System for characterizing objects of interest present in a scene, said system comprising: - a first stereoscopic image-capturing system for capturing a temporal sequence of pairs of images (P1, P2, P3, P4) of an object of interest present in said scene, - means for determining at least one region of interest (Z1, Z4) in at least one of the pairs of images captured by said first stereoscopic image-capturing system, - means for processing the or each region of interest thus determined in order to characterize the object of interest corresponding thereto, and further comprising: - means for obtaining a temporal sequence of pairs of images (PS1, PS2, PS3, PS4) in a resolution, referred to as low resolution, lower than the resolution, referred to as high resolution, of the pairs of images (P1, P2, P3, P4) captured by said first stereoscopic image-capturing system, - means for detecting, via stereoscopic computation, an object of interest (O1, O2, O3, O4) in each of the low-resolution pairs of images (PS1, PS2, PS3, PS4) and for determining coordinates of said objects of interest thus detected, said detecting means being configured to determine that the objects of interest (O1, O2, O3, O4) thus detected are representative of the same object by verifying the consistency in dimensions and in path between said objects of interest thus detected and to remove inconsistent objects of interest thus detected, said determining means determining said at least one region of interest only inside a sub-portion of the high-resolution pairs of images captured by said first stereoscopic image-capturing system, said sub-portion corresponding to the coordinates of consistent objects of interest detected by said detecting means. - a first stereoscopic image-capturing system for capturing a temporal sequence of pairs of images (P1, P2, P3, P4) of an object of interest present in said scene, - means for determining at least one region of interest (Z1, Z4) in at least one of the pairs of images captured by said first stereoscopic image-capturing system, - means for processing the or each region of interest thus determined in order to characterize the object of interest corresponding thereto, and further comprising: - means for obtaining a temporal sequence of pairs of images (PS1, PS2, PS3, PS4) in a resolution, referred to as low resolution, lower than the resolution, referred to as high resolution, of the pairs of images (P1, P2, P3, P4) captured by said first stereoscopic image-capturing system, - means for detecting, via stereoscopic computation, an object of interest (O1, O2, O3, O4) in each of the low-resolution pairs of images (PS1, PS2, PS3, PS4) and for determining coordinates of said objects of interest thus detected, said detecting means being configured to determine that the objects of interest (O1, O2, O3, O4) thus detected are representative of the same object by verifying the consistency in dimensions and in path between said objects of interest thus detected and to remove inconsistent objects of interest thus detected, - means for obtaining a temporal sequence of pairs of images (PS1, PS2, PS3, PS4) in a resolution, referred to as low resolution, lower than the resolution, referred to as high resolution, of the pairs of images (P1, P2, P3, P4) captured by said first stereoscopic image-capturing system, - means for detecting, via stereoscopic computation, an object of interest (O1, O2, O3, O4) in each of the low-resolution pairs of images (PS1, PS2, PS3, PS4) and for determining coordinates of said objects of interest thus detected, said detecting means being configured to determine that the objects of interest (O1, O2, O3, O4) thus detected are representative of the same object by verifying the consistency in dimensions and in path between said objects of interest thus detected and to remove inconsistent objects of interest thus detected, said determining means determining said at least one region of interest only inside a sub-portion of the high-resolution pairs of images captured by said first stereoscopic image-capturing system, said sub-portion corresponding to the coordinates of consistent objects of interest detected by said detecting means.