KR20050000154A - Apparatus for acquiring an iris image - Google Patents

Abstract

PURPOSE: A device for obtaining an image of two irises with one imaging device is provided to reduce wrong recognition without an extra expense by obtaining the image of two irises through one imaging device. CONSTITUTION: The first and the second object lens(210a,210b) receive the iris images through the first and the second optical path. The first/second/third full reflection glasses(250a,250b,250c) reflect the iris image inputted through the object lenses to a direction to a beam splitter(240). As a glass(240) comprising an upper half of the full reflection glass and a lower half of the penetration glass is diagonally arranged, the beam splitter combines the two iris images by passing the iris image of the first optical path and reflecting the iris image of the second optical path. A CCD(Charge Coupled Device) camera(260) pictures the images of the first and the second optical path passing an image collecting device(200).

Description

Iris image acquisition device {Apparatus for acquiring an iris image}

The present invention relates to an iris image acquisition device for acquiring an iris shape of two eyes using one imaging device. More particularly, when an iris image of two eyes is input through a first optical path and a second optical path, An image converging means for converging the input image of the first optical path and the second optical path by passing through each objective lens into a single image and focusing on the front of the image acquiring means so that an iris image of two eyes can be obtained even with one imaging device. It relates to an iris image acquisition device capable of obtaining.

In general, biometric technologies for identifying or recognizing individuals include fingerprint recognition technology, face recognition technology, and iris recognition technology, which identify individual characteristics of each individual through imaging and analysis.

In iris recognition technology, the iris is the inner part of the black masturbator of the eye, which is the outer part of the pupil, and is composed of muscles that control the opening and closing of the pupil. These irises are the muscles that control the amount of light that enters the eye from the outside world. The eyes of ordinary people are formed until 6 months of pregnancy, and at that point, it is known to occur as a chaotic phase toward the outside of the retina of the weight. have. The growth of this weight usually results in features that stop growing after a few years and form their own patterns that do not change over time. In this pattern, the iris is formed differently in the left and right eyes of the same person, and there is a difference in identical twins.

As a conventional iris image extraction technology, Korean Patent Application No. 2000-62539 (Publication No. 2002-7923) places its own iris at a mark point of a translucent mirror installed in front of an acquisition means. After matching, the camera moves forward to focus and acquires an iris image by capturing a user's iris in real time.

A translucent mirror 10 having a display point 12 is installed at a point where the focal axis of the iris and the fixed camera 20 is coincident, and when the user places his or her iris at the display point 12, the camera Coincides with the focal axis of (20). In addition, the focus of the camera 20 is that the user moves forward while the iris is positioned at the display point 12 to see the light of the indicator 40 in the perforated configuration of the slit 30 under the translucent mirror 10. Set the position of the slit so that the obtained iris image of the camera is clear when it reaches a possible position. In addition, the camera 20 captures the user's iris in real time to obtain a clear iris image in focus and use it for identification.

However, since the conventional iris recognition system targets only one eye of the iris, if erroneous recognition occurs when acquiring an iris image, it takes a lot of time because the iris must be repeatedly photographed until the correct iris image is acquired. There are disadvantages.

In addition, when the iris images of both eyes are captured by one camera, not only a complicated process for separating each iris image from the captured image is required, but also the exact focus axis is difficult to match and the captured image is not clear. This causes a problem of increasing the false recognition rate.

In addition, when two cameras are used to acquire iris images of both eyes, the cost increases and thus the competitiveness of the product decreases.

Accordingly, an object of the present invention is to provide an iris image acquisition device that does not require additional cost while lowering a false recognition rate by acquiring an iris shape of two eyes using one imaging device.

In order to achieve the above object, the iris image acquisition device of the present invention, the objective lens and the iris image is incident to the first optical path and the second optical path, the total reflection glass for reflecting the iris image incident through the objective lens, An image focusing apparatus comprising a beam splitter that combines two iris images by transmitting an iris image of a first optical path and an iris image of a second optical path among the images of the first optical path and the second optical path reflected from the total reflection glass. And image pickup means for picking up images of the first and second optical paths that have passed through the image focusing apparatus.

1 is a conventional iris image acquisition device

Figure 2 is an internal configuration of the iris image acquisition device according to the present invention.

3 is a block diagram of a beam splitter according to the present invention;

4a and 4b are embodiments of the combined image according to the present invention.

* Description of the symbols for the main parts of the drawings *

200: image focusing apparatus 210: first and second objective lens

220: third objective lens 230: correction lens

240: beam splitter 250: total reflection glass

260: imaging device

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described using drawing.

In the iris image acquisition device of the present invention, as shown in Figs. It consists of. In the image focusing apparatus, a first objective lens 210a and a second objective lens 210b are disposed in which an iris image of two eyes is incident along a first optical path and a second optical path. Located in a straight line, the first total reflection glass 250a reflects an incident iris image at right angles to the beam splitter 240 in a direction spaced apart from the beam splitter 240, and is positioned in a straight line with the second objective lens 210b. The second total reflection glass 250b is disposed to reflect the incident iris image at right angles to the beam splitter 240. In this case, the iris image reflected from the first total reflection glass 250a and the second total reflection glass 250b is reflected along the axis shifted by a predetermined distance.

The third total reflection glass 250c is disposed in a line with the first total reflection glass 250a and is disposed to reflect the reflected iris image at right angles back to the beam splitter direction. The iris image reflected from the third total reflection glass 250c and the iris image reflected from the second total reflection glass 250b are combined in the beam splitter 240, and the beam splitter has a glass 241 disposed on a diagonal line. The upper half of the glass 241 has a total reflection glass 241b structure in which aluminum coating is applied to totally reflect the image, and the lower half of the glass 241 has a transmission glass 241a structure for transmitting the image.

The iris image reflected from the third total reflection glass 250c is incident on the beam splitter 240 and transmitted by the transmission glass 241a, and the iris image reflected from the second reflection glass 250b is reflected on the beam splitter 240. It is incident and reflected by the total reflection glass 241b. The output image of the beam splitter 240 is combined and output as one image as shown in FIG. The image pickup device 260 disposed in line with the beam splitter 240 may capture the output image and acquire an iris image of two eyes in one image pickup device.

In this case, the output image passes through the third objective lens 220 and is incident to the imaging device 260. The objective lens 220 overlaps the images of the first and second optical paths passing through the beam splitter 240. Focusing on the mating surface of the place to perform the function to make the mating surface clear. 4B illustrates a combined image when the objective lens 220 is not used.

In addition, when the beam splitter 240 is positioned at the central point of the image incident from the first optical path and the image incident from the second optical path, the beam splitter 240 is combined with the image of the first optical path and the second optical path by an equal ratio. When the beam splitter 240 is moved left and right, the split ratio of the screen when the image of the first optical path and the second optical path are combined is changed according to the degree of movement. 4 (a) shows a combined image combined with a split ratio of 45:55 by moving the beam splitter 240.

Subsequently, between the first total reflection glass 250A and the third total reflection glass 250c and between the second total reflection glass 250b and the beam splitter 240, the first correction lens 230a and the second correction lens 230b are provided. Each of them may be further disposed to correct and align the magnification and distance of the iris images reflected from the first total reflection glass 250a and the second total reflection glass 250b to obtain a clearer image. In this case, when the optical path blocking layer is disposed in place of the correcting lenses 230a and 230b, an image of an undesired optical path is blocked to obtain only a desired image.

As described above, the present invention combines the iris images of the two eyes into one image by using the image focusing apparatus and captures them with one imaging device, so that accurate authentication through the iris is possible, thereby lowering the incidence of false recognition. Since the iris image of both eyes is captured by using one camera, the price of the product is low and the competitiveness of the product is improved.

Claims (5)

First and second objective lenses 250a and 250b into which the iris image is incident on the first and second optical paths; First, second and third total reflection glasses 250a, 250b and 250c for reflecting the iris image incident through the first and second objective lenses in a direction in which the beam splitter 240 is positioned; The upper half is the total reflection glass 241b, and the lower half is the glass 240 made of the transmissive glass 241a, and is disposed on a diagonal line, and among the iris images of the first optical path and the iris image of the second optical path reflected from the total reflection glass A beam splitter 240 for transmitting the iris image of the first optical path and reflecting the iris image of the second optical path to combine the two iris images; Image focusing device consisting of 200, And an image pickup device 260 for picking up images of the first and second optical paths passing through the image focusing device 200, and using the single image pickup device 260, to obtain an iris image of two eyes. Iris image acquisition device. According to claim 1, The third objective lens 220 to make the coupling surface clear by focusing the coupling surface where the image of the first and second optical paths passing through the beam splitter 240 overlaps. Iris image acquisition device, characterized in that it further comprises. The method according to claim 1 or 2, Iris image acquisition device characterized in that to adjust the split ratio of the screen when combining the image of the first optical path and the second optical path by moving the beam splitter 240 left and right. The method according to claim 1 or 2, Iris image acquisition device, characterized in that for additionally arranged to correct and align the magnification and distance of the iris image reflected from the total reflection glass (250a, 250b). The method according to claim 4, An iris image acquisition device, characterized in that it is possible to obtain only a desired image by blocking an unwanted image by placing an optical path blocking film instead of the correction lens.