What is the depth of field reachable in practice with generic binary phase masks and digital deconvolution?

Fontbonne, Alice; Sauer, Hervé; Kulcsár, Caroline; Coutrot, Anne-Lise; Goudail, François

doi:10.1117/12.2557731

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2022

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“…Among the many existing types of DOF extending masks, annular binary phase masks are easy to manufacture, and can be co-optimized with a simple Wiener deconvolution filter. Their performance and robustness have been characterized theoretically and experimentally in the case of monochromatic illumination [9,11,12]. However, the question remains of their efficiency under wide spectrum illumination [19,18,8].…”

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confidence: 99%

End-to-end optimization of optical systems with extended depth of field under wide spectrum illumination

2022

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We study a way to take into account the scene illumination spectrum during end-to-end optimization of optical-digital hybrid systems that include annular binary phase masks to enhance their depth of field (DoF). We show that a phase mask specifically optimized for wide spectrum panchromatic imaging performs better under this type of illumination than phase masks optimized under monochromatic illumination assumption. Indeed, thanks to spectral averaging, the modulation transfer functions of such a phase mask are very close to each other. This guarantees a very homogeneous image quality across the DoF range, which we demonstrate theoretically and experimentally using a dedicated optical setup.

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