Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1981-09-10
1984-05-08
Martin, John C.
Facsimile and static presentation processing
Facsimile
Recording apparatus
358288, H04M 712
Patent
active
044478305
ABSTRACT:
Scanning apparatus having at least one self scanned array; a multispeed transport for carrying documents to be scanned past a scanning slit where the moving document is scanned line by line by the array at high speed on the assumption that most documents are composed of lines or text; processing the image signals produced by a line processing means; while scanning, using halftone and continuous tone detectors to look for halftone and continuous tone images respectively; where halftone images are detected, rescanning the line at low speed and processing the resulting image signals by a halftone processing means and thereafter reverting to high speed scanning; and where continuous tone images are detected, rescanning the entire document page at low speed and processing the resulting image signals by a continuous tone processing means and thereafter reverting to high speed scanning. Optionally, to enhance system operation, sub-sampling of the document being scanning when scanning at high speed may be performed.
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patent: 4149090 (1979-04-01), Agylnek
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patent: 4288821 (1981-09-01), Lavallee et al.
Coles Edward L.
Martin John C.
McMullen Frederick E.
Xerox Corporation
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