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Optical Engineering

Adaptive spatial filtering based on region growing for automatic analysis in digital holographic microscopy
Author(s): Jiansu Li; Zhao Wang; Jianmin Gao; Yun Liu; Junhui Huang
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Paper Abstract

The adaptive spatial filtering method is commonly adopted to extract the +1 term spectrum in digital holography for real-time dynamic analysis. However, the typical filtering method is not satisfactory for automatic analysis, because the reset of the filtering window is needed to extract the area of the +1 term spectrum. Therefore, an adaptive spatial filtering method based on region growing and the characteristic of the spectrum separation is proposed. Its filtering window is automatically formed by region growing. The key parameters, including threshold and seed point, are set by the intensity distribution of the hologram spectrum. Then the adaptive filtering extracting the +1 term spectrum is realized by multiplying the hologram spectrum by the filtering window. Compared to the typical filtering method, the experimental results of a microhole array and a phase step show that the proposed method has better adaptability and a higher precision. Moreover, the applicability of this method for different uses is also demonstrated by experiments with a microhole array and a phase step.

Paper Details

Date Published: 14 October 2014
PDF: 10 pages
Opt. Eng. 54(3) 031103 doi: 10.1117/1.OE.54.3.031103
Published in: Optical Engineering Volume 54, Issue 3
Show Author Affiliations
Jiansu Li, Xi'an Jiaotong Univ. (China)
Zhao Wang, Xi'an Jiaotong Univ. (China)
Jianmin Gao, Xi'an Jiaotong Univ. (China)
Yun Liu, Xi'an Jiaotong Univ. (China)
Junhui Huang, Xi'an Jiaotong Univ. (China)

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