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:
Dec. 25, 2012
Filed:
Mar. 09, 2004
Yasuyuki Kii, Yamatokooriyama, JP;
Yasuyuki Kii, Yamatokooriyama, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
Appropriate shadowing processing is performed even if coordinate conversion calculation values of polygons have errors. A calculation sectionperforms hidden surface removal processing on normal polygons based on visual-point coordinates and depth values from a visual-point coordinate conversion processing unit, and updates a pixel memoryand a Z-buffer memory. Further, based on a comparison result of obtained depth values of each polygon and Z values stored in the Z-buffer memory, shadowing is performed only on a coordinate region positioned in front of back-facing shadow polygons and behind front-facing shadow polygons when seen from a visual point, and the pixel memoryis updated. As a result, even if coordinate conversion calculation values in graphic data on polygons have errors, an edge portion of the shadow polygons which is not intended to be shadowed is not shadowed.