Television – Bandwidth reduction system – Data rate reduction
Patent
1996-02-26
1998-03-03
Au, Amelia
Television
Bandwidth reduction system
Data rate reduction
348700, H04N 734
Patent
active
057241007
ABSTRACT:
The scene cut detector compares predicted macroblocks from an anchor image to input macroblocks from an input image on a macroblock-by-macroblock basis to generate a residual macroblock representing the difference between each predicted macroblock and each input macroblock. A variance for each residual macroblock and a variance for each input macroblock is computed after each comparison. The residual variance is compared to the input macroblock variance. Whenever the variance of the residuals macroblock exceeds the variance of the input macroblock, a counter is incremented. The scene cut detector repeats this process until each macroblock in the predicted image is compared to each input macroblock. If the count value ever exceeds a threshold level while a input image is being processed, the scene cut detector sets a scene cut indicator flag.
REFERENCES:
patent: 5377051 (1994-12-01), Lane et al.
patent: 5404174 (1995-04-01), Sugahara
patent: 5459517 (1995-10-01), Kunitake et al.
patent: 5493345 (1996-02-01), Ishikawa et al.
patent: 5532746 (1996-07-01), Chang
Au Amelia
Burke William J.
David Sarnoff Research Center Inc.
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