System and method for increasing projector amplitude resolution and correcting luminance non-uniformity
US6921172B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 2, 2003 |
| Grant date | Jul 26, 2005 |
| Priority date | — |
| Expiry date | Jul 2, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/74
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A system and method corrects luminance non-uniformity and increases the apparent amplitude resolution of an image generated by a projector. The projector, which has a given number of stated levels, receives input data and projects images based on that input data. To correct luminance non-uniformity, a projector correction look-up table (LUT) is created. The LUT attenuates the displayed image such that the whole image has the same luminance as the dimmest point. Input data received by the projector is modified by correction information containing in the LUT. The projector output is analyzed to identified the number of unique levels that the projector is capable of producing, which may be less than the number of stated levels. A dithering engine modify the corrected image data to increase the projector's amplitude resolution, creating the illusion of the projector having more than the limited number of unique levels identified.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.