Approximate analytical optical transfer function for a wavefront-coded imaging system with two-dimensional rectangularly separable phase masks

Hui Zhao; Yingcai Li

doi:10.1117/1.3485759

1 September 2010 Approximate analytical optical transfer function for a wavefront-coded imaging system with two-dimensional rectangularly separable phase masks

Hui Zhao, Yingcai Li

Author Affiliations +

Optical Engineering, Vol. 49, Issue 9, 093201 (September 2010). https://doi.org/10.1117/1.3485759

Abstract

Wavefront coding can be used to extend the depth of field of incoherent imaging systems and is a powerful system-level technique. In order to assess the performance of a wavefront-coded imaging system, defocused optical transfer function (OTF) is the metric frequently used. Unfortunately, to the best of our knowledge, among all types of phase masks, it is usually difficult to obtain the analytical OTF except the cubic one. Although numerical computation seems good enough for performance evaluation, the approximate analytical OTF is still indispensable because it can reflect the relationship between mask parameters and system frequency response in a clearer way. Thus, a method is proposed to derive the approximate analytical OTF for two-dimensional rectangularly separable phase masks. The analytical results are well consistent with the direct numerical computations, but the proposed method can be accepted only from engineering point of view and needs rigorous proof in future.

©(2010) Society of Photo-Optical Instrumentation Engineers (SPIE)

Citation Download Citation

Hui Zhao and Yingcai Li "Approximate analytical optical transfer function for a wavefront-coded imaging system with two-dimensional rectangularly separable phase masks," Optical Engineering 49(9), 093201 (1 September 2010). https://doi.org/10.1117/1.3485759

Published: 1 September 2010

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