一种测地线活动轮廓模型的预处理方法  

A pre-process method of geodesic active contour

作　　者：张博[1] 苏永利[1] 张书玲[1] 

机构地区：[1]西北大学数学系,陕西西安710069

出　　处：《兰州大学学报（自然科学版）》2008年第5期81-85,共5页Journal of Lanzhou University(Natural Sciences)

基　　金：陕西省教育厅专项基金(JK05303)资助.

摘　　要：为解决测地线活动轮廓模型在图像分割中的平滑预处理以及图像梯度的计算,并提高水平集方法实现该模型时构造符号距离函数的速度,通过对Gaussian函数以及差分运算的讨论,提出了一种基于Sobel算子图像预处理方法,并通过对8-邻域点性质的分析,给出了一种基于邻域扫描的符号距离函数计算方法.实验结果表明,Sobel算子可以同时实现图像的平滑处理并计算梯度,而且降低了差分计算梯度的时间复杂度,而邻域扫描方法相比其他符号距离函数的构造方法能够提高模型算法的执行效率.To smooth the image and calculate the gradient of an image in the process of using geodesic active contour（GAC） model in image segmentation, and to construct the signed distance function in level set method, a new pre-proeess method of GAC based on Sobel operatorwas presented through a discussion of the calculation process of Gaussian function and difference approximation. Then, by analysising the 8-neighbor of a point, the paper presented a method based on sorting neighbor to calculate the signed distance. The results of experimental showed that The Sobel operator could smooth the image and calculate the gradient simultaneously and the method could calculate the distance more quickly than other methods.

关 键 词：水平集 测地线活动轮廓 Gaussian函数 SOBEL算子 符号距离函数 

分 类 号：TP301[自动化与计算机技术—计算机系统结构]