PhD Defense Julie Rivet


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Vendredi 17 Juillet 2020
à 14h
EPITA, 14-16 Rue Voltaire, 94270 Le Kremlin-Bicêtre
Amphi 401
Plan d’accès :

Non-iterative methods for image improvement in digital holography of the retina


With the increase of the number of people with moderate to severe visual impairment, monitoring and treatment of vision disorders have become major issues in medicine today. At the Quinze-Vingts national ophthalmology hospital in Paris, two optical benches have been settled in recent years to develop two real-time digital holography techniques for the retina: holographic optical coherence tomography (OCT) and laser Doppler holography. The first reconstructs three-dimensional images, while the second allows visualization of blood flow in vessels. Besides problems inherent to the imaging system itself, optical devices are subject to external disturbance, bringing also difficulties in imaging and loss of accuracy. The main obstacles these technologies face are eye motion and eye aberrations. In this thesis, we have introduced several methods for image quality improvement in digital holography, and validated them experimentally. The resolution of holographic images has been improved by robust non-iterative methods: lateral and axial tracking and compensation of translation movements, and measurement and compensation of optical aberrations. This allows us to be optimistic that structures on holographic images of the retina will be more visible and sharper, which could ultimately provide very valuable information to clinicians.

Keywords: Image processing, signal processing, digital holography, retinal imaging, deep learning

Composition du Jury :

Rapporteurs :

  • Gilles TESSIER, Pr., Sorbonne Université, Institut de la Vision
  • Corinne FOURNIER, MdC, Université Jean-Monnet-Saint-Étienne, Laboratoire Hubert Curien

Examinateurs :

  • Hubert CANTALLOUBE, Ingénieur de recherche, ONERA
  • Claude BOCCARA, Pr., Sorbonne Université, Institut Langevin

Encadrants :

  • Thierry GERAUD, Pr., EPITA, LRDE
  • Michel PAQUES, Pr., Sorbonne Université, Centre hospitalier national d'ophtalmologie des Quinze-Vingts
  • Guillaume TOCHON, MdC, EPITA, LRDE
  • Serge MEIMON, Ingénieur de recherche, ONERA
  • Michael ATLAN, chargé de recherche, Institut Langevin