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2. 发明申请

US20100278397A1 Authentication Device And Authentication Method 失效
标题翻译：验证设备和验证方法
公开(公告)号：US20100278397A1
公开(公告)日：2010-11-04
申请号：US12675207
申请日：2008-08-27
申请人： Takeo Tobe , Kenzo Mizuno , Tetsuji Tsuji , Isao Watanabe , Isao Kikuchi , Tadahito Watakai
发明人： Takeo Tobe , Kenzo Mizuno , Tetsuji Tsuji , Isao Watanabe , Isao Kikuchi , Tadahito Watakai
IPC分类号： G06T7/00
CPC分类号： G06K9/00033 , A61B5/117 , A61B5/1171 , A61B5/1172 , A61B5/489 , A61B5/6826 , A61B5/6838 , G06K9/2027 , G06K2009/0006 , G06K2009/00932
摘要： An authentication can be carried out with high accuracy even when there is a change in an amount of incident light, the air temperature, the body temperature, or a manner to place a finger on a scanner.An authentication apparatus includes: a light source that emits an infrared light beam onto a finger; image pick-up means 8 that picks up an image of the finger by using a transmitted light beam, and thus outputs an image signal; low-frequency brightness component extracting means 61 that extracts a low-frequency brightness component signal from the image signal; middle-frequency brightness component extracting means 62 that extracts a middle-frequency brightness component signal from the image signal; correction means 63 that corrects the middle-frequency brightness component signal using the low-frequency brightness component signal; quaternary-value converting means 64 that converts the corrected middle-frequency brightness component signal into quaternary values such that the quaternary values are distributed at a predetermined ratio; storage means 7 that stores a quaternary-valued image obtained by the quaternary value conversion; correlation coefficient calculating means 65 that calculates a correlation coefficient between a quaternary-valued evaluation image as an object of evaluation obtained by the quaternary value conversion, and a quaternary-valued registered image beforehand stored in the storage means, by using a pattern matching method based on a normalized correlation method; and judgment means 66 that judges whether or not the quaternary-valued evaluation image and the quaternary-valued registered image are images picked up from the same finger on a basis of the correlation coefficient.
摘要翻译：即使当入射光量，空气温度，体温变化，或者将手指放置在扫描仪上的方式时，也能够高精度地进行认证。认证装置包括：将红外光束发射到手指上的光源; 图像拾取装置8，其通过使用透射光束拾取手指的图像，从而输出图像信号; 低频亮度分量提取装置61，从图像信号中提取低频亮度分量信号; 中频亮度分量提取装置62，从图像信号中提取中频亮度分量信号; 校正装置63，其使用低频亮度分量信号校正中频亮度分量信号; 四进制值转换装置64，其将校正的中频亮度分量信号转换为四进制值，使得四进制值以预定比例分布; 存储装置7，存储通过四次值转换获得的四值值图像; 相关系数计算装置65，其通过使用基于模式匹配方法来计算作为通过四进制值转换获得的评估对象的四元值评估图像和预先存储在存储装置中的四值注册图像之间的相关系数，采用归一化相关法; 以及判断装置66，其判断四值估值图像和四值值登记图像是否是基于相关系数从同一手指拾取的图像。

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