本文中首次尝试了在频率域算法中加入金字塔模型，对原本低分辨率图像进行若干次下采样后层层配准提高精度。

In this paper, it is the first time for us to add the pyramid model to the algorithm by Vandewalle et al. to increase the accuracy by coarse-to-fine registering layered down-sampled images.

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通过迭代求解法和高斯金字塔模型，快速精确地估计得到配准参数，采用凸集投影（POCS）算法对图像序列进行了超分辨率重建。

Based on the set theoretic formulation, a projection onto convex sets (POCS) algorithm is applied to find the solution to face image reconstruction.

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