Phase Fitting Method for Sub-pixel Displacement Measurements Using Digital Speckle Images

摘要：

This paper presents a technique to measure the minute displacement using digital speckle images.We firstly de-noise the speckle images using wavelet transform.And then the phase correlation algorithm is employed to calculate the integer pixel displacement.To get the sub-pixel accuracy,we make use of the pixels around the highest phase impulse to construct a continuous surface.The final displacement is obtained by computing the regional extreme point of the surface function.In this way,we boost up the phase correlation and get the sub-pixel information without the time-consuming template matching as used in DSCM (Digital Speckle Correlation Method).We demonstrated the feasibility and effectiveness of our method on practical measuring results.

作者: Mai Zheng Jian Ji Li Guo Junzhu Zhu

作者单位: Department of Electronic Science and Technology,University of Science and Technology of China

会议类型: 国际会议

会议名称: 9th International Conference on Signal Processing(第九届国际信号处理学术会议)(ICSP08)

会议地点: 北京

会议语种:英文

在线出版日期: 2008-10-26（万方平台首次上网日期，不代表论文的发表时间）