A new method which using two order keystone transform to correct quadratic migration and frequency domain correction to correct once migration was proposed.
提出了一种新的解决方法，即利用二阶keystone变换补偿时间二次项，然后用频域校正算法补偿时间一次项。
Entrance is indispensability factor of building, it is keystone of forming the sequence space and control the transform of differ space.
而入口是建筑形态构成不可缺少的基本元素之一，它控制着两种不同空间的转换，是形成空间序列和节奏性的关键所在。
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