Image signal processing apparatus

Details Image signal processing apparatus Image signal processing apparatus

1989-11-15

1991-10-08

Orsino, Joseph A.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358447, 358461, 358464, 358466, 382 50, H04N 140

Patent

active

050559443

ABSTRACT:
According to an image signal processing apparatus in accordance with the present invention, an input signal is converted to a digital image signal and then the digital image signal is cyclicly shifted. Therefore, a desired signal component can be collected on a first or second level side. Therefore, a signal can be divided into bilevels in reference to one threshold value or it can be divided into multiple levels in reference to a plurality of threshold values. As a result, it is possible to precisely extract contours of the image signal even if there is a small density difference between a background signal and an information signal. In addition, a background can be converted between white and black.

REFERENCES:
patent: 4466123 (1984-08-01), Arai et al.
patent: 4553173 (1985-11-01), Kawamura
patent: 4554583 (1985-11-01), Saitoh et al.
patent: 4562486 (1985-12-01), Suzuki et al.
patent: 4691240 (1987-09-01), Kurusu et al.
patent: 4723173 (1988-02-01), Tanioka
patent: 4783836 (1988-11-01), Takashima

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