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:
Sep. 08, 1987
Filed:
Jul. 25, 1985
Hiroyoshi Tsuchiya, Kawasaki, JP;
Toshiharu Kurosawa, Yokohama, JP;
Hirotaka Otsuka, Tama, JP;
Yuuji Maruyama, Inagi, JP;
Katsuo Nakazato, Shinjuku, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
The invention relates to a method for processing an image signal such that areas of original image data are sequentially scanned with a scanning window having a size corresponding to M picture elements in units of a predetermined number of picture elements so as to perform halftone display in accordance with black-and-white binary distribution with respect to the signal levels of the picture elements within the scanning window every time the scanning window is moved. The picture elements within the scanning window are assigned an order of preference in accordance with their image signal levels. A sum of the image signal levels of the picture elements within the scanning window is calculated, and A and N of the equations S=C.times.N+A are calculated, where C is a predetermined image signal level (e.g., black level and maximum level), N is an integer, and A is the image signal level falling within the range O.ltoreq.A<C. As a result of the preference operation, N picture elements are assigned a level C, the next picture element is assigned a level A, and the remaining picture elements, O. In order to impart regularity to the converted image signal distribution, additional data is added to the preference data.