HK1117622B - Authentication device, registration method, correlation method - Google Patents
Authentication device, registration method, correlation method Download PDFInfo
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- HK1117622B HK1117622B HK08108119.1A HK08108119A HK1117622B HK 1117622 B HK1117622 B HK 1117622B HK 08108119 A HK08108119 A HK 08108119A HK 1117622 B HK1117622 B HK 1117622B
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Description
Technical Field
The present invention relates to an authentication device, a registration method, a verification method, and a program which are intended to be used when a blood vessel is authenticated as an authentication target.
Background
In the past, blood vessels were used as objects to be authenticated for biometric authentication. Generally, in an authentication apparatus, a finger is placed at a predetermined position, and an image of a blood vessel in a stationary finger is taken. Then, the authentication apparatus registers a blood vessel image obtained as a result of capturing an image in a memory or the like as information for identifying a living body having the blood vessel, or compares the image with an already registered blood vessel image to determine whether or not a person of the blood vessel is the same registrant (for example, refer to patent document 1).
[ patent document 1]
Japanese patent laid-open publication No. 2003-30632.
Disclosure of Invention
In such an authentication apparatus, at the time of authentication, even in a case where a finger is placed at a predetermined position in a slightly different state from that at the time of registration, as shown in fig. 9, since the image pickup direction is different, the curvature changes even if the finger is the same finger. Therefore, a problem arises in that: even if the person is the same registrant, it is determined to be a third person, thereby degrading authentication accuracy.
In view of the above-described drawbacks, the present invention provides an authentication apparatus and an authentication method that can improve authentication accuracy.
In order to solve the above problem, according to the present invention, there is provided an authentication apparatus comprising: compensation means for compensating a plurality of images obtained by sequentially and continuously capturing biological authentication objects of a predetermined biological site from different directions so that the plurality of images obtained as a result of continuous image capturing correspond to a surface profile of the biological site; a pasting means for pasting each image compensated by the compensation means with a point on the biometric authentication object in the image as a reference; and a collating device for collating the set of images pasted by the pasting device with an image to be collated obtained by taking an image from an arbitrary direction.
According to the authentication apparatus, since a stereoscopic image substantially the same as an actual biometric authentication object can be obtained by the compensation means and the attaching means, even if an image is taken from any direction at the time of collation, collation with an image to be collated can be completed by the collation means in consideration of a change in curvature of the biometric authentication object, so that a decrease in authentication accuracy due to the change in curvature can be prevented.
According to the present invention, there is also provided a registration method, including: a first step of compensating a plurality of images obtained by sequentially and continuously capturing a biometric authentication object of a predetermined biological site from different directions so that the plurality of images obtained as a result of continuous image capturing correspond to a surface profile of the biological site; a second step of bonding the compensated images with reference to a point on the biometric authentication object in the image; and a third step of registering the pasted set of images in a storage medium as information to be collated with an image to be collated obtained by taking an image from an arbitrary direction.
According to this registration method, since a stereoscopic image substantially the same as an actual biometric authentication object can be obtained by the first step and the second step, even if an image is taken from any direction at the time of collation, collation with an image to be collated can be completed in consideration of a change in curvature of the biometric authentication object, so that a decrease in authentication accuracy due to the change in curvature can be prevented.
According to the present invention, there is also provided a collation method comprising: a first step of reading registration information from a storage medium in which a biometric authentication object of a predetermined biometric region is continuously captured in order from different directions, and a plurality of images obtained as a result of the continuous imaging are compensated so that the plurality of images correspond to a surface contour of the biometric region, and the respective compensated images are attached with reference to a point on the biometric authentication object in the images so as to be registered as the registration information; a second step of reconstructing the respective images to be attached to each other with reference to a point on the biometric authentication object based on the registration information; and a third step of collating each image thus reconstructed with an image to be collated obtained by imaging from an arbitrary direction.
According to this collation method, since the stereoscopic image group substantially identical to the actual biometric authentication object can be obtained from the recording medium by the first step and the second step, even if the image to be collated is captured from any direction, the image to be collated can be collated with the stereoscopic image group in consideration of the change in curvature of the biometric authentication object, so that the degradation of the authentication accuracy due to the change in curvature can be prevented.
According to the present invention, there is also provided a program for causing an apparatus to execute a process to which a continuous imaging result of a biometric authentication object that continuously images a predetermined biometric part from different directions in order is input, characterized by comprising: a first process of compensating a plurality of images obtained by sequentially and continuously capturing a biometric authentication object of a predetermined biological site from different directions so that the plurality of images obtained as a result of continuous imaging correspond to a surface profile of the biological site; a second process of attaching each of the compensated images with reference to a point on the biometric authentication object in the image; and a third process of registering the pasted set of images in the storage medium as information to be collated with an image to be collated obtained by capturing an image from an arbitrary direction.
According to this program, since a stereoscopic image substantially the same as an actual biometric authentication object can be obtained by the first processing and the second processing, even if an image is taken from any direction at the time of collation, collation with an image to be collated can be performed in consideration of a change in curvature of the biometric authentication object, so that a decrease in authentication accuracy due to the change in curvature can be prevented.
According to the present invention, there is also provided a program for causing an apparatus to execute the following processing, characterized by comprising: a first process of reading out registration information from a storage medium, in which a biometric authentication object of a predetermined biometric region is successively captured from different directions in order, and a plurality of images obtained as a result of the successive capturing are compensated so that the plurality of images correspond to a surface profile of the biometric region, and each compensated image is attached with reference to a point on the biometric authentication object in the image so as to be registered as the registration information; second processing for reconstructing each image to be attached with reference to a point on the biometric authentication object based on the registration information; and a third process of collating each image thus reconstructed with an image to be collated obtained by imaging from an arbitrary direction.
According to this program, since the stereoscopic image group substantially identical to the actual biometric authentication object can be obtained from the recording medium by the first processing and the second processing, even if an image to be collated is captured from any direction, the image to be collated can be collated with the stereoscopic image group in consideration of a change in curvature of the biometric authentication object, so that a decrease in authentication accuracy due to the change in curvature can be prevented.
According to the present invention, by compensating a plurality of images obtained by successively photographing a biometric authentication object of a predetermined biometric region from different directions in order so that the plurality of images obtained as a result of the successive photographing correspond to the surface shape of the biometric region, and pasting the respective compensated images with reference to a point on the biometric authentication object in the images, and collating the pasted set of images with an image to be collated obtained by photographing the images from an arbitrary direction, since a stereoscopic image substantially identical to an actual biometric authentication object can be obtained, even if the images are photographed from any direction at the time of collation, the image to be collated can be collated in consideration of a change in curvature of the biometric authentication object, which can achieve an improvement in authentication accuracy.
Drawings
Fig. 1 is a block diagram showing the overall structure of an authentication apparatus according to the embodiment.
Fig. 2 is a schematic diagram for explaining capturing an image of a finger.
Fig. 3 is a schematic diagram for explaining the relationship between the imaging direction and the blood vessel image.
Fig. 4 is a block diagram showing the structure of an image processing unit.
Fig. 5 is a schematic diagram for explaining mapping of a plurality of binary blood vessel images.
Fig. 6 is a diagram for explaining curve approximation.
Fig. 7 is a schematic view for explaining the verification of the blood vessel line.
Fig. 8 is a diagram for explaining mapping of a binary blood vessel image.
Fig. 9 is a schematic diagram for explaining a change in curvature of a blood vessel due to the imaging direction.
Detailed Description
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
(1) Integral structure of authentication device
In fig. 1, reference numeral "1" denotes an authentication apparatus according to an embodiment of the present invention, and the operation unit 3, the storage medium unit 4, the display unit 5, the camera unit 6, the image processing unit 7, and the authentication unit 8 are connected to the control unit 2 that controls the entire authentication apparatus 1 through the bus 9.
The control unit 2 is a computer structure including a CPU (central processing unit) that controls the entire authentication apparatus 1, a ROM (read only memory) that stores various programs, and a RAM (random access memory) that is a work memory of the CPU, and an execution command COM 1 of a mode (hereinafter, blood vessel registration mode) of registering a blood vessel of a registrant or an execution command COM 2 of a mode (hereinafter, authentication mode) for determining whether the same registrant exists is supplied to the control unit 2 in accordance with the operation of the operation unit 3.
Upon receiving an execution command COM 1 for the blood vessel registration mode from the operation unit 3, the control unit 2 sets the operation mode to the blood vessel registration mode and controls the camera unit 6 and the image processing unit 7, and arbitrarily displays control contents and the like to the display unit 5, based on a corresponding program stored in the ROM.
In this case, the camera unit 6 guides the imaging light on which the blood vessels present in the finger are projected to the imaging surface of the imaging element through the optical system, and outputs a blood vessel image formed on the imaging surface from the imaging element as an image signal BSX (hereinafter referred to as a blood vessel image signal).
The image processing unit 7 detects blood vessels of the blood vessel image as a set of points based on the blood vessel image signal BSX sequentially output from the camera unit 6, and transmits the set of points as blood vessel formation pattern data PD to the control unit 2.
When receiving the blood vessel formation pattern data PD, the control unit 2 registers the data by arranging (string) the data in the storage medium unit 4, and stops controlling the camera unit 6 and the image processing unit 7, respectively, and sets the operation mode from the blood vessel registration mode to the stop mode.
On the other hand, in the case of receiving the execution command COM 2 for the authentication mode from the operation unit 3, based on the corresponding program stored in the ROM, the control unit 2 sets the operation mode to the authentication mode and reads out the blood vessel formation pattern data registered in the storage medium unit 4, thereby transmitting the read-out data to the authentication unit 8, and the control unit 2 controls the camera unit 6, the image processing unit 7, and the authentication unit 8. Further, the control unit 2 arbitrarily displays control contents and the like on the display unit 5.
In this case, similarly to the blood vessel registration mode, the camera unit 6 outputs imaging light projected with a blood vessel existing in the finger as a blood vessel image signal BSY, and the image processing unit 7 performs various kinds of preprocessing on the blood vessel image signal BSY to express the blood vessel as a binary line, and transmits the processed blood vessel image as data BD (hereinafter referred to as blood vessel image data) to the authentication unit 8.
The authentication unit 8 reconstructs a blood vessel from the set of points indicated in the blood vessel formation pattern data PD read out from the storage medium unit 4. Then, the authentication unit 8 checks the reconstructed blood vessel against the blood vessel indicated in the blood vessel image data BD transmitted from the image processing unit 7, and determines whether or not the user who captured the finger image with the camera unit 6 is a registrant based on the result of the check.
Then, the authentication unit 8 generates data CD (hereinafter referred to as authentication data) indicating whether the user is a registrant or a third person based on the determination result, and transmits the data to the control unit 2.
When receiving the authentication data CD, the control unit 2 transmits the data to an external device connected to the authentication apparatus 1, and stops controlling the camera unit 6, the image processing unit 7, and the authentication unit 8, and sets the operation mode from the authentication mode to the stop mode.
In this way, compared with the case where a fingerprint or the like existing on the surface of a living body is used as an authentication object, by performing biometric authentication using a blood vessel as a unique structural object existing in the living body as an object to be authenticated to judge the presence of the same person (registrant), not only direct theft from the living body but also impersonation of the registrant by a third person can be prevented.
(2) Method for registering blood vessel
In addition to the above-described structure, in the authentication apparatus 1, a blood vessel registration method is also employed in which a plurality of blood vessel images continuously taken from different directions in order are overlapped, and blood vessels of the overlapped blood vessel images (hereinafter referred to as an overlapped blood vessel image group) are registered as a set of points of a curve.
Actually, in the authentication apparatus 1, the blood vessels to be authenticated are continuously photographed from different directions along the curve of the finger pad surface, and in the present embodiment, as shown in fig. 2, the finger rotated at a predetermined position along the curve of the finger pad surface is continuously photographed with the camera unit 6 within the image capturing range of the camera unit 6.
Therefore, the blood vessel image signals BSX are sequentially output based on a plurality of blood vessel image signals BSX as a result of continuous imagingiOn each blood vessel image of (i ═ 1, 2, 3.., n (n is an integer)), for example, as shown in fig. 3, blood vessels to be authenticated may be successively photographed from different directions, respectively, along the curve of the finger pad surface.
As shown in fig. 4, the image processing unit 7 is constituted by a preprocessing unit 10, an image compensation unit 11, and a pattern generation unit 12. The preprocessing unit 10 sequentially outputs the blood vessel image signals BSX in a predetermined order from the camera unit 6i(i ═ 1, 2, 3..) various filtering processes corresponding to noise component removal, contour enhancement, and blood vessel linearization and binarization processes and the like are performed, and blood vessel image data BD representing a linearized blood vessel (hereinafter referred to as a blood vessel line) as a blood vessel image of binary data (hereinafter referred to as a binary blood vessel image) is sequentially generatedi. Then, the pretreatment unit 10 willBlood vessel image data BDiIn order to the image compensation unit 11.
The image compensation unit 11 compensates a plurality of blood vessel images photographed as planes so as to draw a curvature corresponding to the finger pad surface (hereinafter referred to as curvature compensation), and superimposes the respective blood vessel images subjected to the curvature compensation to generate a superimposed blood vessel image group.
Specifically, for example, as shown in fig. 5, the image compensation unit 11 performs curvature compensation so that it is based on the blood vessel image data BD supplied from the preprocessing unit 10iEach binary blood vessel image IMiIs fitted to the circumferential surface of a body CO in the form of a cylinder (hereinafter referred to as a cylinder) represented as profile data held in advance in the control unit 2. Therefore, the image compensation unit 11 can eliminate the binary blood vessel image IM caused when the image of the blood vessel existing in the stereoscopic finger is photographed as a planeiThe projection distortion that occurs in (1).
Binary blood vessel image IM on which curvature compensation is performed is changed according to rotation of fingeriWithout changing the relative positions of the end points of the blood vessel line and the points of the branch point (hereinafter referred to as blood vessel characteristic points).
Therefore, the image compensation unit 11 detects each of the binary blood vessel images IM subjected to the warp compensationiAnd each of a terminal point and a branch point (hereinafter referred to as a blood vessel feature point) on the blood vessel line in (1), and the binary blood vessel image IM is superimposediThe blood vessel lines of the same curvature are made to overlap with the blood vessel feature points as the reference to generate an overlapped blood vessel image group SIM.
In this way, the binary blood vessel image IM is simply superimposediBy superimposing the binary blood vessel image IM from which the projection distortion is removed by the warp compensationiThe image compensation unit 11 can avoid abnormality of the connection point between the blood vessel lines of the same curvature and the blood vessel lines of different curvatures, and thus can generate the blood vessel having a shape with multiple directions in a state of approximating the actual blood vesselAnd an overlapped blood vessel image group SIM composed of the blood vessel lines of the curvature of the photographed blood vessel.
On the other hand, the pattern generating unit 12 approximates the blood vessel lines in the overlapped blood vessel image group SIM using a curve, and generates an aggregate of a plurality of points on the curve thus approximated as the blood vessel formation pattern data PD.
Specifically, for a plurality of blood vessel feature points on the blood vessel line, every two adjacent blood vessel feature points, for example, as shown in fig. 6, by connecting two blood vessel feature points P1And P2The midpoint of the line of (a) is set as a positioning point AP, and the pattern generation unit 12 shifts the positioning point AP to be closest to the blood vessel feature point P1And P2The position of the blood vessel line in between, thereby performing curve approximation.
Then, the pattern generation unit 12 generates each blood vessel feature point P in the overlapped blood vessel image group SIMk(k 2, 3.. said., m ("m" is an integer)) and a location point AP between the vessel feature pointsk-1As blood vessel formation pattern data PD, and is registered in the storage medium unit 4 (fig. 1) by the control unit 2 (fig. 1).
In this way, since the authentication apparatus 1 attaches the blood vessel image photographed as a plane to the stereoscopic subject and generates the blood vessel in the overlapped blood vessel image group attached to the stereoscopic subject as a set of points of a curve, it is possible to register, as the blood vessel formation pattern data PD, points on the blood vessel generated by the actual blood vessel existing approximately stereoscopically in the finger.
(3) Authentication method
Next, an authentication method using the overlapped blood vessel image group will be explained.
In the present embodiment, at the time of authentication, unlike at the time of registration, the authentication apparatus 1 captures an image of a finger whose arbitrary finger pad surface is placed at a predetermined position within the imaging range of the camera unit 6 using the camera unit 6, and performs various kinds of processing on the blood vessel image signal BSY (fig. 4) obtained as the imaging result in the preprocessing unit 10 (fig. 4) of the image processing unit 7, and transmits the blood vessel image data BD (fig. 4) representing a binary blood vessel image obtained as the processing result to the authentication unit 8.
The authentication unit 8 is based on each blood vessel feature point P indicated in the blood vessel formation pattern data PD read out from the storage medium unit 4kAnd anchor point APk-1The overlapped blood vessel image group SIM (fig. 5) is reconstructed, and the blood vessel line is collated between the overlapped blood vessel image group SIM and the binary blood vessel image represented in the blood vessel image data BD supplied from the preprocessing unit 10.
Specifically, for example, as shown in fig. 7, as an area where no projection distortion occurs based on the imaging conditions or the like, an area of a predetermined range with the center of the image as a reference (hereinafter referred to as an image center area) AR is set in advance, and the authentication unit 8 acquires a correlation value between the overlapped blood vessel image group SIM and the binary blood vessel image BIM with respect to the image center area AR, and detects a position where the correlation value of the overlapped blood vessel image group SIM with respect to the binary blood vessel image BIM is maximum.
Thereby, the authentication unit 8 can specify a position corresponding to a direction in which the binary blood vessel image BIM is taken without being affected by projection distortion occurring in the binary blood vessel image BIM due to taking an image of a blood vessel existing stereoscopically inside a finger as a plane.
Then, as shown in fig. 8, the authentication unit 8 overlaps the binary blood vessel image BIM on which the curvature compensation is performed, thereby attaching the binary blood vessel image BIM to the circumferential surface of the cylindrical body CO similarly as at the time of registration on the overlapped blood vessel image group SIM, thereby overlapping the blood vessel lines of the same curvature.
Thus, the authentication unit 8 can set the binary blood vessel image BIM to the same state at the time of registration without forcing the user to take an image of the finger pad surface in the same direction as at the time of registration.
In this state, the authentication unit 8 obtains a correlation value between the binary blood vessel image BIM and the corresponding overlapped blood vessel image group SIM, and generates authentication data CD according to whether the correlation value is equal to or greater than a minimum value for determining that the person is a registrant (hereinafter referred to as a registrant determination threshold value), and transmits the data to the control unit 2.
In this way, the authentication apparatus 1 uses not only the overlapped blood vessel image group SIM as an object to be authenticated but also as a parameter for compensating for curvature due to a difference in imaging direction in the binary blood vessel image BIM, which is based on the blood vessel image signal BSX obtained by continuously capturing images of the blood vessel to be authenticated from different directionsiCompared with the case where all the images of (fig. 4) are registered as the objects to be collated, the storage capacity of the storage medium unit 4 and the processing load in the authentication unit 8 can be reduced to improve the authentication accuracy.
(4) Operation and effects
In the above-described configuration, in the authentication apparatus 1, the binary blood vessel image IM obtained as a result of the continuous imaging is taken with reference to the blood vessel feature points on the blood vessel line in the image by continuously taking images of the blood vessel of the finger from different directions in orderi(fig. 5) is mapped to the cylinder CO (fig. 5) such that the portions of the vessel lines that overlap are overlapped to generate an overlapped vessel image set SIM (fig. 5).
Thereby, the authentication apparatus 1 can generate the stereoscopic overlapped blood vessel image group SIM substantially the same as the actual blood vessel.
Thereby, the binary blood vessel image BIM to be collated obtained after the image pickup result and the binary blood vessel image IM of the overlapped blood vessel image group SIM are combinediIn the case of the collation, even if the binary blood vessel image BIM is photographed from any direction, the authentication apparatus 1 can collate with the binary blood vessel image BIM of the overlapped blood vessel image group SIM corresponding to the direction.
Thus, without forcing the user to take an image of the surface of the finger pad so that the image pickup direction is exactly the same as that at the time of registration, the authentication apparatus 1 can perform collation in consideration of the change in curvature of the blood vessel corresponding to the image pickup direction at the time of collation, so that collation of the blood vessel line with high accuracy can be continuously realized.
Further, the authentication apparatus 1 approximates the blood vessel lines of the overlapped blood vessel image group SIM with a curve, and stores a set of a plurality of points of the curve thus approximated in the storage medium unit 4 as the blood vessel formation pattern data PD, and reads out the blood vessel formation pattern data PD from the storage medium unit 4 at the time of verification to reconstruct the overlapped blood vessel image group SIM.
Thereby, the authentication apparatus 1 can not only significantly reduce the storage occupation area of the storage medium unit 4 by the overlapped blood vessel image group SIM, but also maintain and check substantially the same state as the blood vessel as the actual smooth curve, which can realize the check of the blood vessel line with high accuracy.
According to the above configuration, the binary blood vessel image IM obtained as a result of continuous imaging from different directions in order is obtained by using the blood vessel feature point on the blood vessel line in the image as a referenceiSequentially mapped to the cylinder CO (FIG. 5), and each of the mapped binary blood vessel images IMiBy checking with the binary blood vessel image BIM obtained as a result of imaging from an arbitrary direction, a stereoscopic image substantially the same as an actual biometric authentication object can be obtained. Therefore, even if an image is taken from any direction at the time of collation, an image to be collated can be collated in consideration of a change in curvature of a blood vessel, which can achieve an improvement in authentication accuracy.
(5) Other embodiments
In the above-described embodiment, the blood vessel of the finger is employed as the biometric authentication object of the predetermined biometric part, the present invention is not limited to this, and other biometric authentication objects of various biometric parts may be employed, such as: blood vessels of the eyes, legs or palms, skin lines of the fingers, legs or palms, lip lines of the mouth.
Further, in the above-described embodiment, as a method of generating a body corresponding to the surface contour of a biological site, the contour data representing the body (cylinder CO (fig. 5)) in the form of a cylinder corresponding to the finger pad surface of a finger is stored in advance and the contour data is read out, but the present invention is not limited to this, and a configuration may be adopted in which data representing the radius of the cylinder is stored in advance and the cylinder CO is generated based on the data at each registration. In the above-described configuration, although the thickness of the blood vessel existing in the finger is not taken into consideration, the thickness can be taken into consideration by moving the focal position at predetermined intervals in the thickness direction and employing a method of forming the overlapped blood vessel image group for the moved focal position.
Further, as the outer shape, in the above-described embodiment, although the cylindrical shape is employed, other various outer shapes corresponding to the surface outer shape of the biological site may be employed, for example: an elliptic cylinder or a spherical surface.
Further, in the above-described embodiment, as a method of continuously photographing a biometric authentication object of a biometric part from different directions in order, the case of continuously photographing a finger rotating along the curve of the finger pad surface has been described, but the present invention is not limited thereto, and also includes the case of continuously photographing a stationary finger by rotating the camera unit 6 along the curve of the finger pad surface of the finger.
Further, in the above-described embodiment, as the collation means for collating the image group collated by the collation means and the image to be collated obtained by capturing the image from an arbitrary direction, in the case of detecting an image portion of the overlapped blood vessel image group SIM which is the largest with respect to the correlation value of the image center area AR (fig. 7) and the binary blood vessel image BIM, and after mapping the binary blood vessel image BIM to this detected image portion (fig. 8), collating the blood vessel lines between the binary blood vessel image BIM and the corresponding overlapped blood vessel image group SIM is explained, the present invention is not limited to this, and a configuration may be adopted in which: by peeling off a binary blood vessel image corresponding to an image portion of the detected overlapped blood vessel image group SIM from the cylinder CO, a binary blood vessel image representing the image portion as a plane is generated, and blood vessel lines between the binary blood vessel image and the binary blood vessel image BIM are collated.
In this case, the curvature of the blood vessel line in the binary blood vessel image as a plane peeled off from the cylinder CO is compensated under the same condition as the binary blood vessel image BIM taken from the same image pickup direction, which can bring about the same effect as in the above-described embodiment.
Further, as another method, for example, such a configuration may be adopted: by mapping the binary blood vessel image BIM to the overlapped blood vessel image group SIM (cylinder CO), the blood vessel lines between the mapped binary blood vessel image BIM and the overlapped blood vessel image group SIM are collated, thereby rotating the overlapped blood vessel image group SIM.
In the case of this method, although the processing load is large, the binary blood vessel image BIM and the overlapped blood vessel image group SIM are directly collated, and therefore, the authentication accuracy is improved.
Further, in the above-described embodiment, as the holding means for holding the biometric authentication object in the image group pasted by the pasting means as the set of points of the curve, the storage medium unit 4 in the authentication apparatus 1 is employed, to which the present invention is not limited, and a storage medium external to the authentication apparatus 1 may be employed, or a recording medium that can be arbitrarily connected to the authentication apparatus 1 may be employed.
Further, as a method of setting the biometric authentication object as the set of points of the curve, for example, other various curve functions, Bezier curve (Bezier) functions, B-spline functions, and the like can be employed.
Further, in the above-described embodiment, the first function of generating the overlapped blood vessel image group SIM and registering the group in the storage medium unit 4, and the second function of collating the overlapped blood vessel image group SIM with the binary blood vessel image BIM to be collated are loaded in the single authentication apparatus 1, the present invention is not limited thereto, and the authentication apparatus 1 may be divided into an apparatus loading the first function and an apparatus loading the second function according to the authentication use application or the like.
Further, in the above-described embodiments, the stereoscopic blood vessel registration method in the image processing unit 7 and the authentication method in the authentication unit 8 are realized by hardware, to which the present invention is not limited, and these methods may be realized by software using a program that causes a computer device to execute the methods.
Industrial applications
The present invention can be used when authenticating a feature of a blood vessel of a living body as an object to be authenticated.
Claims (8)
1. An authentication apparatus characterized by comprising:
compensation means for performing curvature compensation on a plurality of images obtained by sequentially and continuously capturing biological authentication objects of a predetermined biological site from different directions so that the plurality of images obtained as a result of continuous imaging correspond to a surface profile of the biological site;
attaching means for attaching each image compensated by the compensation means to a subject corresponding to a surface profile of a predetermined biological site with reference to a feature point on a biometric authentication target in the image; and
a collating device for collating a set of images pasted by the pasting device with an image to be collated obtained by capturing images from an arbitrary direction.
2. The authentication device according to claim 1, characterized in that:
the biological site is a finger, an
The compensation means performs the curvature compensation so as to correspond to the surface profile of the finger.
3. The authentication device according to claim 1, characterized in that: the attaching device attaches the images compensated by the compensation device so that the same portions of the biometric authentication objects in the images are overlapped.
4. The authentication device according to claim 1, characterized in that: the biometric authentication object is a blood vessel.
5. The authentication apparatus according to claim 1, wherein the collating means includes:
a first collating means that collates a set of images pasted by the pasting means with an image to be collated obtained by photographing an image from an arbitrary direction with respect to an area of a predetermined range with reference to the center of the image, and
and a second collating means for collating an image closest to the image to be collated among the group of images as a result of the collation by the first collating means with the image to be collated compensated so as to correspond to the surface contour of the biological part.
6. The authentication apparatus according to claim 1, characterized by further comprising:
holding means for holding the biometric authentication object in the set of images pasted by the pasting means as a set of points of a curve; and
reconstruction means for reconstructing the set of images from the set of points held by the holding means;
wherein the collating means collates the group of images reconstructed by the reconstructing means with an image to be collated obtained by capturing images from an arbitrary direction.
7. A registration method, comprising:
a first step of performing curvature compensation on a plurality of images obtained by sequentially and continuously capturing a biometric authentication object of a predetermined biological site from different directions so that the plurality of images obtained as a result of continuous imaging correspond to a surface profile of the biological site;
a second step of attaching each of the compensated images to a main body corresponding to a surface contour of a predetermined biological site with reference to a feature point on the biometric authentication object in the image; and
and a third step of registering the pasted group of images in a storage medium as information to be collated with an image to be collated obtained by capturing an image from an arbitrary direction.
8. A collation method characterized by comprising:
a first step of reading out registration information from a storage medium in which a biometric authentication object of a predetermined biometric part is continuously captured from different directions in order, and a plurality of images obtained as a result of the continuous imaging are subjected to curvature compensation so that the plurality of images correspond to a surface contour of the biometric part, and each compensated image is pasted onto a body corresponding to the surface contour of the predetermined biometric part with reference to a feature point on the biometric authentication object in the image so as to be registered as the registration information;
a second step of reconstructing the respective images to be attached with reference to the feature points on the biometric authentication object based on the registration information; and
a third step of collating each image thus reconstructed with an image to be collated obtained by imaging from an arbitrary direction.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP134149/2005 | 2005-05-02 | ||
| JP2005134149A JP4671027B2 (en) | 2005-05-02 | 2005-05-02 | Authentication apparatus, authentication method, and program |
| PCT/JP2006/309440 WO2006118354A1 (en) | 2005-05-02 | 2006-05-01 | Authentication device, registration method, correlation method, and program |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| HK1117622A1 HK1117622A1 (en) | 2009-01-16 |
| HK1117622B true HK1117622B (en) | 2012-12-14 |
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