Method and device for capturing images of a moving subject

A device for capturing images of a region of interest of a moving subject within a capture volume, the device comprising:

• a context camera system;
• a capture camera;
• a processor configured for the following steps:
• computation, repeated at a computation frequency, of a three-dimensional position of the region of interest, delivering as output a sequence of three-dimensional positions of the region of interest, on which an instantaneous observable position signal depends, from a series of images acquired by the context camera system and in which the region of interest is detected and located;
• extraction, at an application frequency, of a periodic observable signal from the instantaneous observable position signal ;
• estimation of a three-dimensional path (Peyes(t)) of the region of interest in the capture volume from the computed positions, the path being defined, in at least one dimension, by a parametric path model combining a periodic temporal component (Pperiodic(t)) and a linear temporal component (Plinear(t));
• determination of a position of the region of interest at least at one future time tcapture from the estimated three-dimensional path of the region of interest;
• capture, at the time tcapture, of an image of the region of interest with the capture camera pointing in the direction of the determined position of the region of interest at the time tcapture.