对一幅给定的道路图像，首先计算其梯度图像，然后利用HOUGH变换确定粗略道路区。
Compute the gradient to a road image, and then make HOUGH transform on it.
相比于小波变换等方法，该方法更好地再现了云层覆盖区的地物信息，具有更好的图像光滑度和清晰度。
Compared with methods of wavelet transform, the method using in this paper can better reappear the ground information of cloud covering and have better image smoothness and image definition.
通过实验制作了表示密度-颜色变换的等色线区图。
The chart of isochromatic region indicating the transformation between density and color is made by experiment.
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