METHOD OF CORRECTING SENSITIVITY AND MATRIX IMAGE SENSOR FOR IMPLEMENTING THIS METHOD

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.