Apparatus and method for digital halftone reproduction

Details Apparatus and method for digital halftone reproduction Apparatus and method for digital halftone reproduction

H - Electricity

04

N

178/3.1

H04N 1/40 (2006.01) B41B 19/00 (2006.01) G06T 1/00 (2006.01) H04N 1/405 (2006.01)

Patent

CA 1100411

APPARATUS AND METHOD FOR DIGITAL HALFTONE REPRODUCTION Abstract of the Disclosure Apparatus and method of producing a halftone image reproduction of a continuous tone photograph. Scanning instrument is provided to scan the photograph to be re- produced along a series of scan lines. Incremental con- trol parameters are provided in accordance with a repro- duction ratio to define predetermined scan sample points for each scan line. Control circuit is provided for controlling the scanning instrument to produce successive sets of digital sharp and unsharp gray level data signals at the predetermined scan sample points proportional to the light reflected from successive concentric sharp and unsharp areas with the sharp area at each scan sample point corresponding to the general area of a predetermined portion of a halftone cell. The successive sets of digi- tal sharp and unsharp gray level data signals are com- bined in accordance with a sharpness factor having a predetermined value in accordance with the original image being scanned to produce a succession of digital result- ant gray level data signals which are processed into halftone digital data signals and applied to a photo- sensitive material to produce a halftone image repro- duction of the continuous tone original photograph. KI9-76-010

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