each motion vector being associated with the location of a pixel in the second image B and the location of the matched pixel in the first image A. The apparatus includes an encoder for processing the two input images A, B to produce first and second output video images C, D, pixels of the first output image C being produced by addition of equally weighted pixels in the two input images A, B, and pixels of the second output image D being produced by subtraction of equally weighted pixels in the two input images A, B. A coding controller controls the encoder in dependence upon the motion vectors such that each said pixel of the first output image C is produced by addition of the co-sited pixel in the first input image and its matched pixel in the second input image as determined by the associated motion vector, and each said pixel of the second output image D is produced by subtracting the co-sited pixel in the second input image from its matched pixel in the first input image as determined by the associated motion vector. A complementary decoding apparatus is also provided for decoding input images coded by the coding apparatus. The coding and decoding apparatus can be applied for temporal sub-band frequency separation and reconstruction of video signals in video compression and decompression processes.
REFERENCES:
patent: 5272530 (1993-12-01), Cassereau
Britton Howard W.
Frommer William S.
Sinderbrand Alvin
Sony Corporation
Sony United Kingdom Limited
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