Photosensor array using multiple exposures to reduce thermal noise
US7102679B1 · kind B1 · utility
2Cited by
12References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 25, 2000 |
| Grant date | Sep 5, 2006 |
| Priority date | — |
| Expiry date | Jan 21, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N25/713
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In an image scanner, multiple exposures are used for each scan line, and only part of the pixels for each scan line are used for each exposure. For example, with two exposures, half the pixels may be used for the first exposure, and half for the second exposure. For each exposure, half of the charges are shifted out rapidly and discarded, without waiting for the A/D conversion time. As a result, for each exposure, the time required to empty the charge shift register is greatly reduced, reducing the thermal noise for all pixels.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.