镜头成像畸变的MTF像高测试法研究

为了解决传统标板拍摄测试广角镜头成像畸变的不准确、复现性差问题,提出了基于调制传递函数(MTF)理论的成像畸变测试方法。通过研究镜头畸变测试国内外的研究现状,重点分析了成像镜头特别是广角镜头采用传统标板拍摄测试成像畸变的缺陷。提出了一种通过测试镜头轴上有效焦距和不同角度的离轴有效焦距,并导入畸变计算公式从而得到镜头成像相对畸变的MTF测试方法。研究结果表明,采用MTF测试方法可以实现对镜头成像畸变的快速、准确的测量。

Research on MTF based on image height measurement technology for measuring distortion of camera lens

In order to solve the problems of inaccurate distortion and poor reproducibility of wide-angle lens imaging in traditional target shooting test, this paper proposes an imaging distortion test based on the MTF theory, and elaborates the advantages of using the method based on the MTF imaging distortion test. The test facilitates integration automation and reduces the uncertainty caused by human factors. By studying the researches of lens distortion testing at home and abroad, the defects of imaging distortion, especially the wide-angle lens using traditional target plate shooting, are analyzed. The MTF test method is to calculate the relative distortion of the lens imaging by testing the EFL on the lens axis and the off-axis EFL at different angles, and introducing distortion calculation formulas. The test results show that the method based on MTF test can be used to achieve rapid and accurate measurement of lens imaging distortion.