Digital speckle pattern interferometry;
Speckle noise;
Denoising;
Fast bi-dimensional ensemble empirical;
mode decomposition;
BIMF energy estimation;
SPECKLE-PATTERN INTERFEROMETRY;
WAVELET TRANSFORM;
NOISE-REDUCTION;
SIGNALS;
DEFORMATIONS;
FILTER;
D O I:
10.1016/j.ymssp.2012.09.009
中图分类号:
TH [机械、仪表工业];
学科分类号:
0802 ;
摘要:
Digital speckle pattern interferometry (DSPI) is a new and efficient technique for measuring the difference in out-of-plane displacement. However, DSPI fringes contain low spatial information degraded with random speckle noise and background intensity. A denoising scheme based on fast bi-dimensional ensemble empirical mode decomposition (FBEEMD) and energy estimation of bi-dimensional intrinsic mode function (BIMF) is proposed to reduce speckle noise in this paper. Furthermore, the denoising scheme is compared with other denoising methods, and evaluated quantitatively using computer-simulated and experimental DSPI fringes. (C) 2012 Elsevier Ltd. All rights reserved.