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1. 发明申请

US20050157913A1 Fingerprint recognition system 审中-公开
公开(公告)号：US20050157913A1
公开(公告)日：2005-07-21
申请号：US11081213
申请日：2005-03-16
申请人： Shing-Tung Yau , Xianfeng Gu , Zhiwu Zhang
发明人： Shing-Tung Yau , Xianfeng Gu , Zhiwu Zhang
IPC分类号： G06K9/00
CPC分类号： G06K9/00067 , G06K9/00073 , G06K9/0008 , G06K9/00087 , G06K9/036
摘要： A method of analyzing and recognizing fingerprint images that utilizes vector processing of a vector field that is defined as the tangential vector of the fingerprint ridge curves is disclosed. The raw fingerprint image is divided into blocks, filtered to remove noise, and the orientation direction of each block is found. This allows the ridge curves to be enhanced and approximated by piece-wise linear approximations. The piece-wise linear approximations to the ridge curves allow the minutiae to be extracted and classified and a fingerprint minutiae template to be constructed. An enrollment process gathers multiple fingerprint images, creates fingerprint minutiae templates corresponding to the acquired fingerprint images, and stores the templates and other data associated with the respective individual or the enrolled fingerprint in a fingerprint database. In an identification process, an unknown raw fingerprint image is obtained via a fingerprint scanner and processed similarly to the enrollment process such that the fingerprint minutiae template of the unknown fingerprint is compared to one or more previously enrolled fingerprint minutiae templates. The identity of the individual associated with the unknown fingerprint is thereby ascertained. In addition, live finger detection can be accomplished in conjunction with the verification or identification process through analysis of the fingerprint image thus enhancing the security of the overall system.

2. 发明申请

US20080095413A1 Fingerprint recognition system 审中-公开
标题翻译：指纹识别系统
公开(公告)号：US20080095413A1
公开(公告)日：2008-04-24
申请号：US11643045
申请日：2006-12-19
申请人： Shing-Tung Yau , Xianfeng Gu , Zhiwu Zhang
发明人： Shing-Tung Yau , Xianfeng Gu , Zhiwu Zhang
IPC分类号： G06K9/00
CPC分类号： G06K9/00067 , G06K9/00073 , G06K9/0008 , G06K9/00087 , G06K9/036
摘要： A method of analyzing and recognizing fingerprint images that utilizes vector processing of a vector field that is defined as the tangential vector of the fingerprint ridge curves is disclosed. The raw fingerprint image is divided into blocks, filtered to remove noise, and the orientation direction of each block is found. This allows the ridge curves to be enhanced and approximated by piece-wise linear approximations. The piece-wise linear approximations to the ridge curves allow the minutiae to be extracted and classified and a fingerprint minutiae template to be constructed. An enrollment process gathers multiple fingerprint images, creates fingerprint minutiae templates corresponding to the acquired fingerprint images, and stores the templates and other data associated with the respective individual or the enrolled fingerprint in a fingerprint database. In an identification process, an unknown raw fingerprint image is obtained via a fingerprint scanner and processed similarly to the enrollment process such that the fingerprint minutiae template of the unknown fingerprint is compared to one or more previously enrolled fingerprint minutiae templates. The identity of the individual associated with the unknown fingerprint is thereby ascertained. In addition, live finger detection can be accomplished in conjunction with the verification or identification process through analysis of the fingerprint image thus enhancing the security of the overall system.
摘要翻译：公开了一种分析和识别使用定义为指纹脊曲线的切向矢量的矢量场的矢量处理的指纹图像的方法。原始指纹图像被分成块，过滤以去除噪声，并且找到每个块的取向方向。这允许通过分段线性近似增强和近似脊曲线。对脊曲线的分段线性近似允许提取和分类细节，并构建指纹细节模板。注册过程收集多个指纹图像，创建与所获取的指纹图像相对应的指纹细节模板，并将与相应个体或登记指纹相关联的模板和其他数据存储在指纹数据库中。在识别过程中，通过指纹扫描器获得未知的原始指纹图像，并且与注册过程类似地进行处理，使得将未知指纹的指纹细节模板与一个或多个先前注册的指纹细节模板进行比较。由此确定与未知指纹相关联的个体的身份。此外，通过分析指纹图像可以结合验证或识别过程来实现实时手指检测，从而增强整个系统的安全性。

3. 发明授权

US06876757B2 Fingerprint recognition system 失效
标题翻译：指纹识别系统
公开(公告)号：US06876757B2
公开(公告)日：2005-04-05
申请号：US10156447
申请日：2002-05-28
申请人： Shing-Tung Yau , Xianfeng Gu , Zhiwu Zhang
发明人： Shing-Tung Yau , Xianfeng Gu , Zhiwu Zhang
IPC分类号： G06K9/00
CPC分类号： G06K9/00067 , G06K9/00073 , G06K9/0008 , G06K9/00087 , G06K9/036
摘要： A method of analyzing and recognizing fingerprint images that utilizes vector processing of a vector field that is defined as the tangential vector of the fingerprint ridge curves is disclosed. The raw fingerprint image is divided into blocks, filtered to remove noise, and the orientation direction of each block is found. This allows the ridge curves to be enhanced and approximated by piece-wise linear approximations. The piece-wise linear approximations to the ridge curves allow the minutiae to be extracted and classified and a fingerprint minutiae template to be constructed. An enrollment process gathers multiple fingerprint images, creates fingerprint minutiae templates corresponding to the acquired fingerprint images, and stores the templates and other data associated with the respective individual or the enrolled fingerprint in a fingerprint database. In an identification process, an unknown raw fingerprint image is obtained via a fingerprint scanner and processed similarly to the enrollment process such that the fingerprint minutiae template of the unknown fingerprint is compared to one or more previously enrolled fingerprint minutiae templates. The identity of the individual associated with the unknown fingerprint is thereby ascertained. In addition, live finger detection can be accomplished in conjunction with the verification or identification process through analysis of the fingerprint image thus enhancing the security of the overall system.
摘要翻译：公开了一种分析和识别使用定义为指纹脊曲线的切向矢量的矢量场的矢量处理的指纹图像的方法。原始指纹图像被分成块，过滤以去除噪声，并且找到每个块的取向方向。这允许通过分段线性近似增强和近似脊曲线。对脊曲线的分段线性近似允许提取和分类细节，并构建指纹细节模板。注册过程收集多个指纹图像，创建与所获取的指纹图像相对应的指纹细节模板，并将与相应个体或登记指纹相关联的模板和其他数据存储在指纹数据库中。在识别过程中，通过指纹扫描器获得未知的原始指纹图像，并且与注册过程类似地进行处理，使得将未知指纹的指纹细节模板与一个或多个先前注册的指纹细节模板进行比较。由此确定与未知指纹相关联的个体的身份。此外，通过分析指纹图像可以结合验证或识别过程来实现实时手指检测，从而增强整个系统的安全性。

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