Patent ID: 8588480

Claim:
Method for generating a density image of an observation zone through which individuals pass over a given time interval, thereby acquiring a plurality of images of the observation zone by means of a camera, the following steps being carried out for each acquired image: extracting a fixed background from the image, a step a) of detecting zones of pixels, “blobs”, standing out from the fixed background of the image, a step b) of detecting the individuals, in which: b1) for each blob, several hypotheses for possible positions are generated within a three-dimensional model of the observation zone by using the features of the camera and a standard size of the individual; and for each possible position, a head of an individual is detected by applying a three-dimensional model of an individual onto the corresponding blob, b2) counting the individuals for each blob, c) for each detected individual, determining elementary areas occupied by this individual, and d) a density image is generated in which the thus-determined elementary areas are incremented by a level of intensity.