Optimized square-root phase mask to generate defocus-invariant modulation transfer function in hybrid imaging systems

Van Nhu Le; Zhigang Fan; Nghia Pham Minh; Shouqian Chen

doi:10.1117/1.OE.54.3.035103

4 March 2015 Optimized square-root phase mask to generate defocus-invariant modulation transfer function in hybrid imaging systems

Van Nhu Le, Zhigang Fan, Nghia Pham Minh, Shouqian Chen

Author Affiliations +

Funded by: Natural Science Foundation of China, China National Natural Science Foundation, China Postdoctoral Science Foundation, Postdoctoral Science Foundation of Heilongjiang Province, Innovation Foundation of HIT, Innovation Foundation of Harbin Institute of Technology

Optical Engineering, Vol. 54, Issue 3, 035103 (March 2015). https://doi.org/10.1117/1.OE.54.3.035103

Abstract

Wavefront coding involves the use of an asymmetrical phase mask to extend the depth of field of incoherent imaging systems. The performance of wavefront coding systems depends on designing a suitable phase profile to generate the defocus-invariant imaging characteristic. We proposed a square-root phase mask with two profile factors for achieving a steadier defocused modulation transfer function (MTF). Several evaluation methods are employed for the purpose of performance comparison between the proposed phase mask and the previously suggested phase masks under the constraint condition that the phase parameters are optimized at the same level of noise gain. Numerical results show that the square-root phase mask yields better properties in extended depth of field imaging, especially in acquiring defocus-invariant MTFs and eliminating image artifacts associated with the decoded images.

Citation Download Citation

Van Nhu Le, Zhigang Fan, Nghia Pham Minh, and Shouqian Chen "Optimized square-root phase mask to generate defocus-invariant modulation transfer function in hybrid imaging systems," Optical Engineering 54(3), 035103 (4 March 2015). https://doi.org/10.1117/1.OE.54.3.035103

Published: 4 March 2015

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