Volume 5 Issue 6
Dec.  2012
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WANG Xi-jun. Computation and comparison of laser speckle with sub-pixel measurement methods[J]. Chinese Optics, 2012, 5(6): 652-657. doi: 10.3788/CO.20120506.0652
Citation: WANG Xi-jun. Computation and comparison of laser speckle with sub-pixel measurement methods[J]. Chinese Optics, 2012, 5(6): 652-657. doi: 10.3788/CO.20120506.0652

Computation and comparison of laser speckle with sub-pixel measurement methods

doi: 10.3788/CO.20120506.0652
  • Received Date: 21 Sep 2012
  • Rev Recd Date: 13 Nov 2012
  • Publish Date: 10 Dec 2012
  • On the characteristics of the interpolation, gradient-based and Newton-Rapshon algorithms used in the sub-pixel process in the laser speckle technology, the same laser speckle pattern was calculated one by one with the three sub-pixel algorithms under the drying process of the magnet fluid, and the mean bias errors and the standard deviation curves in a sub-pixel scale were worked out. The characteristics of the three algorithms to process the laser speckle pattern given by the mean bias error and standard deviation were discussed and the calculation accuracy, stability and calculation consumption were compared. It is shown that the precision and stability of the gradient-based algorithm is higher in the small deformation within the sub-pixel displacement measurement. The computing efficiency of the gradient-based algorithm is approximately nine times faster than that of Newton-Rapshon method. Therefore, it is more efficient to take advantage of the gradient-based algorithm to calculate the laser speckle in the small deformation and the sub-pixel displacement measurement.

     

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