一种基于形态学运算的指纹方向场计算方法

指纹识别是生物认证技术中应用最为广泛的技术之一，其中指纹方向场计算是自动指纹识别系统中最关键 的步骤，指纹图像预处理、特征提取和匹配的过程都以方向场为基础。因此提出一种基于对指纹图像方向场进行形态 学运算的方向场计算方法。实验证明，该方法可以正确有效地计算低质量指纹图像，特别是褶皱类型指纹图像的方向 场。

Fingerprint Orientation Estimation Based on Morphological Operation

Fingerprint recognition is one of the most popular methods for biometric authentication. In the process of rc cognition, the ridge orientation estimation is the most important step, since it serves for segmentation, enhancement, mi- nutiae extraction and matching. We proposed a method for orientation estimation based on morphological operation to regulate the orientation field. The experience shows that this method can correctly and robustly estimate the fingerprint orientation field for low cauality images, especially for those with creases.