MTF对立体测绘高程精度影响研究

Research on Influence of MTF on Elevation Precision in Stereoscopic Surveying

MTF(调制传递函数)是反映测绘相机性能的重要指标,研究MTF对测绘高程精度的影响可以对相机的设计指标提出要求,对提高测绘精度具有极其重要的意义。文章通过计算机仿真的方法进行研究,利用3D Studio Max软件构建三维模型与模拟成像、用Harris算子提取图像特征点,并用奇异值分解与最小二乘法进行特征点的匹配,通过前方交会的知识计算得出高程值。文中采用刃边法与脉冲法对图像MTF值进行定量获取与相互验证,建立了MTF与高程精度之间的关系。

The Modulation Transfer Function（MTF） is an essential parameter which reflects the function of surveying camera. The research on the influences of MTF on elevation precision has important meaning which can put forward the requirement of surveying camera and improve the elevation precision. A computer simulation experiment is implemented in this paper, including 3D modeling and imaging by 3D Studio Max, and image feature points are extracted by Harris operator and matching via singular value decomposition and the least square method, as well as the forward intersection to get the elevation value. Edge and pulse methods are used to measure the MTF of images, and the two methods can also verify each other, then the relationship between MTF and elevation precision can be built.