Robust digital imaging Spearman's Rho correlation for pepper and salt noise

HUANG Wang-hua; WANG Qin-ruo; XU Wei-chao; HU Zhong; ZHOU Yan-zhou

doi:10.3788/OPE.20152306.1800

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Robust digital imaging Spearman's Rho correlation for pepper and salt noise

更新时间：2020-08-13

- Robust digital imaging Spearman's Rho correlation for pepper and salt noise
- Optics and Precision Engineering Vol. 23, Issue 6, Pages: 1800-1806(2015)
- 作者机构：
  
  广东工业大学自动化学院,广东广州,510006
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20152306.1800
  CLC： TP391.4
- Received：25 December 2014，
  
  Revised：03 February 2015，
  
  Published：25 June 2015
- 稿件说明：
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黄旺华, 王钦若, 徐维超等. 对椒盐噪声稳健的数字图像斯皮尔曼秩次相关法[J]. 光学精密工程, 2015,23(6): 1800-1806

HUANG Wang-hua, WANG Qin-ruo, XU Wei-chao etc. Robust digital imaging Spearman's Rho correlation for pepper and salt noise[J]. Editorial Office of Optics and Precision Engineering, 2015,23(6): 1800-1806
黄旺华, 王钦若, 徐维超等. 对椒盐噪声稳健的数字图像斯皮尔曼秩次相关法[J]. 光学精密工程, 2015,23(6): 1800-1806 DOI： 10.3788/OPE.20152306.1800.

HUANG Wang-hua, WANG Qin-ruo, XU Wei-chao etc. Robust digital imaging Spearman's Rho correlation for pepper and salt noise[J]. Editorial Office of Optics and Precision Engineering, 2015,23(6): 1800-1806 DOI： 10.3788/OPE.20152306.1800.

摘要

应用传统数字图像相关方法进行变形场分布测量时

很难精确处理带有椒盐噪声的数字图像.本文利用斯皮尔曼秩次(SR)相关系数对于椒盐噪声鲁棒的特点

提出了一种基于SR的数字图像相关算法.根据SR均值统计特征

当椒盐噪声密度足够小时

二元高斯混合模型数据的SR相关系数主要由散斑图像母体之间的相关系数决定.为了验证SR在椒盐脉冲噪声情况下的稳健性

采用可精确控制的模拟散斑图像进行了仿真

然后在三维扫描系统中使用SR相关技术计算出扫描数据的偏差.可控压缩散斑变形仿真表明

当椒盐噪声密度小于25%

计算子块大小为41 pixel41 pixel时

SR数字图像相关仍可计算出精确的变形.将该算法应用于计算激光扫描纹理数据之间的偏差

结果显示

整体变形为4 m时

Abstract

When traditional digital image correlation technique is used to measure the deformation displacement

the digital image with very small amount of pepper and salt noise is difficult to be processed precisely. Therefore

this paper proposes a new digital image correlation method based on Spearman's rho(SR) correlation coefficient robust to pepper and salt noise. According to the SR's average statistic characteristics

the SR coefficient of bivariate Gaussian mixture model is mainly decided by the clean speckle image when the density of pepper and salt noise is small enough. To verify the robustness of the SR to pepper and salt noise

the controllable simulation speckle image is used in a simulation

and the SR correlation technology is used to calculate the scanning errors. The results indicate that it can still get the accurate displacement vector by the SR digital image correlation when the density of pepper and salt noise is less than 25% and the block size is 41 pixel41 pixel. The algorithm is used to calculate the laser-scanning texture data

and the sampling offset calculated is 4 m with the correlation coefficient of 0.996 6. The result shows that the SR digital image correlation technique has strong robustness

and is suitable for calculating the deformation displacement vector under the pepper and salt noise.

关键词

Keywords

references

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