Quantization adaptive to the human visual system

Details Quantization adaptive to the human visual system Quantization adaptive to the human visual system

1994-02-18

1996-06-11

Tran, Thai Q.

Television

Bandwidth reduction system

Data rate reduction

348420, H04N 724

Patent

active

055260527

ABSTRACT:
An adaptive quantizing apparatus and method in HDTV according to the invention is capable of modifying a quantization spacing for the individual blocks to be processed in accordance with the human visual system, such as motion, complicatedness, brightness, etc. of a picture. To this end, a picture portion which is prone to present any conspicuous visual undesirable effects is tracked down and assigned a modified bit rate so that a bit rate is lowered for a picture portion where such undesirable effects, if they occur, should not be very conspicuous, decreasing the probability of enhancing the subject picture quality.

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patent: 5245427 (1993-09-01), Kunihiro
patent: 5285276 (1994-02-01), Citta
patent: 5307163 (1994-04-01), Hatano et al.
patent: 5315326 (1994-05-01), Sugiyama
patent: 5317397 (1994-05-01), Odaka et al.
patent: 5337087 (1994-08-01), Mishima
patent: 5347311 (1994-09-01), Golin

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