Abstract: A device and a process for detecting the movement of a target observed in the field of view of an optical detector in which a differential image is determined from two successive pictures of the field of view, a binary image is formed from the differential image and from a binary conversion threshold, moving zones in the binary image are individualized, individual envelopes surrounding the zones are determined, an overall envelope surrounding the individual envelopes is determined, and it is determined whether there is movement of the target from the individual envelopes and the overall envelope.

Abstract: The present invention relates to a process and a device for determining the location of a target (C) observed in the field of view of an optical detector.According to the invention, the process is notable in that:in a preliminary step, there are determined, at least one partial image (9, 10) of the background and one partial image (11) of the target (C); andnext:a picture (V1) is taken;at least one background search window (19) is isolated from said picture (V1);the partial image (9) of the background is searched for in said search window (19);the movement of the optical detector is determined from the position of this partial image (9);a target search window (26) is isolated;the partial image (11) of the target is searched for in said search window (26); andthe movement of the target (C) is determined from the position of this partial image (11).