Image forming apparatus for forming an image according to magnif

Details Image forming apparatus for forming an image according to magnif Image forming apparatus for forming an image according to magnif

1989-12-22

1992-01-21

Ng, Jin F.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

H04N 140

Patent

active

050832166

ABSTRACT:
A photoelectric converter reads the image of a document line by line. A magnification setting key provided on an operation panel serves to set the copying magnification. When an enlarged magnification is set by the magnification setting key, a magnification processor produces density data of an image to be output, by means of a linear interpolation method, from the image read by the photoelectric converter. When a reduced magnification is set by the magnification setting key, the magnification processor produces density data of the image to be output, by means of a projection method, from the image read by the photoelectric converter. A thermal head transfers ink from an ink ribbon onto a sheet of paper, in accordance with the image density data output from the magnification processor.

REFERENCES:
patent: 4381547 (1983-04-01), Ejiri
patent: 4792856 (1988-12-01), Shiratsuchi
patent: 4809345 (1989-02-01), Tabata et al.
patent: 4872064 (1989-10-01), Tutt et al.
patent: 4930021 (1990-05-01), Okada
patent: 4933775 (1990-06-01), Shimura

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