光电成像探测中目标方位测量方法

摘要

In order to obtain the image and the position information of the target, an azimuth measuring method for moving targets based on monocular vision system is investigated. According to the principle of projection imaging, the mapping relationship between the 3-D position and the 2-D image of the target is derived, and the target azimuth measuring mathematical model is established based on monocular vision system. A detection combination algorithm is proposed using image subtraction and KLT method for moving targets under still background and changing background, and the sub-pixel orientation method is applied to the positioning of target feature points. The experimental and simulation results show that the method can extract the target feature points effectively, achieving a relatively accurate target positioning, and the target azimuth information is measured through monocular vision method, with the error within +8%.%为了在光电成像探测目标的同时给出目标相对探测器的方位信息,探讨了一种基于单目视觉的运动目标方位测量方法.根据投射成像原理,推算出二维目标像点坐标与目标的空间三维位置之间的映射关系,建立了单目视觉测量目标方位的数学模型.结合帧间差分法和KLT方法检测静止背景下和变化背景下的运动目标,并对目标特征点进行亚像素定位.试验和仿真结果分析表明,该方法能够有效提取目标的特征点,可对目标较为准确地定位,并通过单目视觉测量出目标方位信息,误差控制在±8％的范围内.