METHOD AND SYSTEM FOR VISUALLY CRYPTING MOBILE OBJECTS WITHIN A COMPRESSED VIDEO STREAM

摘要

A method of protecting at least a portion of a video stream or a compressed video sequence against a violation of the information contained in said stream, said stream being decomposable into at least a first type of objects and a second type of objects, the method applying to a selection of images contained in said video sequence characterized in that it comprises at least the following steps: analyzing the video sequence in the compressed domain in order to define for a given image N at less a first type of objects to be protected by encryption and a second type of objects, (1, 2) determine, according to the division into portions or groups of portions of the existing image N (3b, 3a), those corresponding respectively to the first type of object to be protected (3b) and to the other types (3a), to encrypt at least a part of the first type of object (5a), to reconstitute from the outputs of the preceding steps a stream composed of at least one the first type of encrypted objects and other types of objects, to which is added information indicating which objects have been encrypted. System enabling the implementation of the method