基于局部字典的低质量指纹方向场提取

Improvement of Orientation Field in Low Quality Fingerprint Based on Local Dictionary

针对低质量指纹含有较多噪声,将导致错误的方向场,文章以字典估计为基础,对其中一些参数进行改进,并且在挑选最后方向场块时考虑局部信息,提出了一种快速从候选方向场块组中挑选最优方向场块的方法。

For much noise in the low quality fingerprints will lead to inaccurate orientation field, this paper proposes a new way to rebuild the lost orientation which based on the dictionary＇s estimation with modified parameters. And the process of choosing final diriction block takes the local information into consideration, a fast way of picking the optimal direction field blocks from the candidate block groups is acquired.