Method of and apparatus for eliminating interblock distortion du

Details Method of and apparatus for eliminating interblock distortion du Method of and apparatus for eliminating interblock distortion du

1989-04-05

1990-02-20

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358133, H04N 141, H04N 1415, H04N 7133

Patent

active

049031384

ABSTRACT:
Interblock distortion often appears on a boundary of pixel blocks in a reproduced image produced from compressed image data. The interblock distortion is eliminated by correcting a density distribution in the reproduced image. First, an average density (A.sub.ij) of a selected pixel block (B.sub.ij) is computed. Second, a standard deviation (.sigma..sub.ij) of a density distribution in the selected deviation is computed. If the standard deviation is equal to zero, correction value distributions (.DELTA.f.sub.m, .DELTA.f.sub.n) along a main scanning direction and a subscanning direction are obtained. Finally, corrected density distribution (f.sub.mn) is obtained as a sum of the average density and the correction value distributions.

REFERENCES:
patent: 4558350 (1985-12-01), Murakami
patent: 4581638 (1986-04-01), Chiariglione
patent: 4797944 (1989-01-01), Tanaka
patent: 4805030 (1989-02-01), Tanaka

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