Presentation of our research fields
Our group develops innovative imaging systems that take into account the physical properties of observed scenes and optimize the optical system that forms the image and the digital processing that extracts information. This approach involves both theoretical developments and experimental implementations.
We address theoretical and experimental issues in close relation with technologies and applications: remote sensing, astronomy, biomedical imaging or industrial inspection. Our activity thus brings into play multidisciplinary skills and is performed in close relation with companies (Essilor, Thales, Sagem, Imaging Eyes, …) and applied research institutes in France (ONERA, Quinze-Vingts Hospital in Paris, Paris-Meudon observatory,…) and abroad (Durham university, Gemini observatory,…).
Polarization imaging consists in forming an image of the polarization state of the light scattered by a scene. It can reveal contrasts invisible to human eyes and conventional image sensors. We develop agile polarization imaging systems that can adapt to the observed scene thanks to polarization modulators controlled by image processing algorithms. Read more.
Adaptive Optics (AO) was first used in astronomy to compensate for the wavefront deformations induced by atmospheric turbulence, which is the major factor limiting the resolution of ground-based telescopes. A deformable mirror, inserted in the optical path, is controlled in real-time using measurements of the wavefront deformation provided by a wavefront sensor. With the possibilities offered by recent technology, AO has been developed in other fields of applications, like retinal imaging, microscopy, optical communications… We are specialized in the modeling and high performance control of adaptive optics systems, including perturbation modeling and performance characterization. Read more.
Nowadays, imaging systems integrate high performance, miniaturized optical system with high level image processing algorithms. In order to optimize their global performance, the optical system and the algorithms have to be jointly optimized. This new approach bears the name of “co-design”. We are carrying out several projects involving this “codesign” approach. They include new theoretical findings and experimental demonstrations. Read more.