由于遥感图像一般带有较大的噪声，通过实验表明，用传统的边缘检测方法效果不理想。
Experiments indicate that the traditional methods of edge detection are not ideal because of the bigger noise of remote sense image.
试验结果表明，利用SOBEL边缘检测算子进行数字图像的边缘检测和提取其效果比较理想。
The result of experiment indicate that it is relatively effective for SOBEL operator to realize digital image fringe detecting and picking up.
为了得到比较理想的道路图像中车道标识的边缘，文中采用了基于二维直方图熵最大化的车道标识边缘提取方法。
In order to get an ideal lane marks' edge in a road image, this paper USES a method which is based on maximum two-dimension entropy to pick-up lane mark edges.
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