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应用Snake模型提取彩色图象目标轮廓线的研究

DOI: 10.11834/jig.2003011466

Keywords: Snake模型,色彩聚类边缘追踪,欧氏距离,加权HSI颜色空间,彩色图象,轮廓线

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Abstract:

为了更好地利用Snake模型来提取彩色图象中的物体轮廓,因而对Snake原型提出两点主要改进,即针对snake模型的手工初值设置问题,通过引入彩色聚类预处理过程来减少对人的依赖,首先,采用色彩聚类算法对原始图象进行分割,然后用改进的边缘追踪算法提取有意义区域的边缘,并用这一结果作为Snake模型的初值;然后针对Snake原型应用于彩色图象时出现的失真问题,通过对出错原因的分析,重新设计了Snake的外部能量函数,同时用像素在加权HSI颜色空间中的欧氏距离代替传统方法中常用的像素灰度的差分来近似图象梯度;最后,进行了对比实验,实验结果证明,改进后的算法,特别是在处理彩色图象时,大大优于原始方法.

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