Dequantization using decrements and multiply

Details Dequantization using decrements and multiply Dequantization using decrements and multiply

1994-08-26

1995-11-21

Chin, Tommy P.

Television

Image falsification to improve viewer perception of...

Quantizer

348405, H04N 724

Patent

active

054692083

ABSTRACT:
A dequantization device is provided for receiving input quantized data values and providing output dequantized data values. A conditional decrement device receives the input quantized data values and conditionally decrements the input data values according to determinations made with respect to the input data values. The conditionally decremented values are applied to a multiplication device which multiplies them by a quantization factor. The output of the multiplication device is applied to a second conditionally decrementing device wherein the multiplication output is decremented according to determinations with respect to the input quantized data value and the quantization factor. The output of the further conditional decrementing device is representative of the output dequantized data values. In this manner, dequantization is performed using only two decrements and a multiply.

REFERENCES:
patent: 4862173 (1989-08-01), Nishitani
patent: 5144426 (1992-09-01), Tanaka et al.
patent: 5196933 (1993-03-01), Henet
patent: 5251028 (1993-10-01), Iu
patent: 5251029 (1993-10-01), Enari et al.
patent: 5274443 (1993-12-01), Dachiku et al.
patent: 5329318 (1994-07-01), Keith

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