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Theses

Conception conjointe de l'optique et du traitement pour l'optimisation des systèmes d'imagerie

Marie-Anne Burcklen 1, 2
Abstract : Imaging systems are now complex instruments where lens, sensor and digital processing interact strongly together. In order to obtain better imaging performance than conventional imaging, it has become necessary to take into account this interaction in the design stage and therefore to optimize jointly optical and digital parameters. The objective of my thesis is to develop joint optical-digital optimization methods in order to obtain imaging systems with higher performance and lower complexity. I first considered extending the depth of field of an already existing lens. A binary phase mask has been inserted in the vicinity of the aperture stop of a f/1.2 lens, and it has been optimized jointly with a deconvolution filter using the restored image quality criterion. The increase in depth of field has been quantified, and modulation transfer function measurements have proved experimentally the efficiency of this unconventional imaging system. During this first study only the phase mask was optimized. To further increase the imaging system efficiency, all the optical parameters need to be optimized. However, optical design is a complex problem in which specific constraints have to be taken into account and for which one needs to use a dedicated software. In this thesis I used the Code V optical design software. Since the image quality-based optimization cannot be easily implemented in this type of software, I proposed a new criterion. It is based on classical optical optimization criteria used in Code V that have been modified in order to take into account deconvolution in a implicit manner. This design method has been first validated on the optimization of a phase mask for depth of field extension of an already existing lens. Results were similar to those given by the image quality-based optimization. Then this method has been used to enhance a very fast f/0.75 lens: by modifying its optical parameters, the lens has been simplified, and the image quality has been homogenized over the field. Eventually I applied this joint design method to solve the important problem of thermal sensitivity of an 8-12 µm infrared system. By using this method I designed from scratch several types of short and long focal length athermalized lenses. The obtained lenses are simpler than conventionally athermalized ones while having similar or even higher imaging performance.
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Marie-Anne Burcklen. Conception conjointe de l'optique et du traitement pour l'optimisation des systèmes d'imagerie. Optique [physics.optics]. Université Paris Saclay (COmUE), 2018. Français. ⟨NNT : 2018SACLO001⟩. ⟨tel-02918118⟩

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