A new autofocus method based on angular spectrum method in digital holography

Zhaomin Wang; Weijuan Qu; Fang Yang; Yongfu Wen; Asundi Anand

doi:10.1117/12.2076853

19 February 2015 A new autofocus method based on angular spectrum method in digital holography

Zhaomin Wang, Weijuan Qu, Fang Yang, Yongfu Wen, Asundi Anand

Proceedings Volume 9449, The International Conference on Photonics and Optical Engineering (icPOE 2014); 94492H (2015) https://doi.org/10.1117/12.2076853
Event: The International Conference on Photonics and Optical Engineering and the Annual West China Photonics Conference (icPOE 2014), 2014, Xi'an, China

Abstract

The determination of numerical reconstruction distance is key to recover the wavefront at focal plane in digital holography. In this paper, we propose a new autofocus method based on angular spectrum method (ASM). The proposed method takes successive Fourier transform after 1^st order spectrum selection, and then calculates the summation. It saves operations compared to classic autofocus functions. When an exhaustive z-axis search is performed, the proposed method obtains unimodality coincided with the results from four classic autofocus functions. Moreover, the proposed method is more time-effective, which is the optimal one for ASM.

Citation Download Citation

Zhaomin Wang, Weijuan Qu, Fang Yang, Yongfu Wen, and Asundi Anand "A new autofocus method based on angular spectrum method in digital holography", Proc. SPIE 9449, The International Conference on Photonics and Optical Engineering (icPOE 2014), 94492H (19 February 2015); https://doi.org/10.1117/12.2076853

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