作　　者： ; ; ; ; ;

机构地区： 天津大学机械学院

出　　处： 《实验力学》 2004年第4期500-506,共7页

摘　　要： 本文提出了一种新的数字图像相关方法 (DICM)———将圆形窗口与矩特征相结合的算法。该方法克服了通常的数字图像相关方法不能在测试对象有 5°以上转角的情况下使用的缺点 ,在测试对象既有平动、又有较大转角的转动时仍然能进行高精度的搜索运算。文中详细阐述了该方法的原理与搜索过程 ,对搜索过程中矩与图像变形的关系及相关计算后相关峰的含义均作了详细讨论 ,并通过数值模拟和实验对由该方法所形成的数字图像处理软件的测量精度和在实际测量中的测试误差进行了分析和研究 ,从理论和实验两方面证明了该方法的可行性和优越性 。 A new digital image correlation method (DICM) combining circular window and moment (character) is proposed. The method overcomes the shortcoming of the general digital image correlation method which (can′t) work under the condition that the tested object has a rotation angle larger than five degree. The method can still perform calculation with high accuracy when the tested object has translation and rotation simultaneously. The principle and search process, including the relationship between moments and deformation of image and the meaning of correlation peaks after calculating, are presented in detail. The measurement accuracy of the DICM software and the measurement error in the real condition are also analyzed through numerical simulation and experiment. Thus, we draw a conclusion that this method is feasible and advanced not only in theory but also in application. Finally, the factors of affecting accuracy and efficiency of calculating are discussed.

关 键 词： 窗口 数字图像处理 图像变形 对象 搜索 测试 软件 矩特征 相关峰 拟和

领　　域： [理学] [理学] [自动化与计算机技术] [自动化与计算机技术]