Anti-aliasing raster operations utilizing sub-pixel crossing information to control pixel shading
US4908780A · kind A · utility
111Cited by
6References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 14, 1988 |
| Grant date | Mar 13, 1990 |
| Priority date | — |
| Expiry date | Oct 14, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G5/393
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for performing anti-aliasing of rendered lines, text and images displayed by a workstation on a video display. The anti-aliasing is performed by logically dividing each addressable frame buffer pixel into sixteen sub-pixels and generating a gray scale value for the displayed pixel that is a function of the number of sub-pixels crossed by a portion of a rendered image. The invented circuitry is part of the circuitry used for combining source and destination data which forms the displayed image namely, an anti-aliasing mask and filter, adder/subtractor logic, saturation logic and anti-aliasing logic.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.