Image processing apparatus which converts m-bit image data to n-

Details Image processing apparatus which converts m-bit image data to n- Image processing apparatus which converts m-bit image data to n-

1988-12-12

1990-05-15

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358298, 358456, H04N 140

Patent

active

049262688

ABSTRACT:
An image processing apparatus of this invention includes a digital data output device for outputting bi-level image data, a bi-level processor for converting the bi-level image data into multi-level (e.g., 8-bit) image data, a multi-level processor for performing spatial filter processing with respect to the multi-level image data output from the bi-level processor, and a PWM circuit for processing the multi-level image data output from the multi-level processor using a pattern signal of a predetermined cycle and generating a PWM signal.

REFERENCES:
patent: 3848087 (1974-11-01), Carrell
patent: 4004079 (1977-01-01), Boston
patent: 4032977 (1977-06-01), Liao
patent: 4194221 (1980-03-01), Stoffel
patent: 4259694 (1981-03-01), Liao
patent: 4496989 (1985-01-01), Hirosawa
patent: 4541116 (1985-09-01), Lougheed
patent: 4638369 (1987-01-01), Hsieh
patent: 4698688 (1987-10-01), Ochi et al.
patent: 4698691 (1987-10-01), Suzuki et al.
patent: 4763199 (1988-08-01), Suzuki
patent: 4782398 (1988-11-01), Mita
patent: 4782399 (1988-11-01), Sato
patent: 4800442 (1989-10-01), Riseman et al.
patent: 4803558 (1989-02-01), Hiratsuka et al.
patent: 4811037 (1989-03-01), Arai
patent: 4819066 (1989-04-01), Miyagai
patent: 4831392 (1989-05-01), Dei
patent: 4847654 (1989-07-01), Honma et al.
patent: 4847695 (1989-07-01), Arai
A. L. Mix, Jr., et al., "Gray Scale to Pseudo Halftone Conversion", IBM Technical Disclosure Bulletin, vol. 20, No. 1, Jun. 1977, pp. 31-32.
Yoshihiro Miyamoto, Abstract for Japanese Kokai 56-91585, Patent Abstracts of Japan, vol. 5, No. 163 (E-78) [835], Oct. 20, 1981.
Hiroyoshi Tsuchiya, "Bilevel Representation of Continuous-Tone Images", National Convention Record, 1985, The Institute of Electronics and Communications Engineers of Japan, Mar. 27-30, 1985, 5-212, p. 1384.

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