摘要
图像的边缘检测是图像特征提取和图像分析理解的基础.运用Roberts,Sobel,Prewitt,Laplacian 4种经典边缘检测算子对TM遥感影像进行水体边缘检测研究,然后对各种算子获得的结果进行比较.结果认为:采用Roberts算子获得的水体边缘不清晰,而且边缘不连续,边缘检测效果比较差;采用Sobel算子获得的水体边缘局部效果不佳,边缘定位精度不高;采用Laplacian算子获得的水体边缘不具有方向性,定位精度高,检测出了绝大部分的边缘;采用Prewitt算子方法二获得的水体边缘明显,效果最佳.因此,Prewitt算子方法二是最佳的基于TM遥感影像提取水体边缘的方法.
The image edge detection is a basis for the extraction,analysis and understanding of image features.The typical edge detection algorithms such as Roberts,Sobel,Prewitt,Laplacian are used to study water body edge detection based on TM images,and results obtained from various algorithms are compared.As a result,it concerns that the edge of water body extracted by Roberts algorithm isn＇t clear and discontinuous,and the effect of edge detection is unsatified;partial effect of the edge of the water body extracted by Sobel is poor and the accuracy of edge positioning is not high;while that of Laplacian algorithm has good positioning precision.Therefore,Prewitt algorithm No.2 is the best effect with obvious edge of water body.
出处
《林业调查规划》
2010年第4期15-18,共4页
Forest Inventory and Planning
基金
基于"3S"技术的滇西北天然林动态监测与景观生态评价(西南林业大学重点项目:200503Z)
西南林业大学森林经理学国家林业局重点学科(XKZ200901)
关键词
边缘检测
算子
TM卫星图像
edge detection
algorithm
TM satellite image
