摘要:
The invention relates to a device for coding video data comprising means to code a video stream as groups of pictures, each group of pictures comprising at least one description unit relevant to the coding of the said group of pictures. According to the invention, the coding device comprises means to insert in the stream of data at least one message indicating whether the description unit of the current group of pictures is identical to the description unit relevant to the preceding group of pictures. The invention also relates to a device for decoding video data comprising means to decode a stream of data coded with a device according to one of the preceding claims. According to the invention, the decoding device comprises means to analyse the said messages, means to decode the at least one next description unit if the said message indicates that this unit is different from the preceding description unit, otherwise, if it is identical, not to decode it.
摘要:
The invention relates to a method and a device for coding video data comprising means for coding the pictures in data groups. According to the invention, the device comprises means for inserting, into the coded data groups, a message comprising parameters originating from the coding of the said group and allowing, during a subsequent decoding, a reconstruction of the said data in the event of error during the coding or during the decoding.
摘要:
The invention relates to a device and a method for coding video data. The device comprising means for coding each picture in slices of pictures, each slice being coded independently of the other slices. According to the invention, the device comprises means for inserting into the data stream at least one message indicating the structure relating to the breakdown of the pictures into slices. The invention also relates to a system for decoding and a method for decoding video data, the said video data having been coded in slices, each of the slices being coded independently of the other slices. According to the invention, the coding system comprises means for analysing the video data in order to ascertain the breakdown of the data into slices, means for decoding the video data slice by slice, means for reconstructing the various video data after they have been decoded in order to reconstruct the decoded video data.
摘要:
The method is it comprises the following steps: determination of the prediction window type related to the motion vector, non-outgoing or outgoing according to whether the prediction window is positioned entirely or in part inside the reference image. if the prediction window is of outgoing type, filling a prediction buffer area having dimensions at least equal to that of the prediction window and positioned so as to include the prediction window, with the pixels of the reference image that are common to the prediction area and, for the remaining part, by copying, from said pixels, those located on the edge of the image, calculating the predictor from the pixels of the buffer area located in the prediction window. The applications relate to compression in H 264 or MPEG 4 part 10 format.
摘要:
The present invention relates in particular to a synchronization system and method. The synchronization system comprises a specification unit for specifying synchronization signals associated with an audiovisual programme, the latter comprising an audiovisual content and control information, a recognition unit for recognizing the synchronization signals in a transmitted stream carrying this programme, by recognition of at least one extracted portion of the audiovisual content, and an activation unit triggering an action in case of detection of these signals. The specification unit prepares and transmits to the recognition unit recognition elements making it possible to obtain this extracted portion, as well as at least one action timeout lag in case of detection of the synchronization signals. The recognition or activation unit then delays the triggering of this action according to the lag transmitted, in case of detection of the synchronization signals. In variants, the timeout lag is determined and/or the recognition elements are obtained independently of the specification unit.
摘要:
The present invention relates in particular to a synchronization system and process. The synchronization system comprises a specification unit for specifying synchronization signals associated with an audiovisual programme, the latter comprising an audiovisual content and control information, a recognition unit for recognizing these synchronization signals in a stream carrying this programme transmitted via a broadcasting network, by recognizing at least one extracted portion of the audiovisual content, and an activation unit triggering an action in case of detection of these signals. The specification unit prepares and transmits to the recognition unit recognition elements making it possible to obtain this extracted portion, which comprise instructions for extracting the portion of content from at least one stream of an audiovisual programme previously received by the recognition unit via the broadcasting network. In variants, the recognition elements are obtained independently of the specification unit. Applications to interactive television and to automatic recordings.
摘要:
The invention relates to a method for coding a sequence of images, comprising the following steps: determining, for the image data, the prediction image data from reference image data, calculating residual data from image data and prediction image data, quantizing the residual data with a quantization step, reconstructing the image data into reconstructed image data, filtering the reconstructed image data according to at least one filtering parameter with a view to their use as reference image data, coding the quantized residual data, selecting a function representing the variations of at least one filtering parameter according to a quantization step value of a set of at least two functions from a predetermined value representative of a filtering intensity, determining the value of at least one filtering parameter from the function selected and the quantization step.
摘要:
The invention relates to a method for coding a sequence of images, comprising the following steps: determining, for the image data, the prediction image data from reference image data, calculating residual data from image data and prediction image data, quantizing the residual data with a quantization step, reconstructing the image data into reconstructed image data, filtering the reconstructed image data according to at least one filtering parameter with a view to their use as reference image data, coding the quantized residual data, selecting a function representing the variations of at least one filtering parameter according to a quantization step value of a set of at least two functions from a predetermined value representative of a filtering intensity, determining the value of at least one filtering parameter from the function selected and the quantization step.
摘要:
The present invention relates to a conditional decision device and method for the execution of services received, having predetermined life spans. This device receives and identifies information relating to computer programs required for the execution of these services. It checks the local availability of these programs and allows the services to be executed if the associated programs are available locally. Furthermore, it is capable of triggering a downloading of the programs when the latter are not available locally, and allowing or preventing such a download, at least according to information associated with the services. The invention also relates to a device and a method for compiling associated messages. Application to ATVEF and MHP standards.
摘要:
The present invention concerns a device and a process for signing digital streams, each of them comprising contents, related to audiovisual information, and a signaling. The device applies encrypting to selectively determined descriptors of the signaling, called authenticated descriptors, to obtain signature. The invention also concerns corresponding authentication device and process. Application to authentication of DVB/MPEG digital streams, notably for MHP.