求解滑坡位移场的数字图像相关方法

Digital image correlation method for solving displacement field of landslide

精确求解滑坡位移场对于滑坡灾害的监控与防治有着十分重要的意义,将数字图像相关方法应用于滑坡位移场计算,可以快速准确得到滑坡在一段时间的位移场信息.本文以梅坪滑坡位移场求解为例,详细介绍了利用数字图像相关方法求解滑坡位移场的具体过程.对不同时间采集得到的梅坪滑坡图像,首先进行灰度化处理,以消除色彩、光照等因素造成的干扰;其次利用所选的标志点对两幅图像进行平移、旋转等校正,消除因人为拍照所引起的误差;最后对两幅图进行匹配求解得到对应时间的滑坡位移场.采用实验室标定方法对数字图像相关方法在小形变范围内的准确性进行了验证,为数字图像相关方法在滑坡位移场计算的应用上提供支持.

It is important to solve the landslide displacement field for the monitoring and prevention of landslide hazards.Applying the digital image correlation method to the calculation of the landslide displacement field,the displacement field information of the landslide can be obtained quickly and precisely.Taking the solution of the displacement field of Meiping landslide as an example,this paper introduces in detail the specific process of solving the landslide displacement field by using the digital image correlation method.We collected the images of landslides in Meiping area at different times,and firstly gray-process to eliminate interference caused by factors such as color and light.Secondly,we used some feature points in the two images to do corrections like translation and rotation to eliminate errors caused by filming;.Finally,we matched the two pictures to obtain the corresponding landslide displacement field.The accuracy of digital image correlation method in small deformation range was verified by laboratory calibration method,which provided support for the application of digital image correlation method in landslide displacement field calculation.