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. 13, 2001
Filed:
Jun. 29, 1998
Shoji Sakamoto, Nakai-machi, JP;
Fuji Xerox Co., Ltd., Tokyo, JP;
Abstract
A high-speed image forming apparatus may alleviate a load imposed upon the drawing processing of the gradation. A drawing unit writes data in a page buffer while executing the drawing processing by using the drawing data stored in a drawing data storage unit. At that time, when generation of the gradation is instructed, the drawing unit accesses a gradation generation unit. The gradation generation unit sets a plurality of adjacent band-like regions which are perpendicular to a straight line connecting a start point with an end point and in which color values therein become uniform by using the vector of the changing direction of the transferred color and the color information at the start and endpoints, obtains the intersection point between the boundary of the band-like region and the scanning line, and sets such intersection point as the color changing point. At every scanning line, the color changing point and the color between the color changing points are successively obtained, and the gradation pattern in the scanning direction is generated successively.