JP4622541B2 - Iris photography device - Google Patents

Description

  The present invention relates to an iris photographing apparatus that photographs an iris (iris) for personal identification.

JP 2003-308523 A

FIG. 2 is a configuration diagram of the iris photographing apparatus described in Patent Document 1.
In this iris photographing device, light sources L1 and L2 for irradiating illumination light to the iris are arranged on the left and right sides of the photographing optical axis connecting the subject's iris and the image pickup device 1, and the subject's oblique angle is set. Light sources L3 and L4 that irradiate illumination light from above are arranged. The light sources L1 to L4 are turned on by the lighting switching unit 2, and two of these light sources L1 to L4 are sequentially selected and turned on in a predetermined order. The imaging device 1 captures the subject's iris whenever the light sources L1 to L4 are turned on, and sequentially stores the image data in the image storage unit 3.

  The plurality of image data stored in the image storage unit 3 is read out by the image output unit 4, and image data that is not affected by the spectacle reflection is selected and output to the iris recognition device. In this way, a plurality of light sources L1 to L4 are arranged around the image pickup device 1, and they are sequentially switched and turned on two by two so that the iris is photographed. Also, it is said that iris image data without the influence of spectacle reflection can be obtained, and the apparatus can be miniaturized.

  However, in the iris photographing apparatus, when the subject wears spectacles, in order to prevent the light irradiated from the light sources L1 to L4 and reflected by the spectacles from being photographed on the iris, the light source It is necessary to keep a large interval between L1 and L2, and there is a limit to downsizing the apparatus. An object of the present invention is to provide an iris photographing apparatus that is smaller and is not affected by spectacle reflection by devising the positional relationship between a camera and illumination.

An iris photographing apparatus according to a first aspect of the present invention is a camera for photographing the subject's iris, and when photographing the iris, the eye part of the subject is switched between the right side and the left side, Alternatively, the first and second light sources arranged at different positions so as to switch and illuminate from the upper side and the lower side, and arranged adjacent to the first light source, illuminated by the first light source and output. The first mirror for reflecting the image of the eye of the subject to be photographed at a predetermined position, and the subject to be illuminated and output by being illuminated by the second light source. A second mirror that reflects the image of the eye of the subject to the predetermined position, and an image of the eye of the subject that is disposed at the predetermined position and reflected from the first or second mirror, A third mirror that reflects and enters the camera; and the first and second mirrors Corresponding to the switching of the illumination of the source, the reflected light of the mirror adjacent to the light source corresponding to the switching of the illumination of the first or second mirror is incident on the camera. And a mirror switching unit for switching the angle.
According to a second aspect of the present invention, there is provided an iris photographing apparatus, a camera for photographing the subject's iris, a plurality of mirrors arranged at different positions and reflecting images of the subject's eyes respectively at predetermined positions, and the plurality of the plurality of mirrors. A plurality of light sources respectively disposed adjacent to the mirrors for illuminating the subject's eyes when photographing the iris, and images of the eyes reflected by the plurality of mirrors respectively. The reflected light of the mirror adjacent to the light source corresponding to the illumination switching among the plurality of mirrors is incident on the camera in correspondence with the switching of the illumination of the plurality of light sources. And a mirror switching unit that switches the angle of the movable mirror to a corresponding angle.
According to a third aspect of the present invention, there is provided an iris photographing apparatus that includes a plurality of cameras that photograph the subject's iris, and that are adjacent to the plurality of cameras and that are arranged at different positions, respectively, and that are to be photographed when photographing the iris. A plurality of light sources that respectively illuminate the eyes of the person, and in conjunction with the switching of the plurality of cameras, the illumination of the plurality of light sources is switched to the illumination of the light source adjacent to the camera and the iris is photographed It is characterized by being performed by a switched camera .

According to the present invention, when a plurality of light sources are provided at different positions and the iris is photographed by the camera, the light sources are switched, and illumination is performed from a plurality of directions. By performing imaging using this, it is possible to obtain an image that is not affected by spectacle reflection in any of a plurality of light sources, thereby realizing a small iris imaging device that is not affected by spectacle reflection.

  One camera for photographing the subject's iris, and first and second light sources arranged to illuminate by switching the eye part from the right side and the left side (or the upper side and the lower side) when photographing the iris Is provided. In addition, a first mirror that reflects an image of the eye of the subject illuminated by the first light source and output to a predetermined position is disposed at substantially the same location as the first light source, and the second light source A second mirror that reflects the image of the eye of the subject to be illuminated and output to the same predetermined position is disposed at substantially the same location as the second light source. Further, a third mirror that reflects the image of the eyes reflected from the first and second mirrors and enters the camera is provided, and the angle of the third mirror is adjusted according to the lighting of the first and second light sources. A mirror switching unit for switching between is provided.

  The above and other objects and novel features of the present invention will become more fully apparent when the following description of the preferred embodiment is read in conjunction with the accompanying drawings. However, the drawings are for explanation only, and do not limit the scope of the present invention.

FIG. 1 is a configuration diagram illustrating an iris photographing apparatus according to a first embodiment of the present invention.
This iris photographing apparatus has cameras 11L and 11R for photographing the iris not from the front of the subject's eyes but from a position slightly shifted left and right. Light sources 12L and 12R corresponding to the cameras 11L and 11R are arranged adjacent to each other. The cameras 11L and 11R do not use photographic film, but output images taken using an imaging device as electrical signals, such as video cameras. Further, the focus adjustment may be a fixed focus type that is set in advance, but better image data can be obtained if an autofocus function is provided.

  Image data captured by the cameras 11L and 11R is provided to the image storage unit 14 via the camera switching unit 13. The image storage unit 14 stores image data output from the camera switching unit 13, and an image output unit 15 is connected to the image storage unit 14. The image output unit 15 selects image data not affected by spectacle reflection from the image data stored in the image storage unit 14 and outputs the selected image data to an iris recognition device (not shown).

  On the other hand, the lighting of the light sources 12L and 12R is controlled by the lighting switching unit 16. When the same switching signal SEL is given to the lighting switching unit 16 and the camera switching unit 13 from the control unit 17 and the camera 11L is selected, the light source 12L paired with this is turned on and the camera 11R is selected. When this occurs, the light source 12R that is paired with the light source 12R is turned on. Further, a control signal for controlling each operation is given from the control unit 17 to the image storage unit 14 and the image output unit 15.

  In this iris photographing apparatus, when the subject comes to a predetermined photographing position and is ready by staring at a target provided in the center of the left and right cameras 11L and 11R, the camera 11L and the light source are switched by the switching signal SEL. 12L is selected, and the subject's eyes are photographed from slightly left front. Subsequently, the camera 11R and the light source 12R are selected by the switching signal SEL, and the eye of the subject is photographed from the right front.

  Image data photographed by the cameras 11L and 11R are sequentially stored in the image storage unit 14 under the control of the control unit 17. Next, the image data stored in the image storage unit 14 is read out by the image output unit 15 in accordance with the control from the control unit 17, and image data that is not affected by spectacle reflection is selected. The selected image data is output from the image output unit 15 to the iris recognition device.

  3 (a) and 3 (b) are explanatory views showing the mechanism of occurrence of spectacle reflection. FIG. 3 (a) corresponds to the conventional iris photographing apparatus of FIG. 2, and FIG. 3 (b) shows the present invention. This corresponds to the iris photographing apparatus of FIG.

  3A and 3B, the arc G represents the surface of the spectacle lens assumed to be a spherical surface, and the point O represents the center of the arc G. An iris I, which is a subject, is positioned immediately inside the arc G, and a camera C and a light source L are arranged outside the arc G with a predetermined distance from the arc G.

  As shown in FIG. 3A, when the camera C is arranged in front of the subject and the subject is irradiated with illumination light from the light source L arranged beside the camera C, the illumination light is equal to 2 etc. of the angle LOC. The light is reflected at the intersection X between the segment OH and the arc G and enters the camera C. This is photographed by the camera C as spectacle reflection. At this time, the image of the iris I illuminated by the illumination light of the light source L is also taken by the camera C at the same time. Therefore, in order to prevent the image of the iris I photographed by the camera C from overlapping with the spectacle reflection, the intersection CAL of the line CI that connects the camera C and the outside of the iris I and the arc G is A, and the angle CAL is It is necessary to arrange the light source L at a position that is twice or more the angle CAH.

  On the other hand, as shown in FIG. 3B, when the camera C is arranged obliquely in front of the subject and the subject is irradiated with illumination light from the light source L arranged at the same position as the camera C (in practice, exactly the same) The camera C and the light source L cannot be arranged at the positions, but they can be arranged very close to each other by downsizing the camera and the light source), and the spectacle reflection connects the camera C and the center O of the arc G. It occurs at the intersection Y between the line segment OC and the arc G. Therefore, in order to prevent the image of the iris I photographed by the camera C from overlapping with the eyeglass reflection, the camera C and the light source L are arranged outside the line segment OI connecting the center O and the outside of the iris I. It ’s fine.

  That is, in the case of FIG. 3A, the light source L needs to be arranged away from the light source indicated by the dotted line, and in the case of FIG. 3B, the camera C and the light source L are positioned from the position indicated by the dotted line. May be arranged outside. 3A and 3B, it can be seen that the iris photographing apparatus of the first embodiment can shorten the interval between the two sets of light sources (cameras) than the conventional iris photographing apparatus.

  As described above, in the iris photographing apparatus of the first embodiment, the camera 11 and the light source 12 are set, and the subject's eyes are photographed slightly obliquely forward from the front. Even if the interval is narrowed, there is an advantage that iris image data without spectacle reflection can be acquired. Further, since the two sets of cameras 11L and 11R are used to shoot from the left and right, there is an advantage that normal image data can be obtained with either one of the cameras even if the glasses are tilted.

In addition, this invention is not limited to the said Example 1, A various deformation | transformation is possible. Examples of this modification include the following.
(1) Although the camera 11 and the light source 12 are arranged on the left and right, they may be arranged on the upper and lower sides. Furthermore, four sets of cameras 11 and light sources 12 may be arranged on the top, bottom, left and right. By using a large number of cameras, the probability of obtaining normal image data becomes higher.
(2) Although two sets of cameras 11 and light sources 12 are switched and photographed, a transport mechanism that moves by mounting the cameras and the light sources is provided, and the one set of cameras 11 and light sources 12 are oblique to the subject. You may make it move ahead and image | photograph a some image.
(3) The cameras 11L and 11R are provided with a zoom and tilt mechanism, and a third camera for photographing the face of the subject is provided, and the position of the subject's eyes is determined from the image data obtained from the third camera. By calculating the above and controlling the focal lengths and angles of these cameras 11L and 11R, more accurate image data can be obtained.

  FIG. 4 is a block diagram showing an iris imaging apparatus according to the second embodiment of the present invention. Elements common to those in FIG. 1 are denoted by common reference numerals.

  This iris photographing apparatus has a camera 11 disposed in front of the subject and light sources 12L and 12R that illuminate the eye E from a position slightly deviated left and right from the front. The mirrors 18L and 18R that reflect the image of the eye E are fixed adjacent to the light sources 12L and 12R, and the image of the eye E reflected by the mirrors 18L and 18R is placed between the subject and the camera 11. Further, a rotary mirror 18 for reflecting and guiding to the camera 11 is disposed.

  The mirror 18 is driven by a mirror switching unit 19 that switches a reflection angle by a switching signal SEL given from the control unit 17. That is, when the light source 12L is selected by the switching signal SEL, the mirror switching unit 19 switches the angle of the mirror 18 so that the image of the eye reflected by the mirror 18L enters the camera 11. When the light source 12R is selected by the switching signal SEL, the mirror switching unit 19 switches the angle of the mirror 18 so that the image of the eye E reflected by the mirror 18R is incident on the camera 11.

  Image data captured by the camera 11 is given to an image storage unit 14, and an image output unit 15 is connected to the image storage unit 14. In addition, lighting of the light sources 12L and 12R is controlled by the lighting switching unit 16. These image storage unit 14, image output unit 15 and lighting switching unit 16 are the same as those in FIG.

  In this iris photographing apparatus, when the subject comes to a predetermined photographing position and is ready by staring at the target provided at the center of the left and right light sources 12L, 12R, the camera light source 12L, Along with 12R, the angle of the mirror 18 is simultaneously switched, and the eye E of the subject is photographed from a slightly oblique front.

  For example, when the right light source 12R is selected by the switching signal SEL, the image of the eye E irradiated with the light from the light source 12R is reflected by the mirror 18R and guided to the mirror 18 as shown by the solid line in the drawing. Further, the light is reflected by the mirror 18 and guided to the camera 11. When the left light source 12L is selected by the switching signal SEL, the mirror 18 is switched to an angle as indicated by a broken line. As a result, the image of the eye E irradiated with the light from the light source 12L is reflected by the mirror 18L and guided to the mirror 18, and further reflected by the mirror 18 to the camera 11, as indicated by a broken line in the drawing. Led.

  Image data taken by the camera 11 is sequentially stored in the image storage unit 14 under the control of the control unit 17. The image data stored in the image storage unit 14 is read out by the image output unit 15 under the control of the control unit 17, and image data that is not affected by the spectacle reflection is selected and output to the iris recognition device.

  As described above, the iris photographing apparatus according to the second embodiment is configured to photograph the eye E of the person to be photographed slightly obliquely forward from the front with the light source 12 and the mirror 18 as a set. Similarly, there is an advantage that iris image data without spectacle reflection can be acquired even if the interval between the two sets of light sources is narrowed. In addition, since shooting is performed from the left and right directions, there is an advantage that normal image data can be obtained in either direction even if the glasses are tilted. In addition, although the mirror 18 and the mirror switching part 19 for switching the reflection angle are needed, since only one camera 11 is required and the camera switching part is not necessary, the cost is reduced as compared with the first embodiment. There is an advantage that you can.

The present invention is not limited to the second embodiment and can be variously modified. Examples of such modifications include the following.
(1) Although the light sources 12 are arranged on the left and right, they may be arranged on the top and bottom. Further, four sets of light sources 12 and mirrors 18 may be arranged on the top, bottom, left and right. By using a large number of light sources 12, the probability of obtaining normal image data is further increased.
(2) The subject, the light source 12, the mirrors 18, 18L, 18R, and the camera 11 are arranged on the same plane. For example, when the mirror 18 is inclined 45 ° obliquely upward, the camera 11 is directed downward (in the figure). (Perpendicular to the plane). As a result, the depth of the iris photographing apparatus can be shortened and further miniaturized.

It is a block diagram of the iris imaging device which shows Example 1 of this invention. It is a block diagram of the conventional iris imaging device. It is explanatory drawing which shows the generation | occurrence | production mechanism of spectacles reflection. It is a block diagram of the iris imaging device which shows Example 2 of this invention.

Explanation of symbols

11, 11L, 11R Camera 12L, 12R Light source 13 Camera switching unit 14 Image storage unit 15 Image output unit 16 Lighting switching unit 17 Control unit 18, 18L, 18R Mirror 19 Mirror switching unit E Eye

Claims (3)

A camera that captures the iris of the subject,
A first light source and a second light source arranged at different positions so as to illuminate by switching the eye part of the subject to the right side and the left side or switching from the upper side and the lower side when photographing the iris; ,
A first mirror that is arranged adjacent to the first light source and reflects the image of the eye of the subject to be photographed illuminated by the first light source to a predetermined position;
A second mirror disposed adjacent to the second light source and reflecting the image of the subject's eye that is illuminated by the second light source and output to the predetermined position;
A third mirror that is disposed at the predetermined position and reflects the image of the subject's eye reflected from the first or second mirror to be incident on the camera;
Corresponding to the switching of the illumination of the first and second light sources, the reflected light of the mirror adjacent to the light source corresponding to the switching of illumination among the first or second mirrors is incident on the camera. And a mirror switching unit for switching the angle of the third mirror,
An iris photographing apparatus characterized by comprising. A camera that captures the iris of the subject,
A plurality of mirrors arranged at different positions, each reflecting an image of the eye of the subject to a predetermined position;
A plurality of light sources arranged adjacent to the plurality of mirrors, respectively, for illuminating each part of the subject's eyes when photographing the iris;
A movable mirror that causes the images of the eyes reflected by the plurality of mirrors to enter the camera;
Corresponding to switching of illumination of the plurality of light sources, the movable mirror is movable at a corresponding angle so that reflected light of the mirror adjacent to the light source corresponding to switching of illumination among the plurality of mirrors enters the camera. A mirror switching section for switching the angle of the mirror,
An iris photographing apparatus characterized by comprising. A plurality of cameras for photographing the subject's iris;
A plurality of light sources that are adjacent to each of the plurality of cameras and are arranged at different positions, and respectively illuminate each portion of the subject's eyes when photographing the iris,
In conjunction with switching of the plurality of cameras, the iris photographing apparatus is configured to switch to illumination of a light source adjacent to the camera among illuminations of the plurality of light sources and to perform photographing of the iris.

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