双目立体实时测距系统的关键技术研究

基于双目视差测距原理,建立了一个被动测距实验系统。围绕提高测距系统的测距精度、准确率、速度和抗干扰性能等,研究了图像预处理、配准算法、搜索策略等关键技术。提出了改进的互积相关配准测度,并采用粗、精配准相结合的搜索策略以及抛物线拟合方法,实现了快速双目立体目标测距。实验证明该测距算法可有效地抑止噪声、双目光强和图像对比度差异等因素的影响;测距系统测距精度高、稳定性好、实时性好,对于10km目标相对测距误差小于4% ,响应时间小于0. 5 s。

Research of Key-tech in a Binocular Real-time Ranging System

A binocular passive ranging system is developed. The key techniques of binocular ranging are analysed in detail. An improved algorithm of matching is proposed. By incorporating sketchy matching with accurate matching,and using parabola fitting, the matching position can be obtained quickly and accurately in the orde r of sub-pixel . The experiments on the ranging systems stability, repeatability and precision have done. The results show that the ranging relative2error is below 4% for a target at 10 km and the response time is less than 0. 5 s. The advantages of high accuracy, real2time make itwill be attractive in mobile target positioning.