Image processor for smoothing and differentiating periodic areas

Details Image processor for smoothing and differentiating periodic areas Image processor for smoothing and differentiating periodic areas

1995-12-19

1997-11-04

Frahm, Eric

Facsimile and static presentation processing

Facsimile

Recording apparatus

358448, 358454, 358462, 358530, 358533, 382266, H04N 140, H04N 146, G06K 936

Patent

active

056846002

ABSTRACT:
An image processor performs emphasis processings suitable for materials to be copied to produce clear copy outputs. The image processor has a digitizing circuit which outputs a digital signal produced by digitizing an image. The processor further has a first detecting circuit which detects an area of the digital signal including a periodic component, a second detecting circuit which detects a character area of the digital signal, and a smoothing circuit which smoothes the digital signal to output a smoothed signal. Either the digital signal or the smoothed signal is selected and outputted by a changeover circuit according to an output of the first detecting circuit. The output of the changeover circuit is differentiated into a plurality of differentiated signals by a differentiating circuit by use of a plurality of different coefficients. One of the differentiated signals is selected and outputted according to the outputs of the first and second detecting circuits.

REFERENCES:
patent: 5029227 (1991-07-01), Kawamura
patent: 5134667 (1992-07-01), Suzuki
patent: 5231677 (1993-07-01), Mita et al.

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