Method and apparatus for generating an elliptical image
US5338200A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 15, 1992 |
| Grant date | Aug 16, 1994 |
| Priority date | — |
| Expiry date | Sep 15, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T15/005
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
Elliptical features are described in an image generator database in terms of an origin and major and minor axes defined by reference to a world or model space coordinate system. Image data is assembled for display by transforming the database contents into screen space and assessing for each of an array of sampling points distributed across screen space which features are to contribute to the portion of a final image in which the sampling point is located. In the case of elliptical features, data is transformed into eyepoint space and each sampling point is projected into eyepoint space to determine the point of intersection between a line drawn through the sampling point from the eyepoint and a plane defined by the axes. The coordinates of the intersection point in a coordinate system defined by the origin and axes, are used to determine whether or not the feature contributes to the sampling point.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.