KR101032499B1 - Iris Recognition System Using CCD Filter and Iris Recognition Method Using The Same - Google Patents

Abstract

The present invention discloses an iris recognition system using a CCD filter and an iris recognition method using the same. An iris recognition method using a CCD filter according to the present invention includes the steps of acquiring an iris image by simultaneously lighting illumination having different wavelengths; Separating the obtained iris image into wavelength bands by using a CCD filter; Obtaining responsiveness of the iris images separated by the wavelength bands; It is characterized in that it comprises the step of attempting iris recognition by iris coding the iris image obtained in each of the wavelength range.

The iris recognition system using the CCD filter and the iris recognition method using the same according to the present invention, by separating the iris image obtained by lighting the two different wavelength bands at the same time by the CCD filter by separating the iris image by wavelength band, by detecting the reactivity Iris recognition can be performed faster.

Iris image, response degree, iris code

Description

Iris Recognition System Using CCD Filter and Iris Recognition Method Using The Same {SYSTEM AND THE METHOD FOR IRIS RECOGNITION USING OF CCD FILER}

1 is a view schematically showing the configuration of a general iris recognition system.

2 is a view schematically showing the configuration of an iris recognition system using a CCD filter according to the present invention.

Figure 3 is a flow chart showing the iris recognition method using a CCD filter according to the present invention.

4 schematically shows the structure of a CCD filter according to the present invention;

<Description of the symbols for the main parts of the drawings>

203 --- Camera 204 --- Frame Grabber

205 --- Controller 206 --- Lighting

210 --- Database 211 --- CCD Filter

The present invention relates to an iris recognition system using a CCD filter and an iris recognition method using the same. Particularly, an iris image obtained by simultaneously lighting two different wavelength bands is separated from the iris image by wavelength band by a CCD filter, and then reactivity is measured. The present invention relates to an iris recognition system using a CCD filter that can perform iris recognition more quickly by detecting the iris recognition method using the same.

As is known, it is a system for security, crime prevention, and identity authentication. It goes beyond the existing contact or contactless card system to recognize human fingerprints, or to authenticate identity through iris recognition and access to specific places or access to specific information. Systems to allow or deny such have been prevalent.

Among them, the iris recognition system has a high recognition rate and more accurate recognition than the fingerprint recognition. The iris recognition system is a system that authenticates an individual by comparing a characteristic pattern of an iris with an image processing technology in an iris image captured by a video camera and comparing it with previously registered iris data.

FIG. 1 is a diagram schematically illustrating a configuration of a general iris recognition system. Referring to FIG. 1, an operation of an iris recognition system is as follows.

When the user approaches the iris recognition system, the distance measuring sensor 109 measures the distance to the user, and the controller 105 receives the distance measurement value obtained through the driver 107 to operate the distance measurement value. Determine if you are in range.

If the user is within the operating range, a control signal is sent to the driver 107 to prepare to extract the iris image. The driver 107 sends an active signal to the external indicator 108 to inform the user that the system is operating. Accordingly, when the user places the eye on the optical axis of the camera 103 through the optical window 101, the cold mirror ( 102 blocks visible light and passes infrared light. In addition, the part where the iris should be positioned is displayed so that the user can check whether the eye is located on the optical axis of the camera 103.

The controller 105 receives the distance measurement value from the distance measurement sensor 109 to the user, and calculates the zoom and focus values of the camera 103 using the distance measurement value to perform zoom in / zoom out and focusing control. Perform. Thereafter, the controller 105 allows the driver 107 to capture the iris image according to the distance measurement value, and the photographed iris image is signal-processed in the frame grabber 104 for iris image analysis, and the processed iris is processed. The image information is stored in the DB (database) 110, and the controller 105 performs iris recognition with the stored information to determine whether the user is authenticated.

On the other hand, in such an iris recognition system, the performance depends on how fast and how accurately the iris recognition is performed. In addition, in the general iris recognition system of the art, the reflection problem caused by glasses may occur when using a single light source so that the secondary reflection caused by the glasses can be avoided by using a plurality of lights to solve this problem. The image may be acquired by changing the position of the light.

However, in the above method, if recognition is denied in processing iris recognition, the image of the iris is extracted again, the position of the pupil is found, and the iris area is coded and attempted to take a long time, and the accuracy is also low. Is generated.

According to the present invention, an iris image obtained by lighting two different wavelength bands at the same time and separating an iris image for each wavelength band by a CCD filter, and then detecting the reactivity, an iris recognition using a CCD filter capable of performing iris recognition faster. Its purpose is to provide a system and an iris recognition method using the same.

Iris recognition system using a CCD filter according to the present invention to achieve the above object,

A distance measuring sensor measuring a distance from the user to perform iris recognition;

An illuminator for lighting two lights of different wavelength bands at the same time after the distance is adjusted by the distance measuring sensor;

A camera for photographing an iris image after two lights having different wavelength bands are turned on at the same time by the lighting unit;

It is characterized in that it comprises a CCD filter for separating the iris image of the user taken by the camera for each wavelength band.

In particular, the CCD filter is characterized by having a wavelength band of L and S.

In particular, the L and S wavelength bands of the CCD filter are characterized in that they have 700 nm band and 800 nm band.

In addition, the iris recognition method using a CCD filter according to the present invention to achieve the above object,

Simultaneously lighting up lights having different wavelengths to obtain an iris image;

Separating the obtained iris image into wavelength bands by using a CCD filter;

Obtaining responsiveness of the iris images separated by the wavelength bands;

It is characterized in that it comprises the step of attempting iris recognition by iris coding the iris image obtained in each of the wavelength range.

In particular, the iris-coded iris image is characterized in that it further comprises the step of storing in a database.

In particular, the method may further include obtaining a difference image of the iris images separated by the wavelength bands.

Here, in particular, the illumination having different wavelengths is characterized in that the illumination having a wavelength in the 700 nm band and the wavelength in the 800 nm band.

Here, in particular, in the step of separating the image for each of the wavelength band is characterized by using the reactivity of the wavelength band for the L, S of the CCD filter.

Here, in particular, in the step of obtaining the responsiveness of the iris images separated by the wavelength band, an iris region is extracted from the iris image obtained by the illumination having the wavelength of 700 nm, and in the iris image obtained by the illumination having the wavelength of 800 nm, The feature is that the pupil area is extracted.

Here, in particular, it is characterized in that the model is determined using the reactivity of the iris images separated by the wavelength band.

According to the present invention, iris recognition can be performed more quickly by separating iris images obtained by simultaneously lighting two different wavelength bands and obtaining respective reactivity.

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

2 is a view schematically showing the configuration of the iris recognition system using a CCD filter according to the present invention, the operation of the iris recognition system with reference to the bar shown in FIG.

When the user approaches the iris recognition system, the distance measuring sensor 209 measures the distance with the user, and the distance measurement value is thus received by the control device 205 through the driver 207 to operate the distance measurement value. Determine if you are in range.

If the user is within the operating range, a control signal is sent to the driver 207 to prepare to extract the iris image. The driver 207 sends an active signal to the external indicator 208 to inform the user that the system is operating. Accordingly, when the user places the eye on the optical axis of the camera 203 through the optical window 201, the cold mirror ( 202 blocks visible light and passes infrared light. At this time, the illumination device 206 irradiates two lights using infrared rays having different wavelength bands at the same time.

Then, the part where the iris should be positioned is displayed so that the user can check whether the eye is located on the optical axis of the camera 203.

Then, the controller 205 receives the distance measurement value from the distance measurement sensor 209 to the user, and calculates the zoom and focus values of the camera 203 using the distance measurement value to perform zoom in / zoom out and focusing control. Perform. Subsequently, the controller 205 captures the iris image through the driver 207 according to the distance measurement value, and separates the iris image by the wavelength band from the iris image captured by the CCD filter 211.

Then, the signal is processed in accordance with the analysis of the responsiveness of the iris image in the frame grabber 204, and stores the processed iris image information in the DB (database) 210, the control device 205 with the stored information Will perform iris recognition to determine whether the user is authenticated.

An iris recognition method using a CCD filter according to the present invention will be described with reference to FIG. 2.

3 is a flowchart illustrating an iris recognition method using a CCD filter according to the present invention. As shown in FIG. 1, first, an iris image is acquired by simultaneously lighting lights having different wavelengths (S301).

First, when the user places an eye on the optical axis of the camera 203 through the optical window 201 to recognize the iris in the iris recognition system, the lighting device with two lights having different wavelength bands simultaneously turns on the user's eyes. Light the iris

When two lights having different wavelength bands are turned on at the same time, the distance sensor 209 measures the distance between the camera 203 and the user, outputs continuous distance information, and grasps the operating characteristics of the user. The focus is adjusted to acquire an iris image.                     

The illumination having different wavelengths is provided with illumination having a wavelength of 700 nm and illumination having a wavelength of 800 nm.

Therefore, the iris image acquired by simultaneously lighting the illumination having the different wavelengths is obtained with the iris sum image for the wavelength of 700 nm and the wavelength of 800 nm.

Subsequently, the obtained iris image is separated by the wavelength band using the CCD filter 211 (S302).

4 is a view schematically showing the structure of a CCD filter according to the present invention. As shown in the figure, the CCD filter is formed of alternating cells of L and S, respectively. At this time, L has a wavelength of 700 nm, S has a wavelength characteristic of 800 nm.

Here, L and S have different reactivity.

Next, the step of obtaining the reactivity of the iris images separated by the wavelength band is performed (S303).

In more detail, it can be seen that the response degree of the iris image acquired by the illumination having the wavelength of 700 nm and the illumination having the wavelength of 800 nm is differently detected.

V (L) = Rf (700) * I ₇₀₀ (L) + Rf (800) * I ₈₀₀ (L)

V (S) = Rf (700) * I ₇₀₀ (S) + Rf (800) * I ₈₀₀ (S)

Where V (L) and V (S): L and S filter values obtained in each cell CELL;

Rf 700: reflectivity of the 700 nm illumination zone of the object;                     

Rf 800: reflection of an 800 nm illumination zone of an object;

I ₇₀₀ (L), I ₇₀₀ (S): sensitivity of each L, S filter of 700 nm illumination stage;

I ₈₀₀ (L), I ₈₀₀ (S): Sensitivity of each L, S filter for 800 nm lamp.

By using the above equation, Rf (700) and Rf (800), which are reflectivity of the object, are obtained. That is, the response of each of the pupils, the irises, and the whites in the iris image is obtained.

In the iris image obtained by the illumination in the wavelength range of 700 nm, the degree of response to illumination in the white region and the iris region of the iris image is changed, and the boundary becomes clear. At this time, the reaction degree is similar to the iris area and the pupil area, and the boundary is blurred.

Therefore, in the iris image obtained by the illumination in the wavelength band of 700 nm, it is used to find the iris region when performing iris recognition.

In the iris image obtained by the illumination in the wavelength band of 800 nm, the degree of response to the illumination of the white part and the iris part is similar, and the boundary is blurred. At this time, the reaction degree is different with respect to the iris area and the pupil area, the boundary becomes clear.

Therefore, the iris image acquired by the illumination in the wavelength range of 800 nm is used to find the pupil when performing iris recognition.

In this case, the frame grabber 204 may define different reaction degrees with respect to the difference between the two iris images.

On the other hand, here, in particular, it is possible to obtain a difference image for the iris images separated by the wavelength band. In this case, since the difference image is obtained from an iris image separated from one acquired iris image, motion correction is not necessary.

Accordingly, the difference image of the iris image of the wavelength range of 700 nm in the iris image of the wavelength range of 800 nm obtains the difference image of the same position.

In addition, the degree of response of the iris image is also detected with respect to the difference image obtained by the frame grabber 204.

Subsequently, an iris-coded iris image obtained in each of the wavelength bands is attempted to recognize the iris (S304).

More specifically, the iris-coded difference image and iris image are previously stored in a database through a user registration process, and the iris recognition is performed by comparing and comparing the difference image and iris image stored in the database. .

In addition, the dummy eye is discriminated by determining the detected response degree according to the wavelength range of the obtained difference image and iris image.

Although the present invention has been described with reference to the embodiments illustrated in the drawings, this is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

The iris recognition system using the CCD filter and the iris recognition method using the same according to the present invention, by separating the iris image obtained by lighting the two different wavelength bands at the same time by the CCD filter by separating the iris image by wavelength band, by detecting the reactivity Iris recognition can be performed faster.

Claims (11)

A distance measuring sensor measuring a distance from the user to perform iris recognition; An illuminator for lighting two lights of different wavelength bands at the same time after the distance is adjusted by the distance measuring sensor; A camera for photographing an iris image after two lights having different wavelength bands are turned on at the same time by the lighting unit; A CCD filter for separating an iris image of the user photographed by the camera for each wavelength band; A frame grabber for detecting responsiveness of the separated iris image; A database for storing information on the detected reactivity; A control device for determining iris recognition according to the detected reactivity; Iris recognition system using a CCD filter, characterized in that it comprises a driver for controlling the zoom or focus of the camera. delete The method of claim 1, The CCD filter has a wavelength band of L and S, the iris recognition system using a CCD filter. The method of claim 1, L, S wavelength band of the CCD filter has a 700nm band and 800nm band, iris recognition system using a CCD filter. Simultaneously lighting up lights having different wavelengths to obtain an iris image; Separating the obtained iris image into wavelength bands by using a CCD filter; Obtaining responsiveness of the iris images separated by the wavelength bands; An iris recognition method using a CCD filter, characterized in that the iris code is obtained by iris coding the iris image obtained in each of the wavelength range. The method of claim 5, The iris coded iris image further comprises the step of storing in a database iris recognition method using a CCD filter. The method of claim 5, Iris recognition method using a CCD filter, characterized in that further comprising the step of obtaining a difference image for the iris images separated by the wavelength band. The method of claim 5, The illumination with different wavelengths is an iris recognition method using a CCD filter, characterized in that the illumination having a wavelength of 700nm band and 800nm band. The method of claim 5, Iris recognition method using a CCD filter, characterized in that using the reactivity of the wavelength band to the L, S of the CCD filter in the step of separating the image by the wavelength band. The method of claim 8, In the step of obtaining the responsiveness of the iris images separated by the wavelength band, an iris region is extracted from the iris image obtained by the light having the wavelength of 700 nm, and the pupil region is extracted from the iris image obtained by the light having the wavelength of 800 nm. Iris recognition method using a CCD filter, characterized in that the extraction. The method of claim 5, Iris recognition method using a CCD filter, characterized in that the imitation eye is determined using the reactivity of the iris images separated by the wavelength band.

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