Image enhancer which utilizes a lowpass filter after an outline

Details Image enhancer which utilizes a lowpass filter after an outline Image enhancer which utilizes a lowpass filter after an outline

1989-06-15

1991-07-16

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358166, H04N 5208, H04N 521

Patent

active

050329090

ABSTRACT:
According to the present invention, in an image enhancer, an output of an outline extracting circuit is transmitted through a band limiting filter for suppressing bands other than an objective frequency band to be enhanced and, thereafter, it is supplied to a noise slicing circuit for eliminating micro amplitude noises. The noises near the cut-off frequency of the filter can be more effectively suppressed and the deterioration of the waveform characteristic of the outline enhancement signal due to the filter can be also improved.

REFERENCES:
patent: 3946153 (1976-03-01), Peth et al.
patent: 3995108 (1976-11-01), Morrison
patent: 4015076 (1977-03-01), Ishiodori
patent: 4360830 (1982-11-01), Poetsch et al.
patent: 4541014 (1985-09-01), Yagi
patent: 4912551 (1990-03-01), Ozaki
patent: 4916542 (1990-04-01), Yoneda et al.
patent: 4931743 (1990-06-01), Fukuda et al.

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