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Fringe-contoured-window sine/cosine filter for saw-tooth phase maps in ESPI |
Sihua FU1(), Xuejun LONG1, Hui LIN2, Qifeng YU1 |
1. College of Opto-electronic Science and Engineering, National University of Defense Technology; 2. Institute of Space and Earth Information Science, The Chinese University of Hong Kong |
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Abstract In electronic speckle pattern interferometry (ESPI), because saw-tooth phase map obtained by phase-shifting is inherently full of speckle noise, noise reduction should be carried out to suppress high-level noise before it is unwrapped. In accordance with the feature of the saw-tooth phase map, an adaptive filter method combining the classical sine/cosine filter and the fringe orientation information of the phase map is developed. A fringe orientation map is first generated from the saw-tooth phase map, and then a fringe-contoured window is derived accordingly. Finally, filtering is carried out within the window. Compared with existing filters, it has a better performance on phase jump information preservation without any blurring effect on phase distribution provided that filtering is implemented on the equal-phase window. Moreover, its capability for noise reduction is more powerful. The effectiveness and advantages of the novel filter have been also verified by both simulated and real saw-tooth phase maps.
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Keywords
optical measurement
electronic speckle pattern interferometry (ESPI)
phase-shifting
saw-tooth phase map
filtering
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Corresponding Author(s):
FU Sihua,Email:fusihua2002cn@hotmail.com
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Issue Date: 05 September 2009
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