Acta Optica Sinica, Volume. 37, Issue 3, 303001(2017)
Initial Displacement Estimation Method for Speckle Image Based on Marker Matching
For digital speckle correlation methods, the reliable initial displacement estimation is particularly important to achieve sub-pixel accuracy. Utilizing marker matching technology, a new initial value estimation method is proposed. This method sticks circular markers with high reflection coefficient on the speckles. In order to eliminate the effects of speckles on extracting points, an improved scale invariant feature transform algorithm detecting extreme points within significant edge region is presented, so the redundant feature points are greatly reduced in this way. At last, the homography transformation is executed to complete full field deformation, and the initial value of each pixel in the region of interest is estimated rapidly. Experiments are performed through making speckle plate and the results show that the initial values obtained by the proposed method can reach a fast convergence within 3-4 iterations and consequently get accurate and reliable measurement results.
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Zhang Hongying, Yu Zhijing. Initial Displacement Estimation Method for Speckle Image Based on Marker Matching[J]. Acta Optica Sinica, 2017, 37(3): 303001
Category: Coherence and statistical optics
Received: Sep. 29, 2016
Accepted: --
Published Online: Mar. 8, 2017
The Author Email: Hongying Zhang (carole_zhang0716@163.com)