The effect of the block directional-based binary method for fingerprint image is mainly determined by the estimate accuracy of the block direction.
基于块方向信息的指纹图像二值化方法,其效果主要取决于能否准确的估计指纹图像的块方向图。
So the block direction obtained by this method can correspond to the tendency of the lines in the whole image precisely.
针对该方法得到的块方向图会出现奇异点漂移的现象,使用一种低通滤波的办法来修正块方向图。
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