在数学形态学中，开运算 被定义为先腐蚀后膨胀，具体定义请参见正文。
膨胀、腐蚀、开运算、闭运算是数学形态学的基础。
Erosion, dilation, opening operation and closing operation are the basis of mathematical morphology.
在预处理阶段，利用彩色HSV模型分割原IC图像，然后用形态学开运算消除背景噪音。
In preprocessing phase, the IC image is segmented using HSV color model and the background noises are removed from the IC noisy image by the morphological operating.
其次，利用形态学运算，对已除去噪声的二值SAR图像进行边缘提取，并对边缘图像进行形态学区域开运算，以去除较小的区域。
Secondly, the binary SAR image is processed by using morphological operations to extract edges of the object and remove smaller areas. Then lines are extracted by Hough transform.
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