处理照片有两大任务——从普遍黯淡的天体里提取最多的细节，以及去除噪点。

There are two main tasks while processing the pictures – to drag the maximum details from the usually dim objects and noise removing.

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现在我们要开始去除这些噪点。

We can now start to get rid of the artifacts.

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但这种非线性扩散方程在进行图像去噪的过程中存在两个缺点：滤波过后依然存在孤立噪声点和边缘处的噪声难以去除。

There are two shortcomings when such filter is used for image denoising: single speckle is reserved after filtering and noise at edges cannot be eliminated successfully.

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