The image is based upon a stopped version of the instance and should not be confused with a snapshot which is a copy of a running instance including its in-memory state.
映像是基于实例停止后的版本，要与快照区分开，后者是正在运行的实例的副本，包括其内存状态在内。
For example, it costs more for storage and the distance computation is quite complex. With the number of images grows, it will be unsuitable for vector based image feature to stay in memory.
当图像数量增长到一定数量后，基于浮点矢量形式表示的图像特征就不适合放置在内存中，欧氏距离的计算也将造成较大的时间开销。
Based on the linear memory construction of digital image, this paper presents a method of fast realization of image rotation.
基于图像的线性存储结构，提出了一种图像旋转的快速实现方法。
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