基于Hough变换倾斜文档校正的改进方法  

Improved correction method of tilt documentation based on the Hough transform

作　　者：高宇鹏[1] 李益明[1] 胡众义[1] 刘寿亮[1] 杨凯[1] 

机构地区：[1]温州大学物理与电子信息工程学院,浙江温州325035

出　　处：《浙江工业大学学报》2013年第1期106-109,共4页Journal of Zhejiang University of Technology

基　　金：浙江省教育厅基金资助项目(Y201010070);浙江省新苗人才计划项目(2011R424038)

摘　　要：Hough变换虽被广泛用于倾斜文档校正,但其采用投票选举方式,计算量较大,校正效率较低.笔者对其效率进行探讨,对分辨率较高的图像采用多次降分辨率分步进行校正,从而实现高分辨率倾斜文本图像的快速校正.同时,考虑到普通文档边界有较强方向性的特点,直接对文档边界进行直线检测,计算倾斜角度,而不采用传统基于文本行的直线检测方法,从而缩短倾斜角检测时间.实验结果表明:该方法显著提高了校正效率、缩短了校正时间、提高了校正精度.Hough transform has been widely used in tilt documentation correction. But, the voting mechanism is used in this method, the amount of calculation is large and error correction efficiency is not high. This paper studies on this problem and gives the solutions. For the high- resolution image, resolution will be reduced several times and the images are corrected step by step in order to implement the rapid correction of the tilt text image. At the same time, considering the characteristics of the common documentation boundary with strong directionality, the line detection method is used on the documentation boundary to calculate the tilt angle in stead of the traditional line detection method based on textline. It will shorten the detection time. The experimental results show that the algorithm significantly improves the correction efficiency, shorten the correction time, and improved the correction accuracy.

关 键 词：HOUGH变换 图像校正 变分辨率图像 倾斜校正 降分辨率 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]