Phase-based Algorithm for 2D Displacement Estimation of Laser Speckle Patterns

Robust, computationally efficient and accurate estimation of 2D speckle pattern displacement is the key signal processing task in most digital speckle photography principles. State-of-the-art techniques are based on the evaluation of correlation functions with high computational complexity when sub-...

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Bibliographic Details
Published in2008 IEEE Instrumentation and Measurement Technology Conference pp. 2173 - 2178
Main Authors Thurner, T., Zechner, C.
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.05.2008
Subjects
Adaptive optics
cross-correlation
estimation
laser speckles
Light scattering
Optical scattering
Optical signal processing
Optical surface waves
Phase estimation
Rough surfaces
Signal processing
Signal processing algorithms
Speckle
speckle signal processing
speckle tracking
Surface roughness
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ISBN9781424415403
1424415403
ISSN1091-5281
DOI10.1109/IMTC.2008.4547408

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Summary:Robust, computationally efficient and accurate estimation of 2D speckle pattern displacement is the key signal processing task in most digital speckle photography principles. State-of-the-art techniques are based on the evaluation of correlation functions with high computational complexity when sub-pixel accuracy is needed. Within this paper we describe a new algorithm based on the evaluation of 2D phase data of laser speckle patterns, capable of estimating 2D speckle pattern displacement with reduced computational effort but high resolution when compared to correlation-based processing methods. Using our new algorithm, the resolution and measurement rate of some digital speckle photography principles could be noticeably improved.
ISBN:9781424415403
1424415403
ISSN:1091-5281
DOI:10.1109/IMTC.2008.4547408