然后，系统地对降低X射线数字图像质量的因素进行了研究，并应用图像增强和图像复原的方法对降质X射线数字图像进行处理。
Then, the factors degrading image quality of X -ray digital image are studied systemically, the method of image enhancing and image restoration is applied to degraded X -ray digital image.
若把成像系统作为线性空变系统来进行处理，根据等晕成像原理，如将降质图像分割为不同区域进行复原的话，则可以有效地提高图像的恢复效果。
The result will be improved if the degraded image is divided into regions to be restored according to the isoplanatic theory, on the basis of that the system is a linear variant one.
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