Method for constructing a model of the face of a person, method and device for posture analysis using such a model

A method for constructing a model of a face of an individual, the method comprising:

• a localization step of localizing, by an acquisition device and at each time of a plurality of acquisition times, one and the same plurality of points characteristic of said face of the individual to form a corresponding plurality of particular models of said face of the individual, each of the particular models of the face comprising the positions of said points characteristic of the face of the individual at the time associated with the respective particular model;
• an adjustment step of determining, for each particular model of said face of the individual, a model adjusted with respect to a reference model of said face of the individual, the adjusted model being obtained on the basis of the respective particular model such that the distance between the adjusted model and the reference model is minimal in the sense of a given metric;
• and
• a construction step of constructing, by one or more processing devices, from the adjusted models, said model of the face of the individual, the model of the face of the individual comprising a plurality of positions each obtained as the barycenter of positions of a given characteristic point in a plurality of the adjusted models.