Method and apparatus for deriving instantaneous reciprocals of the homogenous coordinate w for use in defining images on a display
US5179659A · kind A · utility
13Cited by
4References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 8, 1987 |
| Grant date | Jan 12, 1993 |
| Priority date | — |
| Expiry date | May 8, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2207/5354
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An adaptive forward differencing apparatus, wherein, when rendering curves, calculated x, y values are increased or decreased in order to create values which correspond to the next pixel of the display CRT, such that curves of substantially one pixel increments are continuously and uniformly generated. The apparatus also provides circuitry for generating coordinates of display elements which approximate an ideal vector and to define curves, vectors or objects within maximum and minimum coordinates of the CRT display. The apparatus also provides efficient circuitry for computing the value of 1/w of the homogenous coordinate w.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.