JP4154917B2 - Iris photography device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
[0002]
The present invention relates to an iris photographing apparatus that photographs an iris (iris) for personal identification.
[0003]
[Prior art]
[0004]
An iris recognition system for identifying an individual includes an imaging device that captures an iris of a person to be identified, and a processing device that performs recognition processing based on iris image data obtained by the imaging device. The imaging device includes a light source that irradiates light to an iris portion to be imaged and an imaging element that captures an eye illuminated by the light source. The light source is necessary for acquiring iris image data suitable for image processing, but depending on the implementation, it is difficult to realize good illumination conditions depending on the eye condition of the subject. There is a case. The quality of the iris coding process performed by the processing apparatus depends largely on the quality of the image obtained by the imaging apparatus, and the performance of the imaging apparatus greatly affects the performance of the iris recognition system.
[0005]
2A to 2D are explanatory diagrams of a conventional iris photographing apparatus and its problems.
[0006]
FIG. 2A shows the positional relationship between the imaging element and the light source of the iris photographing apparatus and the eyes of the subject at the time of photographing. As shown in FIG. 2A, the iris photographing apparatus has a fixed-focus lens and has an image sensor 10 such as a CCD or CMOS image sensor. The image sensor 10 and the eye of the subject. Light sources La and Lb such as LEDs that emit near-infrared light or visible light close to near-infrared light are arranged near the left and right of the photographing optical axis connecting the centers.
[0007]
An example of these positional relationships is shown by specific numerical values. The distance between the eyes and the image sensor 10 is 8 cm, the distance between the eyes and the light sources La and Lb is 4 cm, and the distance between the light sources La and Lb and the photographing optical axis. Are each 1.5 cm. As described above, by making the optical system compact, there is an advantage that the illumination efficiency is improved and the power consumption of the illumination is kept low, and uniform illumination without unevenness can be achieved.
[0008]
[Problems to be solved by the invention]
[0009]
However, the conventional iris photographing apparatus has the following problems.
[0010]
When the subject wears spectacles, the illumination light is reflected by the lens of the spectacles and enters the image sensor 10, and as shown in FIG. 2 (b), a part of the photographed iris image is displayed. May cause spectacle reflection. When spectacle reflection occurs, the amount of data for generating an iris code from a photographed image decreases, an accurate iris code cannot be generated, or the iris code itself cannot be generated, and the recognition processing time increases. It was the cause that lowered recognition performance.
[0011]
As one method of avoiding spectacle reflection, as shown in FIG. 2C, instead of the light sources La and Lb near the left and right of the photographing optical axis, the light sources Lx and Ly are located at positions sufficiently away from the photographing optical axis. There is a way to arrange. Thereby, the reflection angle of the light irradiated from the light sources Lx and Ly and reflected by the lens surface of the glasses increases, and the reflected light can be prevented from entering the image sensor 10.
[0012]
In general, the shape of a spectacle lens has a larger curvature on the outer corner than on the front. This is because, in consideration of the characteristic that the visual field on the outer corner of the human eye is wide, the visual field in that direction is widened. As human visual field characteristics, there is a tendency to look slightly below the horizontal, so that the spectacle lens has a lower curvature than the upper side in order to increase the field of view in that direction.
[0013]
Due to the shape of the spectacle lens, the distance between the light sources Lx and Ly and the photographing optical axis is arranged such that the light source Ly on the outer corner side is further away from the light source Lx on the eye side as shown in FIG. There is a need.
[0014]
  In the iris photographing device, it is necessary to photograph the left and right eyes under the same conditions, so the left and right light sources Lx and Ly areSymmetryThe distance between these light sources Lx and Ly needs to be further increased. For this reason, there existed a subject that the dimension of an optical system became large and the light sources Lx and Ly with big light quantity were needed.
[0015]
Also, when the subject wears a hard contact lens, as shown in FIG. 2D, the shadow of the outer periphery of the contact lens is photographed with being superimposed on the iris image. In particular, the left and right light sources La and Lb cause shadows of the contact lens to enter the left and right sides of the image, and the position changes each time the eye blinks, which is a factor that reduces the recognition rate of the hard contact lens wearer. .
[0016]
The present invention solves the problems of the prior art and provides a small iris photographing apparatus capable of photographing an iris image without being affected by glasses or the like.
[0017]
[Means for Solving the Problems]
[0018]
  In order to solve the above-mentioned problems, a first invention of the present invention is an iris photographing apparatus,First and second light sources that irradiate light to the iris portion of the subject to be photographed from the right and left sides of the subject's eye wearing the naked eye or glasses, and the right and left sides of the subject's eye Third and fourth light sources that irradiate light to the iris portion of the subject to be photographed from diagonally above, and the first and fourth supposing the subject's left eye is photographed during the first photographing period. A lighting control unit that turns on the light sources at the same time and lights up the second and third light sources at the same time in the second shooting period assuming the shooting of the subject's right eye;SaidDepending on the light source lit by the lighting controllerAnd an imaging unit that images the illuminated iris of the subject.
[0019]
  According to the first aspect of the present invention, illumination is performed in consideration of left-eye spectacles reflection in the first photographing period, and the right-eye spectacles in the second photographing period. Illumination is performed in consideration of reflection.
[0020]
  The second aspect of the invention is an iris photographing device, wherein the first and second light sources irradiate light to the iris portion of the subject to be photographed from the right side and left side of the eye of the subject wearing the hard contact lens, respectively, Third and fourth light sources that irradiate light to the iris portion of the subject to be photographed from obliquely above the right and left sides of the subject's eyes, and photographing the subject's left eye during the first photographing period A lighting control unit that turns on the first and third light sources at the same time, and lights up the second and fourth light sources at the same time in the second shooting period assuming shooting of the subject's right eye. When,SaidA photographing unit that photographs the iris of the subject illuminated by the light source that is lit by the lighting control unit.
[0021]
  According to the second invention, illumination is performed in consideration of the shadow of the hard contact lens of the left eye during the first imaging period. Illumination is performed in consideration of the shadow of the right eye hard contact lens during the second imaging period.
[0022]
  The third invention isIt has a lighting control unit that sequentially switches between specular reflection of normal spectacles and illumination in consideration of the shadow of the hard contact lens.
[0023]
  4th and 5th invention has the lighting control part which switches illumination according to the wearing condition of spectacles or a hard contact lens.
[0024]
  First6The invention ofThe lighting control unit according to the first to fifth aspects of the invention is configured to sequentially turn on and turn on the first to fourth light sources according to each shooting period, and the shooting unit is switched every time the light source is switched by the lighting control unit. The image storage unit is configured to repeatedly photograph the subject's iris, and holds a plurality of image data of the subject's iris photographed by the photographing unit, and the image storage unit holds the image data. An image selection unit is provided to select an image suitable for generating an iris code from among a plurality of image data.ing.
[0030]
DETAILED DESCRIPTION OF THE INVENTION
[0031]
(First embodiment)
[0032]
FIG. 1 is a configuration diagram of an iris photographing apparatus showing a first embodiment of the present invention.
[0033]
The iris photographing apparatus has a two-dimensional image sensor 10 composed of a CCD, a CMOS image sensor, or the like that photographs a subject's eyes (notably an iris) (not shown). The imaging element 10 incorporates a fixed focus lens that is focused at a position of about 8 cm ahead. Further, on the left and right of the photographing optical axis connecting the subject's eye and the image sensor 10, a light source L1 that irradiates light on the iris portion of the subject to be photographed from the diagonally forward side on the right side of the subject's eye, and the diagonal on the left side. A light source L2 that irradiates light to the iris portion of the subject to be photographed from the front is arranged symmetrically.
[0034]
Further, a light source L3 that irradiates light to the iris portion of the subject to be photographed from the diagonally upper right side of the subject's eye and a light source L4 that irradiates light to the iris portion of the subject of photographing from the diagonally upper left side are arranged. . These light sources L <b> 1 to L <b> 4 are disposed about 4 cm ahead of the image sensor 10, that is, about 4 cm from the subject. Each of the light sources L <b> 1 to L <b> 4 is configured by an LED or the like that emits near-infrared light or visible light close to near-infrared light, and can be individually blinked by the lighting switching unit 20.
[0035]
A focus detection unit 30 and an image storage unit 40 are connected to the output side of the image sensor 10. The focus detection unit 30 detects, from the image data output from the image sensor 10, the rate of change in luminance of the contour portion of the image in a specific range, and detects when the value of the luminance change exceeds a preset threshold value. A signal is output. The image storage unit 40 holds image data output from the image sensor 10. An image output unit 50 is connected to the image storage unit 40.
[0036]
The image output unit 50 reads out the image data held in the image storage unit 40 and outputs it to a recognition processing device (not shown).
[0037]
The iris photographing apparatus has a control unit 60 that controls the entire operation. The control unit 60 has a function of instructing the imaging timing to the imaging element 10 and instructing the lighting switching unit 20 to blink the light sources L1 to L4. In addition, the control unit 60 sequentially stores a plurality of image data captured by switching the light sources L <b> 1 to L <b> 4 in accordance with the detection signal from the focus detection unit 30, or outputs an image to the image output unit 50. A series of controls such as reading and outputting the image data in the storage unit 40 are performed.
[0038]
Further, the control unit 60 is connected to an audio output unit 70 for notifying the person to be imaged of a shooting situation or the like by voice.
[0039]
FIGS. 3A and 3B are explanatory views showing the relationship between the light source arrangement and the photographed image in FIG. 1 which is a feature of the present embodiment, and FIG. 3A is the image sensor 10 in FIG. An example of the arrangement of the optical system by the light sources L1 to L4 and FIG.
[0040]
As shown in FIG. 3A, the light source L2 is disposed on the left side slightly away from the photographing optical axis (for example, about 2 cm) compared to the conventional light source La. This is for the purpose of preventing the light that enters the image sensor 10 from being reflected by the eye side of the spectacle lens from overlapping the iris image. On the other hand, the light source L3 is arranged on the upper side, for example, about 1 cm so as to be slightly separated from the photographing optical axis as compared with the conventional light source Lb and to illuminate the subject's eye from obliquely above. This is for the purpose of preventing the light reflected on the upper side of the spectacle lens and entering the image sensor 10 from overlapping the iris image.
[0041]
As a result, as shown in FIG. 3B, the eyeglass reflections of the light sources L2 and L3 move laterally and obliquely below the iris, and a complete iris image is obtained. Although the light sources L2 and L3 are arranged for photographing the right eye, the light sources L1 and L4 are arranged symmetrically with respect to the vertical plane including the photographing optical axis in order to photograph the left eye using the same image sensor 10. ing.
[0042]
FIGS. 4A and 4B are flowcharts showing the operation of FIG. The operation of FIG. 1 will be described below with reference to FIG.
[0043]
FIG. 4 (a) considers a spectacle wearer. When the person to be photographed approaches a predetermined position of the iris photographing apparatus, a sensor (not shown) detects this and the operation is started.
[0044]
In step S <b> 1, for example, an instruction for lighting the light sources L <b> 3 and L <b> 4 is issued from the control unit 60 to the lighting switching unit 20, and subsequently, an imaging instruction is issued to the image sensor 10. As a result, image data captured from the image sensor 10 is output and provided to the focus detection unit 30.
[0045]
The focus detection unit 30 detects the change rate of the luminance of the contour portion of the image in a specific range from the image data given from the image sensor 10, and the detection signal when the value of the luminance change exceeds a preset threshold value. Is output. In the control unit 60, until the detection signal is output from the focus detection unit 30, the imaging instruction to the image sensor 10 is repeated while outputting an appropriate guide message from the audio output unit 70 to the subject. . When a detection signal is output from the focus detection unit 30, the process proceeds to step S2.
[0046]
In step S2, the control unit 60 instructs the lighting switching unit 20 to turn on the light sources L1 and L4. Thereby, the light sources L1 and L4 are turned on, and the light sources L2 and L3 are turned off.
[0047]
In step S <b> 3, the control unit 60 issues a shooting instruction to the image sensor 10 and also instructs the image storage unit 40 to hold the image data output from the image sensor 10. As a result, the image data captured by the image sensor 10 is stored in the image storage unit 40. This image data is set so that the eyeglass reflection does not overlap the iris image of the left eye wearing the glasses.
[0048]
In step S4, the control unit 60 issues an instruction for lighting the light sources L2 and L3 to the lighting switching unit 20. Thereby, the light sources L2 and L3 are turned on, and the light sources L1 and L4 are turned off.
[0049]
In step S <b> 5, an instruction to shoot is issued from the control unit 60 to the image sensor 10, and an instruction is issued to the image storage unit 40 to hold image data output from the image sensor 10. As a result, the image data captured by the image sensor 10 is stored in the image storage unit 40. This image data is set such that the eyeglass reflection does not overlap the iris image of the right eye wearing the glasses. After step S5, the process proceeds to step S10.
[0050]
In step S10, it is determined whether or not the photographing in steps S2 to S5 has been performed a predetermined number of times. If completed, the process proceeds to step S11. If the predetermined number of times of photographing has not been completed, the process returns to step S1 and the processes of steps S2 to S5 are repeated.
[0051]
In step S11, the control unit 60 instructs the image output unit 50 to read out the image data in the image storage unit 40 and output it to the recognition processing apparatus side. When the output of the photographed image data is completed, the operation of the iris photographing apparatus ends.
[0052]
FIG.4 (b) considers a hard contact lens wearer in addition to a spectacles wearer, and adds step S6-S9 after step S5 of Fig.4 (a).
[0053]
In step S <b> 6, an instruction for lighting the light sources L <b> 1 and L <b> 3 is issued from the control unit 60 to the lighting switching unit 20. Thereby, the light sources L2 and L4 are turned on, and the light sources L1 and L3 are turned off.
[0054]
In step S <b> 7, an instruction to shoot is issued from the control unit 60 to the image sensor 10, and an instruction is issued to hold the image data output from the image sensor 10 to the image storage unit 40. As a result, the image data captured by the image sensor 10 is stored in the image storage unit 40. This image data is set so that the shadow of the contact lens does not occur in the iris image of the left eye wearing the hard contact lens.
[0055]
In step S <b> 8, an instruction for lighting the light sources L <b> 1 and L <b> 3 is issued from the control unit 60 to the lighting switching unit 20. Thereby, the light sources L1 and L3 are turned on, and the light sources L2 and L4 are turned off.
[0056]
In step S <b> 9, an instruction for photographing is issued from the control unit 60 to the image sensor 10, and an instruction is issued to the image storage unit 40 to hold image data output from the image sensor 10. As a result, the image data captured by the image sensor 10 is stored in the image storage unit 40. The image data is set so that the shadow of the contact lens does not occur in the iris image of the right eye wearing the hard contact lens. After step S9, the process proceeds to step S10.
[0057]
Other operations are the same as those in FIG.
[0058]
As described above, the iris photographing apparatus according to the first embodiment takes into account the curvature of the spectacle lens, and four light sources arranged as close to the photographing optical axis as possible so that the spectacle reflection does not overlap the iris image. L1 to L4 are provided, and the light sources L1 to L4 are selected two by two, and the iris images corresponding to the right eye and the left eye are sequentially photographed. This makes it possible to reduce the size of the apparatus and to obtain image data obtained by faithfully photographing the iris without being affected by glasses or hard contact lenses.
[0059]
(Second Embodiment)
[0060]
FIG. 5 is a block diagram of an iris photographing apparatus showing a second embodiment of the present invention. Elements common to those in FIG. 1 are denoted by common reference numerals.
[0061]
In this iris photographing apparatus, an image selection unit 45 is inserted between the image storage unit 40 and the image output unit 50 in FIG. 1, and a control unit 60A having a slightly different function is provided instead of the control unit 60.
[0062]
The image selection unit 45 selects one suitable for generating an iris code from among a plurality of iris image data held in the image storage unit 40. Specifically, for example, the density distribution of pixels in a predetermined area of image data is examined, and a pixel whose number of white levels assumed to be spectacle reflection is equal to or less than a certain number is selected as suitable for generating an iris code. It is supposed to be. The selected image data is output to the recognition processing device via the image output unit 50.
[0063]
On the other hand, the control unit 60A includes two photographing mode selection switches 61 and 62. The switch 61 is pressed when the naked eye or the spectacle wearer takes an image of the iris, and the switch 62 is pressed when the hard contact lens wearer takes the image of the iris. As a result, the control unit 60A is programmed to shoot the iris under illumination conditions corresponding to the shooting mode. Other configurations are the same as those in FIG.
[0064]
FIG. 6 is a flowchart showing the operation of FIG. Hereinafter, the operation of FIG. 5 will be described with reference to FIG.
[0065]
When the person to be photographed approaches a predetermined position of the iris photographing apparatus, a sensor (not shown) detects this and the operation is started. The subject operates the switches 61 and 62 according to the wearing state of the glasses. That is, when using naked eyes, normal glasses, or soft contact lenses, the switch 61 is pressed. When the hard contact lens is worn, the switch 62 is pressed.
[0066]
In step S <b> 21, an instruction for lighting the light sources L <b> 3 and L <b> 4 is issued from the control unit 60 </ b> A to the lighting switching unit 20, and subsequently, an imaging instruction is issued to the image sensor 10. As a result, image data captured from the image sensor 10 is output and provided to the focus detection unit 30.
[0067]
The focus detection unit 30 detects the change rate of the luminance of the contour portion of the image in a specific range from the image data given from the image sensor 10, and the detection signal when the value of the luminance change exceeds a preset threshold value. Is output. In the control unit 60 </ b> A, until the detection signal is output from the focus detection unit 30, the shooting instruction to the image sensor 10 is repeated while outputting an appropriate guide message from the audio output unit 70 to the subject. . When the detection signal is output from the focus detection unit 30, the process proceeds to step S22.
[0068]
In step S22, the selected shooting mode is determined. When the switch 61 is pressed, the photographing mode such as the naked eye is set and the process proceeds to step S23. When the switch 62 is pressed, the hard contact lens photographing mode is set and the process proceeds to step S28.
[0069]
When the switch 61 is pressed, in step S23, an instruction for lighting the light sources L1 and L4 is issued from the control unit 60A to the lighting switching unit 20. Thereby, the light sources L1 and L4 are turned on, and the light sources L2 and L3 are turned off.
[0070]
In step S24, the control unit 60A issues a shooting instruction to the image sensor 10, and also instructs the image storage unit 40 to hold the image data output from the image sensor 10. As a result, the image data captured by the image sensor 10 is stored in the image storage unit 40. This image data is set so that the eyeglass reflection does not overlap the iris image of the left eye wearing the glasses.
[0071]
In step S25, an instruction for lighting the light sources L2 and L3 is issued from the control unit 60A to the lighting switching unit 20. Thereby, the light sources L2 and L3 are turned on, and the light sources L1 and L4 are turned off.
[0072]
In step S26, the control unit 60A issues a shooting instruction to the image sensor 10, and also instructs the image storage unit 40 to hold the image data output from the image sensor 10. As a result, the image data captured by the image sensor 10 is stored in the image storage unit 40. This image data is set such that the eyeglass reflection does not overlap the iris image of the right eye wearing the glasses. After step S26, the process proceeds to step S27.
[0073]
In step S27, it is determined whether or not the photographing in steps S23 to S26 has been performed a predetermined number of times. If completed, the process proceeds to step S33. If the predetermined number of times of shooting has not been completed, the process returns to step S23, and the processes of steps S23 to S26 are repeated.
[0074]
On the other hand, when the switch 62 is being pressed, in step S28, an instruction for lighting the light sources L2 and L4 is issued from the control unit 60A to the lighting switching unit 20. Thereby, the light sources L2 and L4 are turned on, and the light sources L1 and L3 are turned off.
[0075]
In step S29, the control unit 60A issues a shooting instruction to the image sensor 10, and also instructs the image storage unit 40 to hold the image data output from the image sensor 10. As a result, the image data captured by the image sensor 10 is stored in the image storage unit 40. This image data is set so that the shadow of the contact lens does not occur in the iris image of the left eye wearing the hard contact lens.
[0076]
In step S30, an instruction for lighting the light sources L1 and L3 is issued from the control unit 60A to the lighting switching unit 20. Thereby, the light sources L1 and L3 are turned on, and the light sources L2 and L4 are turned off.
[0077]
In step S31, the control unit 60A issues a shooting instruction to the image sensor 10, and also instructs the image storage unit 40 to hold the image data output from the image sensor 10. As a result, the image data captured by the image sensor 10 is stored in the image storage unit 40. The image data is set so that the shadow of the contact lens does not occur in the iris image of the right eye wearing the hard contact lens. After step S31, the process proceeds to step S32.
[0078]
In step S32, it is determined whether or not the photographing in steps S28 to S31 has been performed a predetermined number of times. If completed, the process proceeds to step S33. If the predetermined number of times of shooting has not been completed, the process returns to step S28, and the processes of steps S28 to S31 are repeated.
[0079]
In step S33, the control unit 60A instructs the image selection unit 45 to read out the image data in the image storage unit 40 and select one suitable for generating an iris code. As a result, the image data suitable for generating the iris code is selected from the image data in the image storage unit 40 and is output to the recognition processing apparatus side via the image output unit 50. When the output of the selected image data is completed, the operation of the iris photographing apparatus is finished.
[0080]
As described above, the iris imaging apparatus according to the second embodiment includes the image selection unit 45 that selects an image suitable for generating an iris code from the captured image data. The image data is not output to the recognition processing apparatus, and the recognition process can be made more efficient and faster.
[0081]
Further, the switches 61 and 62 allow the user to select a shooting mode depending on the wearing situation of the subject's glasses. This eliminates unnecessary shooting and shortens the shooting time.
[0082]
In addition, this invention is not limited to the said embodiment, A various deformation | transformation is possible. Examples of this modification include the following.
[0083]
(A) The distance between the eye of the subject and the imaging device 10 and the light sources L1 to L4 is not limited to the exemplified values. It is necessary to set an optimum value in accordance with the curvature of a lens for glasses generally used.
[0084]
(B) The blinking order of the light sources L1 to L4 is not limited to the order illustrated in FIG. 4 or FIG.
[0085]
(C) During the imaging of the iris, the light sources L1 to L4 are turned on while being sequentially switched, but during the period in which the image data captured by the image sensor 10 is transferred to the image storage unit 40, these light sources L1 to L4. May be turned off. In this case, for example, it is necessary to control timings such as blinking of the light sources L1 to L4, shutter opening / closing of the image sensor 10, transfer of image data, and the like based on a synchronization signal output from the image sensor 10. Thereby, the lighting time of the light sources L1 to L4 can be shortened, and the power consumption can be reduced.
[0086]
【The invention's effect】
[0087]
  As explained in detail above, according to the first invention,First and second light sources that irradiate light from the right and left diagonal fronts of the eye of the subject wearing the naked eye or glasses, and third and fourth that irradiate light from diagonally upwards of the right and left, respectively. And a lighting control unit for simultaneously lighting the first and fourth light sources during the first shooting period and simultaneously lighting the second and third light sources during the second shooting period.have. As a result, it is possible to avoid spectacle reflection even if the light source is arranged near the photographing optical axis, and the iris photographing apparatus can be miniaturized.In addition to the effect, it is possible to shoot an iris image without the influence of spectacle reflection on the left and right glasseseffective.
[0088]
  According to the second invention,First and second light sources that irradiate light from the right and left diagonal fronts of the eye of the subject wearing the hard contact lens, and third and fourth that irradiate light from the upper right and left diagonally, respectively. And a lighting control unit for simultaneously lighting the first and third light sources during the first shooting period and simultaneously lighting the second and fourth light sources during the second shooting period. Thereby, an iris image without a shadow of the left and right hard contact lenses can be photographed with a small photographing device.
[0089]
  According to the third aspect of the invention, the first and second light sources that irradiate light from the right and left oblique fronts of the subject's eyes, respectively, and the third and the third light sources that irradiate light from the right and left obliquely upward directions, respectively. A fourth light source;In the first to fourth shooting periods, the first to fourth light sources are sequentially combined so as to eliminate the influence of the left and right eyeglass reflections and the left and right hard contact lens shadows.A lighting control unit for lighting is provided. ThisA small photographic device that reflects the reflections of glasses and shadows of hard contact lenses.It is possible to shoot an iris image without any.
[0090]
  4thAnd fifthAccording to the invention ofBased on the designation of the first or second shooting mode, a lighting control unit for sequentially lighting the first to fourth light sources in combination so as to eliminate the influence of left and right eyeglass reflections or left and right hard contact lens shadows Have. Thereby, the photographing time can be shortened as compared with the third invention.
[0091]
  First6According to the invention ofThe lighting control unit according to the first to fifth aspects of the invention is configured to sequentially switch the first to fourth light sources according to each shooting period to repeatedly turn on, and the shooting unit is switched every time the light source is switched by the lighting control unit. An image selection unit is provided that repeatedly captures the subject's iris and selects an iris image suitable for generating an iris code from among a plurality of iris images held in the image storage unit. As a result, a plurality of iris images are obtained, and inappropriate iris image data such as spectacle reflection is excluded from the plurality of iris images, thereby reducing the load of the subsequent recognition processing.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of an iris photographing apparatus showing a first embodiment of the present invention.
FIG. 2 is an explanatory diagram of a conventional iris photographing apparatus and its problems.
FIG. 3 is an explanatory diagram showing a relationship between a light source arrangement and a captured image in FIG.
4 is a flowchart showing the operation of FIG. 1. FIG.
FIG. 5 is a configuration diagram of an iris photographing apparatus showing a second embodiment of the present invention.
6 is a flowchart showing the operation of FIG.
[Explanation of symbols]
L1-L4 light source
10 Image sensor
20 lighting switching part
30 Focus detector
40 Image storage
50 Image output unit
60,60A control unit
61, 62 switch
70 Audio output unit

Claims (6)

First and second light sources for irradiating light to the iris part of the subject to be photographed from the right side and the left side of the subject's eye wearing the naked eye or glasses;
Third and fourth light sources for irradiating light to the iris part of the subject to be photographed from diagonally above the right and left sides of the subject's eyes,
The first and fourth light sources are turned on at the same time assuming that the left eye of the subject is photographed during the first photographing period, and the right eye of the subject is photographed during the second photographing period. A lighting control unit for simultaneously lighting the second and third light sources;
A photographing unit that photographs the iris of the subject illuminated by the light source lit by the lighting control unit ;
An iris photographing apparatus characterized by comprising. A first light source and a second light source for irradiating light to an iris portion of a subject to be photographed from the right side and left side of the subject's eye wearing a hard contact lens;
Third and fourth light sources for irradiating light to the iris part of the subject to be photographed from diagonally above the right and left sides of the subject's eyes,
The first and third light sources are turned on at the same time assuming the left eye of the subject to be photographed during the first photographing period, and the right eye of the subject is assumed to be photographed during the second photographing period. A lighting control unit for simultaneously lighting the second and fourth light sources;
A photographing unit that photographs the iris of the subject illuminated by the light source lit by the lighting control unit ;
An iris photographing apparatus characterized by comprising. A first light source and a second light source for irradiating light to an iris part of a subject to be photographed from diagonally forward on the right side and left side of the eye of the subject,
Third and fourth light sources for irradiating light to the iris part of the subject to be photographed from diagonally above the right and left sides of the subject's eyes,
The first light source and the fourth light source are turned on at the same time assuming that the left eye of the subject wearing the naked eye or glasses is photographed during the first photographing period, and the naked eye or glasses are worn during the second photographing period . The second and third light sources are turned on at the same time assuming that the subject's right eye is shot, and the left eye of the subject wearing the hard contact lens is assumed during the third shooting period. A lighting control unit that turns on the first and third light sources at the same time and lights the second and fourth light sources at the same time in the fourth shooting period assuming shooting of the right eye of the subject wearing the hard contact lens. When,
A photographing unit that photographs the iris of the subject illuminated by the light source lit by the lighting control unit;
An iris photographing apparatus characterized by comprising. A first light source and a second light source for irradiating light to an iris part of a subject to be photographed from diagonally forward on the right side and left side of the eye of the subject,
Third and fourth light sources for irradiating light to the iris part of the subject to be photographed from diagonally above the right and left sides of the subject's eyes,
When the first shooting mode indicating the naked eye or the spectacle wearer is designated, the first and fourth light sources are turned on simultaneously in the first shooting period assuming the shooting of the left eye of the subject. When the second photographing mode indicating the wearer of the hard contact lens is designated by assuming that the right eye of the subject is photographed during the second photographing period and simultaneously turning on the second and third light sources. Assumes that the left eye of the subject is to be photographed during the first photographing period, and simultaneously turns on the first and third light sources, and photographs the right eye of the subject during the second photographing period. a lighting control unit for assuming to light the second and fourth light sources at the same time,
A photographing unit that photographs the iris of the subject illuminated by the light source lit by the lighting control unit;
An iris photographing apparatus characterized by comprising. 5. The iris photographing apparatus according to claim 4, further comprising a switch for designating the first photographing mode or the second photographing mode . The lighting control unit is configured to sequentially switch and repeatedly turn on the first to fourth light sources according to the shooting periods, and the shooting unit is configured to switch the light source every time the lighting control unit switches the light sources. An image storage unit configured to repeatedly shoot the photographer's iris and holding a plurality of image data of the subject's iris imaged by the imaging unit, and a plurality of images stored in the image storage unit 6. The iris photographing apparatus according to claim 1, further comprising an image selection unit that selects an image data suitable for generating an iris code from among the image data .

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