Principal Scientist



What's New:

Internship, PhD and Post-doc positions are available on video compression, in particular for the funny part on next generation coding tools.



I am currently working on video and signal compression for:

  • high dynamic range videos, from content generation to compressed bit-streams. This includes inventing new compression schemes able to cope with floating or high-dynamic-inter data, but also thinking of backward compatibility with legacy 8-10 bit coders. These solutions are naturally pushed into standards for video compression and distribution.
    This topic is in close synergy with research activities on perception of colors and light by humans.


  • future video coding tools to obtain compression capabilities beyond one can get now by using h264, HEVC and VP9. We strongly believe that there is still much room for improvement while maintaining a decent complexity.  


Short Bio

Technicolor R&I Rennes (France), 2013-present

Joined Technicolor R&I at the Imaging Science Lab in April 2013. Working in the Compression & New Video Format technology area.


Canon Research Centre (France), 2007-2013

The first two years, worked mainly on digital audio and transducers. Modeling of loudspeakers including multi-dimensional electromagnetism, acoustics, aero-acoustic turbulence, and also electroacoustic. Modeling of acoustical material (porosity, etc.) used in loudspeakers and anechoic rooms. Development of a simulation and optimization code for listening rooms coupled with automatic audio signal processing by digital filters. Development of a measurement tool to validate simulation results. Published 9 patents.

Then, three years and a half on video compression, mainly upstream by inventing new compression schemes but also downstream in standardization. Research on new mathematical methods dedicated to video compression, development of high performance codes for video compression/decompression. Author of a response to the Call for Proposal for HEVC scalable extension (contribution JCTVC-K0041). Presentation and defense of Canon technologies in standardization meetings. Promotion of new solutions to our Japanese headquarter. About 35 patents published or filed.

Multi time winner of both Canon CRF inventor prizes for the best invention and the best inventor.


Postdoctoral fellow, University of Osaka, Institute for Laser Engineering (Japan), 2004-2006

Modeling and development of a simulator for very high energy plasma. Development of a 2D cylindrical code, for the simulation of laser-created shocks including hydrodynamics, ionization, collisions, electromagnetism, radiation, etc. Also, development of new models for laser-created low density plasma and design of experiments for a very high energy laser.



Received the B.Sc and M.Sc. degrees in Mathematics from University of Strasbourg, University of Versailles St Quentin and Ecole Normale Supérieure de Lyon, France, in 2000 and 2002 respectively. Ancien Eleve of Ecole Normale Supérieure de Lyon, France.

Received the Dr. Philos Degree in Applied Mathematics from University Pierre et Marie Curie, Paris and Commissariat à l’Energie Atomique, France, in 2005. Title : Mathematical and Numerical Study of Models for Compressible Turbulence. Dealing mainly with Partial Differential Equations and related discrete schemes for multi-dimensional physical simulations.


Research Interests:

Mathematics, applied mathematics for physics, information theory, video compression, numerical simulation, High Dynamic Range workflow.


Latest publications


Improved Coefficient Coding for Adaptive Transforms in HEVC

Saurabh Puri, SEBASTIEN LASSERRE, Patrick Le Callet

PCS 2016
December 04, 2016


Single-layer HDR video coding with SDR backward compatibility

September 27, 2016

High Dynamic Range and Wide Color Gamut video standardization - status and perspectives

High Dynamic Range Video - 1st Edition
April 04, 2016


HDR Video Coding based on Local LDR Quantization

David Touzé, Yannick Olivier, SEBASTIEN LASSERRE, Fabrice Leléannec, Ronan Boitard, Edouard François

HDRi2014 - Second International Conference and SME Workshop on HDR imaging
March 05, 2014