Share Email Print
cover

Proceedings Paper

A new autofocus method based on angular spectrum method in digital holography
Format Member Price Non-Member Price
PDF $14.40 $18.00

Paper 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 1st 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.

Paper Details

Date Published: 19 February 2015
PDF: 7 pages
Proc. SPIE 9449, The International Conference on Photonics and Optical Engineering (icPOE 2014), 94492H (19 February 2015); doi: 10.1117/12.2076853
Show Author Affiliations
Zhaomin Wang, Ngee Ann Polytechnic (Singapore)
Nanyang Technological Univ. (Singapore)
Weijuan Qu, Ngee Ann Polytechnic (Singapore)
Fang Yang, Ngee Ann Polytechnic (Singapore)
Yongfu Wen, Ngee Ann Polytechnic (Singapore)
Asundi Anand, Nanyang Technological Univ. (Singapore)


Published in SPIE Proceedings Vol. 9449:
The International Conference on Photonics and Optical Engineering (icPOE 2014)
Ailing Tian; Anand Asundi; Weiguo Liu; Chunmin Zhang, Editor(s)

© SPIE. Terms of Use
Back to Top