Imaging system with low sensitivity to variation in scene illumination
US6683645B1 · kind B1 · utility
60Cited by
12References
40Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 22, 1998 |
| Grant date | Jan 27, 2004 |
| Priority date | — |
| Expiry date | May 22, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10F39/802
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An imaging system comprises an image detection unit (52) and a filter unit (58). Pixel image signals are passed in parallel from the image detection unit (52) to the filter unit (58). Circuit elements within each pixel (56) generate pixel image signal whose amplitude is proportional to the logarithm of the image intensity at that pixel. The filter unit (58) carries out a spatial filtering operation and outputs the result.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.