Image signal processing apparatus producing a narrowed pulse wid

Details Image signal processing apparatus producing a narrowed pulse wid Image signal processing apparatus producing a narrowed pulse wid

1991-01-18

1994-03-01

Moore, David K.

Image analysis

Histogram processing

For setting a threshold

358447, 307266, 307358, 328 58, 332109, H03K 5153, H03K 504, H03K 3017, G06K 964

Patent

active

052915620

ABSTRACT:
An image signal processing apparatus including an image signal output device activated in synchronism with a pixel synchronizing signal for outputting therefrom an image signal which defines, as a variable region, a d.c. level formed between a first d.c. level and a second d.c. level exceeding the first d.c. level, a triangle-shaped wave signal generator activated in synchronism with the pixel synchronizing signal for outputting therefrom a triangle-shaped wave signal which defines, as a variable region, a d.c. level formed between a third d.c. level less than the first d.c. level and the second d.c. level, and a comparator supplied with the image signal and the triangle-shaped wave signal so as to output a pulse-width modulated signal therefrom.

REFERENCES:
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patent: 4251821 (1981-02-01), Kimura
patent: 4847654 (1989-07-01), Honma et al.
patent: 4864326 (1989-09-01), Kawamura et al.
patent: 4864419 (1989-09-01), Saito et al.
"A 32-bit CMOS Microprocessor with On-Chip Cache and TLB", IEEE Journal of Solid-State Circuits, vol. SC-22, No. 5, pp. 800-807.
Introduction to VLSI Systems, pp. 26-29.

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