Self-calibration method and circuit architecture of image sensor
US6304826A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 5, 1999 |
| Grant date | Oct 16, 2001 |
| Priority date | — |
| Expiry date | Feb 5, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/401
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A self-calibration system for image sensors is disclosed. The system compensates signals from the image sensors for any distortions caused by inherent deficiencies in the image sensors. Image sensing modules employing the present invention will produce self-calibrated image signals without requiring the commonly used follow-up signal processing schemes. To achieve the self-calibration, an analyzing circuit is used to determine gains and offset values for each of the photodetectors in the image sensor based on a set of test signals. The gains and offset values are then stored in a persistent memory for access by an amplifier to adjust scanning signals representing a scanning object.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.