基于映射适应性卷积和等距投影的鱼眼图像畸变校正算法  

Research on the Algorithm of Fisheye Image Distortion Correction Based on Mapping Adaptive Convolution

作　　者：马辉 朱琳 曾静[1] MA Hui;ZHU Lin;ZENG Jing(College Computer Science,Sichuan University,Chengdu 610065)

机构地区：[1]四川大学计算机学院,成都610065

出　　处：《现代计算机》2021年第9期51-56,共6页Modern Computer

基　　金：国家重大项目(No.GJXM92579)。

摘　　要：鱼眼镜头是计算机视觉领域常见的一种光学镜头,具有焦距短和视角大的有点,通过该镜头获得的成像范围更大的鱼眼图像,并且因为鱼眼镜头的光学特性,鱼眼镜头的应用也越来越广泛。但是由于鱼眼镜头的畸变十分严重,在使用鱼眼图像前通常会对鱼眼图像进行畸变校正。现有的鱼眼图像畸变校正方法,通常是直接对鱼眼图像直接进行畸变校正,这种方式的缺点是会引入混叠现象。后混叠现象通常的解决方式是在重采样之前进行低通滤波,但是采用的滤波器的卷积核如果是标准卷积核的话,又会引入前混叠现象。本文提出一种新的畸变校正方法,通过采用映射适应性的卷积核即解决传统方法的混叠现象问题,又解决低通滤波导致的混叠问题。Fish-eye lens is a common optical lens in the field of computer vision.It has the advantages of short focal length and large viewing angle.The fish-eye image with a larger imaging range can be obtained through this lens.And because of the optical characteristics of fish-eye lens,the application is also more and more extensive.However,because the distortion of the fish-eye lens is very serious,the fish-eye im⁃age is usually corrected for distortion before the fish-eye image is used.The existing fish-eye image distortion correction method usually di⁃rectly performs distortion correction on the fish-eye image.The disadvantage of this method is that it will introduce a post-aliasing phenom⁃enon.The usual solution to post-aliasing is to perform low-pass filtering before resampling,but if the convolution kernel of the filter used is a standard convolution kernel,pre-aliasing will be introduced.This paper proposes a new distortion correction method,which solves the post-aliasing problem of the traditional method by adopting the adaptive convolution kernel of mapping,and also solves the post-aliasing problem caused by low-pass filtering.

关 键 词：鱼眼镜头 畸变校正 映射适应 混叠 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]