Image magnification and demagnification system

Details Image magnification and demagnification system Image magnification and demagnification system

1980-03-07

1982-12-28

Ng, Jin F.

Facsimile and static presentation processing

Facsimile

Recording apparatus

332 19, 358 77, H04N 104

Patent

active

043665080

ABSTRACT:
A control system for controlling the size of the image produced by pixels generated by a raster scanner employing a binary rate multiplier for image size control along the X-axis, the multiplier being programmed to the size image desired to vary the frequency of the pixel clock signals output by the multiplier, together with a control flip-flop astride the image pixel stream and driven by the multiplier clock signals to speed up or reduce the rate at which image pixels are output. For image size control along the Y-axis, a phase lock loop is provided for controlling scanning carriage speed in response to the frequency of the signals output by a programmable frequency generator.

REFERENCES:
patent: 3541245 (1970-11-01), Wilby
patent: 3582549 (1971-06-01), Hell et al.
patent: 4017719 (1977-09-01), Kaplan et al.
patent: 4027274 (1977-05-01), Fukui et al.
patent: 4066978 (1978-01-01), Cox, Jr. et al.
patent: 4113378 (1978-09-01), Wirtz
patent: 4169275 (1979-09-01), Gunning

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