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Conception conjointe combinaison optique / traitement : Une nouvelle approche de la conception optique de haut niveau

Alice Fontbonne 1 
Abstract : Today, most of the imaging systems consist of a complex optical system, a detector and a digital processing. Conventionally, these blocks are optimized separately from each other, with different criteria. This thesis studies the possibility of jointly optimizing the parameters of the optics and the digital processing, a method referred to as co-design. A first approach to co-design consists in the use of co-optimized phase masks to increase the depth of field of an imaging system. This thesis shows experimentally that the masks optimized with the generic model used have exactly the desired performance. It is also shown that these masks are robust to a low amount of optical aberration, and to their use with a wide spectrum thanks to spectral averaging. The second objective of this thesis is to develop and compare methods for co-designing more complex optical systems using professional optical system design software. By comparing a conventional optimization method, a method that implicitly takes into account the digital processing applied to the image and a method that explicitly takes into account the processing in the optimization criterion, we show that the most efficient co-optimization method is the one that explicitly takes into account the digital processing. The obtained results can be improved a posteriori by using a zonal deconvolution, a restoration method allowing to take into account the spatial variation of the PSF in the field, and to partially compensate for the inhomogeneities of performance in the field due to the imaging system only. We show that using a small number of areas for the piecewise-constant deconvolution is sufficient to restore the images of co-designed systems while a more elaborate digital post-processing algorithm must be used for a conventional system.
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Submitted on : Friday, December 17, 2021 - 11:48:07 AM
Last modification on : Sunday, June 26, 2022 - 3:26:03 AM
Long-term archiving on: : Friday, March 18, 2022 - 6:53:12 PM


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  • HAL Id : tel-03485432, version 1


Alice Fontbonne. Conception conjointe combinaison optique / traitement : Une nouvelle approche de la conception optique de haut niveau. Optique [physics.optics]. Université Paris-Saclay, 2021. Français. ⟨NNT : 2021UPAST104⟩. ⟨tel-03485432⟩



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