Adaptive correction method of inhomogeneous light intensity for digital speckle interferometry by subtraction
Applied Optics, Vol. 48, Issue 33, pp. 6426-6431 (2009)
http://dx.doi.org/10.1364/AO.48.006426
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Abstract
In digital speckle interferometry, subtracted fringe patterns are always influenced by inhomogeneous light that is reflected from the tested object and received by the CCD. In this paper, by analyzing speckle’s statistic property, we propose a numerical processing method to correct this nonuniform light intensity distribution within adaptive windows. This method includes estimating light intensity distribution of the tested object, constructing an adaptive window for every pixel, and correcting the intensity in the adaptive windows. By applying this method to our experiment, we find it is valid for intensity correction without changing necessary phase information.
© 2009 Optical Society of America
OCIS Codes
(100.2000) Image processing : Digital image processing
(100.2650) Image processing : Fringe analysis
(120.6150) Instrumentation, measurement, and metrology : Speckle imaging
(120.6160) Instrumentation, measurement, and metrology : Speckle interferometry
ToC Category:
Instrumentation, Measurement, and Metrology
History
Original Manuscript: April 23, 2009
Revised Manuscript: August 22, 2009
Manuscript Accepted: September 28, 2009
Published: November 10, 2009
Citation
Bin Gu, Dexing Yang, Dongsheng He, Shuai Guo, Zhichun Yang, and Zhiqiang Fang, "Adaptive correction method of inhomogeneous light intensity for digital speckle interferometry by subtraction," Appl. Opt. 48, 6426-6431 (2009)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-48-33-6426
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