Xavier DUCLOUX - Academia.edu (original) (raw)
Papers by Xavier DUCLOUX
SMPTE motion imaging journal, Nov 1, 2022
Computer communications and networks, 2018
The creation, distribution and delivery of video content is a sophisticated process with elements... more The creation, distribution and delivery of video content is a sophisticated process with elements like video acquisition, preprocessing and encoding, content production and packaging as well as distribution to customers. IP networks are usually used for the transfer of video signals. The treatment of video content is also very complex, and we have a multidimensional process with elements like content acquisition, content exchange and content distribution. The focus of the chapter is on the presentation of models that can be used to characterize the main elements in a video distribution chain. These models are about video coding and compression, video streaming, video traffic models, energy consumption models, system performance, concepts of performance optimization and QoE- and energy-optimal streaming.
SMPTE Motion Imaging Journal
been issued at the 107 th MPEG meeting. This contribution is proposing sample entry and sample fo... more been issued at the 107 th MPEG meeting. This contribution is proposing sample entry and sample formats
2016 Picture Coding Symposium (PCS), 2016
The creation, distribution and delivery of video content is a sophisticated process with elements... more The creation, distribution and delivery of video content is a sophisticated process with elements like video acquisition, preprocessing and encoding, content production and packaging as well as distribution to customers. IP networks are usually used for the transfer of video signals. The treatment of video content is also very complex, and we have a multidimensional process with elements like content acquisition, content exchange and content distribution. The focus of the chapter is on the presentation of models that can be used to characterize the main elements in a video distribution chain. These models are about video coding and compression, video streaming, video traffic models, energy consumption models, system performance, concepts of performance optimization and QoE- and energy-optimal streaming.
Device for recoding images according to a predetermined bit rate provided by a video stream compr... more Device for recoding images according to a predetermined bit rate provided by a video stream comprising image sequences initially coded according to at least one mode, comprising: - means for extracting information associated with recoding images representing said infomaciones, at least complexity (Xrecod) recoding of each image, - means for extracting information, especially on the complexity of recoding (Xinit) associated with the initial coding of images.
This invention relates to method for controlling the quality of video data to undergo coding and ... more This invention relates to method for controlling the quality of video data to undergo coding and decoding for maintaining a predetermined constant quality of the video data after decoding. The method is such that - at least a coder are received information representing the complexity of video data to be encoded, - For each video data to be encoded, calculating a reference quantization value based on said complexity, - is calculated and said encoder is transmitted for each video data to be coded, a reference throughput calculated as a function of the reference quantization value and the value of the predetermined constant quality, allowing the said coder to code each video data to obtain video data to said predetermined quality after decoding.
The invention relates to an image re-encoding device according to a given target rate of a video ... more The invention relates to an image re-encoding device according to a given target rate of a video stream comprising image sequences initially coded according to at least one mode. The device according to the invention comprises: - means for extracting information associated with the re-encoding of certain images, - means for extracting information, preferably encoding complexity associated with the initial coding of certain images, - means re-encoding each image according to the information associated with the re-encoding of certain images, and information associated with the initial coding of certain images.
SMPTE Motion Imaging Journal
The invention relates to a system for coding at least one video sequence S_e composed of a succes... more The invention relates to a system for coding at least one video sequence S_e composed of a succession of images so as to produce a f_s output stream. The system comprises a module (100) for cutting out the images of the sequence into N partitions said initial; a module (101) for determining N coding regions, a coding region comprising a primary partition and at least one additional partition adjacent said main partition; No coding modules (102-104) providing independent coding of the N coding regions to generate for each of them scores a multi-coding flows; a module (108) for extracting a main encoding stream for each multi-partitions encoding stream, a main encoding stream corresponding to the primary partition of the coding region associated therewith; a module (109) for generating a f_s output stream comprising the main encoding flow.
The present invention relates to a dynamic adaptation method of lossy coding of an audio stream a... more The present invention relates to a dynamic adaptation method of lossy coding of an audio stream and / or video (112) transmitted by a first device (101) to a remote device (102), said method comprising the steps of: remote device (102) receives and decodes said stream (112), said incoming flow, and transmits an output stream (111) comprising at least one indicator relating to a state of said remote device (102) which is modified by the execution of the decoding the incoming flow (112); the first device (101) receives the outflow (111) extracts said at least one indicator, and adjusts the encoding of the input stream (112) based on said at least one indicator extract. The process is particularly applicable to videoconferencing operated from PTAC energy in order to preserve the operating life of these terminals
The invention relates to a double pass encoding device of a video data stream comprising: - means... more The invention relates to a double pass encoding device of a video data stream comprising: - means (5, 6) encoding of a first type ensuring the first encoding pass, - means (2, 4) encoding a second type providing the second pass coding, According to the invention, - the means (2, 4) coding the second type are different from the means (5, 6) of first type encoding and- means (2, 4) for coding the second type using coding information from the first pass codage.Application coding in MPEG-2 and H.264.
SMPTE motion imaging journal, Nov 1, 2022
Computer communications and networks, 2018
The creation, distribution and delivery of video content is a sophisticated process with elements... more The creation, distribution and delivery of video content is a sophisticated process with elements like video acquisition, preprocessing and encoding, content production and packaging as well as distribution to customers. IP networks are usually used for the transfer of video signals. The treatment of video content is also very complex, and we have a multidimensional process with elements like content acquisition, content exchange and content distribution. The focus of the chapter is on the presentation of models that can be used to characterize the main elements in a video distribution chain. These models are about video coding and compression, video streaming, video traffic models, energy consumption models, system performance, concepts of performance optimization and QoE- and energy-optimal streaming.
SMPTE Motion Imaging Journal
been issued at the 107 th MPEG meeting. This contribution is proposing sample entry and sample fo... more been issued at the 107 th MPEG meeting. This contribution is proposing sample entry and sample formats
2016 Picture Coding Symposium (PCS), 2016
The creation, distribution and delivery of video content is a sophisticated process with elements... more The creation, distribution and delivery of video content is a sophisticated process with elements like video acquisition, preprocessing and encoding, content production and packaging as well as distribution to customers. IP networks are usually used for the transfer of video signals. The treatment of video content is also very complex, and we have a multidimensional process with elements like content acquisition, content exchange and content distribution. The focus of the chapter is on the presentation of models that can be used to characterize the main elements in a video distribution chain. These models are about video coding and compression, video streaming, video traffic models, energy consumption models, system performance, concepts of performance optimization and QoE- and energy-optimal streaming.
Device for recoding images according to a predetermined bit rate provided by a video stream compr... more Device for recoding images according to a predetermined bit rate provided by a video stream comprising image sequences initially coded according to at least one mode, comprising: - means for extracting information associated with recoding images representing said infomaciones, at least complexity (Xrecod) recoding of each image, - means for extracting information, especially on the complexity of recoding (Xinit) associated with the initial coding of images.
This invention relates to method for controlling the quality of video data to undergo coding and ... more This invention relates to method for controlling the quality of video data to undergo coding and decoding for maintaining a predetermined constant quality of the video data after decoding. The method is such that - at least a coder are received information representing the complexity of video data to be encoded, - For each video data to be encoded, calculating a reference quantization value based on said complexity, - is calculated and said encoder is transmitted for each video data to be coded, a reference throughput calculated as a function of the reference quantization value and the value of the predetermined constant quality, allowing the said coder to code each video data to obtain video data to said predetermined quality after decoding.
The invention relates to an image re-encoding device according to a given target rate of a video ... more The invention relates to an image re-encoding device according to a given target rate of a video stream comprising image sequences initially coded according to at least one mode. The device according to the invention comprises: - means for extracting information associated with the re-encoding of certain images, - means for extracting information, preferably encoding complexity associated with the initial coding of certain images, - means re-encoding each image according to the information associated with the re-encoding of certain images, and information associated with the initial coding of certain images.
SMPTE Motion Imaging Journal
The invention relates to a system for coding at least one video sequence S_e composed of a succes... more The invention relates to a system for coding at least one video sequence S_e composed of a succession of images so as to produce a f_s output stream. The system comprises a module (100) for cutting out the images of the sequence into N partitions said initial; a module (101) for determining N coding regions, a coding region comprising a primary partition and at least one additional partition adjacent said main partition; No coding modules (102-104) providing independent coding of the N coding regions to generate for each of them scores a multi-coding flows; a module (108) for extracting a main encoding stream for each multi-partitions encoding stream, a main encoding stream corresponding to the primary partition of the coding region associated therewith; a module (109) for generating a f_s output stream comprising the main encoding flow.
The present invention relates to a dynamic adaptation method of lossy coding of an audio stream a... more The present invention relates to a dynamic adaptation method of lossy coding of an audio stream and / or video (112) transmitted by a first device (101) to a remote device (102), said method comprising the steps of: remote device (102) receives and decodes said stream (112), said incoming flow, and transmits an output stream (111) comprising at least one indicator relating to a state of said remote device (102) which is modified by the execution of the decoding the incoming flow (112); the first device (101) receives the outflow (111) extracts said at least one indicator, and adjusts the encoding of the input stream (112) based on said at least one indicator extract. The process is particularly applicable to videoconferencing operated from PTAC energy in order to preserve the operating life of these terminals
The invention relates to a double pass encoding device of a video data stream comprising: - means... more The invention relates to a double pass encoding device of a video data stream comprising: - means (5, 6) encoding of a first type ensuring the first encoding pass, - means (2, 4) encoding a second type providing the second pass coding, According to the invention, - the means (2, 4) coding the second type are different from the means (5, 6) of first type encoding and- means (2, 4) for coding the second type using coding information from the first pass codage.Application coding in MPEG-2 and H.264.