牛永强,胡秋实,闫德莹,刘贵全,胡小方,许峰,缪泓*,张忠.基于数字图像体相关的物体内部三维位移场分析[J].实验力学,2011,26(3):247~253 |
基于数字图像体相关的物体内部三维位移场分析 |
Internal 3D Displacement Analysis using Digital Image Volumn Correlation Method |
投稿时间:2010-05-07 修订日期:2010-12-14 |
DOI: |
中文关键词: 数字图像相关 三维数字图像体相关 三维位移场 灰度梯度算法 |
英文关键词:digital image correlation 3D digital image volumn correlation 3D displacement gray-level gradient algorithm |
基金项目:国家自然科学基金项目(10772171, 10732080),国家重点基础研究发展计划资助项目(2007CB936803) |
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中文摘要: |
在二维数字图像相关算法的基础上,推导了三维数字图像体相关算法,并应用于物体内部的三维位移场分析。用计算机模拟方法对SR-CT重建的物体内部三维图像施加已知变形,对变形前后三维数字图像进行体相关运算,获得三维位移场。在计算亚像素位移时,本文提出了一种三维的基于灰度梯度的算法,给出了梯度函数,阐述了数字模拟三维体相关的计算过程,通过数字模拟实验证明了算法的正确性和可靠性。 |
英文摘要: |
3D digital image volumn correlation algorithm was improved based on traditional 2D DIC method, and applied to calculate the internal 3D displacement of an object. Original 3D image was a reconstructed image obtained from SR-CT experiment, and the deformed 3D images were computer simulated images subjected to known deformations. A special 3D sub-pixel algorithm based on gray-level gradient was proposed to determine the sub-pixel displacement, and the 3D gray-level gradient function was presented. The process of 3D DIVC is described in this paper, and the validity of the algorithm is verified. |
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