Producing half-tone images of higher resolution through interpol

Details Producing half-tone images of higher resolution through interpol Producing half-tone images of higher resolution through interpol

1989-05-16

1991-01-29

Reynolds, Bruce A.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358456, H04N 123, H04N 140

Patent

active

049890964

ABSTRACT:
A method and apparatus for generating a half-tone version of an image represented by a first set of digital data defining the colour content of abutting pixels of the image at a first resolution. The apparatus comprises a radiation beam generator (8); a recond medium support (11), wherein the radiation beam and the support are relatively moveable such that the radiation beam scans a record medium (10) mounted on the support in a series of abutting scan lines; a radiation beam modulator (7) for modulating the radiation beam in response to a control signal (CS); and a control signal generator (5) for generating the control signal. The radiation beam is modulated selectively to expose a record medium on the support (11) at a second, finer resolution, the control signal generator (5) being adapted to interpolate the second set of digital data from the first set of digital data and to generate the control signal by comparing the second set of digital data with half-tone information.

REFERENCES:
patent: 4068266 (1978-01-01), Liao
patent: 4258393 (1981-03-01), Ejiri et al.
patent: 4280144 (1981-07-01), Bacon
patent: 4356555 (1982-10-01), Ejiri et al.
patent: 4644409 (1987-02-01), Fuchs
patent: 4686579 (1987-08-01), Sakamoto
patent: 4736254 (1988-04-01), Kotera
patent: 4821109 (1989-04-01), Roe
patent: 4841375 (1989-06-01), Nakajima

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