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:
Jun. 29, 2010
Filed:
Aug. 11, 2005
Cuong Hung Robert Cao, Panania, AU;
Cuong Hung Robert Cao, Panania, AU;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A method is described for determining a discrete boundary for an object to be rendered into a raster pixel image having a plurality of scanlines. In the method, the object is rotated by an integer multiple of 90 degrees, and an outline of the rotated object is decomposed into line segments. For each scanline to be rendered, points of intersection between the line segments and the scanline are determined, and each point of intersection is rounded to an adjacent position selected from a finite set of positions on the scanline using a rule chosen according to the amount of rotation. The rounded points of intersection delimiting the discrete boundary. If the object is rotated by odd multiple of 90 degrees the method includes the steps of identifying points of intersection that satisfy a predetermined criterion; and shifting the identified points of intersection prior to rounding.