directional template 方向模板
The most difficult, and oftentimes confusing, aspect of using non-ASCII characters in a template is the support for bi-directional languages such as Hebrew and Arabic.
在模板中使用非ascii字符的最困难和容易混淆的方面是对双向语言的支持，比如Hebrew和Arabic。
Firstly gain the continuously directional image of the fingerprint, secondly design orientation template using the directional image and filter the fingerprint image, lastly obtain the binary image.
先得到指纹图像的连续方向图，再根据此方向图设计方向滤波模板进行滤波，最后得到指纹的二值化图像。
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