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基于阶梯细化的图像放大算法

发表时间:2008-05-31  浏览量:2137  下载量:835
全部作者: 侯国强
作者单位: 兰州大学信息科学与工程学院
摘 要: 本文针对图像放大时边缘出现的锯齿失真现象,分析了锯齿出现的原因,提出数字图像中的边缘是由一系列不连续的阶梯构成的,并认为边缘的这种非连续性在图像放大过程中也被放大,从而产生锯齿失真。根据上述分析,提出基于阶梯细化的图像放大算法。该算法在图像的非边缘区域采用经典的双线性插值算法;同时根据Canny边缘检测的结果,进一步进行阶梯检测,滤除不会产生锯齿失真的竖直和水平边缘;而在使用经典算法会产生严重锯齿失真的边缘区域,运用基于阶梯细化的插值算法;该插值算法在放大图像的同时,抑制边缘中的阶梯被放大,从而达到减少锯齿失真的目的。最后的实验结果和对比表明,该算法可以较好地抑制锯齿失真。
关 键 词: 图像处理;图像放大;阶梯细化;插值;锯齿效应
Title: Image zooming algorithm based on stair thinning
Author: HOU Guoqiang
Organization: College of Information Science and Engineering, Lanzhou University
Abstract: Image zooming involves the well-known zigzagging artifacts in digital image edge areas. The edges of digital image are non-continuity and can be seen as containing many stairs. The reason for zigzagging artifacts is that the non-continuity is also enlarged in image zooming. According to above analysis, a hybrid algorithm for image zooming based on stair thinning is proposed to decrease the artifacts. This algorithm adopts bilinear interpolation in smooth area. And Canny egde detection algorithm is implemented. In the detected edge area, stairs are detected and horizontal and vertical edges are removed, since they produce no zigzagging artifacts. In order to decrease zigzagging artifacts, in the edge areas containing many stairs, stair thinning interpolation algorithm is implemented to keep stairs from being enlarged. The experiment results show that this interpolation algorithm can significantly remove zigzagging artifacts in image zooming.
Key words: image processing; image zooming; stair thinning; interpolation; zigzagging
发表期数: 2008年9月第10期
引用格式: 侯国强. 基于阶梯细化的图像放大算法[J]. 中国科技论文在线精品论文,2008,1(10):1141-1146.
 
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