摘要
由于数字相机光学镜头加工和装配误差的存在,使得相机图像平面上所成的像存在不同程度的非线性光学畸变,这样势必会影响图像检测、拼接和定量分析等的准确性。因此在进行精确检测、定量分析之前,需要对这类图像进行畸变改正。本文依据投影几何中空间直线经中心投影变换后仍是直线的原理,对数字相机的径向畸变进行检测,利用检测结果对畸变图像进行逐点改正,最后使用平滑模板来消去改正过程中产生的噪声点。实验表明,采用直线约束方法求解畸变系数是可行的,利用直接改正方法可以使畸变图像得到较好的改正。
As the existence of processing and assembly error of digital camera＇s optical lenses,it makes the image which is imaging on the camera image plane has varying degrees of nonlinear optical distortion which affects the accuracy of image detection, image mosaicking and quantitative analysis. Therefore, previous to conducting accurate detection and quantitative analysis,correcting this image should be done. This paper,according to the theory of projection geometry that a straight-line through center projection transformation is still a straight-line, dose an experiment which calibrates the radial distortion of digital camera,makes use of the detection result to correct the pixels of distorted image,uses smoothing template to expunge noise which generates from the correction process.The experiment indicates that the method which uses the straight-line restriction to solve the optical distortion error is feasible,direct correction can makes the distorted image obtain a good correction.
出处
《科技广场》
2008年第10期118-120,共3页
Science Mosaic
关键词
径向畸变差
直线约束
图像改正
直接改正
Radial Distortion
Straight-line Restriction
Image Correction
Direct Correction
