Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1986-12-12
1988-09-06
Coles, Sr., Edward L.
Facsimile and static presentation processing
Facsimile
Recording apparatus
358285, 358287, 358299, H04N 140
Patent
active
047697172
ABSTRACT:
This disclosure relates to an image reproduction apparatus for reproducing images through laser beam scanning using galvano mirrors. The apparatus includes a memory device which stores an image signal in an image signal memory in accordance with a grid clock signal; a reading/processing/writing device which reads the image signal from the image signal memory, performs image processing, and writes the processed image signal into a processed image signal memory in accordance with the clock signal from another clock generator; and a reading device which reads the processed image signal from the processed image signal memory in accordance with the grid clock signal. The image signal picked up through the scanning of the laser beam is deflected by the galvano mirrors and is first amplified and processed as needed, and then it is converted to the digital signal by an A/D converter, and the digital signal is stored in the image signal memory device in accordance with the grid clock signal. Next, in accordance with the clock signal from a different, more stable clock generator, such as a crystal oscillator, the image signal read from the image signal enhancement memory undergoes tone correction, image enhancement, making halftone, enlargement, reduction, or any other necessary image processing, and then the processed signal is stored in a processed image signal memory device. Next, the image reproduction device reads the processed image signal from the processed image signal memory and outputs it.
REFERENCES:
patent: 4205350 (1980-05-01), Gunning
patent: 4233636 (1980-11-01), Harbaugh et al.
patent: 4561024 (1985-12-01), Tamura
patent: 4651225 (1987-03-01), Yamada
patent: 4679096 (1987-07-01), Nagashima
patent: 4710821 (1987-12-01), Ohta
Patent Abstract of Japan "Deflecting Device of Laser Scan", No. 56-146359 (A); date: 11-1981; Inv. Yukio Sakai; Assignee: Matsushita Denki Sangyo K.K.
Coles Sr. Edward L.
Leo Giken Co., Ltd.
Sakata Shokai Ltd.
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