中文摘要：

在多帧图像复原中，一些观测图像质量较差，不能改善复原图像的质量，反而会使复原结果恶化，因此在复原前需要对其进行帧选。在对各种图像质量评价指标进行深入分析的基础上，提出了梯度和信息熵相结合的帧选准则。实验结果表明：帧选后的复原结果明显优于未帧选的复原结果，从而证明了文章所确定的帧选准则的合理性。

英文摘要：

For the multi-frame image restoration, some observed images are so bad that they will make the quality of the restored images worse rather than improve them. Therefore, before the restoration, it is needed to select the observed images first. Based on the analysis of some image quality standards, this paper presents the image selecting criterion considering both the grades and the Shannon entropy. The experiment result shows that the restored image with the selected images is much better than that with the unselected images. So the result proves the validity of the image selecting criterion.