The denoising of a natural image corrupted by Gaussian noise is a classical problem in image processing.

如何去除自然图像中的高斯白噪声是图像处理中的一个经典问题。

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In most situations we will deal with image noise with high density, especially it is very difficult for processing image corrupted by salt-and-pepper noise with high probabilities.

在许多场合都会遇到高强度噪声的图像，特别是椒盐噪声的滤除非常困难。

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When authorised users open the file, they see the watermark, which tells them that the image has not been manipulated or corrupted in some irreversible way.

ECONOMIST: MONITOR