基于边缘信息改进双线性插值算法.pdf

Computer Engineering and Applications 计算机工程与应用 2011 ，47 （31） 171 基于边缘信息改进的双线性插值算法 1 2 3 郭海霞 ，郭海龙 ，解 凯 1 2 3 GUO Haixia ，GUO Hailong ，XIE Kai 1.哈尔滨金融高等专科学校 计算机系，哈尔滨 150030 2.哈尔滨学院，哈尔滨 150080 3.北京印刷学院 信息与机电学院，北京 102600 1.Department of Computer ，Harbin Finance College ，Harbin 150030，China 2.Harbin University ，Harbin 150080，China 3.College of Information Mechanical Engineering ，Beijing Institute of Graphic Communication ，Beijing 102600，China GUO Haixia ，GUO Hailong ，XIE Kai.Improved bilinear interpolation algorithm based on edge information.Computer Engineering and Applications ，2011 ，47 （31 ）：171-174. Abstract ：Because edge information is not considered ，some fringe details of image are damaged in the process of standard bilinear interpolation.To avoid the disadvantages of standard bilinear interpolation ，a new algorithm based on edge information is proposed.In this method ，three improved solutions have been proposed ：edge-pixel and non edge-pixel are distinguished by edge-detection and adaptive-threshold ，grey-difference between edge-adjoined-pixel and non edge-adjoined-pixel is extended.Us- ing direction of edges ，interpolated points are determined on edge or not.To the point on edge of magnified image ，it is inter- polated based on edge information.Many experiments confirm that this algorithm is superior to others. Key words ：bilinear interpolation ；image processing ；edge-detection 摘 要：针对传统双线性插值算法插值时未考虑图像边缘信息，致使放大后图像出现模糊效应的特点，提出基于边缘信息的插值 算法。该算法利用边缘检测及自适应门限划分出原始图像中的“边缘点”及“非边缘点”，引入“灰度补偿”参数增加了边缘邻接插 值点与非边缘邻接插值点间的灰度差，利用边缘点的“边缘方向”特性，判定待插值点是否位于放大图像的边缘上，对位于边缘上 的待插值点利用边缘信息插值，恢复了使用传统双线性插值时断裂的边缘。大量的仿真实验证明该算法在一定程度上抑制了放 大后图像边缘模糊的效应，改善了放大图像的视觉效果。 关键词：双线性插值；图像处理；边缘检测 DOI ：10.3778/j.issn. 1002-8331.2011.31.049 文章编号：1002-8331（2011 ）31-0171-04 文献标识码：A 中图分类号：TP391 1 引言