Image processing device for producing a variable period pulse-wi

Details Image processing device for producing a variable period pulse-wi Image processing device for producing a variable period pulse-wi

1995-06-29

1998-07-21

Coles, Sr., Edward L.

Image analysis

Image compression or coding

Gray level to binary coding

358456, 358462, H04N 140, G06K 946

Patent

active

057844950

ABSTRACT:
A period determination signal is generated in accordance with the image type of an input image signal. A clock signal having one of a plurality of periods is generated in accordance with the period determination signal. A CR integration circuit having a resistor and at least one capacitor generates a triangular-wave signal based on the clock signal. The combined capacitance of the CR integration circuit is changed in accordance with the period determination signal. A pulse-width modulated binary image signal is produced by comparing the triangular-wave signal with the input image signal. The amplitude of the triangular signal is kept constant by changing the combined capacitance of the CR integration circuit in proportion to the period of the clock signal.

REFERENCES:
patent: 4138654 (1979-02-01), Luhowy
patent: 4786863 (1988-11-01), Milkovic
patent: 4819066 (1989-04-01), Miyagi
patent: 5148287 (1992-09-01), Kemmochi et al.
patent: 5495278 (1996-02-01), Oda et al.
patent: 5495341 (1996-02-01), Kawana et al.

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