Method and system for producing formatted data related to geometric distortions

A system for producing formatted information related to appliances of an appliances chain, the appliance chain including at least one image-capture appliance and/or at least one image-restitution appliance, in which the appliance contains at least one variable characteristic depending on the image, each variable characteristic configured to be associated with one or more values of characteristic, the system comprising:

• means for capturing or restituting a reference scene by the appliance, to produce, on a medium, characteristic image points that are images of reference points of the reference scene;
• means for establishing a bijection between the characteristic image points and the reference points, so as to obtain a measured field composed of set of pairs composed of one of the reference points, and of the characteristic image point associated by the bijection;
• means for selecting one or more variable characteristics among the set of variable characteristics and including, in the measured field, the value for each image of each of the selected variable characteristic;
• means for selecting on the medium, only four characteristic image points such that a quadrilateral defined by the four characteristic image points has a maximum area and a center of gravity situated in proximity of the geometric center of the image;
• means for choosing a mathematical projection between the medium and a reference surface, the mathematical projection being a bilinear transformation that transforms the four characteristic image points into four specific reference points among said reference points associated by the bijection with the four characteristic image points,
• wherein the measured field includes the value for the image of each of the four specific reference points and the mathematical projection onto the reference surface of the four characteristic image points, and/or of the pair composed of the four characteristic image points and the mathematical projection of the four specific reference points onto the medium;
• and
• means for producing, from the measured field, said formatted information related to geometric distortions of the appliance.