The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 07, 2014
Filed:
Jul. 28, 2008
Gilles Chamming's, Grenoble, FR;
Gilles Chamming's, Grenoble, FR;
Commissariat a l'Energie Atomique, Paris, FR;
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 X(L) is established pixel by pixel that corresponds to the illumination of a pixel Pby a luminance L; a fixed reference Kis defined for this signal, the value Kbeing chosen such that, for a given luminance L, the pixels all supply an identical signal X(L) that is equal to K; and a corrected signal X*(L) is established by applying to the duly referenced signal X(L)−Ka multiplying correcting coefficient specific to the pixel concerned, the correcting coefficient being determined from the signal X(Lr) supplied by the pixel Pfor a determined reference luminance Lr which is the same for all the pixels. The correcting coefficient is preferably stored in an initialization register REGspecific to the pixel, which contains a value dTfor modulating the integration time of a counting frequency representing the luminance.