文章研究了目前的指纹图像增强算法，提出了一种新的指纹方向场的动态计算方法。
In this paper, we studied the algorithms of fingerprint image enhancement and put forward a new method to calculate the direction image.
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。
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.
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