（2）用形态学开运算（Morphological opening）估计背景。通过调用im叩en并对输入图像I执行形态 学开运算，取半径为15的圆盘结构元素，且结构元素通过函数screI建立。
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morphological opening-and-closing operation 形态学开闭运算
generalized morphological opening-closing transform 广义形态开闭变换
morphological trivial opening 形态学普通开运算
The traditional 3-layer feed forward BP network modal of morphological opening and closing operation was modified by extending the input layer data.
采用扩展输入层数据的办法修正了传统的形态开、闭运算三层前馈BP网络模型。
Morphological opening-closing is implemented using vertex-collapse algorithm. A nonlinear scale space will be constructed efficiently with perfect shape preserving.
然后采用顶点塌缩算法实现的彩色形态学开闭算子生成了所需的非线性尺度空间；
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