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:
Mar. 30, 1993
Filed:
Nov. 13, 1991
Yee S Ng, Fairport, NY (US);
Hwai T Tai, Rochester, NY (US);
Eastman Kodak Company, Rochester, NY (US);
Abstract
An image processing system renders halftone images with an increased number of gray level steps without increasing the number of sub-elements in the halftone cells. A document copying apparatus which generates a plurality of electrical image signals of successive picture elements of an original document compares input image signals representing low optical density picture elements of the original document to a series of threshold values selected from a two dimensional matrix halftone cell in which an output signal density pattern grows in a low spacial frequency manner; compares input image signals representing high optical density picture elements to a series of threshold values selected from a two dimensional matrix halftone cell in which an output signal density pattern grows in a high spacial frequency manner; and compares input image signals representing mid-optical density picture elements to a series of threshold values selected from the first or the second halftone cells according to the optical density of the picture element.