Abstract: To deal with the broken edge and conglutination edge in segmentation image by canny algorithm,an algorithm after segmentation is put forward which deal with the canny edge image multitimes with morphological open operator and close operator based on different structure units.Firstly,the algorithm used some disc structure units which dimension is increasing to process the edge image.At the same time,in order to lessen the interacting of the objects,the algorithm filtered the objects before next close operation which have had good segmentation.Lastly,in order to break the conglutination between different objects,the algorithm processes the image of objects which have bad segmentation with open operation by appropriate structure unit.The experiments’ result shows that the algorithm could joint the broken edge and break the conglutination effectively.The Algorithm improved the result of canny algorithm and depressed the reliance on the parameters of canny algorithm.

Key words: Canny Algorithm, close operator, open operator, multi structure units

摘要： 针对Canny图像分割算法容易出现目标边缘断裂和粘连现象,根据数学形态学中开闭运算的性能,结合目标基本形状特征,提出了多结构元多层次图像分割后处理算法。算法利用多个尺寸逐渐增大的圆盘结构元,对目标边缘图进行闭运算,每次运算前根据目标基本形状特征过滤已达到好的分割效果目标,同时选择合适尺寸结构元对分割不好目标图像进行开运算,消除目标之间粘连及目标边缘突起。实验结果表明算法能够有效平滑目标轮廓,连接断裂边缘,去除目标粘连,算法提高了Canny边缘检测算子的图像分割准确性,减少了对Canny算子对参数的依赖性。

关键词: Canny算子, 闭运算, 开运算, 多结构元