Apparatus and method for quantizing and/or reconstructing multi-

Details Apparatus and method for quantizing and/or reconstructing multi- Apparatus and method for quantizing and/or reconstructing multi-

1989-12-21

1993-05-11

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358447, 358456, 358463, H04N 140

Patent

active

052106233

ABSTRACT:
The method and apparatus of the present invention performs the quantization, sampling, and final digital image signal reconstruction in a way that reduces quantization artifacts such as contouring while retaining desired spatial (temporal) frequency response and resolution. The technique of the present invention features a spatially varying quantization step, a low pass filtering step, a second spatially varying quantization step, and a comparison step to determine the reconstructed signal.

REFERENCES:
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patent: 4821334 (1989-04-01), Ogino et al.
patent: 4858017 (1989-08-01), Torbey
patent: 4862173 (1989-08-01), Nishitani
patent: 4908876 (1990-03-01), DeForest et al.
patent: 4926268 (1990-05-01), Kawamura et al.
patent: 4969204 (1990-11-01), Melnychuck et al.
patent: 5008672 (1991-04-01), Leedy

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