指纹特征信息是基于指纹脊线谷线结构的，指纹的结构从宏观上看是由脊线（Ridge，也叫纹线）和谷线（Valleys）组成。脊线是手指皮肤上生理隆起的部分；谷线是手指皮肤上生理凹陷的部分。
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褶皱是指穿过指纹脊线和谷线的不规则条纹。
The crease is a kind of stripes irregularly crossing ridges and valleys in the fingerprint.
个体指纹被采集成指纹图像后，首先采用基于自身灰度均值和方差的规格化方法，降低指纹脊、谷线之间的灰度变化程度；
Based on the mean value and variance, the image normalizing is to reduce the variations of gray between fingerprint ridges and furrows;
乘坐地铁一号线（运营时间为06：30-23：30），在世界之窗站下车，从 A 出口出去，然后步行约3分钟即可到达欢乐谷。
By subway Line 1 (running between 06: 30 - 23: 30), get off at the stop of Window of the World Station and leave from Exit A, then walk for about 3 minutes to Happy Valley.
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