英译汉，帮忙翻译一下~谢谢，

In the unstructured environment is divided into gray-scale image of the degradation of the type of degradation and the degradation of the collection, including image noise, motion-blurred image, image affine transformation. Degradation for these images, this article extends the concept of image quality evaluation. Gray-scale degradation and geometric transformations are as image degradation, usually carried out to restore the image processing, to be more clear, higher-quality images. However, due to the degradation of the type of image it is difficult to determine in advance, and sometimes result in image restoration is not the desired results, and thus image degradation is not put forward the concept of variables, namely, degradation of a variety of image features remain the same volume, so to avoid the image recovery issues, directly to the degradation of image processing system as a visual object.
This paper analyzes the structure of invariant picture, the degradation of im