介绍了椭圆曲线密码体制的数学基础，及其应用模型，并为计算椭圆曲线的阶提出了一个有效的算法。
This paper introduce the math basis of Elliptic curve cryptography, and it 's cryptosystems, then provide a valid method to compute the order of Elliptic curve.
当它是曲线的时候，其弯曲的法则看起来至少是一阶至多是二阶。
When it is curved, the law of its curvature seems to be at the least of the first and at the most of the second order.
利用相关系数在真实匹配点附近的统计特性，通过对相关系数进行曲线拟合，根据其一阶导数确定最大相关系数所在的位置，快速得到亚像素匹配点。
By using the statistic properties of the correlation coefficient, a curve correlation coefficient is calculated, and then the matching point is obtained through evaluating it's derivative function.
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