接触线参数双目视觉测量系统的有效视场与分辨率分析

根据双目测量系统的特点和接触线参数检测的技术要求,分析了双目视觉法测量接触线的有效视场和分辨率与系统结构参数和摄像机光学参数的理论关系.应用MATLAB软件对不同结构参数和光学参数条件下的有效视场和分辨率进行仿真计算.结果表明图像传感器CCD的光敏面尺寸和像素尺寸分别是影响有效视场和分辨率的主要因素；对于确定的CCD,焦距增大,有效视场减小,分辨率提高；而且,对接触线高度的测量分辨率远低于对拉出值的测量分辨率.

Analysis of the effective field of view & resolution on the binocular measuring system of contact wire's parameters

According to the characteristics of binocular measuring system and the technical requirements of contact wire,this paper presents an analysis on theoretical relationship between the effective field of view & resolution of a binocular measuring system and the system’s structure parameters and camera optical parameters.The simulating calculation for the effective field of view and resolution on different structure parameters and optical parameters are done by use of MATLAB simulating software.The results show that the image area size and pixel size of a CCD are principal influence factors on effective field of view and resolution;once CCD has been chosen,increase in focus will make the effective field of view decrease and resolution increase.Moreover,the measuring resolution for contact wire’s height is below the one for contact wire’s stagger.These conclusions have instructional significance for the optimal design of a practical measurement system.