Abstract: The present invention relates to a method of and a device for decoding a set of encoded frames at a first resolution (SD) so as to produce a set of output frames at a lower resolution (QCIF).

Abstract: The present invention relates to a method of and a device for decoding a set of encoded frames at a first resolution (SD) so as to produce a set of output frames at a lower resolution (QCIF).

Abstract: The invention relates to a method of modifying data in an encoded data signal 125 corresponding to successive pictures divided into sub-pictures, for providing an output modified data signal 126. In particular, this invention can be used for the insertion of an additional data signal 127 into a compressed video signal 125. The proposed schemes according to the invention are based on a transcoder arrangement including at least partial decoding means and partial re-encoding means. This method leads to a cost-effective solution compared to the prior art comprising a minimum number of functional sub-steps, in particular including a unique motion compensation sub-step 205, taking advantage of simplifications and combinations between different sub-steps.

Abstract: The invention relates to a method of modifying data in an encoded data signal 128 corresponding to successive pictures divided into sub-pictures, for providing an output modified data signal 129. In particular, this invention can be used for the insertion of an additional data signal 130 into a compressed video data signal 128. The proposed arrangements/diagrams according to the invention are based on a transcoder arrangement including at least partial decoding means and partial re-encoding means. This method leads to a cost-effective solution compared with the prior art comprising a minimum number of functional DCT/IDCT sub-steps, taking advantage of simplifications and combinations between different sub-steps.

Abstract: The invention relates to a method of modifying data in an encoded data signal 125 corresponding to successive pictures divided into sub-pictures, for providing an output modified data signal 126. In particular, this invention can be used for the insertion of an additional data signal 127 into a compressed video signal 125. The proposed schemes according to the invention are based on a transcoder arrangement including at least partial decoding means and partial re-encoding means. This method leads to a cost-effective solution compared to the prior art comprising a minimum number of functional sub-steps, in particular including a unique motion compensation sub-step 205, taking advantage of simplifications and combinations between different sub-steps.

Abstract: The invention relates to a method of modifying data in an encoded data signal 125 corresponding to successive pictures divided into sub-pictures, for providing an output modified data signal 126. In particular, this invention can be used for the insertion of an additional data signal 127 into a compressed video signal 125. The proposed schemes according to the invention are based on a transcoder arrangement including at least partial decoding means and partial re-encoding means. This method leads to a cost-effective solution compared to the prior art comprising a minimum number of functional sub-steps, in particular including a unique motion compensation sub-step 205, taking advantage of simplifications and combinations between different sub-steps.

Abstract: A method of modifying data in an encoded data signal 128 corresponding to successive pictures divided into sub-pictures, for providing an output modified data signal 129. In particular, this model can be used for the insertion of an additional data signal 130 into a compressed video data signal 128. The proposed arrangements/diagrams according to the method are based on a transcoder arrangement including at least partial decoding and partial re-encoding. This method leads to a cost-effective solution compared with the prior art comprising a minimum number of functional DCT/IDCT sub-steps, taking advantage of simplifications and combinations between different sub-steps.

Abstract: A switching device SW allows to switch from a first compressed data input stream IS1 to a second compressed data input stream IS2, resulting in a compressed data output stream OS. This switching device comprises a buffer system BS intended to store the data contained in the first and second input streams, and control means CONT which controls the storage of the input streams in the buffer system in order to switch, at a switch request SWR, from the first input stream to the second input stream, using a commutation device COM. A transcoding system TS is intended to receive the data stream at the output of the commutation device and to provide the output stream in a seamless way. The use of a transcoding system allows to avoid an underflow or an overflow of the buffer of the decoder that will have to decode the output stream.

Abstract: The invention relates to a method and device for sending a user data from a video encoder to a video decoder, the user data being inserted in the coded video signal generated by said video encoder.

Abstract: The invention relates to a method of generating a down-sampled video from a coded video, said down-sampled video being composed of output down-sampled frames having a smaller format than input frames composing said coded video, said input coded video being coded according to a block-based technique and comprising quantized DCT coefficients defining DCT blocks, said method comprising an error decoding step for delivering a decoded data signal from said coded video, said error decoding step comprising at least a variable length decoding sub-step applied to said quantized DCT coefficients in each DCT block for delivering variable length decoded DCT coefficients defining, a prediction step for delivering a motion-compensated signal of a previous output frame, an addition step for adding said decoded data signal to said motion-compensated signal and resulting in said output down-sampled frames.

Abstract: The invention relates to a method of modifying data in an encoded data signal 128 corresponding to successive pictures divided into sub-pictures, for providing an output modified data signal 129. In particular, this invention can be used for the insertion of an additional data signal 130 into a compressed video data signal 128. The proposed arrangements/diagrams according to the invention are based on a transcoder arrangement including at least partial decoding means and partial re-encoding means. This method leads to a cost-effective solution compared with the prior art comprising a minimum number of functional DCT/IDCT sub-steps, taking advantage of simplifications and combinations between different sub-steps.

Abstract: The invention relates to a method of modifying data in an encoded data signal 125 corresponding to successive pictures divided into sub-pictures, for providing an output modified data signal 126. In particular, this invention can be used for the insertion of an additional data signal 127 into a compressed video signal 125. The proposed schemes according to the invention are based on a transcoder arrangement including at least partial decoding means and partial re-encoding means. This method leads to a cost-effective solution compared to the prior art comprising a minimum number of functional sub-steps, in particular including a unique motion compensation sub-step 205, taking advantage of simplifications and combinations between different sub-steps.

Abstract: A method is disclosed for communication between a plurality of stations. The method includes selecting a master station, which becomes responsible for building and broadcasting at least one service information table (such as the tables defined in MPEG or DVB), and communicates with the (N−1) to the other stations, known as slave stations, in a limited number of situations corresponding to modifications of the content of the tables and according to a specific table management, where the master station is always in one of three states that are either a waiting state, or a building state, or a transferring state, and specific communication rules for the slave stations and the master station.