KR101076322B1 - Method for discriminating the authenticity of paper money by using a contact image sensor - Google Patents

Abstract

The present invention relates to a method of judging the authenticity of a bill using a contact image sensor, and more particularly, in a contact image sensor having an RGB light source and an infrared light source therein, irradiating visible and infrared rays to the bill at the same time, By recognizing the result of the reaction of the special ink used in the banknote by the two light beams, it is possible to improve the discrimination power of the authenticity of the banknote by the method of determining the authenticity of the banknote by using a single light source and the reliability of the judgment result. It is about the authenticity judgment method of a banknote.

In the method for determining the authenticity of a bill using a contact image sensor according to the present invention, in the method of determining the authenticity of a bill using a contact image sensor having an RGB light source and an infrared light source therein, the visible image and the infrared ray are detected by the contact image sensor. And irradiating the banknote at the same time, the contact image sensor recognizes the information which appears in response to the plurality of simultaneously irradiated light rays (i.e., visible and infrared rays) with the special ink used in the banknote, and the central processing unit recognizes the contact image. Calculating a predetermined pattern value from the information recognized by the sensor, and comparing the predetermined pattern value with a reference pattern value of the original banknote for the plurality of beams irradiated by the central processing unit to determine the authenticity of the banknote. Characterized in that consists of.

Contact image sensor, RGB light source, infrared light source, forgery and alteration bill, special ink

Description

Method for discriminating the authenticity of paper money by using a contact image sensor}

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a diagram schematically showing the results of detecting a true banknote and a counterfeit / false bill according to the type of light source.

Figure 2 is a block diagram showing a system to which the method for determining the authenticity of bills using the contact image sensor according to an embodiment of the present invention is applied.

Figure 3 is a flow chart illustrating a method of determining the authenticity of bills using the contact image sensor according to the present invention.

Description of the Related Art [0002]

10 contact image sensor 12 RGB light source

14: infrared light source 20: central processing unit

22: temporary storage 30: database

40: display unit

The present invention relates to a method of judging the authenticity of a bill using a contact image sensor, and more particularly, in a contact image sensor having an RGB light source and an infrared light source therein, irradiating visible and infrared rays to the bill at the same time, By recognizing the result of the reaction of the special ink used in the banknote by the two light beams, it is possible to improve the discrimination power of the authenticity of the banknote by the method of determining the authenticity of the banknote by using a single light source and the reliability of the judgment result. It is about the authenticity judgment method of a banknote.

In general, various advanced technologies for preventing forgery and alteration are applied to securities such as banknotes or checks, and thus unique geological characteristics, background colors, surface characteristics, and ink characteristics appear.

The conventional methods for determining the authenticity of paper money using the inherent characteristics of paper money are described in detail. The method of precisely analyzing the shape, geological properties, or surface characteristics printed on paper money and the unique inks used in paper money It can be divided into the method of determining the authenticity by detecting the characteristics.

First of all, it is difficult to discern the authenticity of banknotes by precisely analyzing the shape or surface characteristics printed on the banknotes with the naked eye, tactile or magnifying glass such as a magnifying glass, microscope, etc. Micro lettering technology that can be checked on the surface, Intaglio printing technology that can be recognized with touch by printing convex letters or patterns, and watermarks that show hidden pictures when the light shines on the paper money. Use technology.

However, the method of judging the authenticity of banknotes through the precise analysis of banknotes as described above takes a lot of time in the precision analysis process and is problematic in applying to automated teller machines (ATMs), which are used by many people. In addition, due to the development of precision printing techniques such as copying and scanning, it is difficult to determine the authenticity of the banknote because the above-described characteristics can be implemented similarly to the original paper money.

Another conventional method of determining the authenticity of banknotes, the method of determining the authenticity by using the characteristics of the special ink used in the banknotes is mostly in a single color in the natural state, but irradiated with light having a wavelength of a special region such as ultraviolet rays or infrared rays In other words, magnetic reluctance (MR) varies depending on the nature of the color and the color that is different from the natural state by the energy corresponding to the wavelength, and the magnetic material contained inside. The property which has a value, or the property which brings about a change of color by the minute heat | fever applied to a banknote is used. Examples of the special ink having such characteristics include ultraviolet ink, infrared ink, magnetic ink and discolorable ink.

As described above, the conventional method of determining the authenticity of a banknote by using the unique properties of the special ink used in the banknote automatically recognizes the characteristics of each special ink, thereby making it easier to judge the authenticity than the above-described precision analysis method. And because of the speed of judgment, it can be used as a financial automation factor.

However, the method of judging the authenticity of banknotes using the unique properties of special ink has developed the printing and manufacturing techniques that mimic basic characteristics such as fluorescent ink that reacts to ultraviolet rays and infrared rays and magnetic ink that can be detected by magnetic sensors. Therefore, when judging the authenticity of banknotes using the characteristics of one special ink, there is a problem that the discrimination power of the authenticity judgment and the reliability of the judgment result are deteriorated. Therefore, a plurality of special ink, for example, ultraviolet ink and The authenticity of banknotes is determined using two or more special ink characteristics such as magnetic ink, infrared ink and magnetic ink, ultraviolet ink and infrared ink.

However, a method of determining the authenticity of a banknote by using the characteristics of a plurality of special inks also applies a banknote to a plurality of light sources used for determining the authenticity of the banknotes sequentially or repeatedly to the banknotes through the result of reacting to the respective light sources. In order to determine the authenticity of the device, the configuration of the device for determining the authenticity by applying such a method complicates the structure of the device, and it takes a long time for the recognition process because it recognizes a plurality of ink characteristics sequentially or repeatedly. Occurs.

In addition, when the reaction result of a banknote by one particular light source is not clear, there is a problem that may result in an incorrect judgment in determining the authenticity of the banknote.

The present invention is to solve the above problems. In other words, by using a contact image sensor having both an RGB light source and an infrared light source for irradiating monochromatic visible light at the same time, irradiating visible and infrared light to the bill at the same time and recognizing the reaction of the special ink used in the bill, The purpose is to obtain improved discrimination in judgment and reliability of accurate judgment results.

In addition, by simplifying the recognition process, it is possible to shorten the time required to determine the authenticity of banknotes, and to configure the device for the determination of the authenticity of banknotes more simply to use the device for financial automation equipment. There is this.

In order to achieve the above object, the authenticity method of the bill using the contact image sensor according to the present invention, in the method of determining the authenticity of the bill using a contact image sensor provided with an RGB light source and an infrared light source therein, Irradiating visible and infrared rays to the bill at the same time from the contact image sensor, and then recognizing, by the contact image sensor, a plurality of simultaneously irradiated rays (ie, visible and infrared rays) in response to the special ink used in the bill; Calculating, by the central processing unit, a predetermined pattern value from the information recognized by the contact image sensor, comparing the predetermined pattern value with the reference pattern value of the original banknote for the plurality of beams irradiated by the central processing unit; Characterized in that the step of determining the authenticity of the bill.

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

FIG. 1 is a diagram schematically illustrating a detection result of a true banknote and a forgery / falsification banknote according to a type of light source.

Referring to FIG. 1, a total of six detection results are shown, of which (a1), (b1), and (c1) of FIG. 1 are the detection results of true banknotes, and (a2), (b2) and (c2) is a detection result for a forgery and alteration banknote.

First, (a1) and (a2) of FIG. 1 show a result of irradiating general visible light to a bill and recognizing it through the contact image sensor 10.

Figure 1 (a1) is a result of irradiating visible light to the true banknote, Figure 1 is a result of the brightness value and the color value of the contrast value of the specific position in response to the visible light irradiated under the same conditions for the counterfeit and modulated bills There is no difference when compared with (a2).

That is, when the banknote is irradiated with monochromatic visible light, since the same detection result is obtained regardless of the authenticity of the banknote, the authenticity of the banknote cannot be determined.

1 (b1) and (b2) show the results when the bill is irradiated with infrared light alone. Here, since the contrast value shown in response to the infrared light source at the same specific position shows a difference, it becomes a criterion for determining the authenticity of the banknote.

However, the difference in contrast value cannot be compared with factors such as the preservation state of the banknote or the wavelength of the irradiated infrared rays, or the boundary of a specific region responding to the infrared rays may appear unclear.

1 (c1) and (c2) are diagrams showing the detection results obtained by irradiating a single wavelength of monochromatic visible light and infrared light on a bill at the same time.

(C1) of FIG. 1 is a detection result for true banknotes, and (c2) of FIG. 1 is a detection result for counterfeit banknotes. Compared with the results shown in (b1) and (b2) of Figure 1, since the authenticity of the bill can be determined based on the presence or absence of the contrast as well as the difference between the light and dark, the discriminating power is more apparent at a specific position, There is an advantage of having more reliability in authenticity judgment.

Therefore, the authenticity of the banknote can be determined using the authenticity determination method of the banknote using the contact image sensor according to the present invention.

2 is a block diagram illustrating a system to which a method for determining authenticity of banknotes using a contact image sensor according to an embodiment of the present invention is applied.

Referring to FIG. 2, a system to which the authenticity determination method of a bill using a contact image sensor is applied includes an RGB light source 12 and an infrared light source 14 therein, and includes a plurality of light rays including both visible light and infrared light. A contact image sensor 10 for irradiating to and recognizing a reaction of a special ink on a banknote, a database 30 storing a reference pattern value of a true banknote for a plurality of rays to be irradiated, and the contact image sensor 10 Comparing the pattern value calculated by combining a plurality of pieces of information recognized by < RTI ID = 0.0 >) < / RTI > and the reference pattern value of the true banknote read out from the database 30 to determine the authenticity of the central processing unit 20 and the central processing unit 20. It comprises a temporary storage unit 22 for temporarily storing the calculated pattern value, and the display unit 40 for outputting the authenticity determination result for the bill of the central processing unit 20 to the outside.

The contact image sensor (CIS) 10 is a compact image input device including a light source, a lens, and a sensor integrated therein.

A light source is required to obtain an image of an object using the contact image sensor 10. The currently used contact image sensor includes a light source having a single wavelength band therein, Therefore, it is divided into visible light source, infrared light source and color light source.

Unlike the contact image sensor currently used, the contact image sensor 10 according to an embodiment of the present invention includes two different light sources, that is, an RGB light source 12 and an infrared light source 14, respectively. Simultaneously irradiate the target bill.

In addition, the contact image sensor 10 divides one side of the banknote to which the plurality of visible and infrared rays are irradiated simultaneously into an image area having a predetermined same area, and reacts with the special ink used for the banknote in each image area. The luminance value, which is the contrast value, and the chromaticity value, which is the color value, are displayed.

The image area is set at one corner of the banknote as a reference point, and the longitudinal direction and the width direction of the banknote are divided at equal intervals so that each image area has a specific position value with respect to the reference point.

Therefore, the reaction of the special ink appearing in the specific area of the banknote can be accurately recognized as the brightness value and the color value, which are the contrast values for each image area.

The database 30 stores and stores a reference pattern value obtained by simultaneously irradiating and recognizing visible light and infrared light on the true paper currency in the contact image sensor 10.

Furthermore, the database 30 stores different pattern values according to the degree of use and damage of the paper money within a certain range of the reference pattern value for the same paper currency of the same paper money, so that the paper money for authenticity judgment is reclaimed. Even in the case of used paper money, the authenticity of the bill can be determined using the method according to the present invention.

The central processing unit 20 combines a plurality of pieces of information recognized in the image area through the contact image sensor 10 into continuous information and calculates a specific pattern value from the combined information.

In addition, the central processing unit 20 determines the authenticity of the banknote by comparing the calculated pattern value with the reference pattern value for the authentic paper money stored in the database 30.

The temporary storage unit 22 is a part for temporarily storing the pattern value of the central processing unit 20, the display unit 40 is a part for displaying the authenticity determination result for the bill to the outside, visually recognized from the outside It consists of a display or a buzzer device that generates an audible warning sound, and operates under the control of the central processing unit 20.

3 is a flowchart illustrating a method of determining authenticity of banknotes using the contact image sensor according to the present invention.

Hereinafter, a method of determining authenticity of bills using a contact image sensor according to an embodiment of the present invention will be described with reference to FIG. 3.

First, the visible light and infrared light are simultaneously irradiated on the bill for authenticity determination by the contact image sensor 10 having both an RGB light source 12 for irradiating monochromatic visible light and an infrared light source 14 for irradiating infrared light. (S310)

As a plurality of light rays irradiated from the two light sources as described above, the special ink used in the banknote reacts to display information such as brightness and color values unique to the banknote. The response information of the banknote is transmitted through the contact image sensor 10. Recognize (S320).

In this case, the contact image sensor 10 recognizes the response information appearing in each image area by dividing the bill into image areas having the same size and area.

Thereafter, the central processing unit 20 calculates a predetermined pattern value by combining a plurality of reaction information recognized by the contact image sensor 10 (S330).

The central processing unit 20 temporarily stores the calculated pattern value in the temporary storage unit 22, and finds the reference pattern value in the database 30 in which the reaction information irradiated simultaneously with visible light and infrared rays on the true banknote is stored. The authenticity of the banknote is determined by comparing with the pattern value stored in the temporary storage unit 22 (S340).

The central processing unit 20 controls the display unit 40 including a display or a buzzer to operate to recognize the authenticity determination result of the bill from the outside (S350).

The present invention described above is not limited to the above-described embodiment and the accompanying drawings, and various substitutions, changes, and conversions can be made without departing from the technical spirit of the present invention. It will be clear to those of ordinary knowledge.

As described above, the bill authenticity determination method using the contact image sensor, unlike the conventional method of determining the authenticity of the bill using a single light source, both the RGB light source and the infrared light source for irradiating the visible light of a single color is provided therein. By irradiating visible and infrared rays to the bill at the same time by using a contact image sensor to recognize the bill, there is an effect of obtaining improved discrimination power and high reliability in the determination of the authenticity of the bill.

In addition, by further simplifying the recognition process, there is another effect that can be utilized as a method for determining the authenticity of the financial automation device by reducing the time required to determine the authenticity of the bill.

Claims (4)

In the method of determining the authenticity of bills using a contact image sensor provided with an RGB light source and an infrared light source therein, Irradiating visible and infrared rays to the bill at the contact image sensor at the same time, and then recognizing, by the contact image sensor, a plurality of simultaneously irradiated rays (ie, visible and infrared rays) in response to the special ink used in the bill. Wow; Calculating, by a central processing unit, a predetermined pattern value from information recognized by the contact image sensor; Judging the authenticity of the bill by comparing the predetermined pattern value with the reference pattern value of the original bill for the plurality of light beams irradiated by the central processing unit; The authenticity determination method of banknotes using a contact image sensor, characterized in that consisting of. The method of claim 1, In the contact image sensor recognizes bills, The contact image sensor divides one side of a banknote to which two light beams are simultaneously irradiated into an image area having a predetermined same area, and a luminance value, which is a contrast value that appears in response to a special ink used in the banknote in each image area, and And authenticity determination method of bills using a contact image sensor, the method comprising: recognizing a chromaticity value that is a color value. The method of claim 1, And authenticating the authenticity determination result of the banknote by using a display and a buzzer. The method of claim 1, Banknotes using the contact image sensor, characterized in that the combination of the visible light of the red light, green light and blue light from the RGB light source and the infrared light from the infrared light source, sequentially irradiating the bill to the contact image sensor Authenticity method.

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