14 October 2014 Adaptive spatial filtering based on region growing for automatic analysis in digital holographic microscopy
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Optical Engineering, 54(3), 031103 (2014). doi:10.1117/1.OE.54.3.031103
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.
© 2015 Society of Photo-Optical Instrumentation Engineers (SPIE)
Jiansu Li, Zhao Wang, Jianmin Gao, Yun Liu, Junhui Huang, "Adaptive spatial filtering based on region growing for automatic analysis in digital holographic microscopy," Optical Engineering 54(3), 031103 (14 October 2014). http://dx.doi.org/10.1117/1.OE.54.3.031103
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KEYWORDS
Spatial filters

Digital holography

Holograms

3D image reconstruction

Optical filters

Digital filtering

Holography

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