KR20090008708A

KR20090008708A - Discerning method for counterfeit note using contact image sensor

Info

Publication number: KR20090008708A
Application number: KR1020070071879A
Authority: KR
Inventors: 이창환
Original assignee: 노틸러스효성 주식회사
Priority date: 2007-07-18
Filing date: 2007-07-18
Publication date: 2009-01-22

Abstract

The present invention relates to a counterfeit identification method using a contact image sensor. More specifically, the sensor of the light receiving unit can acquire a minimum of data for authenticity identification of a bill and at the same time obtain a color pattern at a predetermined position of the bill. The present invention relates to a counterfeit identification method using a contact image sensor that can improve the discriminating power of authenticity of banknotes and the reliability of judgment results.

In the forgery identification method using a contact image sensor according to the present invention, in the forgery identification method using a contact image sensor comprising a light source unit and a light receiving unit for receiving the light transmitted or reflected through the banknote light emitted from the light source unit The light-receiving unit alternately repeatedly acquires line segment data for monochromatic visible light and infrared rays transmitted or reflected from a bill and identifies an image of the bill, and acquires line segment data for RGB light rays corresponding to a predetermined position of the bill. It is characterized in that it is operated to identify the color pattern.

Description

Discrimination method for using forgery image sensorDiscrening method for counterfeit note using contact image sensor

The banknote recognition device of the conventional automatic teller machine is provided with a transfer unit for transferring banknotes (banknotes and securities), and fixedly installed a plurality of infrared wavelength light source and a light receiving sensor formed in pairs at predetermined intervals above and below the transfer unit. When the banknotes are transferred, it is configured to detect the infrared ink pattern displayed on the banknotes to determine the authenticity and the paper type of the banknotes.

However, in this type of banknote recognition device, when the banknote passes, the infrared wavelength light source and the light receiving sensor detect only one point of the infrared ink pattern. There is a problem of being misrecognized or unrecognized.

On the other hand, another conventional banknote recognition device is a method using a contact image sensor having an infrared wavelength light source of the same wavelength to detect the infrared ink pattern displayed on the bill. The contact image sensor is a compact image input device in which the light source, the lens, and the sensor part are integrated. A light source is required to obtain an image of the contacted object. All the light sources of all currently used contact image sensors are manufactured as a single wavelength light source. It is used. The image sensor is classified into a sensor using a visible light source, a sensor using an infrared light source, and a sensor using a color light source according to the purpose of use.

However, the infrared ink pattern, which is an anti-counterfeiting element applied to banknotes and securities, is typically applied only to letters or partial patterns, and the remaining area uses a visible light ink pattern. Therefore, due to the characteristics of the infrared wavelength light source, the region to which the infrared ink pattern is applied is shown as a black pattern, and the other region, that is, the region to which the visible light ink pattern is applied, does not appear any image. Therefore, there is a problem that is difficult to distinguish because the border of the banknote is not clearly displayed. In other words, the exact position and size of the pattern is essential for recognizing and discriminating the pattern. However, if the pattern is analyzed based on a borderline that is blurred and cannot be accurately distinguished, an error occurs and thus there is a limit in authenticity identification and classification of the class.

On the other hand, the method for identifying the color pattern from the bill using the contact image sensor, by sequentially lighting the RGB tricolor light source and infrared light source to detect the light reflected or transmitted through the bill through the sensor of the light receiving unit, and sampling the color pattern And images are acquired. For example, when the bill moves at a speed of 400 ms, the R light source, the G light source, the B light source, and the IR light source are sequentially turned on, and as shown in FIG. 1, the data of the line segment of the bill, that is, R, G, The wavelength for B, IR was obtained. A color pattern was detected by combining three pieces of R, G, and B data acquired for each line section, and an image pattern was detected from the IR data.

However, in the automated teller machine operating in the actual ATM operation field, since the bill passes quickly with 1600 ms, it is difficult to acquire data for each section as described above with the current contact image sensor. Since one piece of data is presented, it is too short to identify the authenticity of the bill.

In order to solve this problem, the current contact image sensor identifies the authenticity of banknotes by acquiring G and IR data, but it is difficult to accurately identify the authenticity of banknotes because it is impossible to obtain a color pattern from the banknotes in this way.

Accordingly, the present invention is to solve the above problems, by operating the sensor of the light receiving unit to obtain the G and IR data alternately and to obtain the R, G, B data at a predetermined position to identify the authenticity of the bills. It is an object of the present invention to provide a counterfeit identification method using a contact image sensor that can increase the amount of data that can be used to obtain authenticity and accurate identification results.

In order to achieve the above object, the forgery identification method using the contact image sensor according to the present invention comprises a light source unit and a light receiving unit for receiving light transmitted or reflected through the banknote light emitted from the light source unit In the counterfeit identification method using the above, the light-receiving unit alternately repeatedly acquires the line segment data for the monochromatic visible light and infrared rays transmitted or reflected from the banknote to identify the image of the banknote, RGB rays corresponding to the predetermined position of the banknote It is characterized in that it is operated to identify the color pattern by acquiring the line segment data for.

In the counterfeit identification method using the contact image sensor according to the present invention, by operating the sensor of the light-receiving unit to obtain the IR data, G data and RGB color data to obtain the minimum data that can identify the authenticity of the bill from the bill By improving the resolution of the image and operating to identify the color pattern, it is effective to identify the counterfeit more accurately.

EMBODIMENT OF THE INVENTION Hereinafter, although the Example of this invention is described in detail, this invention is not limited to a following example, unless the summary is exceeded.

2 is a block diagram showing the configuration of the forgery identification apparatus using a contact image sensor according to the present invention.

Referring to FIG. 2, the counterfeit identification device using the contact image sensor includes a light source unit 10 having an RGB light source and an infrared (IR) light source therein, and irradiating a light beam to a bill to identify a special ink on the bill for the light. A pattern value and a database calculated by combining the light receiving unit 19 for recognizing the reaction, a database 30 storing the reference pattern value of the true banknote for the corresponding light beam irradiated, and the data recognized by the light receiving unit 19 ( The central processing unit 20 for comparing the reference pattern values of the genuine banknotes read in 30 and determining the authenticity, the temporary storage unit 22 temporarily storing the calculated pattern values of the central processing unit 20, and the central processing unit ( It is configured to include a display unit 40 for outputting the authenticity determination result for the bill of 20 to the outside.

The light source unit 10 is repeatedly arranged adjacent to each other so that the RGB light source and the IR light source can be transmitted or reflected on the banknote and detected by the light receiving unit 19. The light emitted from the RGB light source and the IR light source does not need to be closely arranged because it is emitted.

In the light receiving unit 19, a plurality of sensors for detecting light are arranged in a matrix form. The sensor divides one side of a banknote to which monochromatic light and infrared rays or color light and infrared light are irradiated into an image area having a predetermined same area, and a luminance value that is a brightness value that appears in response to the special ink used in the banknote in each area. Recognize the chromaticity value, which is the color value.

The image area is set at one corner of the banknote as a reference point, and the length 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, respectively. Therefore, the reaction of the special ink appearing in the specific area of the banknote can be accurately recognized by the brightness value and the color value, which are the contrast values, for each image area. Detect.

The database 30 serves to store and store the reference pattern values obtained by irradiating and recognizing the RGB light and the infrared rays on the true bill in the light source unit 10. In addition, 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 kind of paper money of the same paper money, so that the bill of authenticity is not a new paper money. In the case of old paper money, the authenticity of the paper money can be determined using the method according to the present invention.

The central processing unit 20 controls the respective devices, combines the plurality of data recognized in the image area through the light receiving unit 19 into continuous data, and calculates a specific pattern value from the combined data. In the present invention, the central processing unit 20 alternately repeatedly detects the light emitted from the G light source and the IR light source by the sensor of the light receiving unit 19, and operates to continuously detect the light emitted from the RGB light source at a predetermined position. do.

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 result of the authenticity determination of the bill to the outside, the display or visual recognition from the outside It consists of a buzzer device that generates an audible warning sound, and operates under the control of the central processing unit 20.

3 is a view illustrating an example in which data is acquired from a sensor of a light receiving unit in the forgery identification apparatus using a contact image sensor according to the present invention, and will be described with reference to FIG. 2.

In the counterfeit identification method using the contact image sensor according to the present invention, when a bill is inserted into a bill insertion slot of an identification device using a contact image sensor, the bill is moved along a bill transfer path, and the light source unit 10 sequentially turns the light source by type. The light receiving unit 19 receives light transmitted or reflected through banknotes for each type of light source to be lighted through the sensor of the light receiving unit. At this time, the light source unit 10 turns on the G light source and the IR light source alternately, and continuously illuminates the RGB light source irrespective of the order in the predetermined position of the banknote, that is, the area where the color pattern should be detected.

In this way, the light transmitted through the banknote or reflected on the banknote appears as shown in FIG. 3 in the sensor of the light receiving unit 19. Data through the G light source and the IR light source are alternately obtained, and a color pattern is obtained from a predetermined position and the banknote. In the area to be detected, data through an RGB light source is continuously obtained, so that an image and a color pattern can be simultaneously obtained from a bill. Here, it is said that an image is obtained through an IR light source and a color pattern is obtained through an RGB light source. However, when all the data are combined, an image of a banknote is obtained as a result.

The data obtained by the light receiving unit 19 is combined into continuous data in the central processing unit 20, and when a specific pattern value is calculated from the combined data, the authenticity of the bill is compared by comparing with the reference pattern value stored in the database 30. To identify.

Acquiring the data in this way increases the amount of data that can identify the authenticity of the banknote compared to the method shown in FIG. 1, so that the authenticity of the banknote can be accurately identified and color patterns can be detected in addition to the image. The authenticity of can be identified more quickly and accurately.

As described above, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined by the claims below and equivalents thereof.

1 is a view illustrating an example in which data is acquired from a sensor of a light receiving unit in a forgery discrimination apparatus using a contact image sensor according to the related art.

Figure 2 is a block diagram showing the configuration of the forgery identification device using a contact image sensor according to the present invention.

3 is a view illustrating an example in which data is acquired from a sensor of a light receiver in the forgery identification apparatus using a contact image sensor according to the present invention;

10 light source unit 19 light receiving unit

20: central processing unit 22: temporary storage unit

30: database 40: display unit

Claims

In the forgery identification method using a contact image sensor comprising a light source unit and a light receiving unit for receiving the light transmitted or reflected through the banknote light emitted from the light source unit,

The light-receiving unit alternately repeatedly acquires line segment data of monochromatic visible light and infrared rays transmitted or reflected from a bill and identifies an image of the bill, and obtains line segment data of RGB light rays corresponding to a predetermined position of the bill. Counterfeit identification method using a contact image sensor, characterized in that it is operated to identify the color pattern.

The method of claim 1,

The monochromatic visible light is a forgery identification method using a contact image sensor, characterized in that one selected from the group consisting of red (R), green (G) and blue (B).

The method of claim 1,

The counterfeiting identification method using the contact image sensor is a counterfeit identification method using a contact image sensor, characterized in that it is operated so that the pre-segment data for RGB light at a predetermined position can be continuously obtained.