Television – Bandwidth reduction system
Patent
1992-03-05
1994-05-17
Chin, Tommy
Television
Bandwidth reduction system
348405, 348416, 348417, 348613, H04N 7133, H04N 7137
Patent
active
053132980
ABSTRACT:
A companding technique takes advantage of spatial masking in order to avoid problems from noise and/or distortion introduced when storing or transmitting video signals. A forward companding or encoding part of the technique divides a video frame into separate portions. A local average is calculated for each portion. For each pixel or picture element within a portion, the average of that portion is subtracted and the result is subjected to a non-linear forward process which emphasizes those video signals which are close to the local average and which de-emphasizes those video signal portions which are relatively different from the local average. An encoded output is applied to a medium and, upon recovery from the medium, the recovered signal is subjected to a decode process including a non-linear reconstruction process which is the inverse of the non-linear process applied at the encode stage. The compand process may be used in combination with known video data compression techniques such as transform and quantization techniques, predictive coding, and vector quantization. It may also be used with known image motion compensation techniques.
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Chin Tommy
Lee Richard
Rubin, Bednarek and Associates, Inc.
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