Abstract: A method and device for compressing at least a portion of a video image for transmission in a video stream such that the compressed portion either includes or does not include an encoded residual depending on whether including the residual would be advantageous in terms of data rate and distortion. The size of the video stream and the resources needed for decompression at a receiver are optimized through encoding only the most relevant data in the video stream that is to be transmitted. If the information provided by a residual is insufficiently relevant, the residual is either not encoded or is not included in the transmitted video stream. Factors associated with a residual are only encoded and transmitted if use of the residual would limit the distortion in a satisfactory manner and if the encoding of the associated factors does not generate too high of a data rate.

Abstract: The present invention relates to the field of video compression and, specifically, to controlling the bit rate of the generated compressed sequence. This invention relates to a method for constant bit rate compression, using a step of normalizing the compression ratio. Variations in said ratio can thus be smoothed out, eliminating sudden variations in image quality in the resulting sequences. The perceived quality of the service is thereby improved.

Abstract: The present invention concerns a method of enciphering the digital content intended to be deciphered and retrieved on mobile terminals which makes it possible to limit the computing power necessary for the deciphering and therefore the energy used to do this. The broadcast content is partially enciphered. A signature of the headers of the pictures ensures the integrity of the data.

Abstract: The present invention concerns the field of stereoscopic photography devices and more precisely calibration thereof. The invention proposes a method for calibrating a stereoscopic photography device that calculates a set of correction parameters for the images. These parameters are classed according to an order of importance. The first-order correction parameters are estimated first, the second-order correction parameters secondly. Advantageously, the first-order parameters are refined by taking account of the estimation values of the second-order parameters. Advantageously, a measurement of the relevance of the scene is carried out before the actual calibration.

Abstract: A method and device for compressing at least a portion of a video image for transmission in a video stream such that the compressed portion either includes or does not include an encoded residual depending on whether including the residual would be advantageous in terms of data rate and distortion. The size of the video stream and the resources needed for decompression at a receiver are optimized through encoding only the most relevant data in the video stream. If the information added by a residual is insufficiently relevant or useful, the residual is not included or encoded. Factors associated with a residual are only encoded if use of the residual limits the distortion in a satisfactory manner and if the encoding of the associated factors does not generate too high of a data rate. Use of the method makes it possible to optimize resources needed by a decoder by optimizing use and encoding of the residual and associated factors.

Abstract: Audio encoding method and device comprising the transmission, in addition to the data representing a frequency-limited signal, of information relating to a temporal filter that can be applied to the entire broadened signal, both in its transmitted low-frequency part and in its reconstituted high-frequency part. The application of this filter allowing the reshaping the reconstituted high-frequency part and the correction of compression artifacts present in the transmitted low-frequency part. In this way, the application of the temporal filter, simple and inexpensive, to all or part of the reconstituted signal, makes it possible to obtain a signal of good perceived quality.

Abstract: A method and device for compressing at least a portion of a video image such that a compressed video stream includes, or does not include, an encoding of a residual depending on whether it is advantageous to do so in terms of costs in rate and in distortion. The size of the video stream and resources needed for decompression are optimized through encoding only the most relevant data in the video stream. If the information added by the residual is insufficiently relevant or useful, the residual is not encoded. Factors associated with the residual are only encoded if use of the residual limits the distortion in a satisfactory manner and if the encoding of the associated factors does not generate too high a rate. Use of the method makes it possible to optimize resources needed for a decoder by optimizing the encoding of the residual.

Abstract: Audio encoding method and device comprising the transmission, in addition to the data representing a frequency-limited signal, of information relating to a temporal filter that is to be applied to the entire enhanced signal, both in its transmitted low-frequency part and in its reconstituted high-frequency part. The application of this filter for reshaping the reconstituted high-frequency part and the correction of compression artefacts present in the transmitted low-frequency part. In this way, the application of the temporal filter, simple and inexpensive, to all or part of the reconstituted signal, makes it possible to obtain a signal of good perceived quality.