为了加快匹配搜索的速度，采用查找表的方式构建径向模式库。

In order to speed up the search process, a radial mode database is constructed through table lookup.

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该方法利用具有旋转不变性的径向特征作初始匹配，而以环向特征作后续匹配，并用FOV约束进一步剔除冗余匹配。为了加快匹配搜索的速度，采用查找表的方式构建径向模式库。

With radial features with cyclic invariance as initial match and cyclic features as follow-up match, the algorithm applies FOV constrain to further eliminating redundant match.

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设置渐变模式为 径向(圆形)渐变 。

Set the gradient style to Radial Gradient .

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