Optimization of correlation algorithms for small array pixels tracking sensors

YANG Qi-long; MA Xiao-yu; WEI Kai

doi:10.3788/OPE.20172513.0032

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Optimization of correlation algorithms for small array pixels tracking sensors

更新时间：2020-08-13

- Optimization of correlation algorithms for small array pixels tracking sensors
- Optics and Precision Engineering Vol. 25, Issue 10s, Pages: 32-38(2017)
- 作者机构：
  
  中国科学院光电技术研究所,四川成都,610209
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20172513.0032
  CLC： P427.1;TP301.6
- Received：11 June 2017，
  
  Revised：10 July 2017，
  
  Published：25 November 2017
- 稿件说明：
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杨奇龙, 马晓燠, 魏凯. 应用于小阵元跟踪传感器的相关算法优化[J]. 光学精密工程, 2017,25(10s): 32-38

YANG Qi-long, MA Xiao-yu, WEI Kai. Optimization of correlation algorithms for small array pixels tracking sensors[J]. Editorial Office of Optics and Precision Engineering, 2017,25(10s): 32-38
杨奇龙, 马晓燠, 魏凯. 应用于小阵元跟踪传感器的相关算法优化[J]. 光学精密工程, 2017,25(10s): 32-38 DOI： 10.3788/OPE.20172513.0032.

YANG Qi-long, MA Xiao-yu, WEI Kai. Optimization of correlation algorithms for small array pixels tracking sensors[J]. Editorial Office of Optics and Precision Engineering, 2017,25(10s): 32-38 DOI： 10.3788/OPE.20172513.0032.

摘要

为提高复合轴跟踪系统中不规则目标的跟踪精度，将相关算法引入阵列型光子计数器数据处理得到斜率偏差。与相关算法在传统CCD上应用一样，在阵列型光子计数器上取一帧的一部分作为模板。模版经对称优化后，将模板在被测帧上滑动匹配，经SAD算法后，通过拟合得出模板在被测帧上的位置测得光斑的偏移量。最后通过模板的光斑的质心位置对偏移进行校正实现稳定的跟踪。实验结果表明：修正后的相关算法可实现稳定跟踪，模版对称优化对拟合精度也有一定提升作用。优化后模版进行SAD算法的测量系统误差为0.018 pixel，测量随机误差为0.046 pixel。将相关算法引入小阵列探测器上，通过选取适当的模版大小并经过修正可实现稳定跟踪。

Abstract

In order to improve the tracking accuracy of irregular targets in compound axis tracking system

the correlation algorithm was introduced into array photon counters to process the slope error. Similar to the correlation algorithms used in conventional CCD

part of a frame of a array photon counter was used as a template. After the template was symmetrically optimized

the template was matched on the frame.With the SAD algorithm

the position of the template on the measured frame was obtained by fitting

and the offset of light spot was calculated. Furthermore

the offset was corrected by the centroid location of light spots on the template to achieve stable tracking. The experimental results show that the modified correlation algorithm can achieve stable tracking

and the symmetrical optimization of the template can also improve the fitting accuracy.With optimized template

the measurement error of the SAD algorithm is 0.018 pixel

and the random error is 0.046 pixel. Employing the correlation algorithm to small array detectors

the stable tracking can be achieved by choosing appropriate size of the template and correcting the template.

关键词

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references

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