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Figure 2 Regularity of edge coefficients distribution in natural images. We plotted for 200 natural images the mean and variance (depicted by the dotted lines representing the mean $\pm$ one standard deviation) of the decrease of coefficients values in the probabilistic Matching Pursuit scheme described above as a function of the rank. Assuming that these values represent the edge content of the images, it shows that the probability distribution of edge coefficients is regular in natural images and may be used in an efficient compression scheme. It permits to evaluate the coefficients quickly as a function of the rank, and since the transmission error being proportional to the variance to transform efficiently an analog image in a wave of spikes. It should be noted that this decrease is much more rapid than the one observed in the model retina the coefficients are below .15 after 1\% of relative rank.

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