Patent ID: 8780246

Claim:
A method for correcting an image obtained by a photosensitive device comprising photosensitive points organized as a matrix of Nl rows by Nc columns, each photosensitive point configured to accumulate charges during exposure to luminous radiation, the method comprising: reading, row-by-row, at instants t=2n and t=2n+1 of signals representative of the charges accumulated at each n photosensitive point, where n being an integer lying between 0 and N−1, where N is an integer lying between 2 and the number Nl of rows of the matrix, the signals of one and the same row being read simultaneously, a determined duration T sampling separating two successive reading instants, the signals read at the instants t=2n being called useful signals representing the charges accumulated at the various photosensitive points subsequent to exposure of these points to useful luminous radiation, the signals that are read at the instants t=2n+1 being called offset signals representing the charges accumulated at the various photosensitive points in the absence of exposure to radiation, the useful signals forming discrete signal X real (n) for each column of the matrix and the offset signals forming discrete signal OF(n) for each column of the matrix; determining, for each discrete signal OF(n) corresponding to a column of the matrix, a signal OFX(n) representing the charges accumulated at the photosensitive points readable at the instants t=2n in the absence of exposure to radiation, the signals OFX(n) being determined by correcting the discrete signals OF(n); and subtracting, for each column of the matrix, the signal OFX(n) from the corresponding signal X real (n).