Computer graphics system for rendering images using full spectral illumination data
US5710876A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 25, 1995 |
| Grant date | Jan 20, 1998 |
| Priority date | — |
| Expiry date | May 25, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T15/506
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A computer controlled graphics system for processing an image using full spectral representations. An object in an image has an associated full spectral surface reflectance function. Each illumination source is represented by a light vector whose components represent the weights of predetermined basis functions, so that said illumination vector represents a light source in full spectral representation. A plurality of sensors each has an associated sensor response function. A user may select, either directly or indirectly such as through a graphics program, the surface reflectance function, each light source, and the sensor response functions. At a point on an object, the color processing system determines a surface matrix responsive to the surface reflectance function at said point, the plurality of predetermined basis functions, and the plurality of sensor response functions. Responsive to the surface matrix and each illumination vector the color processing system uses a matrix multiplication circuit to determine a set of colorimetric sensor values for the point. A user may also select a texture and/or an environment map. The texture map may comprise a surface matrix at each texel…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.