JP2006277730A - Personal identification apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a personal identification apparatus allowing a person to be identified to easily and surely guide his or her face to be imaged or a part of the face in a focusing range of an imaging means. <P>SOLUTION: This personal identification apparatus is provided with a recognition unit 25 which allows the person to be identified to recognize whether the iris of an eye is located in the focusing range of the imaging means. The recognition means 25 is composed of a point light source 27, and two light-shielding parts 28, 28 which are arranged between the point light source 27 and the person to be identified to make the point light source 27 invisible from the person to be identified only when both eyes of the person to be identified are located in the focusing range (Y position) of the imaging means or visible in other positions X and Z. R<SB>1</SB>is an illumination area of the point light source 27; R<SB>2</SB>is a non-illumination area of the point light source 27; and W is a proper iris area. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a personal identification device that identifies a person to be identified using a face or a part of the face of the person to be identified.

  2. Description of the Related Art In recent years, various types of personal identification devices have been developed for identifying individuals using an image pattern of the face, retina, or iris (iris) in addition to the fingerprint of the person to be identified (for example, Patent Documents 1 to 4). reference). In particular, the iris of the human eye is a muscular part that adjusts the degree of opening of the pupil, and since the pattern has a pattern unique to each individual like the fingerprint, counterfeiting is virtually impossible and the recognition accuracy is higher than the fingerprint. In recent years, an iris personal identification device has been put to practical use because it has a merit that it can be distinguished without contact.

  Such an individual identification device using an iris includes an imaging unit (for example, a camera or a video camera) that captures an iris and inputs the image data, and a collation determination unit that processes an output from the imaging unit. ing. The collation determination unit collates the registered pattern (reference pattern) photographed by the imaging unit during registration with the collation pattern (input pattern) photographed by the imaging unit during collation based on a predetermined collation algorithm, and outputs the result.

  In order to increase the collation accuracy of the personal identification device, it is important to photograph the registered pattern and the collation pattern under the same conditions by the imaging unit. For that purpose, it is ideal that the person to be identified is in the same position as that at the time of registration and verification with respect to the imaging means.

  For this reason, in the personal identification device described in Patent Document 1, a distance between the identified person and the video camera is calculated in conjunction with the zoom mechanism, and light having an intensity corresponding to the distance is calculated by the identified person. The eye is irradiated and the iris is imaged with a video camera.

  The iris image input device described in Patent Document 2 includes a stereoscopic display for displaying a three-dimensional image and a three-dimensional object generation unit as means for guiding the identified person's iris to an optimum position. The three-dimensional object generation means generates and displays a background object and an optimal position object, generates an eye position object based on the eye position of the identified person, and displays it on the stereoscopic display.

  The iris is guided to the optimum position by moving the eyeball of the identified person so that the eye position object displayed on the display screen of the stereoscopic display coincides with the center of the optimum position object. Whether or not the eye position object matches the optimal position object is checked by the judging means. The judging means sends out an extraction instruction signal when the eye position object and the optimum position object coincide with each other, and the iris pattern extraction means extracts the iris patterns of both eyes based on the extraction instruction signal.

JP-A-10-137220 JP 2001-215109 A Japanese Patent Publication No. 5-84166 JP-A-7-115572

  However, the personal identification device disclosed in Patent Document 1 described above has a problem that the device itself is expensive because it requires a distance calculation unit, a zoom mechanism, and the like for calculating the distance between the person to be identified and the video camera. It was.

  The iris image input device disclosed in Patent Document 2 also requires a stereoscopic display for displaying a three-dimensional image and a three-dimensional object generation means, and thus the device itself is also expensive and large.

  The present invention has been made in order to solve the above-described conventional problems. The object of the present invention is to use a simple structure and inexpensive recognition means, so that the person to be identified is the face to be imaged or An object of the present invention is to provide a personal identification device capable of guiding a part of a face easily and surely within a focusing range of an imaging means.

  In order to achieve the above object, according to a first aspect of the present invention, an image of a face or a part of a face of a person to be identified is picked up by an image pickup means, and image information of the face or part of a face of a person registered in advance is recorded. In the personal identification device for identifying whether or not the person to be identified is the person by collating by means of collation determination means, the face or part of the face is located within the focusing range of the imaging means A recognition means for visually recognizing the person to be identified, the recognition means being disposed between the point light source and the point light source and the person to be identified, and the face or a part of the face is in a focusing range of the imaging means. The point light source is made invisible or visible from the person to be identified only when it is located inside, and is made up of a light shielding member that makes it visible or invisible at the other positions.

  According to a second aspect of the present invention, the light shielding member makes the point light source invisible to the identified person only when a part of the face is located within the in-focus range of the imaging means, and on the other hand, the light is not visible. It has two light-shielding parts that can be made.

  According to a third aspect of the present invention, the point light source can be viewed from the person to be identified only when the light shielding member has a part of the face located within the focusing range of the imaging unit, and the other part is visually It has two translucent parts to be disabled.

  A fourth invention includes a main body case and a movable case provided on the upper portion of the main body case so as to be capable of angle adjustment in the front-rear direction, and the imaging means, the point light source, and the light shielding member are incorporated in the movable case. It is what has been.

  The fifth invention includes a mirror that captures both eyes of the person to be identified.

  The sixth invention further comprises a capture button operated by the identified person when at least a part of the face of the identified person is within the focusing range of the imaging means, and the capture button is operated A part of the face of the person to be identified is imaged by the imaging means.

  In the first invention, the light shielding member makes the point light source visible or invisible depending on the position of the person to be identified.

In the second invention provided with a light shielding member having two light shielding parts, when the identified person moves the face back and forth with the point light source viewed from the front, the point light source is hidden behind the light shielding part and is not visible. The person to be identified can recognize that the face or part of the face is located within the focusing range with respect to the imaging means.
On the other hand, when the face of the person to be identified or a part of the face is far from the in-focus range, a point light source can be seen between the two light shielding parts, and if it is too close to the point light source, the point light source can be seen outside the light shielding part. Therefore, it is possible to make the identified person recognize that it is out of the focus range.

In the third invention provided with the light shielding member having two light-transmitting portions, the point light source can be seen through the light-transmitting portion by moving the face back and forth with the person to be identified looking at the point light source. Thus, the person to be identified can recognize that the face or a part of the face is located within the focusing range with respect to the imaging means.
On the other hand, when the face of the person to be identified or a part of the face is far from the in-focus range, the point light source cannot be seen hidden behind the light shielding part between the two translucent parts, and too close to the point light source Since the point light source is hidden behind the light-shielding portion outside the two light-transmitting portions and cannot be seen, the person to be identified can be recognized to be out of the focusing range.

  In 4th invention, an imaging means can be directly opposed with respect to a to-be-identified person's face by rotating a movable case to the front-back direction.

  In the fifth invention, the mirror recognizes whether or not both eyes of the person to be identified are in the optimum position. The person to be identified moves his / her face up / down / left / right so that both eyes are properly reflected on the mirror, and recognizes that the position adjustment in the up / down / left / right direction has been appropriately performed. The mirror may be either a total reflection mirror or a half mirror.

  In the sixth invention, when the capture button is operated, the imaging means images a part of the face of the person to be identified.

Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.
1 is an exploded perspective view of a personal identification device according to a first embodiment of the present invention, FIG. 2 is a front view of the device, FIG. 3 is a side view of the device, and FIG. 4 is a rear view of a transparent plate. 5 is a diagram for explaining the state of the person being imaged, FIG. 6 is a diagram for explaining the difference in appearance of the point light source by the light-shielding part, and FIG. 7 is a diagram showing the relationship between the focusing range and the appropriate iris region, FIG. 8 is a block diagram of a main part of the personal identification device. In the present embodiment, as an object to be collated, an example is applied to a personal identification device that images the iris of the eye of the person to be identified and collates and identifies the iris pattern and a previously registered registrant's iris pattern. Indicates.

  1 to 4, the personal identification device denoted as a whole by reference numeral 1 is manufactured on the assumption that the device is attached to a wall surface and is used in two cases arranged in the height direction, that is, A main body case 2, a movable case 3 provided on the main body case 2, a transparent plate 4 used as a light shielding member by covering a front surface of the movable case 3 and shielding a part thereof are provided.

  The main body case 2 is formed in a vertically long thin box shape, and houses a circuit board 5, a speaker 6 for voice guidance of a mode state at the time of iris collation, a CPU to be described later, and the like. In the circuit board 5, a known collation determining unit that collates a registered pattern taken at the time of registration and an iris pattern of the identified person imaged by the imaging unit at the time of collation based on a predetermined collation algorithm and outputs the result. (Collation determination circuit) is formed.

  The upper surface plate 8 of the main body case 2 is concavely curved with a radius R so that the front end side is lower than the rear end side, and the movable case 3 is pivotally supported above the upper surface plate 8 so as to be rotatable in the front-rear direction. The upper end portions of the pair of left and right support portions 7 and 7 project and project into the movable case 3. As shown in FIG. 3, the support portion 7 includes a leg portion 7A and a disc portion 7B provided integrally with the upper end of the leg portion 7A.

  Further, an intake button 10 is provided on one side surface of the main body case 2. This capture button 10 is operated by the identified person when the face of the identified person is located in the appropriate iris region W, and is provided in a range and position where the identified person can operate without moving the face. When the user operates the capture button 10, the imaging means 12 images a part of the face of the person to be identified.

  The movable case 3 constitutes a case that is long in the left-right direction and has a D-shaped side view. Therefore, the front surface of the movable case 3 is substantially vertical, and the back surface is curved in a convex shape with a radius substantially equal to the radius of curvature of the upper surface plate 8 of the main body case 2. Inside the movable case 3 are two image pickup means 12 and 12 for picking up the iris of the person to be identified and its illumination light source 13, a mode display light source 14 for color-displaying the mode state at the time of iris matching, and a circuit board 15. Etc. are incorporated.

  As shown in FIG. 3, a fan-shaped groove 16 into which the leg portion 7A of the support portion 7 is inserted and a circular shape in which the disc portion 7B is slidably fitted on the inner surfaces of the left and right side plates of the movable case 3. The concave portion 17 is formed, and the movable case 3 can be locked at an arbitrary angular position by the frictional force between the concave portion 17 and the disc portion 7B. The rotation angle of the movable case 3 is set to, for example, about 30 ° on the rear side and about 10 ° on the front side from the state in which the front plate 3A is vertical.

  As the imaging means 12, a CMOS type image sensor or a digital camera using a CCD as an image receiving element is used, and is mounted on the circuit board 15. The imaging means 12 is housed in a pair of left and right camera housing holes 19 formed in the front plate 3A of the movable case 3 in order to enable imaging of the iris of the identified person's eyes. A filter 20 is disposed on the front side. In FIG. 7, the focusing range of the imaging means 12 is about 3 to 4 cm.

  As the illumination light source 13 of the imaging means 12, for example, a near infrared LED is used. The number of illumination light sources 13 is arbitrary, but in this embodiment, four illumination light sources 13 are formed for each imaging means 12 and four illumination light source holes 21 are formed around each camera storage hole 19. The example which each accommodated is shown.

  As the mode display light source 14, an LED capable of switching the light emission color to seven colors is used and mounted on the circuit board 15. The mode display light source 14 is housed in a mode display hole 23 formed in the front plate 3A of the movable case 3 so as to be visible from the front. The mode display hole 23 is formed at the center in the left-right direction and at the top of the front plate 3A.

  Furthermore, the movable case 3 is provided with a recognition means 25 and a mirror 26 that allow the identified person to recognize whether or not the iris of the identified person's eye is within the focusing range of the imaging means 12.

  As shown in FIG. 6, the recognition means 25 includes a point light source 27 and two light-shielding portions 28 and 28 located on both sides of the point light source 27 in front of the point light source 27. An LED having a size of about 1 mm is used as the point light source 27 and is mounted on the circuit board 15. Further, the point light source 27 is arranged in a point light source hole 29 formed in the front plate 3 </ b> A of the movable case 3, so that it can be viewed from the front through the transparent plate 4. The point light source hole 29 is a long hole that is long in the left-right direction, and is formed below the mode display hole 23.

  The mirror 26 is used for guiding the person to be identified himself / herself to the positional deviation in the vertical and horizontal directions of both eyes of the person to be identified and guiding the face to an appropriate position. For this reason, the mirror 26 has such a length that both eyes can be seen when both eyes of the person to be identified are within the focusing range of the imaging means 12, and the left and right mirrors 26 are formed at the center of the front plate 3 </ b> A of the movable case 3. It is fitted and fixed in a mirror recess 32 that is long in the direction. The mirror recess 32 is formed below the point light source hole 29 and between the two camera storage holes 19, 19.

In FIG. 4, the transparent plate 4 is formed of acrylic resin or the like so as to be approximately the same size as the front surface of the movable case 3, and a light-shielding portion 34 is formed by applying a light-shielding paint 33, and other portions are shielded from light. Translucent portions A _{1 to} A ₅ are formed without being processed. These translucent portions A _{1 to} A ₅ include a camera housing hole 19, an illumination light source hole 21, a mode display hole 23, a point light source hole 29, and a mirror recess 32 formed on the front surface of the movable case 3. The other part (the hatched part) is a light shielding part 34. The light shielding material 33 is not limited to the back surface side of the transparent plate 4 and may be applied to the front surface side.

Further, with respect to the light transmitting portion A ₄ corresponding to the point light source hole 29 of the transparent plate 4, the two light shielding portions 28, 28 are formed vertically. These light-shielding sections 28 and 28 identify the person to be identified in the region (appropriate iris region) W indicated by the oblique lines in FIG. 7 at the position Y in FIG. It is for inducing. More specifically, in the state where the two light-shielding portions 28 and 28 are disposed between the point light source 27 and the face of the person to be identified, the person to be identified looks forward at the point light source 27 with both eyes and moves forward and backward. When the object is moved in the direction, the point to be identified is indicated by the distance Dp between the point light source 27 and the light-shielding part 28, the width of the light-shielding part 28, and the distance between the two light-shielding parts 28 and 28, as shown at position X in FIG. binocular the illumination region R ₁ of the point light source 27 when distant relative to the light source 27 can recognize the point light source 27 to position.

On the other hand, as shown at position Y in FIG. 6, when the person to be identified approaches the point light source 27 from the position X by a certain distance, both eyes move into the non-illuminated areas R ₂ and R ₂ , and the point light source 27 is moved. It becomes impossible to see. Furthermore, as shown in the position Z of FIG. 6, when the person to be identified further approaches the point light source 27 from the position Y, both eyes move outside the non-illuminated areas R ₂ and R ₂ , so that the point light source 27 is visually recognized. Will be able to. By utilizing such optical characteristics, the width of the light shielding unit 28 itself, the interval between the two light shielding units 28 and 28, and the distance from the point light source 27 to the light shielding unit 28 according to the focal length f of the imaging unit 12 and the focusing range. A distance or the like is determined, and an appropriate iris region W in which the point light source 27 is not visible is set so as to be within the focusing range of the imaging means 12 as shown in FIG.

  In this way, as shown at position Y in FIG. 6, if both eyes of the person to be identified move within the in-focus range and the point light source 27 becomes invisible, both eyes are appropriate for the imaging unit 12. The person to be identified can be recognized to have been guided to the iris region W. On the other hand, when the eyes of the person to be identified are moved to the position indicated by the position X in FIG. 6, that is, far from the in-focus range, the point light source 27 can be seen between the two light shielding portions 28 and 28. Become. On the other hand, when both eyes are too close to the point light source 27 indicated by the position Z in FIG. 6, the point light source 27 can be seen outside the light shielding portion 28. The person to be identified can recognize that it is deviated from the iris region W. In FIG. 7, D is a distance from the light shielding portion 28 to the center of the focusing range.

Next, the identification operation of the person to be identified by the personal identification device 1 having such a structure will be described.
At the time of identification, the person to be identified stands in front of the personal identification device 1 and faces his face to the movable case 3 so that the point light source 27 and the eye height of the person to be identified coincide. At this time, if the movable case 3 is tilted forward or backward and the face and the movable case 3 do not face each other, the face is faced up or down, or the movable case 3 is rotated by the hand in the front-rear direction. Let them face each other.

  It can be confirmed by looking at the mirror 26 with both eyes whether or not the face and the movable case 3 face each other and whether or not they are displaced vertically and horizontally. That is, when viewing the mirror 26 with both eyes, if both eyes are in the proper position of the mirror 26, the face is directly facing the movable case 3 and is not displaced vertically or horizontally. I understand that. On the other hand, when both eyes are not captured at an appropriate position, the face may be moved or the movable case 3 may be rotated so that the images are properly captured.

  Next, both eyes are moved so as to be positioned in the appropriate iris region W by moving the face back and forth while keeping the face and the movable case 3 facing each other. When both eyes move into the appropriate iris region W, the point light source 27 becomes a shadow of the light shielding portion 28 and cannot be visually recognized. As a result, the person to be identified can recognize that both eyes have moved into the proper iris region W. Then, when it is confirmed that both eyes are located in the proper iris region W, the capture button 10 is operated by hand.

  In FIG. 8, when the CPU 50 detects that the take-in button 10 has been operated, it sends a drive signal to the imaging means 12. The imaging unit 12 captures the iris of the person to be identified by the drive signal from the CPU 50, and sends the image pattern to the verification determination circuit on the circuit board 5. Upon receipt of the iris image pattern, the collation determination circuit collates with a registered pattern registered in advance based on a predetermined collation algorithm to authenticate the identified person.

Here, in the present embodiment, the verification determination operation is performed by the verification determination circuit formed on the circuit board 5 separately from the CPU 50. However, as shown in FIG. A function may be provided. In this case, the collation determination circuit 51 of the CPU 50 performs a determination operation according to the determination program stored in the memory 52 and the registered pattern, and outputs the result.

  Thus, in the present invention, the recognition means 25 is composed of the point light source 27 and the two light-shielding portions 28, 28. Therefore, if the point light source 27 becomes invisible by moving the face back and forth, the iris is in the proper iris region W. It is possible to make the identified person recognize that it has been guided to the inside. For this reason, it is not necessary to use an expensive circuit, an electronic component, a display, etc., and it can manufacture at low cost. Further, since an LED may be used as the point light source 27, it can be as small as 1 mm square, and the two light shielding portions 28 can also be formed by a paint film, a film, etc. It is not necessary and the device is not enlarged.

  In addition, since the identified person can know whether or not both eyes are properly captured by looking at the mirror 26, the face can be moved while looking at the mirror 26 to correct the vertical and horizontal misalignment. it can.

FIG. 9 is a diagram showing a second embodiment of the present invention.
This embodiment is different from the recognition means 25 in the first embodiment described above in that the recognition means 42 is constituted by the point light source 27 and the light shielding member 41 having the two light transmitting portions 40 and 40. . The two light transmitting portions 40 are provided in place of the two light shielding portions 28 of the recognition means 25, and portions other than the light transmitting portions 40 form light shielding portions. The light shielding member 41 is not limited to an opaque member, and may be a transparent member formed with a light shielding film.

  The light transmitting part 40 is formed by a hole (opening) when the light shielding member 41 itself is made of an opaque material. On the other hand, in the case where the light shielding member 41 is made of a transparent material, it is only necessary to leave a portion to be the light transmitting portion 40 and form a light shielding film in the other portions.

In the collation determination of the person to be identified, a light shielding member 41 having two light-transmitting portions 40 and 40 that are narrower than the distance between both eyes is arranged between the point light source 27 and the face of the person to be identified, so that both the point light sources 27 are placed. When viewed with the eye, the point light source 27 may or may not be visible through the translucent part 40 depending on the width of the translucent part 40, the distance between the point light source 27 and the translucent part 40, and the distance between the translucent parts 40 and 40. . That is, as shown in the position X of FIG. 9, when both eyes are far away from the point light source 27, the point light source 27 is located on the light shielding member 41 because it is located inside the irradiation areas Q ₁ and Q _{2 of} the point light source 27. It becomes impossible to see as a shadow. When the eyes are moved closer to the point light source 27 and moved into the irradiation areas Q ₁ and Q ₂ of the point light source 27 as shown at position Y in FIG. 9, the point light source 27 can be visually recognized through the light transmitting portions 40 and 40. . Then, when both eyes are brought closer to the point light source 27 as indicated by the position Z in FIG. 9, both eyes move to the outside of the irradiation areas Q ₁ and Q ₂ of the point light source 27. It becomes shadow and cannot be seen. Therefore, the width and interval of the translucent part 40, the distance from the point light source 27, and the like are determined so that the appropriate iris region W ₁ that can be visually recognized by the point light source 27 is within the focusing range of the imaging means 12. Thereby, like the recognition means 25 in the first embodiment described above, the iris of the person to be identified can be guided to the appropriate iris region W ₁ .

  In such a recognition means 42, since only the point light source 27 and the light shielding member 41 need be used, it will be apparent that the same effects as those of the first embodiment described above can be obtained.

The present invention is not limited to the first and second embodiments described above, and various modifications and changes can be made. For example, the imaging means 12 is not limited to two and may be one. In this case, the mirror 26 may be a half mirror, and the imaging unit 12 may be disposed on the back side.
The light shielding portion 28 of the light shielding member may be translucent, colored in an appropriate color, or may have a shape other than a belt shape, such as a rectangle or a circle.
Further, the point light source 27 is not limited to being constantly lit, but may be blinking.

  Although the present invention is applied to an apparatus for identifying using an iris pattern as a personal identification apparatus, the present invention is not limited to this, and can be applied as it is to an apparatus for identifying based on a facial shape or a retina pattern.

1 is an exploded perspective view of a personal identification device according to a first embodiment of the present invention. It is a front view of the same apparatus. It is a side view of the same apparatus. It is a rear view of a transparent board. It is a figure explaining the imaging state of a to-be-identified person. It is a figure explaining the difference in the appearance of the point light source by a light-shielding part. It is a figure which shows the relationship between a focusing range and a suitable iris area | region. It is a block diagram of the principal part of a personal identification device. It is a figure which shows the 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Personal identification apparatus, 2 ... Main body case, 3 ... Movable case, 4 ... Transparent board, 10 ... Acquisition button, 12 ... Imaging means, 25 ... Recognition means, 26 ... Mirror, 27 ... Point light source, 28 ... Light-shielding part, 40 ... translucent part, 41 ... light-shielding member, 42 ... recognizing means, W, W ₁ ... appropriate iris region.

Claims (6)

The identified person's face or a part of the face is imaged by the imaging means, and the image information and the image information of the person's face or part of the face registered in advance are collated by the collation determining means, thereby In a personal identification device for identifying whether or not a person is the person,
Recognizing means for allowing the identified person to visually recognize that the face or a part of the face is located within a focusing range of the imaging means;
The recognizing means is disposed between a point light source and the point light source and the identified person, and from the identified person only when the face or a part of the face is located within the focusing range of the imaging means. A personal identification device characterized in that the point light source is configured to be invisible or visible, and a light shielding member that is otherwise visible or invisible at other positions.   The light-shielding member makes the point light source invisible to the identified person only when a part of the face is located within the in-focus range of the imaging means, and makes two light-shields visible at other positions. The personal identification device according to claim 1, further comprising a unit.   The light-shielding member allows the point light source to be seen by the person to be identified only when a part of the face is located within the focusing range of the imaging unit, and on the other hand, the two light-transmitting members make it impossible to see the other. The personal identification device according to claim 1, further comprising an optical part.   A main body case and a movable case provided on the upper portion of the main body case so as to be capable of angle adjustment in the front-rear direction, and the imaging means, the point light source, and the light shielding member are incorporated in the movable case. The personal identification device according to claim 1.   The personal identification device according to any one of claims 1 to 4, further comprising a mirror that captures both eyes of the person to be identified. A capture button that is operated by the identified person when at least a part of the face of the identified person is located within the focusing range of the imaging means;
The personal identification device according to claim 1, wherein when the capture button is operated, a part of the face of the identified person is imaged by the imaging unit. .

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