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17 May 2022 Mid-infrared speckle reduction technique for hyperspectral imaging
Maroun Hjeij, Luiz Poffo, Bastien Billiot, Ronan Le Page, Pascal Besnard, Jean-Marc Goujon
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Proceedings Volume 12138, Optics, Photonics and Digital Technologies for Imaging Applications VII; 121380F (2022) https://doi.org/10.1117/12.2621817
Event: SPIE Photonics Europe, 2022, Strasbourg, France
Abstract
Recently, we proposed an active mid-infrared (MIR) hyperspectral imaging system for early detection of plant water stress. A quantum cascade tunable laser powered this stand-off detection system, in which “speckle” in images due to coherent nature of laser radiation. The speckle affects the spatial resolution of the images. In this article, we evaluate several speckle suppression methods suitable for the mid-infrared region. To quantify the reduction of speckle, we compare their spatial contrast. We combined optical techniques and showed their ability to reduce the speckle contrast from its initial value 0.413 down to 0.11, representing a 73% reduction
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Maroun Hjeij, Luiz Poffo, Bastien Billiot, Ronan Le Page, Pascal Besnard, and Jean-Marc Goujon "Mid-infrared speckle reduction technique for hyperspectral imaging", Proc. SPIE 12138, Optics, Photonics and Digital Technologies for Imaging Applications VII, 121380F (17 May 2022); https://doi.org/10.1117/12.2621817
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KEYWORDS
Speckle
Mid-IR
Hyperspectral imaging
Image processing
Tunable lasers
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