以风洞试验中的气动弹性模型表面的标记点为载体，运用数字图像相关法（DIC）对CCD摄像机高频采集的灰度图像进行处理，得到标记点在时间序列下的位移值，从而得到待测结构的振动响应。通过介绍数字图像相关法的基本原理及其在风洞试验中的应用，并将其与激光位移计进行对比试验，验证了该方法的可靠性、稳定性和优越性。

Based on mark points on the surface of bridge pneumatic model adopting the digital image correlation (DIC) method to handle the pictures captured by CCD video camera in the high frequency, the displacement values of the mark points in the time series are gotten and thus the vibration responses of the bridge are obtained. The fundamental principles of the DIC method and its application are introduced. The reliability, stability and advantages of the method are testified by the comparison of the results with those measured by the laser displacement sensor.