Zhi-Peng Xue, Chao Wang, Ming Li, Chunxue Wang, Hongguang Jia, Yue Yu
Appl Opt. 2021 Feb 1;60(4):1003-1012. doi: 10.1364/AO.413355.
Measurements of angular vibration of aerial cameras in a variety of operating conditions are critical to analyze the performance of the vibration isolation system. Instead of using an additional optical system to measure the angular motion of the camera, an image-based and easy-to-implement method is proposed for the linear array camera to measure the image motions captured by the camera directly. The natural frequencies of the vibration isolation were also measured by laboratory vibration test. For image vibration measuring, the angular vibration is represented in image motion by the relationship between the image motion and angular motion of the camera. Based on the pushbroom imaging principle, the image motion at the edge of the foreground image of the linear object is extracted using image processing technology including image segment and edge detection methods. Then the image motion is analyzed in the time and frequency domains. The proposed method has been successfully demonstrated for the angular vibration measurement by a flight test. The results of the vibration sensors and the position and orientation system of the flight tests are also given to validate the effectiveness and accuracy of the proposed approach.
在各种运行条件下测量航空相机的角振动对于分析隔振系统的性能至关重要。本文提出了一种基于图像且易于实现的方法，用于线性阵列相机直接测量相机捕获的图像运动，而不是使用额外的光学系统来测量相机的角运动。还通过实验室振动测试测量了隔振的固有频率。对于图像振动测量，角振动通过相机的图像运动与角运动之间的关系在图像运动中表示。基于推扫成像原理，利用包括图像分割和边缘检测方法在内的图像处理技术，提取线性物体前景图像边缘处的图像运动。然后在时域和频域中分析图像运动。通过飞行测试成功验证了该方法对角振动测量的有效性。还给出了飞行测试中振动传感器以及位置和定向系统的结果，以验证所提方法的有效性和准确性。
