Preprocessing and postprocessing for vector quantization

Details Preprocessing and postprocessing for vector quantization Preprocessing and postprocessing for vector quantization

1992-09-01

1997-01-21

Boudreau, Leo

Image analysis

Image compression or coding

Quantization

382299, 348422, G06K 936, G06K 938, G06K 946

Patent

active

055966594

ABSTRACT:
Improved proprecessing and postprocessing for vector quantization, for example, for encoding an image. In one embodiment, the luminosity of the vectors in an image are used to determine the codes for vector quantization. In another embodiment, a median filter is performed to eliminate motion artifacts. In another embodiment, temporal filtering is applied once the difference between an earlier frame and a current frame exceeds a threshold. Embodiments are also provided for adaptive temporal filtering based on temporal "no change" blocks and their errors. Embodiments are provided for different regions of images which reference different codebooks, and regions of variable size. Embodiments are also provided for shared and variable size codebooks for different images or other data.

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