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1 March 2021 Theoretical and experimental analysis of co-designed binary phase masks for enhancing the depth of field of panchromatic cameras
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Abstract

We investigate the depth of field (DoF) enhancing capacity of binary annular phase masks embedded in panchromatic imaging systems. We first demonstrate with numerical simulations and real-world imaging experiments that phase masks optimized for monochromatic illumination are somewhat robust to their use under wide spectrum illumination: they provide images that are slightly less sharp but less affected by deconvolution artifacts due to spectral averaging. Then, we show that masks specifically optimized for wide spectrum illumination perform better under this type of illumination than monochromatically optimized phase masks under monochromatic illumination, especially when the targeted DoF range is large. This interesting effect comes from the fact that deconvolution artifacts are significantly reduced by wide spectrum illumination. These results show that it is useful to take into account the illumination spectrum together with the scene characteristics and the targeted DoF range for effective co-design of DoF enhancing imaging systems.

© 2021 Society of Photo-Optical Instrumentation Engineers (SPIE) 0091-3286/2021/$28.00 © 2021 SPIE
Alice Fontbonne, Hervé Sauer, and François Goudail "Theoretical and experimental analysis of co-designed binary phase masks for enhancing the depth of field of panchromatic cameras," Optical Engineering 60(3), 033101 (1 March 2021). https://doi.org/10.1117/1.OE.60.3.033101
Received: 30 October 2020; Accepted: 10 February 2021; Published: 1 March 2021
JOURNAL ARTICLE
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