Method for controlling concatenation of transformation matrices in a graphics display system
US4805117A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 26, 1986 |
| Grant date | Feb 14, 1989 |
| Priority date | — |
| Expiry date | Sep 26, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F7/4991
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
In graphics display systems the use of matrix concatenation for coordinate transformation, occasionally, will cause an overflow which may represent an out-of-bounds location of a data element. To correct the overflow problem, a number of translation shift factors are introduced for the last row of the matrix which when used to operate on matrix elements, will maintain the elements within the physical boundaries of the graphics base by preventing overflow. Additionally, a method of adjusting the clipping boundaries to increase the precision of coordinate transformations is also described. The methods of the invention may be implemented in microcode in a commercially availably graphics display system such as the IBM 5080 Graphics System.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.