Csem Centre Suisse D'electronique Et De Microtechnique Sa&#x2014;recherche Et D&#xe9;veloppement

Eric Fragniere

Pascal Heim

Eric Grenet

François Kaess

Pierre-François Ruedi

Pierre François Ruedi

The invention relates to a method of calculating the local contrast at each pixel (P) in a network (M) of photosensitive pixels which are arranged in at least one dimension (x, y). The inventive method consists in, during successive image acquisition cycles, producing a signal which is representative of the local luminance at each pixel, said luminance-representative signals being integrated values of luminance values sensed by the respective pixels (p, p, p, p, p). The inventive method consists in: sampling the integrated values of the signals representing the luminance values at the pixels adjacent (p, p, p, p) to a considered pixel (p), said sampling taking place at an instant in the cycle when the integrated value of the luminance at the considered pixel (p) is equal to a pre-determined reference value; and determining the local contrast at the considered pixel (p) on the basis of values thus sampled.

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Neuchatel, Switzerland

Eric Fragniere