1. A process for plotting, from a theoretical curve, a corresponding curve with smoothing on a visualization surface of a visualization module, said visualization surface being divided into pixels in a first mesh network with given pitch, by causing, through scanning, the illumination of a number of pixels whose position is determined so as to obtain the form of the theoretical curve to be plotted, this process comprising the following steps: previous storage of a predetermined number of patterns formed from at least two adjacent pixels disposed in the same line or in the same column, and each representing an elementary curve portion, these patterns being addressable as a function of the position in the pattern of said theoretical curve, determination, by an incremental procedure, of the set of points best following said theoretical curve in a second mesh network, determination of the closest pixels of said visualization surface to said determined points, measurement of the distance e from each of said closest pixels to said theoretical curve, determination, as a function of this distance e, of the pattern whose elementary curve portion corresponds to that of said theoretical curve to be plotted, and illumination of said pattern on said visualization surface.