Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1981-08-27
1983-12-06
Masinick, Michael A.
Facsimile and static presentation processing
Static presentation processing
Attribute control
H04N 146
Patent
active
044196903
ABSTRACT:
A half-tone reproduction of an original image is made by exposing an output surface OS such as a film wrapped around a rotating drum to a modulated, multiple-head laser scanning beam. The modulation of each scanning beam SB, SB1 is determined by a control signal derived by generating digital position signals representing the position of the scanning beam within a half-tone dot area DA of an imaginary "electronic" screen grid SG inclined at a screen angle .beta. to a horizontal line on the output surface, each successive position x in the screen grid being computed by the repeated addition of small increments to the previous position signals, and, at each successive position, the position signals being compared with a predetermined value to detect the crossing of the border of the dot area, comparing each of the position signals with a picture signal representing the picture density at the corresponding point of the original image to be reproduced, and combining the results of the comparisons to generate the control signal. The picture signal determines the size of the dot required, and hence the position in the screen grid of the dot border DB. Its comparison with the position signals thus indicates the required output modulation. For simple "hard" dots this is an on/off modulation, with the control signal being on (1) or off (0) at successive points of the scan. The computer may, however, derive a multiple-level output modulation control signal to give "soft" dots of any shape.
REFERENCES:
patent: 4084183 (1978-04-01), Keller
patent: 4293873 (1981-10-01), Barendregt
patent: 4302770 (1981-11-01), Hubbard
patent: 4319268 (1982-03-01), Yamada
Crosfield Electronics Limited
Masinick Michael A.
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