Vignetting compensation
US7692700B2 · kind B2 · utility
7Cited by
14References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 4, 2003 |
| Grant date | Apr 6, 2010 |
| Priority date | — |
| Expiry date | Aug 30, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N25/61
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method used for the compensation of vignetting in digital cameras has been achieved. The compensation for vignetting is done in two steps. The first step is done during production of the camera unit and involves taking and analyzing an image of a test screen, preferably a gray test screen. This results in a set of e.g. 5×5 coefficients describing a polynomial surface. The second step is done for each image that is taken by the camera and involves calculating and applying a gain-table based on polynomial coefficients to all pixels of the image to compensate vignetting.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.