公开(公告)号：US08275179B2

公开(公告)日：2012-09-25

申请号：US12105212

申请日：2008-04-17

申请人： Ming Hsieh ,  Ankuo Wang ,  Fei Zhou ,  Wheshi Chen

发明人： Ming Hsieh ,  Ankuo Wang ,  Fei Zhou ,  Wheshi Chen

IPC分类号： G06K9/00

CPC分类号： G06K9/00046

摘要： An apparatus for capturing the image of a wet/moist fingerprint. The apparatus includes: a prism having an imaging plane on which a finger having valleys and ridges is place, a bottom plane parallel to the imaging plane and a reflective plane intercepting the imaging plane and intercepting the bottom plane at an angle α; a light source for generating a light with an incident angle of approximately 0° with respect to a surface normal of the imaging plane; and a lens for capturing light reflected from the reflective plane. The apparatus further includes an image sensor for generating an image of the valleys and ridges of the finger, wherein the reflective plane is arranged in such a way to meet the equation of α>45 +(arc sin (n1/n2))/2, where n1 is a refraction index of medium filled between the valleys of the finger and the imaging plane, and n2 is refraction index of the prism.

摘要翻译： 用于捕获湿/湿指纹图像的装置。 该装置包括：具有成像平面的棱镜，具有谷和脊的手指位于该成像平面上，平行于成像平面的底平面和与成像平面截取并以角度α截取底平面的反射平面; 用于产生相对于成像平面的表面法线大约为0°的入射角的光的光源; 以及用于捕获从反射平面反射的光的透镜。 该装置还包括用于产生手指的谷和脊的图像的图像传感器，其中反射平面以满足α> 45 +（arcsin（n1 / n2））/ 2的等式的方式布置 ，其中n1是在手指的谷部和成像平面之间填充的介质的折射率，n2是棱镜的折射率。

公开(公告)号：US20080273771A1

公开(公告)日：2008-11-06

申请号：US12105212

申请日：2008-04-17

申请人： Ming Hsieh ,  Ankuo Wang ,  Fei Zhou ,  Wheshi Chen

发明人： Ming Hsieh ,  Ankuo Wang ,  Fei Zhou ,  Wheshi Chen

IPC分类号： G06K9/00

CPC分类号： G06K9/00046

摘要： An apparatus for capturing the image of a wet/moist fingerprint. The apparatus includes: a prism having an imaging plane on which a finger having valleys and ridges is place, a bottom plane parallel to the imaging plane and a reflective plane intercepting the imaging plane and intercepting the bottom plane at an angle α; a light source for generating a light with an incident angle of approximately 0° with respect to a surface normal of the imaging plane; and a lens for capturing light reflected from the reflective plane. The apparatus further includes an image sensor for generating an image of the valleys and ridges of the finger, wherein the reflective plane is arranged in such a way to meet the equation of α>45 +(a sin(n1/n2))/2, where n1 is a refraction index of medium filled between the valleys of the finger and the imaging plane, and n2 is refraction index of the prism.

摘要翻译： 用于捕获湿/湿指纹图像的装置。 该装置包括：具有成像平面的棱镜，具有谷和脊的手指位于该成像平面上，平行于成像平面的底平面和与成像平面截取并以α角截取底平面的反射平面; 用于产生相对于成像平面的表面法线大约为0°的入射角的光的光源; 以及用于捕获从反射平面反射的光的透镜。 该装置还包括用于产生手指的谷和脊的图像的图像传感器，其中反射平面以这样的方式布置以满足α≥45+的方程（a sin（n <1） 其中n 1是在手指的谷部和成像平面之间填充的介质的折射率，n <1 / 2 是棱镜的折射率。