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Opt Express. 2011 Sep 12;19(19):18207-15. doi: 10.1364/OE.19.018207.

Adaptive noise reduction method for DSPI fringes based on bi-dimensional ensemble empirical mode decomposition.

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State Key Laboratory of Mechanical System and Vibration, Shanghai Jiao Tong University, Shanghai, China.


Digital speckle pattern interferometry (DSPI) fringes contain low spatial information degraded with speckle noise and background intensity. The denoising technique proposed recently based on bi-dimensional empirical mode decomposition (BEMD) could implement noise reduction adaptively. However, the major drawback of BEMD, called mode mixing, has affected its practical application. With noise-assisted data analysis (NADA) method, bi-dimensional ensemble empirical mode decomposition (BEEMD) was proposed, which has solved the problem of mode mixing. The denoising approach based on BEEMD will be presented, compared with other classic denoising methods and evaluated both qualitatively and quantitatively using computer-simulated and experimental DSPI fringes.

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