1. Process for producing a synthesized reference image with the aid of image processing means and cameras on the basis of a descriptive image of an object to be inspected contained in the processing means and defined in a first format relative to the processing means, comprising the following steps: a) determining, in the descriptive image, characteristic elements of the object; b) determining the coordinates of the characteristic elements in the descriptive image; c) acquiring with the aid of cameras, of at least one real image of the object defined in a second format relative to said cameras; d) sampling on a real image of the object for the purpose of obtaining samples of at least one characteristic element of the real image; e) changing the first format of the descriptive image of the object and the coordinates of the characteristic elements into an equivalent descriptive image and equivalent coordinates of the characteristic elements defined in the second format, so that the samples of at least one characteristic element of the real image correspond to at least one characteristic element in the characteristic elements of the equivalent descriptive image of the object; f) centering the samples as a function of the equivalent coordinates obtained during the format change operation e) to form centered samples; shifting the centered Samples in accordance with a plurality of predefined values so as to form preshifted centered samples; and h) applying the preshifted centered samples to the corresponding at least one of the characteristic elements of the equivalent descriptive image given in the second format.