Adaptive dynamic range encoding method and apparatus

Details Adaptive dynamic range encoding method and apparatus Adaptive dynamic range encoding method and apparatus

1993-12-07

1995-08-22

Britton, Howard W.

Television

Bandwidth reduction system

Data rate reduction

348419, H04N 740

Patent

active

054444870

ABSTRACT:
An adaptive dynamic range encoding method and device in which evaluation data mainly centered about the amount of the change in the spatial direction of picture data in a block is detected, and re-quantization is performed which will give a minimum value of the evaluation data. The re-quantization is performed at an optimum quantization step conforming to the picture in the block in such a manner that picture portions having the same level may remain at the same level after re-quantization. This renders it possible to eliminate quantization distortions from being produced in the reproduced picture.

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patent: 4890161 (1989-12-01), Kondo
patent: 5128963 (1992-07-01), Akagiri
patent: 5243420 (1993-09-01), Hibi
patent: 5283814 (1994-02-01), Iwahashi et al.
Kondo, T., et al., "Adaptive Synamic Range Coding Scheme For Future HDTV Digital VTR." Prodceedings of the Fourth International Workshop on HDTV: Signal Processing of HDTV,III, Turin, IT, 4th-6th Sep. 1991. Elsevier Science Pub., Amsterdam, NL, pp. 43-50.

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