《真影留踪———上海图书馆藏历史原照展》属于上海图书馆每年的 馆藏精品展示系列活动之一，展览自11月27日开始。

The photo display is the annual exhibition of historical documents by the Shanghai Library, "Shanghai Library Historic Photos Exposition."

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相位相关作为一种图像匹配技术对噪声有较高的容忍程度，检测结果与照度无关，受几何失真影响小。但该方法对旋转变化非常敏感。

Phase correlation algorithm as a kind of image matching method has many advantages such as insensitive to noise, unrelated to illumination of target, immune to geometric distortion.

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