基于成像拖尾效应的图像测速算法

Velocity Measurement Algorithm Based on Smearing Effect

根据相机成像拖影长度与相机运动及曝光时间的关系,提出一种基于成像拖尾效应的图像测速方法,给出了用航拍相机进行图像测速的实施方案。建立了影像与成像平面和地面景物间的相对运动模型,设计了基于互相关分析的拖影长度测量方案,给出了测量算法,并分析了像素尺寸和成像比例等对测速精度的影响。算例表明:该法对速度无剧烈变化的准匀速运动的测速效果较好,为飞行器实时飞行速度测量提供了一种解决方案。

According to the relationship between the smear ghost and the relative movement of the camera and the target, an image method of velocity measurement based on the smearing effect was presented in this paper. The scheme of velocity measurement using aerial imaging camera was presented. The relative motion model of the image to the imaging plane and ground target was established. The measurement based on cross-correlation analysis for smear length was designed, and the measurement algorithm was given out. The effects of the pixel size and scale of the camera on the measurement accuracy were analyzed. The results showed that the new algorithm had a good performance in measuring velocity of the aircraft flying in a uniform speed, which was provided a solution for the aircraft velocity measuring in real time.