The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 08, 1984
Filed:
Sep. 10, 1981
James C Stoffel, Rochester, NY (US);
Xerox Corporation, Stamford, CT (US);
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.