G - Physics – 03 – B
Patent
G - Physics
03
B
95/32
G03B 27/66 (2006.01) G03B 27/58 (2006.01) H04N 1/17 (2006.01) H04N 1/40 (2006.01)
Patent
CA 1189374
-1- ABSTRACT Scanning apparatus having at least one self scanned array, together with processors for processing line, halftone or continuous tone images. A multi-speed transport carries documents to be scanned past a scanning slit where the moving document is scanned line by line by the array. Normally, scanning is carried out in high speed on the assumption that most documents are composed of lines or text and the resulting image signals processed by the line processor. During scanning, halftone and continuous tone detectors look for halftone and continuous tone images. Where halftone is found, the line is immediately rescanned at low speed and the image signals processed by the halftone processor. Thereafter, the apparatus reverts to high speed scanning. Where continuous tone images are found, the document page is rescanned at low speed with the image signals output by the scanning array processed by a continuous tone processor. To enhance operation, sub-sampling of the document page may be employed on the first high speed scanning pass.
410976
Sim & Mcburney
Xerox Corporation
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