This paper introduces an improved algorithm for fingerprint direction field estimation, the rotation angle estimation during constructing the singular point models is analyzed in details.
本文提出了一种改进的指纹纹线方向场计算方法，其中重点分析了奇异点模型中旋转角度的估计方法，并在复数域内简化了纹线方向场的优化计算。
The field of capture-recapture and removal is an important direction of mathematical statistics, which studies the estimation of the sizes of finite populations from incomplete random samples.
捕获再捕获与捕获移出研究是数理统计的一个重要方向，它研究如何利用随机样本估计有限群体的总体数目。
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