采用广角数码相机测量图像显示系统的几何畸变

Measuring Geometrical Distortion of Image Display System with Wide-Angle Digital Camera

准确地测量含有广角耦合物镜的图像显示系统的几何畸变是实现图像显示系统几何畸变数字校正的前提和关键。提出了一种以非量测广角数码相机为测量设备的几何畸变的测量方法,首先给出了广角数码相机镜头畸变的标定方法,确定了数码相机镜头畸变系数,然后讨论了基于广角数码相机和Photoshop软件进行图像显示系统几何畸变测量的测量方法,分析了影响测量精度的因素。最后,将本文的测量结果与基于点物成像原理,采用单轴转台和普通数码相机进行测量的测量结果进行了对比,二者吻合得较好。从测量结果看,本文给出的测量方法,其测量精度可以满足工程要求,简单、易行。

Accurate measurement of geometrical distortion of image display system with wide-angle objective lens is the precondition and key of digital distortion correction. A distortion measuring method using non-metric wide-angle digital camera is proposed. A distortion calibration method of wide-angle digital camera lens is presented, and the distortion coefficients are ascertained firstly. The measuring method of geometrical distortion based on wide-angle digital camera and photoshop software is discussed. Factors which affect measuring accuracy are analyzed. The results of this paper are in good agreement with the results of the method based on point object imaging theory and using digital camera and single-axis turntable. Results show that the precision of measuring method in this paper can meet engineering needs. Moreover, our method is more simple than the method based on point object imaging theory.