Television – Bandwidth reduction system – Data rate reduction
Patent
1995-10-23
1997-07-08
Au, Amelia
Television
Bandwidth reduction system
Data rate reduction
348415, 348412, H04N 736
Patent
active
056466897
ABSTRACT:
A video signal encoder operable for distinguishing between errors resulting from a change in a video signal input to the encoder and errors resulting from ineffective quantization includes a quantized section and an unquantized section, with each section having a separate image predictor. A switch mechanism selectively provides each image predictor with a corresponding signal having a portion containing video data derived from a prior frame for use in predicting an image represented on a subsequent video frame. The signals are also provided to an image analysis unit for measuring motion of the image and for adjusting a quantization step size of a quantizer when quantization errors are detected.
REFERENCES:
patent: 5025482 (1991-06-01), Murakami et al.
patent: 5510787 (1996-04-01), Koster
patent: 5526052 (1996-06-01), Ar
Au Amelia
Lucent Technologies - Inc.
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