数字图像相关中亚像素位移测量的曲面拟合法  

Sub-pixel Registration Using Quadratic Surface Fitting in Digital Image Correlation

作　　者：潘兵[1] 续伯钦[1] 陈丁[1] 冯娟[1] 

机构地区：[1]中国科学技术大学中科院材料力学行为与设计重点实验室,安徽合肥230027

出　　处：《计量学报》2005年第2期128-134,共7页Acta Metrologica Sinica

基　　金：国家自然科学基金(10232010)

摘　　要：曲面拟合法求解亚像素位移是数字图像相关亚像素位移定位中的一种重要方法,它具有抗噪声能力较强、精度高、计算效率高等优点,在实际应用中多被采用。就该算法中影响亚像素位移定位精度的各要素进行了详细讨论,并用计算机生成的模拟散斑图和金属试件的刚体平移实验进行了验证,结果表明,整像素搜索时选取不同的计算窗口对计算结果的影响最大,而文中所列的几种相关函数的选取对计算结果的影响则可以忽略。Sub-pixel registration using quadratic surface fitting as one of the digital image correlation methods has been widely used in measuring sub-pixel displacement in experimental solid mechanics, for its high efficiency and noise-free performance. All factors affecting calculation are discussed. The computer-simulated speckle images and rigid body translation experiment of metal specimen are used to verify the accuracy. An optimal subset size between 41×41-61×61 (pixels) is verified while impacts of different correlation functions on the calculated displacement can be ignored. In addition, it is also found that a 3×3(pixels) fitting window of correlation coefficient matrix gets the highest precision with least computation.

关 键 词：计量学 数字图像相关 曲面拟合 亚像素 

分 类 号：TB93[一般工业技术—计量学]