A tangent is a straight line that just touches a curve, so the concept of "running the tangents" is to run the shortest distance possible by running straight from one curve to the next.
切线是一条直线，刚好接触到曲线，所以跑切线是从一个弯道跑到另一个最短的距离。
Equation about isometric polygon curve is set up with differential geometry theory. The curve is proved to be convex curve which the distance between any parallel tangent lines is equal.
应用微分几何理论，导出了等距曲线的方程，证明了它是具有任意两条平行切线之间距离都相等的卵形线。
Finally, we promote the number of tangent lines between minutias and core points, global match distance variance, and covariance distance to help make the final decision.
最后利用细节点到中心点之间的纹线切割数目、全局匹配距离和协方差距离来判断匹配的结果。
Finally, we promote the number of tangent lines between minutias and core points, global match distance variance, and covariance distance to help make the final decision.
最后利用细节点到中心点之间的纹线切割数目、全局匹配距离和协方差距离来判断匹配的结果。
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