基于方向差异场的指纹图像粗糙对齐  

Coarse alignment of fingerprint images based on orientation difference field

作　　者：陈晖[1] 殷建平[1] 舒欣 祝恩[1] 胡春风[1] 

机构地区：[1]国防科学技术大学计算机学院,长沙410073 [2]军事经济学院襄樊分院,湖北襄阳441118

出　　处：《吉林大学学报（工学版）》2012年第2期459-462,共4页Journal of Jilin University:Engineering and Technology Edition

基　　金：国家自然科学基金项目(60603015;60970034);高等学校全国优秀博士学位论文作者项目(2007B4);湖南省教育厅科研项目(湖南省优秀博士学位论文获得者资助项目)

摘　　要：基于指纹方向场特征,在指纹识别早期阶段实现指纹图像的粗糙对齐,进而分割出两幅指纹图像之间的重叠区域,减少了后续特征提取和匹配阶段需要处理的数据量,并提高了指纹图像匹配准确率。定义了指纹方向差异场,将指纹方向场转换为指纹方向差异场,然后基于指纹方向差异场对齐指纹图像,有效降低了指纹方向场相关性计算过程的计算开销,同时抑制了指纹图像中非线性形变对指纹方向场可能造成的影响。实验结果验证了所提出方法的有效性。Fingerprint orientation field is used to align two fingerprint images coarsely in the early fingerprint image match stage; then the overlapped regions between the two fingerprint impressions are segmented. To avoid spending too much time in correlating two fingerprint orientation images, fingerprint orientation difference field is defined, and before the orientation-- field--based fingerprint image alignment, the orientation field is transferred to orientation difference field. It not only reduces the computation cost, but also helps to reduce the effect of global distortion on fingerprint orientation images. Experiment results show that the proposed method can improve the accuracy and efficiency of fingerprint image alignment.

关 键 词：计算机应用 指纹识别 指纹图像对齐 指纹方向场 方向差异场 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]