Method for analyzing the behavior of individuals moving in an observation zone comprising an object of interest, in which method a plurality of images of the observation zone is acquired by means of a camera, the method comprising, for each image acquired, the following steps: - extracting a fixed background from the image, - a step a) of detecting zones of "blob" pixels standing out from the fixed background of the image, - a step b) of detecting individuals, in which: b1) for each blob, a plurality of hypotheses of possible positions are generated within a three-dimensional model of the observation zone using the characteristics of the camera and a standard size of individual; and for each possible position, a visible point of an individual is detected by applying a three-dimensional model of an individual to the corresponding blob, b2) individuals for each blob are counted, c) for each individual detected, determining the elementary surfaces occupied by this individual, characterized in that said step b) of detecting individuals further includes processing said visible point of an individual in order to establish coherence between head and foot positions consisting of: - establishing a correspondence between pixels of the image and points in the corresponding space, - considering that the pixels of a blob corresponding to a visible point of an individual possibly correspond to the feet or the head, and - projecting these pixels onto the ground planes and planes placed at standard head height, the common projection zone of the feet and the head being identified as a possible position, the method further comprising a step d) of determining, for a given time interval, the trajectory of each individual having crossed the observation zone for all the determined positions by minimizing the overall distance between the positions determined in this way in the current image and positions determined in a previous image. - extracting a fixed background from the image, - a step a) of detecting zones of "blob" pixels standing out from the fixed background of the image, - a step b) of detecting individuals, in which: b1) for each blob, a plurality of hypotheses of possible positions are generated within a three-dimensional model of the observation zone using the characteristics of the camera and a standard size of individual; and for each possible position, a visible point of an individual is detected by applying a three-dimensional model of an individual to the corresponding blob, b2) individuals for each blob are counted, b1) for each blob, a plurality of hypotheses of possible positions are generated within a three-dimensional model of the observation zone using the characteristics of the camera and a standard size of individual; and for each possible position, a visible point of an individual is detected by applying a three-dimensional model of an individual to the corresponding blob, b2) individuals for each blob are counted, - establishing a correspondence between pixels of the image and points in the corresponding space, - considering that the pixels of a blob corresponding to a visible point of an individual possibly correspond to the feet or the head, and - projecting these pixels onto the ground planes and planes placed at standard head height, the common projection zone of the feet and the head being identified as a possible position,