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:
Feb. 15, 1994
Filed:
Aug. 13, 1992
Brian M Kelleher, Palo Alto, CA (US);
Digital Equipment Corporation, Maynard, MA (US);
Abstract
A system (30) draws antialiased polygons. A CPU (32) is connected to a floating point processor (FPU) (34) by bus (36). The CPU (32) is connected by a 32-bit system bus (38) to a random access memory (RAM) (40), a cache (42) and an interface (44) in graphics subsystem (45). The interface (44) is connected by bus (46) to graphics processor (48). The graphics processor (48) is connected by 120-bit graphics bus (50) to frame buffer (52). The frame buffer (52) is connected to a video digital to analog converter (DAC) (54) by bus (56). The DAC (54) is connected to video display (58) by line (60). The graphics processor (48) use a technique known as super-sampling to combat the effects of aliasing. In aliased mode, the graphics processor (48) use 16 array sites to sample 16 pixels (72). When drawing a polygon or line in antialiased mode, the graphics processor (48) uses the 16 sites to sample at 16 locations (120) within a single pixel (72). The antialiasing is done by determining what proportion of the locations (120) within each pixel (72) are within the polygon and setting a color of each pixel (72) on the basis of the proportion.