Method for temperature compensation of an image sensor sensitivity
US6828563B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 28, 2002 |
| Grant date | Dec 7, 2004 |
| Priority date | — |
| Expiry date | Jan 22, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N25/76
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method for temperature compensation of sensitivity of an image including photosensitive spots each with a photodiode connected to read circuits. The photosensitive spots are divided into detecting photosensitive spots, detecting an image when exposed to information carrying the image and sensitive to this information, and into blind spots protected from the information. When the photosensitive spots are taken to a reference temperature, an average leakage current in the photodiodes of the blind photosensitive spots is calculated and a first average is generated from signals from the blind photosensitive spots during a read operation. When the photosensitive spots are taken to an ambient temperature to be determined, another average is generated from signals from the blind photosensitive spots during another read operation. The ambient temperature is calculated from the average leakage current and from the distance between the two averages. A gain image or a quasi gain image matched to the ambient temperature is generated. An image recorded at the ambient temperature with the gain image or the quasi gain image is then corrected. Such a method may find application to radiological i…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.