基于径向基函数神经网络的栅格图像非线性畸变校正  

Nonlinear Distortion Correction of Grid Image Based on Radial Basis Function Neural Network

作　　者：郑毅[1,2,3] 郑苹[4] 

机构地区：[1]南京航空航天大学民航/飞行学院,南京210016 [2]西安电子科技大学技术物理学院,西安710071 [3]山东工商学院信息与电子工程学院,烟台264005 [4]华中科技大学图像识别与人工智能研究所,武汉430074

出　　处：《科学技术与工程》2013年第25期7573-7576,共4页Science Technology and Engineering

基　　金：国家自然科学基金项目(60970105;61173173);山东省自然科学基金项目(ZR2012FL09);山东省住房和城乡建设厅科技项目(2011YK060);山东省高等学校科研计划(J11LG12)联合资助

摘　　要：为了减小光电成像测量系统中存在的非线性畸变,提高测量精度,提出了一种基于径向基函数神经网络的图像畸变校正方法。提取带有桶形畸变的栅格图像中的栅格交叉点作为控制点,利用光学成像关系推算出栅格交叉点的理想无畸变位置,构成径向基函数神经网络的训练集。经过训练,可以确定径向基函数神经网络结构的优化参数。针对栅格图像进行了畸变校正实验,并与多项式变形法进行了比较。实验结果表明,所提方法能够自动、有效地校正图像畸变,效果优于多项式变形法。In order to decrease nonlinear distortion of electro-optical imaging measurement system, a distortion correction method based on radial basis function neural network is proposed to improve measure precision. Cross points of the black lines can be found and regarded as control dots by edge detection and thinning of a grid image with barrel distortion. According to imaging characteristic of an optical system, coordinates of cross points in an un- distorted image can be calculated from ones in the distorted grid image. With control dot pairs, a training set of ra- dial basis function neural network can be set up. Optimal structural parameters of the radial basis function neural network can be obtained by training. The proposed method is tested and compared with a polynomial warping meth- od. Experimental results show that the proposed method can correct distortion automatically and efficiently, and has a better distortion correction than the polynomial warping method.

关 键 词：图像处理 畸变校正 径向基函数神经网络 训练集 多项式变形 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]