Image processing apparatus

Details Image processing apparatus Image processing apparatus

1987-08-04

1989-09-05

Shaw, Clifford C.

Facsimile and static presentation processing

Facsimile

Recording apparatus

3461531, 346160, 358296, 358302, 358298, 358456, G01D 1514, H04N 140, H04N 129

Patent

active

048644196

ABSTRACT:
There is disclosed an apparatus for obtaining image signal by tonal processing of an input signal. Pulse-width modulation of the input signal is achieved thorugh comparison with a second signal of a predetermined shaped, for example a triangular signal. In order to avoid the influence of fluctuating factors in pulse-width modulation, the apparatus also has a third signal generator, and the pulse-width modulated signal or a pattern signal generated by the third signal generator is selectively used for image formation.

REFERENCES:
patent: 3965290 (1976-06-01), Tisue
patent: 4040094 (1977-08-01), Everett et al.
patent: 4278347 (1981-07-01), Okamoto et al.
patent: 4680646 (1987-07-01), Ikeda
patent: 4697910 (1987-10-01), Kasuya
patent: 4709250 (1987-11-01), Takeuchi

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