Abstract: A dynamically reconfigurable video surveillance system includes at least one video camera, a remote server, at least one viewing terminal, means making it possible to record the video sequences captured by the camera or cameras, said system being characterized in that: the video camera or cameras and the remote server include means for communicating with one another across a telecommunications network; the video camera or cameras include means for compressing the video sequences captured, the compression rate being adapted dynamically by taking account of the control messages originating from the remote server; the video camera or cameras include means for analyzing said video sequences in the compressed domain, to characterize the activity detected in their field of vision and to forward the result of this characterization to the remote server; the remote server include means for computing for each of the compressed video streams originating from the video camera or cameras a command making it possible to pa

Abstract: A method and interactive system for the on-line transmission of a high-resolution video sequence composed of a succession of T images includes a step of selecting relevant images comprising at least the following steps: split each image to be transmitted at the instant t into a number N of zones, for each zone n determined in the previous step, calculate a value representative of the content of said zone, for each image to be transmitted, generate a vector representative of the content of said image containing the values obtained in the previous step, calculate a normalized coefficient of correlation ? between the reference vector determined for a previously selected image and that calculated for the current image, make a decision on the selection (or not) of the current image as a function of the value of the normalized correlation coefficient ?.

Abstract: In a method of embedding a binary sequence in a video sequence or a compressed video stream, said stream being able to be decomposed into several types of objects, the method is applied to at least one image contained in said video sequence The method includes analyzing the video sequence in the compressed domain so as to determine one or more zones of interest, generating a watermarking map containing the image blocks available for the watermarking, excluding from the watermarking map, for the current compressed image, the blocks that are not eligible according to a defined criterion, and applying a digital watermarking function to each available block.

Abstract: A method is provided for visually encrypting at least one part of an at least partially compressed video stream or video sequence, it being possible for said stream to be decomposed into a first type of objects and a second type of objects, the method being applied on each of the images contained in a video sequence, including at least the following steps: analyzing the sequence in the compressed domain so as to define for a given image N at least one first group of objects to be protected by visual encryption and a second group of objects, the transformed coefficients and the motion estimation vectors being transmitted directly to step d) of compression, predicting on the basis of the data arising from the analysis in the previous step of the compressed image N, the position of the objects for a following image N+1, determining the splitting into slices or into groups of slices of the image N+1, compressing the first group of objects of the image N+1 and ciphering at least one part thereof, transmitting t

Abstract: A dynamically reconfigurable video surveillance system includes at least one video camera, a remote server, at least one viewing terminal, means making it possible to record the video sequences captured by the camera or cameras, said system being characterized in that: the video camera or cameras and the remote server include means for communicating with one another across a telecommunications network; the video camera or cameras include means for compressing the video sequences captured, the compression rate being adapted dynamically by taking account of the control messages originating from the remote server; the video camera or cameras include means for analyzing said video sequences in the compressed domain, to characterize the activity detected in their field of vision and to forward the result of this characterization to the remote server; the remote server include means for computing for each of the compressed video streams originating from the video camera or cameras a command making it possible to pa

Abstract: A method and interactive system for the on-line transmission of a high-resolution video sequence composed of a succession of T images includes a step of selecting relevant images comprising at least the following steps: split each image to be transmitted at the instant t into a number N of zones, for each zone n determined in the previous step, calculate a value representative of the content of said zone, for each image to be transmitted, generate a vector representative of the content of said image containing the values obtained in the previous step, calculate a normalized coefficient of correlation ? between the reference vector determined for a previously selected image and that calculated for the current image, make a decision on the selection (or not) of the current image as a function of the value of the normalized correlation coefficient ?.

Abstract: In a method of embedding a binary sequence in a video sequence or a compressed video stream, said stream being able to be decomposed into several types of objects, the method is applied to at least one image contained in said video sequence The method includes analyzing the video sequence in the compressed domain so as to determine one or more zones of interest, generating a watermarking map containing the image blocks available for the watermarking, excluding from the watermarking map, for the current compressed image, the blocks that are not eligible according to a defined criterion, and applying a digital watermarking function to each available block.

Abstract: A method is provided for protecting a compressed video stream that may be decomposed into a foreground plane composed of objects of a first type and a background plane composed of objects of a second type against errors during the transmission of this stream on an unreliable link, characterized in that it comprises at least the following steps: a) analyzing the stream in the compressed domain so as to define various image areas in which redundancy will be added, the motion estimation vectors and the transformed coefficients obtained in the compressed domain are transmitted to the redundancy addition step; b) adding redundancy to the objects of said areas determined in the previous step, a), while taking account of the motion estimation vectors and of the transformed coefficients obtained in the compressed domain; c) transmitting the set of areas forming the image.

Abstract: A method is provided for visually encrypting at least one part of an at least partially compressed video stream or video sequence, it being possible for said stream to be decomposed into a first type of objects and a second type of objects, the method being applied on each of the images contained in a video sequence, including at least the following steps: analyzing the sequence in the compressed domain so as to define for a given image N at least one first group of objects to be protected by visual encryption and a second group of objects, the transformed coefficients and the motion estimation vectors being transmitted directly to step d) of compression, predicting on the basis of the data arising from the analysis in the previous step of the compressed image N, the position of the objects for a following image N+1, determining the splitting into slices or into groups of slices of the image N+1, compressing the first group of objects of the image N+1 and ciphering at least one part thereof, transmitting t

Abstract: A method and system is provided of protecting at least one part of a video stream or of a compressed video sequence against a violation of the information contained in said stream, said stream being able to be broken down into at least one first type of objects and one second type of objects, the method being applied 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 so as to define for a given image N at least one first type of objects to be protected by encryption and one second type of objects, the analysis module which identifies the portions of the image belonging to the first type of objects to be protected sends the motion estimation vectors and the transformed coefficients to the encryption step; determining, according to the breakdown into portions or into groups of portions of the existing image N, those corresponding respectively to the first type of objects to be protected