Method for display rendering by determining the coverage of pixels in polygons
US5347618A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 3, 1993 |
| Grant date | Sep 13, 1994 |
| Priority date | — |
| Expiry date | Jun 3, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T15/80
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method for determining the coverage of a pixel, which includes determining a function of the distance from the currently sampled point to each edge of a polygon and then adding a predetermined value to the value of the function. This value is then clamped according to a function which provides an output of a predetermined value if the input to the function is not within a predetermined range and otherwise provides the value of the input if the input is within the predetermined range. The coverage of the pixel by the polygon is computed by multiplying the clamped functions. Blending the parameter values is performed if the value of the coverage falls within a predetermined range; otherwise, no blending occurs.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.