How to find a kind of method that not only is able to reduce the noise effectively but also can retain edge information of the image well is always being pursued by people.
如何寻求一种既能有效地减少噪声、又能很好地保留图像边缘信息的方法，一直是人们努力追求的目标。
In order to retain the weak edge information while denoise, the circulation translation method is used again.
为了在去噪声的同时更多地保留弱边缘信息，再次利用到循环平移的方法。
The enhanced gradient operator was designed to stand out the edge of image and retain the low frequency information.
此外还开发了增强型的梯度锐化算子，它既突出了边缘信息，又保留了低频信息，便于人和机器的一些后续处理。
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