Inverse problem approach in Particle Digital Holography : out-of-field particle detection made possible

Ferréol Soulez 1, 2 Loïc Denis 1, 3 Éric Thiébaut 2 Corinne Fournier 1 Charles Goepfert 4
1 LHC - Laboratoire Hubert Curien [Saint Etienne]
2 CRAL - Centre de Recherche Astrophysique de Lyon
3 LTCI - Laboratoire Traitement et Communication de l'Information
4 LMFA - Laboratoire de Mecanique des Fluides et d'Acoustique
Abstract : We propose a microparticle detection scheme in digital holography. In our inverse problem approach, we estimate the optimal particles set that best models the observed hologram image. Such a method can deal with data that have missing pixels. By considering the camera as a truncated version of a wider sensor, it becomes possible to detect particles even out of the camera field of view. We tested the performance of our algorithm against simulated and experimental data for diluted particle conditions. With real data, our algorithm can detect particles far from the detector edges in a working area as large as 16 times the camera field of view. A study based on simulated data shows that, compared with classical methods, our algorithm greatly improves the precision of the estimated particle positions and radii. This precision does not depend on the particle's size or location (i.e., whether inside or outside the detector field of view).
Keywords : Inverse problems digital holography
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UNIV-ST-ETIENNE | LAHC | INSU | EC-LYON | INSA-LYON | INSTITUT-TELECOM | LMFA | PARISTECH | ENS-LYON | CRAL | UNIV-LYON1 | IOGS | INSA-GROUPE | LTCI

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Ferréol Soulez, Loïc Denis, Éric Thiébaut, Corinne Fournier, Charles Goepfert. Inverse problem approach in Particle Digital Holography : out-of-field particle detection made possible. Journal of the Optical Society of America. A Optics, Image Science, and Vision, Optical Society of America, 2007, 24 (12), pp.3708-3716. ⟨10.1364/JOSAA.24.003708⟩. ⟨ujm-00192619⟩

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