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Cesson-Sévigné, France

Pinson M.H.,National Telecommunications and Information Administration NTIA | Schmidmer C.,OPTICOM | Janowski L.,AGH University of Science and Technology | Pepion R.,University of Nantes | And 6 more authors.
2013 5th International Workshop on Quality of Multimedia Experience, QoMEX 2013 - Proceedings

In 2011, the Video Quality Experts Group (VQEG) ran subjects through the same audiovisual subjective test at six different international laboratories. That small dataset is now publically available for research and development purposes. © 2013 IEEE. Source

Bartczak B.,University of Kiel | Vandewalle P.,Philips | Grau O.,BBC Research and Development | Briand G.,Technicolor RandD France | And 7 more authors.
IEEE Transactions on Broadcasting

This paper discusses an approach to 3D-Television that is based on the Layered Depth Video (LDV) format. The LDV format contains explicit depth and occlusion information, allowing for the generation of novel viewpoints for stereoscopic and auto-stereoscopic multi-view displays. Thus, the format is effectively invariant to the display type and also allows the depth impression to be easily changed to best meet viewers' preferences for visual comfort. The major aspects of a content delivery chain based on the LDV format are discussed in this paper. The requirements placed on data acquisition are introduced, and a multi-camera system, which is well suited for LDV compliant data capture, is presented. Also discussed is the conversion of different input data streams, like standard stereo videos, multi-view data supplemented by depth data, and videos from wide baseline setups, to the LDV format. Moreover, the advantages of the LDV format in editing and mixing are examined. The paper also presents a transmission system based on currently available coding and transmission standards. Optimization of the bandwidth via different approaches to the compression of the LDV signal is analyzed, and the results of conducted experiments in this field are discussed. Finally, the aspects of perceptual human factors for the proper evaluation of 3D-TV services and the implemented LDV system are examined. This contribution reflects the efforts of the EU-funded project 3D4YOU to unify all aspects of 3D-TV production. © 2011 IEEE. Source

Rolland-Neviere X.,Technicolor RandD France | Doerr G.,Technicolor RandD France | Alliez P.,French Institute for Research in Computer Science and Automation
ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings

Radial-based 3D watermarking alters the distances between the center of mass of the 3D mesh and its vertices. These watermarking systems are inherently sensitive to cropping. To address this limitation, this paper introduces a complementary blind resynchronization module to transmit critical synchronization information to the watermark decoder. Spherical patterns formed by several secret landmark vertices are embedded alongside the payload and blindly retrieved by the decoder, thereby conveying the synchronization information needed. Experimental results showcase significant improvement against cropping, while preserving performances against valumetric attacks thanks to a control parameter that automatically switches between alternate resynchronization modes. © 2015 IEEE. Source

Penet C.,Technicolor RandD France | Demarty C.-H.,Technicolor RandD France | Gravier G.,French National Center for Scientific Research | Gros P.,French Institute for Research in Computer Science and Automation
Proceedings - International Workshop on Content-Based Multimedia Indexing

This article investigates a novel use of the well-known audio words representations to detect specific audio events, namely gunshots and explosions, in order to get more robustness towards soundtrack variability in Hollywood movies. An audio stream is processed as a sequence of stationary segments. Each segment is described by one or several audio words obtained by applying product quantization to standard features. Such a representation using multiple audio words constructed via product quantisation is one of the novelties described in this work. Based on this representation, Bayesian networks are used to exploit the contextual information in order to detect audio events. Experiments are performed on a comprehensive set of 15 movies, made publicly available. Results are comparable to the state of the art results obtained on the same dataset but show increased robustness to decision thresholds, however limiting the range of possible operating points in some conditions. Late fusion provides a solution to this issue. © 2013 IEEE. Source

Rolland-Neviere X.,Technicolor RandD France | Doerr G.,Technicolor RandD France | Alliez P.,French Institute for Research in Computer Science and Automation
2014 IEEE International Conference on Image Processing, ICIP 2014

Modulating the distances between the vertices and the center of mass of a triangular mesh is a popular approach to watermark 3D objects. Prior work has formulated this approach as a quadratic programming problem which minimizes the geometric distortion while embedding the watermark payload in the histogram of distances. To enhance this framework, we introduce two watermarking components, namely the spread transform and perceptual shaping based on roughness information. Benchmarking results showcase the benefits of these addons with respect to the fidelity-robustness trade-off. © 2014 IEEE. Source

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