| 代树红*,文晓芳,肖雨轩,黄华森.基于非线性光流方程的高阶时域DIC算法[J].实验力学,2022,37(1):125~131 |
| 基于非线性光流方程的高阶时域DIC算法 |
| High-order time-domain DIC algorithm based on nonlinear optical flow equation |
| 投稿时间：2021-04-14 修订日期：2021-06-18 |
| DOI：10.7520/1001-4888-21-086 |
| 中文关键词: 数字图像相关方法 非线性光流方程 高阶时域算法 低质量图像 |
| 英文关键词:digital image correlation method nonlinear optical flow equation high order time domain algorithm low quality speckle image |
| 基金项目:国家自然科学基金重点项目(U1839211);辽宁省高等学校创新人才(LR2019031);辽宁省教育厅基础项目（LJ2019JL006）项目资助 |
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| 中文摘要: |
| 针对极端测试环境中采集的低质量测试图像,提出一种解析高精度变形场的高阶时域DIC(Digital Image Correlation)算法。采用模拟散斑方法建立了含高斯白噪声的亚像素级位移图像,通过最小二乘迭代法求解高阶时域DIC算法的位移量,分析了算法的测试精度。研究结果表明,非线性光流方程能够描述变形前后像素点灰度变化的时间连续性,解析变形的速度项和加速度项；高阶时域DIC算法对图像灰度变化不敏感、测量精度高,解决了从低质量散斑图像解析高精度变形量的难题。 |
| 英文摘要: |
| Aiming at the low quality test images captured in extreme testing environment, a high-order time-domain DIC algorithm is proposed to analyze the high precision deformation field. A sub-pixel displacement image containing Gaussian white noise is established by using the simulated speckle method. The displacement of the high-order time-domain DIC algorithm is solved by the least square iteration method, and the test accuracy of the algorithm is also analyzed. The results show that the nonlinear optical flow equation can describe the time continuity of the change of pixel gray level before and after deformation, and analyze the velocity term and acceleration term of deformation. The high-order time-domain DIC algorithm is insensitive to the change of image gray scale and has high measurement accuracy, which solves the problem of resolving high-precision deformation from low-quality speckle image. |
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