一种改进的亚像素位移测量算法研究与应用

摘要

提出改进的亚像素位移测量算法ISPMA( improved sub-pixel measurement algorithm). 首先利用混合蛙跳算法快速全局寻优能力生成亚像素位移测量初始值,然后采用线性灰度改变灰度梯度迭代算法对应变图像进行处理,提高应变测量精度. 在此基础上设计一种基于数字图像处理技术的非接触应变测量系统,分析系统总体结构和软件开发方案,设计基于ATmega162的伺服控制电路. 为了验证该系统应变测量性能,对试样进行变形测量实验,结果表明该系统能够精确有效地进行材料变形测量.%We propose an improved sub-pixel displacement measurement algorithm ( ISPMA) .First the ISPMA generates the initial value of sub-pixel displacement measurement using the fast global optimisation capability of shuffled frog leaping algorithm ( SFLA) , then it employs linear gray level changing grayscale gradient iteration algorithm to process the strain image to improve the strain measurement precision.On that basis we design a digital image processing technology-based non-contact strain measurement system, analyse the overall structure of the system and the software development scheme, and design the ATmega162-based servo control circuit.In order to verify the performance of strain measurement of the system, we carry out the deformation measurement experiment on samples.Results show that the system can accu-rately and effectively measure the deformation of materials.