Method of correcting sensitivity and matrix image sensor for implementing this method
US8624178B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 28, 2008 |
| Grant date | Jan 7, 2014 |
| Priority date | — |
| Expiry date | Jun 22, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N25/76
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The invention relates to matrix image sensors, and more particularly to a method for correcting the spatial noise caused by the dispersion of the physical properties of the various pixels of the matrix. According to the invention, a signal Xi(L) is established pixel by pixel that corresponds to the illumination of a pixel Pi by a luminance L; a fixed reference K0 is defined for this signal, the value K0 being chosen such that, for a given luminance L0, the pixels all supply an identical signal Xi(L0) that is equal to K0; and a corrected signal X*i(L) is established by applying to the duly referenced signal Xi(L)−K0 a multiplying correcting coefficient specific to the pixel concerned, the correcting coefficient being determined from the signal Xi(Lr) supplied by the pixel Pi for a determined reference luminance Lr which is the same for all the pixels. The correcting coefficient is preferably stored in an initialization register REG1 specific to the pixel, which contains a value dTi for modulating the integration time of a counting frequency representing the luminance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.