有资料表明，在当前的技术状态下，只有预先了解引起图像降质的原因，对无参考图像进行质量判别才是可行的。
Furthermore, there are no references for many aerial images and it is feasible to evaluate image quality only by knowing the cause of degrading image quality.
对其复原的目的在于补偿图像降质，使恢复后的图像尽可能地接近原始图像，为此要对恢复图像的质量进行评价。
The purpose of restoration is to compensate for image degradation, so that the restored image is as close as possible the original image. So the quality of restored image should be evaluated.
灰度等级少、对比度低的降质图像增强问题。
The image enhancement problem for degraded images with less gray levels and low contrasts.
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