CN104123539B - A kind of method and apparatus for improving fingerprint identification device recognition accuracy - Google Patents
A kind of method and apparatus for improving fingerprint identification device recognition accuracy Download PDFInfo
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Abstract
本发明涉及指纹识别技术领域，具体为一种提高指纹识别装置识别准确率的方法和装置。所述装置以紫外光为检测载体，由紫外带通滤光片和分光片将通过聚光透镜获取的平行光(18)过滤后得到的紫外光等分成紫外光a(8)和紫外光b(13)；紫外光b(13)直接入射紫外光强度检测器；紫外光a(8)经指纹识别区反射后得到射紫外光c(9)；经由积分球获取紫外光d(20)入射紫外光强度检测器；紫外光强度检测器将紫外光b(13)与紫外光d(20)的光强信息发送给控制器；由控制器计算紫外光d(20)与紫外光b(13)光强的比值；控制器根据计算得的信息做出判断，结论为皮肤或指纹膜及指纹套一类的指纹载体并决定是否授权报警装置提示当前身份验证信息错误。
The invention relates to the technical field of fingerprint identification, in particular to a method and a device for improving the identification accuracy of a fingerprint identification device. The device uses ultraviolet light as a detection carrier, and the ultraviolet light obtained after filtering the parallel light (18) obtained by the condenser lens is divided into ultraviolet light a (8) and ultraviolet light b by an ultraviolet bandpass filter and a spectroscopic sheet. (13); ultraviolet light b (13) is directly incident on the ultraviolet light intensity detector; ultraviolet light a (8) is reflected by the fingerprint identification area to obtain ultraviolet light c (9); ultraviolet light d (20) is incident through the integrating sphere Ultraviolet light intensity detector; the ultraviolet light intensity detector sends the light intensity information of ultraviolet light b(13) and ultraviolet light d(20) to the controller; the controller calculates the ultraviolet light d(20) and ultraviolet light b(13 ) ratio of light intensity; the controller makes a judgment based on the calculated information, concludes that it is a fingerprint carrier such as skin or fingerprint film and fingerprint cover, and decides whether to authorize the alarm device to prompt the current identity verification information error.
Description
技术领域technical field
本发明涉及指纹识别技术领域，具体为一种提高指纹识别装置识别准确率的方法和装置。The invention relates to the technical field of fingerprint identification, in particular to a method and a device for improving the identification accuracy of a fingerprint identification device.
背景技术Background technique
指纹识别技术的核心技术为指纹的识别的算法，其技术目的为对待识别人进行身份确认。现有技术中的指纹识别装置分为光学类和晶体类，其中广泛采用的光学类中的激光指纹识别技术的技术方案为：The core technology of fingerprint identification technology is the algorithm of fingerprint identification, and its technical purpose is to confirm the identity of the person to be identified. The fingerprint identification devices in the prior art are divided into optical type and crystal type, and the technical scheme of the widely used optical type laser fingerprint identification technology is as follows:
将激光投射在人的手指指纹的凹凸面；Project the laser on the concave-convex surface of the human finger print;
被投射的激光由手指指纹的凹凸面反射到感应板上；The projected laser light is reflected from the concave and convex surface of the fingerprint to the sensor board;
被反射到感应板上的激光形成一幅图片；The laser light reflected onto the sensing plate forms a picture;
将形成的图片与之前人们采集的指纹进行比较，如果相同，则被确认是本人。The resulting picture is compared with the fingerprints collected by people before, and if they are the same, it is confirmed to be the person.
但这一技术方案存在如下技术缺陷：因激光识别只能识别到手指的表皮指纹，但表皮指纹纹路极易被获取后进行仿制。激光射在硅胶指纹膜或指纹套上，如果硅胶指纹膜或指纹套上面的纹路清晰，指纹识别装置就会将仿制信息识别为正确的指纹信息而通过验证。目前市场上在售的指纹膜及指纹套等产品按说明正确制作之后能成功的欺骗激光指纹识别装置，对应用这一技术进行身份识别的技术效果构成严重的技术威胁。However, this technical solution has the following technical defects: because the laser recognition can only recognize the skin fingerprint of the finger, but the skin fingerprint pattern is very easy to be obtained and copied. The laser is shot on the silicone fingerprint film or the fingerprint cover. If the lines on the silicone fingerprint film or the fingerprint cover are clear, the fingerprint identification device will recognize the imitation information as the correct fingerprint information and pass the verification. At present, the products such as fingerprint films and fingerprint covers currently on the market can successfully deceive laser fingerprint recognition devices after being correctly manufactured according to the instructions, which poses a serious technical threat to the technical effect of applying this technology for identity recognition.
现有技术中广泛采用的晶体类中的电容指纹膜识别技术在指纹识别方面也存在同样类似的识别安全隐患。The capacitive fingerprint film recognition technology widely used in the prior art also has similar potential safety hazards in fingerprint recognition.
由科学实验结论得出不同材料对近紫外光的吸收率和反射率不同，不同肤色、不同性别和不同年龄的人皮肤对近紫外光(波长为330-400nm)的吸收率在75％～90％之间，而皮肤对近紫外光(波长为330-400nm)的反射率在10％～25％之间。硅胶指纹膜、橡胶指纹膜和电容指纹膜等不同类型的指纹膜对近紫外光的吸收率均小于55％，对近紫外光的反射率在45％以上。According to the conclusions of scientific experiments, different materials have different absorptivity and reflectivity to near-ultraviolet light. The absorptivity of human skin to near-ultraviolet light (wavelength 330-400nm) is between 75% and 90%. %, while the reflectance of the skin to near ultraviolet light (wavelength 330-400nm) is between 10% and 25%. Different types of fingerprint films, such as silicone fingerprint film, rubber fingerprint film and capacitive fingerprint film, have an absorption rate of less than 55% for near-ultraviolet light, and a reflectivity of more than 45% for near-ultraviolet light.
发明内容Contents of the invention
(一)要解决的技术问题(1) Technical problems to be solved
本发明提供一种能分辨真实手指与携带同样指纹信息的指纹膜或指纹套一类的指纹载体的方法和装置。本发明以紫外光为检测载体，通过紫外光强度检测器对反射回的带有辨别信息的紫外光进行检测并将检测结果发送至CPU控制器，由CPU控制器判断得出检测中的指纹是来自真实的手指还是携带指纹信息的指纹膜或指纹套一类的指纹载体的结论，并由控制器决定是否还需做进一步的指纹识别或发出身份识别错误的警告信息反馈。The invention provides a method and a device capable of distinguishing a real finger from a fingerprint carrier such as a fingerprint film or a fingerprint sleeve carrying the same fingerprint information. The present invention uses ultraviolet light as the detection carrier, detects the reflected ultraviolet light with identification information through the ultraviolet light intensity detector and sends the detection result to the CPU controller, and the CPU controller judges whether the fingerprint in the detection is Whether it comes from a real finger or a fingerprint carrier such as a fingerprint film or a fingerprint sleeve carrying fingerprint information, the controller decides whether to do further fingerprint identification or send out a warning message feedback of wrong identification.
(二)技术方案(2) Technical solution
为了解决上述技术问题，本发明提供了一种提高指纹识别装置识别准确率的方法，所述方法分为如下步骤：In order to solve the above technical problems, the present invention provides a method for improving the recognition accuracy of a fingerprint recognition device, the method is divided into the following steps:
提供波长范围仅连续覆盖0.33～0.4μm的紫外光的光源；A light source that provides ultraviolet light whose wavelength range only continuously covers 0.33-0.4 μm;
所述紫外光源发射的紫外光被分光片等分成紫外光a和紫外光b两份；The ultraviolet light emitted by the ultraviolet light source is equally divided into two parts of ultraviolet light a and ultraviolet light b by a spectroscopic sheet;
所述紫外光b入射紫外光强度检测器；The ultraviolet light b is incident on the ultraviolet light intensity detector;
所述紫外光a经指纹识别区反射后得到紫外光c；The ultraviolet light a is reflected by the fingerprint identification area to obtain ultraviolet light c;
所述紫外光c经由积分球获得紫外光d；The ultraviolet light c obtains ultraviolet light d through an integrating sphere;
所述紫外光d入射紫外光强度检测器；The ultraviolet light d incident ultraviolet light intensity detector;
所述紫外光强度检测器通过信号传输线将紫外光b与紫外光d的紫外光强度信息发送给CPU控制器；The ultraviolet light intensity detector sends the ultraviolet light intensity information of ultraviolet light b and ultraviolet light d to the CPU controller through the signal transmission line;
所述CPU控制器计算紫外光d与紫外光b的紫外光强度的比值；The CPU controller calculates the ratio of the ultraviolet light intensity of the ultraviolet light d to the ultraviolet light b;
所述CPU控制器根据计算得的所述比值做出判断：The CPU controller makes a judgment according to the calculated ratio:
若所述比值小于等于0.25且大于等于0.1，则识别结论为皮肤，所述CPU控制器授权指纹识别装置做进一步的身份识别；If the ratio is less than or equal to 0.25 and greater than or equal to 0.1, the identification conclusion is skin, and the CPU controller authorizes the fingerprint identification device to perform further identification;
若所述比值大于0.25或小于0.1，则识别结论为指纹膜或指纹套一类的指纹载体，所述CPU控制器通过信号传输线授权报警装置发出报警提示信息，提示当前身份验证信息错误。If the ratio is greater than 0.25 or less than 0.1, then the identification conclusion is a fingerprint carrier such as a fingerprint film or a fingerprint sleeve, and the CPU controller authorizes the alarm device to send an alarm message through the signal transmission line, prompting that the current identity verification information is wrong.
优选地，所述紫外光源由如下方法获得：Preferably, the ultraviolet light source is obtained by the following method:
由紫外光源发射出原始紫外光；The original ultraviolet light is emitted by the ultraviolet light source;
将所述原始紫外光通过聚光透镜获得平行紫外光；Passing the original ultraviolet light through a condenser lens to obtain parallel ultraviolet light;
将平行紫外光通过紫外带通滤光片，获得波长范围仅连续覆盖0.33～0.4μm的紫外光组成的紫外光源。Pass the parallel ultraviolet light through the ultraviolet band-pass filter to obtain an ultraviolet light source composed of ultraviolet light whose wavelength range only continuously covers 0.33-0.4 μm.
为了解决上述技术问题，本发明提供了一种提高指纹识别装置识别准确率的装置，包括能发射出波长范围至少连续覆盖0.33～0.4μm的紫外光源、CPU控制器、含指纹识别区的指纹识别器、报警装置和能读取接收到的所有紫外光的波长覆盖范围的紫外光强度信息的紫外光强度检测器，还包括聚光透镜、紫外带通滤光片、积分球和分光片；所述紫外带通滤光片仅允许通过波长范围在0.33～0.4μm的紫外光；所述聚光透镜位于所述紫外光源和紫外带通滤光片之间被用于获取平行紫外光；所述紫外带通滤光片位于所述分光片和所述紫外光源之间；所述分光片将通过所述紫外带通滤光片的紫外光等分成两份，一份直接反射到所述紫外光强度检测器，另一份经所述指纹识别器的指纹识别区反射后经由积分球射入所述紫外光强度检测器；所述紫外光强度检测器与所述CPU控制器通过信号传输线与所述CPU控制器双向信号连接；所述指纹识别器与所述CPU控制器双向信号连接；所述CPU控制器4与所述报警装置双向信号连接。In order to solve the above-mentioned technical problems, the present invention provides a device for improving the recognition accuracy of a fingerprint recognition device, which includes an ultraviolet light source capable of emitting a wavelength range at least continuously covering 0.33-0.4 μm, a CPU controller, and a fingerprint recognition device containing a fingerprint recognition area. detector, alarm device and ultraviolet light intensity detector that can read the ultraviolet light intensity information of the wavelength coverage range of all ultraviolet light received, and also includes a condenser lens, an ultraviolet bandpass filter, an integrating sphere and a spectroscopic sheet; The ultraviolet band-pass filter only allows to pass ultraviolet light in the wavelength range of 0.33-0.4 μm; the condenser lens is located between the ultraviolet light source and the ultraviolet band-pass filter to obtain parallel ultraviolet light; The ultraviolet band-pass filter is located between the spectroscopic sheet and the ultraviolet light source; the spectroscopic sheet divides the ultraviolet light passing through the ultraviolet band-pass filter into two parts, and one part is directly reflected to the ultraviolet light Intensity detector, the other part is reflected by the fingerprint recognition area of the fingerprint reader and then injected into the ultraviolet light intensity detector through the integrating sphere; the ultraviolet light intensity detector and the CPU controller communicate with the ultraviolet light intensity detector through a signal transmission line The two-way signal connection of the CPU controller; the two-way signal connection of the fingerprint reader and the CPU controller; the two-way signal connection of the CPU controller 4 and the alarm device.
优选地，所述指纹识别器为激光指纹识别器或晶体类电容指纹膜识别器。Preferably, the fingerprint reader is a laser fingerprint reader or a crystal capacitive fingerprint film reader.
(三)有益效果(3) Beneficial effects
本发明为指纹识别装置中的光学类激光指纹识别装置及晶体类电容指纹膜识别装置的身份识别准确率增加一道辅助检测防线，提高的身份识别的准确率，杜绝了应用携带指纹信息的指纹膜或指纹套一类的指纹载体欺骗指纹识别装置的这一行为的发生；积分球19的使用能对从指纹反射区反射回来的光起到更好的汇聚作用。The present invention adds an auxiliary detection line of defense to the identification accuracy of the optical laser fingerprint identification device and the crystal capacitive fingerprint film identification device in the fingerprint identification device, improves the accuracy of identification, and eliminates the use of fingerprint films that carry fingerprint information. Or the occurrence of this behavior that the fingerprint carrier such as the fingerprint sleeve deceives the fingerprint identification device; the use of the integrating sphere 19 can better converge the light reflected from the fingerprint reflection area.
附图说明Description of drawings
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.
图1是根据本发明一种提高指纹识别装置识别准确率的装置一个实施例的装置工作原理示意图；Fig. 1 is a schematic diagram of the device working principle of an embodiment of a device for improving the recognition accuracy of a fingerprint recognition device according to the present invention;
图2是根据本发明一种提高指纹识别装置识别准确率的装置一个实施例的控制器控制程序流程图。Fig. 2 is a flowchart of a controller control program of an embodiment of a device for improving the recognition accuracy of a fingerprint recognition device according to the present invention.
具体实施方式detailed description
下面结合说明书附图和实施例，对本发明的具体实施方式作进一步详细描述。以下实施例仅用于说明本发明，但不能用来限制本发明的范围。The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are only used to illustrate the present invention, but can not be used to limit the scope of the present invention.
图1所示，本发明提供了一种提高指纹识别装置识别准确率的装置，包括能发射出波长范围至少连续覆盖0.33～0.4μm的紫外光源1、CPU控制器4、含指纹识别区的指纹识别器6、报警装置12和能读取接收到的所有紫外光的波长覆盖范围的紫外光强度信息的紫外光强度检测器5，其特征在于，还包括聚光透镜17、紫外带通滤光片2、积分球19和分光片7；所述紫外带通滤光片2仅允许通过波长范围在0.33～0.4μm的紫外光；所述聚光透镜17位于所述紫外光源1和紫外带通滤光片2之间被用于获取平行紫外光；所述紫外带通滤光片2位于所述分光片7和所述紫外光源1之间；所述分光片7将通过所述紫外带通滤光片2的紫外光等分成两份，一份直接反射到所述紫外光强度检测器5，另一份经所述指纹识别器6的指纹识别区反射后经由积分球19射入所述紫外光强度检测器5；所述紫外光强度检测器5与所述CPU控制器4通过信号传输线11与所述CPU控制器4双向信号连接；所述指纹识别器6与所述CPU控制器4双向信号连接；所述CPU控制器4与所述报警装置12双向信号连接。As shown in Figure 1, the present invention provides a device for improving the recognition accuracy of a fingerprint recognition device, which includes an ultraviolet light source 1 capable of emitting a wavelength range of at least continuously covering 0.33-0.4 μm, a CPU controller 4, and a fingerprint containing a fingerprint recognition area Recognizer 6, alarm device 12 and the ultraviolet light intensity detector 5 that can read the ultraviolet light intensity information of the wavelength coverage range of all ultraviolet light that receive, it is characterized in that, also comprise condenser lens 17, ultraviolet band-pass filter light sheet 2, integrating sphere 19 and spectroscopic sheet 7; the ultraviolet bandpass filter 2 only allows ultraviolet light in the wavelength range of 0.33 to 0.4 μm; the condenser lens 17 is located between the ultraviolet light source 1 and the ultraviolet bandpass Used to obtain parallel ultraviolet light between the filters 2; the ultraviolet bandpass filter 2 is located between the spectroscopic sheet 7 and the ultraviolet light source 1; the spectroscopic sheet 7 will pass through the ultraviolet bandpass The ultraviolet light of the optical filter 2 is equally divided into two parts, one part is directly reflected to the ultraviolet light intensity detector 5, and the other part is reflected by the fingerprint recognition area of the fingerprint reader 6 and injected into the said ultraviolet light through the integrating sphere 19. Ultraviolet light intensity detector 5; described ultraviolet light intensity detector 5 and described CPU controller 4 are connected with described CPU controller 4 two-way signals by signal transmission line 11; Described fingerprint reader 6 is connected with described CPU controller 4 Two-way signal connection; the CPU controller 4 is connected to the alarm device 12 by two-way signal.
本发明提供了一种提高指纹识别装置识别准确率的方法，所述方法分为如下步骤：The invention provides a method for improving the recognition accuracy of a fingerprint recognition device, the method is divided into the following steps:
提供波长范围仅连续覆盖0.33～0.4μm的紫外光的光源15；A light source 15 that provides ultraviolet light whose wavelength range only continuously covers 0.33-0.4 μm;
所述紫外光源15发射的紫外光被分光片7等分成紫外光a8和紫外光b13两份；The ultraviolet light emitted by the ultraviolet light source 15 is equally divided into two parts of ultraviolet light a8 and ultraviolet light b13 by the spectroscopic sheet 7;
所述紫外光b13入射紫外光强度检测器；The ultraviolet light b13 incident ultraviolet light intensity detector;
所述紫外光a8经指纹识别区反射后得到紫外光c9；The ultraviolet light a8 is reflected by the fingerprint identification area to obtain ultraviolet light c9;
所述紫外光c9经由积分球获得紫外光d20；The ultraviolet light c9 obtains ultraviolet light d20 through an integrating sphere;
所述紫外光d20入射紫外光强度检测器；The ultraviolet light d20 incident ultraviolet light intensity detector;
所述紫外光强度检测器通过信号传输线11将紫外光b13与紫外光d20的紫外光强度信息发送给CPU控制器4；The ultraviolet light intensity detector sends the ultraviolet light intensity information of the ultraviolet light b13 and the ultraviolet light d20 to the CPU controller 4 through the signal transmission line 11;
所述CPU控制器4计算紫外光d20与紫外光b13的紫外光强度的比值；The CPU controller 4 calculates the ratio of the ultraviolet light intensity of the ultraviolet light d20 to the ultraviolet light b13;
所述CPU控制器4根据计算得的所述比值做出判断：The CPU controller 4 makes a judgment according to the calculated ratio:
若所述比值小于等于0.25且大于等于0.1，则识别结论为皮肤，所述CPU控制器4授权指纹识别装置做进一步的身份识别；If the ratio is less than or equal to 0.25 and greater than or equal to 0.1, the identification conclusion is skin, and the CPU controller 4 authorizes the fingerprint identification device to perform further identification;
若所述比值大于0.25或小于0.1，则识别结论为指纹膜或指纹套一类的指纹载体，所述CPU控制器4通过信号传输线16授权报警装置12发出报警提示信息，提示当前身份验证信息错误。所述CPU控制器4具体控制流程图如图2所示。If the ratio is greater than 0.25 or less than 0.1, then the identification conclusion is a fingerprint carrier such as a fingerprint film or a fingerprint sleeve, and the CPU controller 4 authorizes the alarm device 12 to send an alarm prompt message through the signal transmission line 16, prompting that the current identity verification information is wrong . The specific control flowchart of the CPU controller 4 is shown in FIG. 2 .
优选地，所述紫外光源15由如下方法获得：Preferably, the ultraviolet light source 15 is obtained by the following method:
由紫外光源1发射出原始紫外光14；The original ultraviolet light 14 is emitted by the ultraviolet light source 1;
将所述原始紫外光14通过聚光透镜17获得平行紫外光18；Pass the original ultraviolet light 14 through a condenser lens 17 to obtain parallel ultraviolet light 18;
将平行紫外光18通过紫外带通滤光片2，获得波长范围仅连续覆盖0.33～0.4μm的紫外光组成的紫外光源15。Pass the parallel ultraviolet light 18 through the ultraviolet band-pass filter 2 to obtain an ultraviolet light source 15 composed of ultraviolet light whose wavelength range only continuously covers 0.33-0.4 μm.
以上实施方式仅用于说明本发明，而非对本发明的限制。尽管参照实施例对本发明进行了详细说明，本领域的普通技术人员应当理解，对本发明的技术方案进行各种组合、修改或者等同替换，都不脱离本发明技术方案的精神和范围，均应涵盖在本发明的权利要求范围当中。The above embodiments are only used to illustrate the present invention, but not to limit the present invention. Although the present invention has been described in detail with reference to the embodiments, those skilled in the art should understand that various combinations, modifications or equivalent replacements of the technical solutions of the present invention do not depart from the spirit and scope of the technical solutions of the present invention, and all should cover Within the scope of the claims of the present invention.
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| WO2021237524A1 (en) * | 2020-05-27 | 2021-12-02 | 深圳市汇顶科技股份有限公司 | Fingerprint recognition apparatus and electronic device |
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