Phase scanning centering based on polar coordinate transformation
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1.
School of Mechanical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
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Corresponding author:
ZHAO Bin, zhaobin63@sohu.com
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Received Date:
2013-09-04
Accepted Date:
2013-10-10
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Abstract
In order to realize fast and precise centering with non-diffracting spot as straight-line datum under complex background noise, the fluctuation of phase angle of non-diffraction spot with polar angle under polar coordinates was obtained with the phase scanning method. The deviation was the difference between the phase of non-diffraction spots on the ring direction and the phase of standard sinusoidal stripes. Finally, the centering of the non-diffraction spot can be realized after a number of iterations. Theoretical analysis and experimental verification show the method has the good ability of anti-noise, less time consumption and sub-pixel level accuracy.
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