KR101767941B1

KR101767941B1 - Dual camera device for iris identification and normal photographing

Info

Publication number: KR101767941B1
Application number: KR1020160003333A
Authority: KR
Inventors: 성주현; 공정석; 정준용; 임상덕
Original assignee: 에이치엔티 일렉트로닉스(주)
Priority date: 2016-01-11
Filing date: 2016-01-11
Publication date: 2017-08-14
Also published as: KR20170083884A

Abstract

The combined camera capable of general photographing and iris recognition photographing according to the embodiment of the present invention is composed of a first lens L1 and a second lens L2 in a general photographing mode and an iris recognition photographing mode, A camera lens module including a wide-angle converter optical system having a filter for blocking an infrared region, a dual bandpass filter through which a visible light region and an infrared region pass through a third lens (L3) module, And a driving unit for selectively moving the camera lens module to an upper portion of the camera lens module according to the mode.

Description

Technical Field [0001] The present invention relates to a dual camera device for iris identification and normal photographing,

More particularly, the present invention relates to a camera having a simple structure and a camera for both general photographing and iris photographing for selectively photographing an image of a normal visible light wavelength band and an infrared wavelength band for iris recognition .

Recently, there have been a lot of cases in which biometrics technology, which verifies the identity of an individual using human physical characteristics, is applied mainly to access control systems and computer security systems. Recently, however, the range has been gradually expanded, such as iris recognition, speech recognition, and vein recognition.

In particular, the iris surrounding the pupil of the eye is known to have individual characteristics such that identical twins have completely different patterns, and the distinguishing power is much superior to the fingerprints. Thus, the application of iris recognition technology is greatly increased.

A process of acquiring an image of an iris by using an optical system, a process of generating an iris code by extracting features from the image data of the iris, a process of comparing the generated iris code with the stored iris code .

On the other hand, in order to accurately extract the feature by processing the iris image by software, the image formed on the image sensor of the camera module should normally be 200 pixels or more in the vertical direction when the iris diameter is 11 to 12 mm and the object distance is 300 mm It is known.

Since the pixel size of the smallest (1/10 inch) VGA sensor (640 * 480) is 2.25 μm, the size of 200 pixels is 0.45 mm, and the magnification of the optical system is 0.0375 times as compared with the iris size 12 mm. Therefore, in order to obtain a satisfactory image by photographing the iris at a distance (about 300 mm) at which the user does not feel a great inconvenience to the photographing, it is necessary to implement more than this magnification based on the VGA class sensor.

The iris recognition optical system captures an image using a narrow angle of view, and the infrared region is also required for iris recognition. As a result, if a normal image is shot, a red image is captured due to the blocking of infrared rays. As a result, it is necessary to change the structure of the infrared filter and the angle of view of the lens, which are conventionally used, so that general photography can be performed.

It is an optical system to be mounted in a conventional security device. Although such a large electric field is not a big problem, it is impossible to install such an optical system in a portable electronic device such as a smart phone, a tablet PC, a notebook or the like whose thickness is thinner than 10 mm.

In conclusion, the conventional iris recognition camera has a problem in that iris can be photographed only by using an optical system which blocks only the infrared region and has a narrow angle of view and a long field. In the case of a conventional general photography camera for mobile, Iris recognition can not be performed because a filter module capable of blocking only the visible light region is provided.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve the above-mentioned problems occurring in the prior art, and it is an object of the present invention to provide an iris recognition system and a general imaging mode, A tablet PC, a notebook computer, and the like.

According to another aspect of the present invention, there is provided a camera for operating a general imaging mode and an iris recognition imaging mode, including a first lens (L1) and a second lens And a dual bandpass filter through which a visible ray region and an infrared ray region pass through a third lens (L3) module, and a second lens barrel And a driving unit for selectively moving the wide-angle converter optical system to an upper portion of the camera lens module according to a selected photographing mode.

As described above, according to the present invention, it is possible to selectively perform the iris recognition shooting mode and the general imaging mode with a single camera device and to implement the iris recognition camera in a small size, , A tablet PC, a notebook computer, and the like.

1 is a perspective view showing a combined camera capable of general photographing and iris recognition photographing according to an embodiment of the present invention.
2 is a side sectional view of a combined camera capable of general photographing and iris recognition photography according to an embodiment of the present invention.
3 is a side cross-sectional view of a camera lens module 100 according to an embodiment of the present invention.
4 is a side cross-sectional view of a wide-angle converter optical system 200 according to an embodiment of the present invention.
5 is an optical system side elevational view of a combined camera capable of general photographing and iris recognition photography according to an embodiment of the present invention.
6 is a flowchart illustrating an operation flow of a combined camera capable of general photographing and iris recognition photographing according to an embodiment of the present invention.
7 is a graph showing spectral characteristics of the dual bandpass filter of the present invention.
8 is a graph showing spectral characteristics of the infrared ray transmitting filter of the present invention.
9 is a graph showing spectral characteristics of the infrared cut filter of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In the following description of the embodiments of the present invention, descriptions of techniques which are well known in the technical field of the present invention and are not directly related to the present invention will be omitted. In addition, detailed description of components having substantially the same configuration and function will be omitted.

For the same reason, some of the elements in the accompanying drawings are exaggerated, omitted, or schematically shown, and the size of each element does not entirely reflect the actual size. Accordingly, the present invention is not limited by the relative size or spacing depicted in the accompanying drawings.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a combined camera capable of general photographing and iris recognition photography according to the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view of a combined camera capable of general photographing and iris recognition photography according to an embodiment of the present invention, FIG. 2 is a side sectional view of a combined camera capable of general photographing and iris recognition photographing according to an embodiment of the present invention FIG. 3 is a side cross-sectional view of a camera lens module 100 according to an embodiment of the present invention, FIG. 4 is a side cross-sectional view of a wide-angle converter optical system 200 according to an embodiment of the present invention, Is an optical system side view diagram of a combined camera capable of general photographing and iris recognition photographing according to the example.

FIG. 7 is a graph showing the spectral characteristics of the dual bandpass filter of the present invention, FIG. 8 is a graph showing spectral characteristics of the infrared ray transmitting filter of the present invention, and FIG. 9 is a graph showing the spectral characteristics of the infrared ray blocking filter of the present invention FIG.

In the structure of the camera lens module 100, a dual band pass filter (F1) through which both the visible ray region and the infrared ray region pass through the third lens (L3) module is applied to enable iris recognition. The camera lens module 100 transmits both infrared rays and visible rays having a view angle of 40 degrees and acquires an iris image at a distance of 300 mm.

Here, 300 mm is not a limited distance, and it is natural that it can be changed by changing the specification of the lens or the filter if necessary.

The image sensor I1 may use a charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS) image sensor capable of detecting the visible light wavelength band and the infrared wavelength band. The dual bandpass filter F1 transmits both the visible light wavelength band and the infrared wavelength band light as shown in the graph of FIG.

The wide angle converter optical system 200 is superimposed on the camera lens module 100 to block light in the infrared region and transmit only light in the visible light region.

Specifically, the wide-angle converter optical system 200 moves to the upper portion of the camera lens module 100 by the driving unit 300 according to an instruction of the control unit 500 according to the photographing mode. 1, the driving unit 300 moves the wide-angle converter optical system 200 to the upper position of the camera lens module 100, and in the iris recognition imaging mode, As shown in the figure, the wide angle converter optical system 200 moves the wide angle converter optical system 200 outward so that it does not overlap the upper part of the camera lens module 100.

This movement is made possible through rotation so as to be possible in a minimum space, and it can be realized through a linear reciprocating movement if necessary.

The wide-angle converter optical system 200 includes a first lens L1 and a second lens L2, and has a filter for blocking an infrared region. The first lens L1 has a positive refractive power from the optical system side and has a negative refractive power from the first lens L1 to the second lens L2 and a negative refractive power And the negative (-) side of the first lens L1 is a concave curved surface. In this case, the first lens L1 has a concave curved surface And the transmission surface of the second lens L2 has a convex positive refractive power.

The second transmitting surface S2 is a concave spherical surface and the third transmitting surface S3 is a convex spherical surface and the fourth transmitting surface S4 is a convex spherical surface, Is an aspherical surface.

Here, the third transmitting surface S3 of the second lens L2 is coated with a coating for blocking infrared rays, thereby blocking the infrared rays, and thus it is possible to perform a general photographing mode, that is, a function of a general camera module. The image of the visible light region passing through the second lens L2 is detected by the color image of the subject in the image sensor.

The second lens L2 blocks the light of the infrared wavelength band as shown in the graph of FIG.

Further, the additional optical system of the present invention has a condition that T / F > 0.5 when the total length of the optical system (distance from the first surface of the first lens L1 to the sensor surface) is T and the total focal length of the optical system is F can do. At this time, the first transmitting surface S1 may have a curved surface concave toward the object side.

The driving unit 300 is provided at one side of the camera lens module 100 and rotates the wide angle converter optical system 200 360 degrees on a plane above the camera lens module 100, May overlap the camera lens module 100 or may be rotated to move away from the camera lens module 100. The driving unit 300 can use a small electric motor or a piezo motor for such driving.

It is to be understood that the driving unit 300 may be disposed at various positions such as the top of the camera lens module 100, the interior of the camera module,

6 is a flowchart illustrating an operation flow of a combined camera capable of general photographing and iris recognition photographing according to an embodiment of the present invention.

In the combined camera capable of general photographing and iris recognition photographing according to the embodiment of the present invention, a user selects a camera photographing mode through a variety of input devices and then selects one of the general photographing mode and the iris recognition photographing mode .

The control unit 500 confirms the selected shooting mode in the same manner as described above (S610). When the iris recognition shooting mode is selected, only the camera lens module 100 having the third lens is used (S620) S630). At this time, the wide-angle converter optical system 200 does not overlap the upper part of the camera lens module 100. When the general photographing mode is selected, the wide-angle converter optical system 200 composed of the first lens and the second lens is superimposed on the upper part of the camera lens module 100 (S640), and an image of the visible light region is obtained (S650). Thereafter, the user is informed through the various output methods whether to switch the general photographing mode to the iris recognition mode.

As described in detail above, the present invention can selectively implement the iris recognition mode and the general image capture mode with a single camera device, and can be implemented in a small size, and thus can be implemented in small electronic devices such as a cell phone, a smart phone, a tablet PC, It is possible to mount it on the vehicle.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. , And are not intended to limit the scope of the present invention. It will be apparent to those skilled in the art that other modifications based on the technical idea of the present invention may be practiced without departing from the invention as set forth herein.

100: iris recognition camera module 200: wide angle lens
300: driving part L1: first lens
L2: second lens L3: third lens (iris recognition lens)
F1: Dual Band Pass Filter H1: Lens fixing housing
H2: Superstructure housing I1: Image sensor
P1: PCB S1: First transmission side
S2: second transmitting surface S3: third transmitting surface
S4: fourth transmission surface

Claims

A camera for operating a general imaging mode and an iris recognition imaging mode through a combined camera capable of general imaging and iris recognition imaging,
In order to enable the general photographing and iris recognition photographing
A wide angle converter optical system having a filter for blocking an infrared region;
A camera lens module having a dual bandpass filter through which a visible light region and an infrared region pass;
And a driving unit for selectively moving the wide-angle converter optical system to an upper portion of the camera lens module according to a selected photographing mode
The wide angle converter optical system includes a first lens L1 and a second lens L2 and a third transmissive surface S3 of the second lens L2 is coated with a coating for blocking infrared rays, In addition,
The first lens L1 has a positive refractive power from the optical system side and has a negative refracting power from the first lens L1 to the second lens L2, And the first transmitting surface formed around the optical axis of the object side surface of the first lens L1 is a convex positive refracting surface, -) side determines the negative (-) value of the concave curved surface, the transmitting surface of the second lens L2 has positive convex positive refraction,
The camera lens module includes a third lens (L3) and an image sensor (I1)
A dual bandpass filter through which a visible light region and an infrared region pass through the third lens L3 module and detects both a visible light wavelength band and an infrared wavelength band passing through the dual bandpass filter,
The image sensor I1 is a charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS) image sensor capable of detecting a visible light wavelength band and an infrared wavelength band,
Wherein the driving unit is provided on one side of the camera lens module and the wide angle converter optical system is rotated 360 degrees on a plane above the camera lens module or the wide angle converter optical system is overlapped with the camera lens module within a predetermined angle, To rotate,
And a control unit for controlling the optical system of the wide angle converter according to a photographing mode
When the iris recognition mode is selected after the selected imaging mode is selected, the control unit implements the iris recognition imaging mode by using only the camera lens module having the third lens, and when the general imaging mode is selected, Wherein the wide angle converter optical system consisting of the first lens and the second lens is superimposed on the upper part of the camera lens module to execute the normal photographing mode to execute the iris image taking mode and the general photographing mode in one camera. Combination camera that can shoot and iris recognition.

delete

The method according to claim 1,
Characterized in that the driving unit uses a small electric motor or a piezo motor for such driving.