1. A method, comprising: detecting movement of an entity provided with an image sequence sensor, by: generating k candidate vectors by adding, to a reference motion vector, respectively k search vectors; selecting a motion vector from among the said k candidate vectors as a function of a selection rule; repeating the previous two steps m times, the said reference motion vector being for a first iteration of the generating k candidate vectors, an initial reference vector selected from among a set of vectors comprising at least one motion vector associated with a previous processed image and being for the repetitions of the generating k candidate vectors, the motion vector selected in the previous iteration; associating the vector obtained in a last iteration with a current image of an image sequence being processed, m being an integer greater than or equal to 1 and k being an integer greater than 1, wherein an amplitude of the search vectors corresponding to the first generating of k candidate vectors is determined by selecting a largest value from among a threshold value, a horizontal component divided by two and a vertical component divided by two of a motion vector associated with a previous processed image, the generating, the selecting and the associating being performed by a configured controller.