## 留言板

 引用本文: 王希军. 激光散斑的亚像素位移法计算及比较[J]. 中国光学（中英文）, 2012, 5(6): 652-657.
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.

## 激光散斑的亚像素位移法计算及比较

##### doi: 10.3788/CO.20120506.0652

###### 通讯作者: 王希军
• 中图分类号: TP391.4; O436.1

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

• 摘要: 根据激光散斑相关测量中采用的插值法、梯度算法和牛顿-拉夫森迭代法3种亚像素位移算法的特点,逐一在亚像素尺度计算出磁流体干燥过程中的同一激光散斑图的偏均值和标准差变化曲线。基于得到的偏差均值和标准差讨论了3种算法处理激光散斑图的特点,比较了3种算法处理散斑图的计算精度、稳定性和计算用时。结果显示,在小变形的亚像素位移测量时,梯度算法的精度较高,且较为稳定,计算效率也较牛顿-拉夫森算法快约9倍。因此,在进行小变形亚像素位移测量时,采用梯度算法计算激光散斑是有效的。

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##### 出版历程
• 收稿日期:  2012-09-21
• 修回日期:  2012-11-13
• 刊出日期:  2012-12-10

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