KR20120117049A - Method and apparatus for indentifying fake banknote in a poratable terminal - Google Patents

Abstract

The present invention relates to a method and apparatus for discriminating counterfeit bills in a portable terminal. The method for discriminating counterfeit bills in a portable terminal includes a process of previously storing an image of pneumoconiosis photographed in an infrared mode, and a process of photographing a target bill in an infrared mode; And measuring the similarity between the photographed image of the target banknote and an image of pre-stored pneumoconiosis, and comparing the measured similarity with a reference similarity to discriminate whether the target banknote is counterfeit or not. It allows the general user who does not have the expertise to easily know whether the target bill is a counterfeit bill.

Description

METHOD AND APPARATUS FOR INDENTIFYING FAKE BANKNOTE IN A PORATABLE TERMINAL}

The present invention relates to a portable terminal, and more particularly, to a method and apparatus for discriminating counterfeit bills in a portable terminal.

With the widespread use of devices such as high-performance copiers and printers, crimes to forge banknotes, documents, gift certificates, checks, etc. are increasing. In particular, with the recent development of counterfeit technology, it is difficult for a general user to distinguish between normal bills (pulmonary) and counterfeit bills (falsifying) only with the naked eye.

Accordingly, in order to distinguish between the pneumoconiosis and the atrophy, a technique has been introduced such that a specific letter or pattern appears on the bill only under ultraviolet or infrared rays.

However, a method of discriminating forgery by seeing a specific character or a pattern appear with the naked eye under the ultraviolet or infrared rays has a disadvantage in that the user must be aware of the discrimination method of the forgery accurately. If forged precisely until the user has a disadvantage that it is difficult to discriminate with the naked eye.

Of course, a discriminator for discriminating counterfeit bills has been provided in consideration of the characteristics of bills according to ultraviolet rays and infrared rays, but the price of the conventionally provided discriminators is very expensive and has a large size. It is not easy, and there is a disadvantage in that it is also inconvenient to carry.

The present invention is derived to solve the above problems, an object of the present invention to provide a method and apparatus for discriminating counterfeit bills in a portable terminal.

Another object of the present invention is to provide a method and apparatus for discriminating counterfeit bills using an infrared camera in a portable terminal.

It is still another object of the present invention to provide a method and apparatus for preliminarily storing feature information on a bill under infrared light for each kind of bill in a portable terminal, and discriminating whether or not it is a counterfeit bill compared to the feature of a bill taken through an infrared camera. Is in.

According to a first aspect of the present invention for achieving the above objects, a method for discriminating counterfeit bills in a portable terminal includes the steps of pre-storing an image of pneumoconiosis photographed in an infrared mode; And measuring the similarity between the photographed image of the target banknote and an image of pre-stored pneumoconiosis, and discriminating whether the target banknote is counterfeit by comparing the measured similarity with a reference similarity.

According to a second aspect of the present invention for achieving the above object, a counterfeit bill discrimination apparatus in a portable terminal, the storage unit for storing in advance the image of the pneumothorax taken in the infrared mode, and the camera for photographing the target bill in the infrared mode And a control unit for measuring similarity between the photographed image of the target banknote and an image of pre-stored pneumoconiosis, and comparing the measured similarity with a reference similarity.

The present invention stores in advance the feature information on the bill under the infrared for each paper type of bill in a portable terminal, automatically identifies the paper type of the bill included in the image input through the visible light camera, the image input through the infrared camera By comparing the characteristics of the bill included in the bill with the pre-stored feature information on the paper, whether or not it is a counterfeit bill, so that an ordinary user without expert knowledge of pneumococcal and counterfeit can easily know whether the bill is counterfeit. There is.

1 is a block diagram of a portable terminal according to the present invention;
2A and 2B are diagrams illustrating a procedure for discriminating whether a counterfeit bill is present in a portable terminal according to an embodiment of the present invention;
3 shows, for example, bills under visible light and bills under infrared light; and
4 is a diagram showing, for example, the front side and the back side of a banknote under infrared light.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings. In the following description of the present invention, detailed descriptions of related well-known functions or configurations will be omitted if it is determined that the detailed description of the present invention may unnecessarily obscure the subject matter of the present invention. In addition, terms to be described below are terms defined in consideration of functions in the present invention, which may vary according to intention or custom of a user or an operator. Therefore, the definition should be based on the contents throughout this specification.

The present invention will be described with respect to a method and apparatus for discriminating counterfeit bills using an infrared camera in a portable terminal. In the following description, genuine banknotes issued normally are called pulmonary, and fake banknotes issued abnormally are called counterfeit.

1 shows a block configuration of a portable terminal according to the present invention.

Referring to FIG. 1, the portable terminal includes a control unit 100, a camera unit 120, an illumination sensor 130, a storage unit 140, a display unit 150, and an input unit 160. The controller 100 includes a banknote discrimination controller 110, and the banknote discrimination controller 100 includes a book type identification unit 112, an illuminance detection unit 114, and a banknote discrimination unit 116. In addition, the camera unit 120 includes an infrared filter 122, the storage unit 140 is configured to include a feature DB (DataBase) 142 for each bill type.

The control unit 100 controls and processes the overall operation of the portable terminal, and performs a function for discriminating whether the bill included in the input image is pulmonary or counterfeit through the bill discrimination control unit 110 according to the present invention. Control and handling.

That is, when the banknote discrimination event is generated according to a user control, the banknote discrimination control unit 110 identifies the banknote type of the banknote to be discriminated through the booktype identification unit 112. After the paper type identification is completed, the banknote discrimination control unit 110 outputs an infrared mode switching signal to the camera unit 120 to switch to the infrared mode. Here, the banknote discrimination control unit 110 may determine to automatically switch to the infrared mode when the paper type identification is completed, and switch to the infrared mode when a menu or a key indicating the start of counterfeit discrimination is selected by the user. You might decide. The banknote discrimination control unit 110 switches to the infrared mode, and then checks whether the current brightness degree is suitable for discriminating banknotes through the illuminance detecting unit 114, and the current brightness degree is a brightness suitable for discriminating banknotes. If, the user guides the bill photographing method. For example, the banknote discrimination control unit 110 may request the user to photograph the front or the back of the banknote, information necessary to photograph the size of the banknote according to a preset size or a reference position, or recognize the size of the banknote. You can request to enter. Subsequently, the banknote discrimination control unit 110 receives an image photographing a banknote to be discriminated in the infrared mode from the camera unit 120 and based on the pre-stored feature information for each kind of paper through the banknote discriminating unit 116. It controls and processes the function for discriminating the authenticity of the bill included in the image photographed in the infrared mode. Thereafter, the bill discrimination control unit 110 controls and processes a function for notifying the user of the discrimination result for the bill.

Looking at the configuration of the banknote discrimination control unit 110 in more detail, when the banknote discrimination unit 112 generates a banknote discrimination event according to the user control, after receiving the image photographed in the visible light mode, the The bill type of the bill included in the input image is identified based on the feature DB 142 according to the bill type of the storage 140. That is, the paper type identification unit 112 obtains information (hereinafter, referred to as 'paper type related information') necessary for acquiring a paper type, such as a country, a par value, whether the front or back of the paper money, issuance year, etc., from the input image. In the feature DB 142 according to the bill type, it is checked whether there is a piece corresponding to the obtained piece type related information. When the paper type corresponding to the acquired related information is successfully inspected, the paper type identification unit 112 determines the checked paper type as the paper type of the bill included in the photographed image and corresponds to the obtained related information. When the scoop is not inspected, the user is requested to input the scoop or the related information of the bill to be discriminated and identifies the scoop based on the information input by the user. Here, the paper type identification unit 112 may detect a bill area from the input image, and then recognize the preset area in the detected bill area to obtain information about the paper type. For example, after detecting the banknote region in the input image, the value of the face value is acquired by recognizing the upper right region or the lower left region of the detected banknote region, and when the number is detected in the upper right region, the front side of the banknote is recognized. If the number is not detected, it may be recognized as the reverse side of the banknote. Of course, in order to obtain the paper-related information of the paper money from the input image in the paper type identification unit 112, conventionally known image recognition algorithms may be used, and to identify the paper type of the paper money included in the input image, Algorithms known in the art may be used. In addition, the paper type identification unit 112 detects the image of the banknote from the input image, and compares the detected banknote image with the reference banknote image for each kind of notes stored in advance to measure the similarity included in the input image You might be able to identify it. Here, the image photographed in the visible light mode may be an image input through a camera preview or an image obtained through capture, or may be an image stored in the storage 140.

The illuminance detecting unit 114, after identifying the winding type of the input image, is switched to the infrared mode, measures the brightness value of the entire image input through the camera unit 120 or the brightness from the illuminance sensor 130 After receiving the value, it is set as the current brightness value, and the current brightness value is checked whether it satisfies a preset brightness condition to check whether the current brightness is suitable for discriminating banknotes. That is, when the current brightness corresponds to a preset brightness range, the illuminance sensor 114 determines that the current brightness is suitable for discriminating banknotes. On the other hand, if the current brightness is out of the predetermined brightness range, the illumination sensor 114 determines that the current brightness is not suitable for discriminating bills, and requests the user to install an infrared filter. Here, the infrared filter serves to block information other than the infrared signal among the optical signals input to the camera sensor in places such as outdoors and fluorescent lights.

The banknote discrimination unit 116 discriminates the authenticity of banknotes included in the image photographed in the infrared mode, based on previously stored feature information for each kind. The bill discrimination unit 116 receives the bill type information of the bill to be discriminated from the bill discrimination control unit 110, and the image under infrared light corresponding to the bill class of the bill to be discriminated in the specific DB 142 for the bill class. Or search for feature information about the image under infrared light. Thereafter, the bill discrimination unit 116 measures similarity between the bill image included in the image photographed in the infrared mode and the image under the searched infrared ray, or the feature information from the bill image included in the image photographed in the infrared mode. Extraction and correction are performed to measure the similarity between the extracted and corrected feature information and the feature information for the retrieved infrared image. Thereafter, the banknote discrimination unit 116 compares the measured similarity with the reference similarity to determine whether the banknote is authentic. That is, when the measured similarity is less than the reference similarity, the banknote discrimination unit 116 determines that the banknote is counterfeit, and when the measured similarity is greater than or equal to the reference similarity, the banknote discrimination may be determined as puffing. have.

The camera unit 120 may include a camera sensor (not shown) for converting an optical signal detected during image capturing into an electrical signal, and a signal processor (not shown) for converting an analog image signal photographed from the camera sensor into digital data. It is provided with, to provide the image to be taken to the controller 100. In particular, the camera unit 120 includes an infrared filter 122 to switch between the visible light mode and the infrared mode under the control of the controller 100. That is, when a signal indicating switching to the infrared mode is input from the controller 100, the camera unit 120 drives the infrared filter 122 to output a signal other than the infrared signal among the optical signals input to the camera sensor. By blocking, an image including only information on the infrared signal is provided to the controller 100. Here, the infrared filter 122 is driven only while the portable terminal operates in the infrared mode. In addition, in the present invention, the case where the infrared filter 122 is pre-mounted to the camera unit 120 has been described as an example. However, the camera unit 120 may not include the infrared filter 122. In this case, The control unit 100 may detect this through the illuminance detecting unit 114 and request the user to mount the infrared filter 122.

The illuminance sensor 130 is a sensor for detecting the brightness of the surroundings, and detects the ambient brightness of the portable terminal under the control of the controller 100 and provides it to the controller 100.

The storage unit 140 stores various programs and data necessary for the operation of the portable terminal, and includes a feature DB 142 for each bill type according to the present invention. The bill DB features 142 by bill type, for each bill of the bill type, the reference image photographed in visible light mode, the characteristic information on the reference image photographed in visible light mode, the reference image photographed in infrared mode, infrared mode Characteristic information about a reference image, the country of the bill, par value, whether the front or back of the bill, and the year of issue are included. For example, as shown in FIG. 3, the feature DB 142 according to the bill type is a reference image photographing 50 euros in a visible light mode and a reference image photographing 50 euros in an infrared mode with respect to 50 euros. It may store the information, and the information indicating the European Union, 50, the front side as the paper-related information of the bill image.

The display unit 150 displays various state information, numbers, letters, and images generated during the operation of the portable terminal. In particular, the display unit 150 displays an image photographed by the camera unit 120 under the control of the controller 100. In particular, the display unit 150, under the control of the control unit 100, a message for requesting the user to input the paper sheet information or the paper-related information of the bill to be discriminated, a message requesting the installation of the infrared filter, to discriminate Messages necessary for differentiating banknotes are displayed, such as a message guiding a photographing method of banknotes and a message indicating the authenticity of the target banknote.

The input unit 160 includes at least one function key or a touch sensor, thereby providing the control unit 100 with data corresponding to a key pressed by the user or a position touched by the user. The input unit 160 may receive the kind information or the kind related information of the bill to be discriminated from the user, and may receive information on the size of the bill.

2A and 2B illustrate a procedure for discriminating whether a forged bill is present in a portable terminal according to an exemplary embodiment of the present invention.

2A and 2B, the portable terminal determines whether a banknote discrimination event occurs according to user control in step 201. For example, the portable terminal checks whether a menu or a key for discriminating bills is selected. When the banknote discrimination event occurs, the portable terminal acquires an image including the target banknote to be discriminated by operating the camera in the visible light mode in step 203, and then identifies the paper species of the banknote included in the acquired image. do. Here, the visible light mode refers to a general camera operation mode for generating an image including information on the visible light signal. At this time, the portable terminal obtains the paper-related information such as the country, face value, whether the front or back of the bill, the issue year, etc. of the target bill from the image photographed in the visible light mode, the pre-stored bill DB by feature DB (142) It is possible to identify the roll type of the target bill by checking whether there is a roll type corresponding to the obtained roll type related information. In addition, the portable terminal detects an image including only a banknote region from the image taken in the visible light mode, and compares the entire detected banknote image with a pre-stored reference image for each kind or extracts the feature information of the bill image The winding type of the target banknote may be identified by comparing the feature information of the reference image for each winding type stored in advance.

Thereafter, the portable terminal checks whether the paper roll identification of the target bill is successfully performed. If the paper currency of the target banknote is successfully identified, the portable terminal proceeds directly to step 211. On the other hand, if the paper type identification of the target banknote fails, the portable terminal requests the user to input the paper sheet information or the paper sheet related information on the target banknote in step 209 to receive the paper sheet information or paper species related information from the user; , Identify the kind of winding of the target bill.

After the paper type identification of the target banknote is completed, the portable terminal switches the camera to an infrared mode in step 211. Here, the portable terminal may automatically switch the camera to an infrared mode after completion of the paper ball identification of the target bill, and may switch to the infrared mode when a user input for switching the infrared mode is generated. will be. In this case, the portable terminal may display a message indicating switching of the infrared mode on the screen.

In step 213, the portable terminal measures the current brightness value. In step 215, the portable terminal determines whether the measured brightness value satisfies a preset reference brightness condition. That is, the portable terminal measures the brightness value of the entire image input through the camera in the infrared mode or the brightness value through the illumination sensor 130, and then checks whether the measured brightness value satisfies the reference brightness condition Check whether the current brightness is suitable for banknote discrimination.

If the measured brightness value does not satisfy the reference brightness condition, the portable terminal proceeds to step 219 and requests the user to install an infrared filter, and returns to step 215 to perform the following steps again.

On the other hand, if the measured brightness value satisfies the reference brightness condition, the portable terminal proceeds to step 217 to guide the user to photographing the bill, and detects the user's input therein to obtain photographing information on the target bill. For example, the portable terminal may request the user to photograph the front side of the banknote when the pre-stored banknote-related information of the paper species corresponding to the target banknote indicates the front side of the banknote in the feature DB 142 for each banknote roll type. In addition, when the paper-related information of the paper type corresponding to the target paper money indicates the back side of the paper money, the user may request to photograph the back side of the paper money. In this case, the request for photographing the front side or the back side of the banknote may be performed even when the image is acquired in step 203. In addition, the portable terminal may request to photograph the size of the bill according to a preset size or a reference position in step 217, and request the user to input information necessary to recognize the size of the bill to be photographed. For example, the portable terminal may display a mark such as "" "on the upper left of the screen and request that the user take a picture of the bill in accordance with the mark. In this case, the display may simultaneously display a target banknote with a predetermined size by simultaneously displaying a “” mark on the lower right side, and shoot by matching the “” mark on the upper left side, and the user touches the screen or uses a direction key to The lower right portion may be set to allow the user to shoot the target bill in a desired size. Accordingly, the portable terminal can obtain whether the front or back of the target bill and size information.

In step 221, the portable terminal photographs the target banknote in the infrared mode. In step 223, the portable terminal compares the image of the photographed target banknote with the pre-stored image of the winding type of the target banknote and measures similarity. Of course, at this time, the portable terminal may extract and correct the feature from the image of the photographed target bill, and measure the similarity between the two features by comparing the extracted and corrected feature with previously stored features of the paper currency of the target bill. have.

In step 225, the portable terminal compares the measured similarity with a preset reference similarity. If the measured similarity is greater than the preset reference similarity, the portable terminal proceeds to step 227 to notify that the target banknote is a normal banknote. Terminate the algorithm according to the invention.

On the other hand, when the measured similarity is smaller than the preset reference similarity, the target bill is not a normal bill but a fake bill, and the algorithm according to the present invention is terminated. That is, as shown in FIG. 4, since the image of the lung cancer in the infrared mode and the image of the gastric lung in the infrared mode have different characteristics, the similarity between the two images will be measured to be smaller than the reference similarity. Accordingly, the portable terminal may determine that the target banknote is counterfeit.

In the above description, it has been described on the assumption that the feature DB 142 for each bill type is previously stored in the portable terminal. However, the feature DB 142 for each bill type may be updated by a user according to a design scheme. For example, when the user wants to add or update information about US $ 100 in the feature DB 142 for each bill type, the US $ 100 is photographed in the visible light mode and the infrared mode, respectively, Both images can be stored as a reference image in visible mode and an infrared mode for US $ 100. Of course, at this time, the characteristics of the two captured images may be analyzed and stored, and additional information (for example, front side / back side of banknote, issue year, etc.) of the US $ 100 may be received and stored from the user.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications may be made 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 determined not only by the scope of the following claims, but also by the equivalents of the claims.

100: control unit 110: banknote discrimination control unit
112: winding species identification unit 114: illuminance detection unit
116: banknote discrimination unit 120: camera unit
122: infrared filter 130: illuminance sensor
140: storage unit 142: feature DB by bill type
150: display unit 160: input unit

Claims (20)

In the method of discriminating counterfeit bills in a portable terminal,
Pre-storing images of pneumoconiosis taken in infrared mode;
Photographing the target bill in infrared mode,
Measuring a similarity between the image of the target banknote and an image of pre-stored pneumoconiosis;
And comparing the measured similarity with a reference similarity to discriminate whether the target banknote is forged or not.
The method of claim 1,
Measuring the similarity between the image of the target banknote and the image of the pre-stored pneumoconiosis,
Extracting features from the image of the target bill;
And comparing the extracted features with the features of the pre-stored image of pneumoconiosis.
The method of claim 1,
Photographing the target banknote in visible light mode;
Identifying the paper type of the target banknote by using the image photographed in the visible light mode;
And selecting an image of the pneumoconiosis corresponding to the identified swelling from the images of the pneumoconiosis taken in the infrared mode.
The method of claim 3, wherein
The process of identifying the paper type of the target banknote by using the image photographed in the visible light mode,
And comparing the images of the visible light mode pre-stored for each winding type with an image of the target bill in the visible light mode.
The method of claim 3, wherein
If the identification of the paper species of the target banknote fails, requesting the input of the paper species information;
The method further comprises the step of receiving the kind information from the user.
The method of claim 1,
Measuring a brightness value in the infrared mode;
Checking whether the measured brightness value satisfies the reference brightness condition;
And if the measured brightness value does not satisfy a reference brightness condition, requesting mounting of an infrared filter.
The method according to claim 6,
The brightness value in the infrared mode, characterized in that any one of the brightness of the screen and the brightness measured by the illuminance sensor.
The method of claim 1,
The process of pre-store the image of the pneumoconiosis taken in the infrared mode,
And storing information on the taken cough of the pneumoconiosis,
The information on the denomination, characterized in that at least one of the country, par value, year of issue, front / back side information.
The method of claim 1,
When taking the target banknote in the infrared mode, further comprising the step of guiding a shooting method,
The photographing method may include a photographing method for at least one of a photographing surface and a photographing size of the target banknote.
The method of claim 1,
The process of discriminating whether the target banknote is forged,
If the measured similarity is greater than or equal to the reference similarity, discriminating the target banknote with pneumoconiosis;
And if the measured similarity is less than a reference similarity, discriminating the target banknote as counterfeit.
In the device for discriminating counterfeit bills in a portable terminal,
A storage unit for storing images of pneumoconiosis taken in infrared mode in advance;
Camera unit photographing target bill in infrared mode,
And a control unit for measuring similarity between the image of the target bill and an image of pre-stored pneumoconiosis, and discriminating whether the target banknote is counterfeit by comparing the measured similarity with a reference similarity.
12. The method of claim 11,
The controller may be configured to extract a feature from an image of the target bill and measure similarity by comparing the extracted feature with a feature of the pre-stored image of pneumoconiosis.
12. The method of claim 11,
The camera unit photographs the target banknote in visible light mode,
The controller may identify the paper type of the target banknote by using the image photographed in the visible light mode, and select an image of the pneumonia corresponding to the identified paper type from the images of the pneumoconiosis taken in the infrared mode. Device.
The method of claim 13,
The controller may be configured to identify the winding type of the target banknote by comparing images of the visible light mode stored in advance for each winding type and the image photographed in the visible light mode of the target banknote.
The method of claim 13,
The controller, if the identification of the paper currency of the target banknote fails, request the input of the paper material information, characterized in that the user receives the paper material information.
12. The method of claim 11,
The controller measures the brightness value in the infrared mode, checks whether the measured brightness value satisfies the reference brightness condition, and requests the mounting of the infrared filter when the measured brightness value does not satisfy the reference brightness condition. Device characterized in that.
17. The method of claim 16,
In the infrared mode, the brightness value, characterized in that any one of the brightness of the screen and the brightness measured by the illuminance sensor.
12. The method of claim 11,
The storage unit stores the information on the rolled paper of the pneumoconiosis,
The information on the paper type, the device, characterized in that at least one of the information, including the face value, year of issue, front / back.
12. The method of claim 11,
The control unit, when photographing the target bill in the infrared mode, guides the shooting method,
The photographing method may include a photographing method for at least one of a photographing surface and a photographing size of the target banknote.
12. The method of claim 11,
The controller, when the measured similarity is greater than or equal to the reference similarity, discriminates the target banknotes by pneumoconiosis, and when the measured similarity is less than the standard similarity, the apparatus may distinguish the target banknotes by counterfeiting. .

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