KR100491649B1 - Insertion and detecting system of multi-dimension barcode and the control method - Google Patents

Abstract

The present invention relates to a system for inserting and detecting a watermark and a method of controlling the same, and an object thereof is to provide a system and a control (insertion and detection) for watermark insertion and detection of a multidimensional barcode for preventing illegal copying on / offline. A method, comprising: encoding means for encoding a watermark on a multidimensional barcode to eradicate commercial theft such as illegal copying and forgery of various contents distributed through the Internet, and decoding for decoding the watermarked multidimensional barcode And a means for embedding and detecting a watermark in a multidimensional bar code, the encoding means comprising a user interface module, a serialization module configured for serialization of a signal input via the interface module, and a serialization module. A barcode generator for generating a barcode using a signal, and the barcode A watermark generator for generating a watermark to be inserted into the barcode generated by the code generator, and a barcode encoder for encoding the barcode generated by the watermark generator, wherein the decoding means includes a watermark embedded in the multidimensional barcode. A barcode reader that serves as a decoder for detecting, a watermark detection module that receives and converts a signal decoded through the barcode reader, and a watermark analysis module that analyzes the signal detected by the watermark detection module; And a watermark generator for receiving the signal analyzed by the watermark analysis module and restoring the watermark set by the first user.

Description

Watermark insertion and detection system of multidimensional barcodes and its insertion and detection method {INSERTION AND DETECTING SYSTEM OF MULTI-DIMENSION BARCODE AND THE CONTROL METHOD}

The present invention relates to a watermark insertion / detection system of a multidimensional barcode and a method of inserting and detecting the same. More specifically, the present invention relates to a watermark detector that can easily read forgery and forgery even with an off-line barcode reader. The present invention relates to a method of inserting a watermark into a multi-dimensional barcode so as to be visible or invisible and easily detecting the watermark.

In recent years, barcodes are spreading all over the world in highly advanced living cultures. These barcodes are printed on labels of foodstuffs, miscellaneous goods, etc., and product information is obtained from the printed barcodes. It is mainly used to simplify registration.

By the way, in general, the barcode system that we encounter in daily life is a one-dimensional barcode system that stores only limited information, and the multi-dimensional barcode system not only has limited information but also has data encryption function as well as user-informed information. At the highest level, even if 50% of the symbols are damaged, data can be restored and it is a system that can represent a large amount of data in a limited space.

Such a multi-dimensional bar code is a new concept of information storage means that overcomes the capacity limitation of the existing one-dimensional bar code. Conventional one-dimensional bar code mainly displays 13 to 14 digits of data, but a multi-dimensional bar code can contain at least 1000 characters of data. It has the data storage capacity more than 100 times than the conventional one-dimensional bar code, so it is easy to preserve and transmit data, and it can be used as data again by storing text, voice, file, etc. It is expected.

Meanwhile, with the development of digital technology, many digital works of various forms have been produced. Such digital works can be reproduced indefinitely without damaging the original, and since the copy and the original are difficult to distinguish, illegal copying and illegal distribution are indiscriminate.

There is a digital watermarking method as a method for preventing illegal copying and forgery / falsification of such digital works (a kind of digital content). Digital watermarking is a technology that inserts specific data (watermarks) to be claimed, such as copyright information, into multimedia content such as audio, video, image, or text, indistinguishable to the naked eye or hearing.

If it is necessary to identify the owner of an element, such as a dispute of ownership, in the distribution process of digital content, the watermark is inserted to provide a basis for exercising the right of ownership, copyright, etc.

The conventional digital watermarking has the advantage of protecting the copyright information by concealing and inserting information about the content without the user's knowledge, but mainly by protecting the digital content on-line. It has been considered only in terms of the technical aspects, and it has not been considered in determining whether or not forgery / falsification of the printed document after the digital content has been output, and recently, gift certificates, tickets, civil documents, etc. All of them are produced in the form of digital files, but there is a problem in that illegal distribution of off-line illegally cannot be prevented on whether or not forgery / modulation after the documents produced in the form of digital files are output to the printer. .

Accordingly, an object of the present invention is to solve the above problems, and an object of the present invention is to implement a watermarking on a multi-dimensional barcode on-line, as well as to decode the barcode on a particularly off-line. The present invention provides a watermark insertion / detection system of a multidimensional barcode which can easily read forgery and forgery, and a method of insertion and detection thereof.

The present invention relates to a system for inserting and detecting a watermark of a multidimensional barcode and a method of controlling the same, and comprising encoding means for encoding a watermark on a multidimensional barcode to eliminate commercial theft such as illegal copying and counterfeiting of various contents distributed through the Internet. And a decoding means for decoding the watermarked multidimensional barcode, wherein the encoding means is inserted and detected in the multidimensional barcode, wherein the encoding means is configured for serializing a signal input through the user interface module and the interface module. A serialization module, a barcode generator for generating a barcode using the signal passed through the serialization module, a watermark generator for generating a watermark to be inserted into the barcode generated by the barcode generator, and a watermark generator. Including a barcode encoder that encodes a barcode High,

The decoding means may include a barcode reader serving as a decoder for detecting a watermark inserted into a multidimensional barcode, a watermark detection module for receiving a signal decoded through the barcode reader, and converting the signal into a watermark detection module. And a watermark generator for analyzing the detected signal and a watermark generator for receiving the signal analyzed by the watermark analysis module and restoring the watermark set by the first user.

In addition, the issuing means includes a watermark generator for generating an encrypted special key selected by a setter such as a corresponding company, and a watermark inserter for inserting the coded and encrypted watermarks generated by the watermark generator. And a digital file generation unit (watermark output unit) for outputting the signal generated / inserted by the watermark insertion unit into a digital file.

The watermark generating unit may generate a watermark by using any one of a key generation method, a logo method, and simultaneously adopting the key generation method and the logo method.

In addition, the issuing means is that if the user who wants to receive the barcode with the watermark is connected via the Internet to receive the ID and password to authenticate whether the accessor is a member, and to perform the following procedure only if the member is a member It features.

In addition, the multi-dimensional bar code is characterized in that the multi-dimensional bar code that can store a large amount of data, and can store and transmit the data at least two dimensions.

In addition, a method of embedding a watermark includes: (a) selecting data to be inserted as a watermark, and (b) a watermark to be used after selecting either one of visible or invisible watermarking after step (a). (C) converting the original barcode into a frequency domain based on the method selected from the step (b); and (d) converting the barcode data converted from the step (c) into a bit string. (E) generating a bit string by means of a secret key after step (d), (f) generating a watermark signal by combining the bit string generated from step (e); (g) inserting the watermark signal generated from the step (f) into the original barcode, and (h) restoring the barcode through a reverse frequency conversion process after the step (g). do.

In addition, the method for detecting a watermark includes the steps of (j) generating the selected barcode into a bit string by a secret key, and (k) converting the watermarked barcode into a frequency domain after step (j); (l) generating an original barcode based on the data converted from step (k), (m) extracting a watermark signal based on the data converted from step (k), and (n Extracting barcode data based on the data converted from step (k); and (o) measuring similarity between the original barcode data and the barcode data into which the watermark is inserted after step (n); Characterized in that made.

With reference to the accompanying drawings, a method for embedding and detecting a watermark of a multi-dimensional barcode according to the present invention will be understood by the embodiments described in detail below.

1 is a schematic configuration diagram of a system for embedding and detecting a watermark of a multi-dimensional bar code on-line / offline according to the present invention, and FIG. 2 is a block diagram of a terminal block between a user terminal, an operator terminal, and an issuer of FIG. Figure 3 is a block diagram of the watermark encoding means of the multi-dimensional bar code according to the present invention, Figure 4 is a general conceptual diagram for the watermark insertion and detection of the multi-dimensional bar code according to the present invention, Figure 5 is a watermark embedding of FIG. FIG. 6 is a view showing the invisible implementation, FIG. 6 is a view showing the implementation of the watermark embedding of FIG. 4 visually, FIG. 7 is a flow chart according to the watermark embedding method of the present invention, and FIG. Fig. 9 is a block diagram of a watermark decoding means of a multi-dimensional bar code according to the present invention. 10 is a flow chart of FIG. 9, FIG. 11 is a configuration diagram of a barcode reader for decoding the watermarked barcode of FIG. 9, and FIG. 12 is a diagram for detecting a watermark using the barcode reader of FIG. Detecting process flow chart.

According to FIG. 1, a user who wants to use a barcode with a watermark (Watermake) (an employee of the company at a remote location and who wants to issue) is connected to the Internet 20 using the user's computer 10 to perform predetermined authentication. After going through the procedure, various services provided by the issuing means 30 are used, and the operator manages the issuing means 30 collectively through the operator terminal 40 connected to the issuing means 30.

The issuing means 30 is connected to the operator computer 40, and receives and sets a variety of details of the production, issuance and transmission operation of the multi-dimensional barcode is inserted into the watermark by the command received from the operator computer 40 It will act as a server. The administrator of such a server manages the operation of the issuing means 30 using at least one operator computer 40.

The above authentication procedure corresponds to a normal authentication procedure for receiving a personal ID and password, etc., to determine whether the user is a qualified person, and then determining the eligibility to use various services related to subsequent production, issuance, and transmission. .

According to FIG. 2, a user who wants to use a bar code having a watermark inserted through a predetermined authentication procedure is connected to the issuing means 30 through the network interface unit 12 and is provided by the issuing means 30. Various services will be used.

In detail, when a user who wants to receive a barcode with a watermark inserted therein accesses the issuing means 30 through the Internet 20 using the user terminal 10, the user receives an ID and a password to determine whether the user is a member. After verifying the status, only the members should perform the following procedure.

The issue means 30 includes a watermark generator 32 for generating an encrypted special key selected by a setter such as a corresponding company, and the coded and encrypted generated through the watermark generator 32. Watermark embedding section 34 for embedding the watermark, and an output digital file generating section (watermark output section) for converting and generating data generated / inserted by the watermark inserting section into a digital file (watermark output section) ( 36).

The operator computer 40 which accesses the issuing means 30 through the operator computer interface 42 and manages the issuing means 30 has a multidimensional barcode (generated as a digital file) in which a watermark is inserted. A printer 50 for outputting and a barcode reader 200 for determining whether the multi-dimensional barcodes output through the printer 50 are true or false are connected.

Meanwhile, important priorities to be considered in the process of embedding and detecting watermark to be applied to the present invention through the above-described components will be described in detail below.

First, when inserting a watermark using the generated barcode, a unique key selected by the manufacturer is used, and the inserted watermark signal is used for various information such as a shipment date of the product and a manufacturing number. At this time, the inserted watermark information is encrypted by using a key and inserted. In this way, the barcode inserted with the watermark is attached to the product and circulated, and when it is necessary to determine the authenticity later, the barcode is read with a barcode reader (to be described later) to detect the inserted watermark signal.

In order to satisfy the bar code watermarking technology, first, the insertion of a watermark should not deteriorate the function of the bar code, and the watermark should be detected even if the image is damaged, such as geometric deformation. In addition, the watermark must also be detected in the analog-to-digital conversion. As the barcode is itself an information transmission medium having a special function, the insertion of a watermark should never affect this function. That is, an error should not occur in the recognition of the barcode due to the insertion of a watermark. In the embodiments of the present invention, watermark generation, insertion, detection, and accompanying signal conversion are ideally performed in view of such considerations, and will be described in detail below.

Referring to Figure 3, the encoding process will be described.

Encoding means 160 is a serialization module configured for serialization of signals inputted through user interface modules (UI Modules) 60 and the user interface modules (UI Modules) 60 provided to enable a user interface. Modules (70) and generated through the barcode generator (80) and the barcode generator (80) for generating a multi-dimensional barcode using the signal passed through the serialization module (Serialization Modules) 70 A watermark generator 90 for generating a watermark to be inserted into the barcode, a barcode encoder 100 for encoding the generated barcode, and a barcode encoder ( A watermark encoding process is performed by a printer controller 110 that prints a barcode 8 encoded and encoded with a watermark 100.

Referring to Fig. 4, a flowchart of a method for embedding and detecting a watermark of a multi-dimensional barcode is outlined.

First, the detection method from the insertion of a watermark includes a watermark insertion step of inserting the watermark into the multidimensional barcode (original data) 2 formed through the generation of the watermark and the watermark insertion step. Watermark output step of outputting the multi-dimensional bar code of the digital file with the watermark inserted through the printer 50 and watermark detection step of detecting the watermark inserted in the output multi-dimensional bar code (watermark is inserted) (8) It is made of.

The watermark generating step generates a corresponding watermark according to an option selected by the operator in the operator terminal 40, wherein any one of a key generation method, a logo method, and the key generation method and the logo method are simultaneously employed. Generate a watermark according to the publishing option.

The watermark embedding step includes inserting a watermark into the generated digital file, simultaneously inserting a strong watermark and a soft watermark into the digital file, or inserting a semiwatermark, either in a visible or invisible manner. One method is to insert a selection watermark, and this is performed through the application software (S / W) provided in the operator computer (40).

The watermark outputting step determines whether an invisible watermark embedding barcode or a visible watermark embedding barcode is used, and simultaneously outputs the multi-dimensional barcode of the digital file into which the corresponding watermark is selected by using the printer 50. do.

The watermark detection step is to check the authenticity by extracting the watermark using a barcode reader 200 capable of decoding the watermark.

Meanwhile, the watermark generating step, the watermark inserting step, and the watermark outputting step include a watermark generating unit 32, a watermark inserting unit 34, and an output digital file of the issuing means 30 shown in FIG. Each of the generating units 36 is performed.

Referring to FIG. 5, a method of invisibly embedding a watermark is described as follows. First, a unique key (SMT) selected by the manufacturer is set in the original image (multi-dimensional barcode) 2. In this way, a multi-dimensional barcode in which a watermark is inserted by inputting the original image and the setting key SMT is inputted. (Barcode) (8) is not visually confirmed, and when it is separated / detected through the barcode reader, the original original image and a key set by the user, that is, a watermark (SMT), are extracted.

Referring to FIG. 6, a method of visually inserting a watermark embedding is as follows. First, a unique key (SMT) selected by the manufacturer is set in the original image (multidimensional barcode) 2. In this way, a multidimensional barcode in which a watermark is inserted by inputting the original image and the setting key SMT is inputted. (Barcode) (8) is visually identifiable, and the key (SMT) is inserted in the original image on the background, and it is the last original image and the key set by the user when separated / detected by the barcode reader. That is, a watermark SMT is extracted.

Referring to FIG. 7, a flowchart illustrating a process of inserting a watermark into a multidimensional barcode is described in detail as follows.

First, the data to be inserted into the watermark is selected. (A) After the step (a), one of the visible and invisible watermarking methods is selected. (B) and the step (b) is selected. The multidimensional barcode (original data) is converted into the frequency domain based on the scheme. (C) In step (c), the barcode data converted into the frequency domain is converted into a bit string. The data converted from (d) is generated into logical bit streams. (e) The bit strings generated through the step (e) are combined to generate a watermark signal. (f) Step (f) And inserting the watermark signal generated from the into a barcode (original data). Step (g), and after the step (g), the barcode is restored through an inverse frequency conversion process.

Referring to FIG. 8, a decoding means for performing decoding of a watermarked multidimensional barcode is as follows.

The decoding means 170 detects the watermark inserted through the barcode reader 200 which is an optical device, but the barcode reader 200 serves as a decoder. The signal decoded by the barcode reader 200 is input to a watermark detection module 120, and thus the detected signal is analyzed by a watermark analysis module 130. The analyzed signal reproduces the watermark corresponding to the key set by the first user in the watermark generator 140, and the watermark is used by the user using the application module 150. Will check for final replication.

The barcode reader 200 is a barcode RGB reader capable of detecting data in any color or material without interference with a background screen by applying an image processing technology. In particular, the barcode reader 200 is used for reading a barcode recorded in a background color such as a color packaging material.

Referring to FIG. 9, a method of detecting whether an illegal copy is performed off-line according to the present invention will be described.

First, the barcode image is read through the barcode reader 200 on the original image 8 in which the watermark is inserted. If the barcode is the same as the original image in which the watermark is inserted, the original image 8 is read. In the case of, the unique key (SMT) set by the manufacturer, that is, the watermark, is detected, and the watermark is not detected at the time of illegal copying different from the original image, thereby confirming the authenticity. It becomes possible.

Referring to FIG. 10, a method of detecting a watermark embedded in a multidimensional barcode is as follows.

Watermark detection is a method of detecting a symbol of a watermark inserted into the original image of a multidimensional barcode by a manager such as a manufacturing company through a watermark decoding module. Is made of.

First, a multi-dimensional bar code in which a watermark is inserted is generated into a bit string by a secret key. (J) After step (j), the watermarked bar code is converted into a frequency domain. An original barcode is generated based on the data converted from (k). (l), a watermark signal is extracted based on the data converted from the step (k). (m), step (k) Bar code data is extracted based on the converted data from step (n). After step (n), the similarity between the original bar code data and the bar code data into which the watermark is inserted is measured.

Referring to Fig. 11, the configuration of the above-described barcode reader will be described.

First, referring to a system for reading barcodes, the components include a multidimensional barcode 8 with a watermark embedded therein, a scanner 212, a decoder 214, and a computer 40. The barcode reader is composed of a scanner 212 and a decoder 214 to convert the barcode 8 into a data form that the computer 40 can accept. The method of embedding and detecting watermarks of multidimensional barcodes can be subdivided into the key functional areas required for symbol reading and the auxiliary function parts required for data I / O and user interaction. The scanner 212 includes an optical scanning unit 218, a light receiving unit 220, an amplification and signal processing circuit 222, and a digital signal circuit 224. The decoder 214 includes an element edge detection circuit 226, a microprocessor 228, a ROM 230 in which a decryption algorithm is stored, a RAM 232 temporarily storing operation data, and data I / O 234, a lamp 236 and a buzzer 238 for displaying the use state for the user is configured, the data display unit 242, keyboard input unit 244, external An auxiliary storage device 248 such as a device controller 246, an IC card, a memory card, a floppy disk drive, or the like may be connected.

Hereinafter, a process of reading a multi-dimensional barcode through the above-described barcode reader will be described.

Light scanned by the optical scanning unit 218 of the scanner 212 is scanned (scanned) over the multi-dimensional barcode (8) symbol. The bar and the space of the barcode 8 symbol have different reflectances of light, and the photo detector 220 of the scanner 212 detects the amount of light and according to its size, the electric signal ( Photocurrent). Since the amount of light detected by the light receiving unit 220 is very small, the generated current also flows less, which is then amplified and signal processed through the amplification and signal processing circuit 222 to generate a useful analog signal (voltage). The generated analog signal is converted into a digital signal through the digitizing process of the digital signal circuit 224. That is, when the analog signal reaches this upper limit by setting an upper and lower threshold, the latch operates to maintain a high state, and when the lower limit reaches the threshold, the latch changes to a low state. The digital signal generated as described above generates a data value assigned to the bit pattern through digital signal processing in the decoder.

The barcode data processed as described above is temporarily stored in the RAM 232 and then transferred to the person in charge 40 through the I / O port 234 by the control operation of the microprocessor 228 to the computer 40. The authenticity of the product is determined by comparing it with the stored barcode data.

11 to 12, the decoding process of the watermarked barcode using the above-described barcode reader will be described in more detail.

First, a digital signal is received from the scanner 212. [0110] The digital signal input through the step S1 and the step S1 is converted into a time width and stored in a buffer (not shown). In step S2, the margins of the front and rear sides are checked based on the data stored in the step S2. In step S3, the bar code data is checked when the margin verification is completed through the step S3. After the step S4, the distance between the plane and the similar plane is measured, and the value (t) or the element width is measured. After the step S5, after the step S5, the start character / end character review scan is performed. (S6), and after the step (S6), the parity of the unique corresponding algorithm character unit according to each symbology is verified. (S7), after the step (s7), the corresponding character in the character table Verification and calculation of the character are performed. (S8) In step S8, after the acceleration Also, verification is performed by the company through secondary confirmation such as symbol length, gap between characters, and the like. (S9).

The method of inserting and detecting a watermark in a multidimensional barcode using the above-described method is easy to implement watermarking on a multidimensional barcode on-line and at the same time, in particular, illegally using only a barcode reader on an off-line. There is an advantage that you can easily check the authenticity of the replication.

Although the embodiments of the present invention have been described in detail as above, the scope of the present invention is not limited thereto, and the scope of the present invention extends to the range substantially equivalent to the embodiment of the present invention.

As can be seen from the above description, the watermark insertion and detection system of the multi-dimensional bar code according to the present invention has a simple configuration, thereby the process speed of the process and the production cost is also reduced.

In addition, the watermark embedding and detection method not only inserts a watermark into a multi-dimensional barcode on-line, but in particular, the watermark is inserted only by a barcode reader capable of decoding the barcode on off-line. The effect is that the modulation can be easily read.

In addition, the watermark embedding and detection method of the multi-dimensional barcode according to the present invention has the following expected effects.

First, there is an advantage that can reduce the social costs, that is, the costs incurred by companies and public institutions for illegal prevention by the effect of preventing illegal copying by watermaking.

In addition, the expansion and activation of multi-dimensional barcodes using watermaking can lead to rapid development in the barcode and logistics industries, and contribute to the development of the information and communication industry and national competitiveness by the development of information security technology. In addition, the combination of barcode and watermarking technology can contribute to the development of information protection and security industry.

In addition, the trend of the barcode industry is expected to move from one-dimensional barcodes to the multi-dimensional barcode industry. The wide use of watermarking, information content and recovery rate, and the wide use of multidimensional barcodes are expected to lead to the development of the multi-dimensional barcode industry. do.

In addition, as the method for off-line counterfeiting and copy protection is continuously developed through the present invention, it may be particularly effective in general manufacturing industry where off-line trading is commonly used. .

Finally, the development of barcode technology, which is the foundation of the logistics industry, one of the important industries for enhancing national competitiveness in the 21st century, is not only expected to spread to the logistics industry, but also to improve the information protection level of public organizations and corporate residents. At the same time, it is expected to contribute to the enhancement of the level of trust and to the establishment of a trust society by preventing illegal copying.

1 is a schematic configuration diagram of a watermark embedding and detection system of a multidimensional barcode on / offline according to the present invention.

2 is a block diagram illustrating a terminal block between a user terminal of FIG. 1, an operator terminal, and an issuer.

3 is a block diagram of a watermark encoding means of a multidimensional barcode according to the present invention;

4 is an overall conceptual diagram of watermark insertion and detection of a multidimensional barcode according to the present invention;

FIG. 5 illustrates invisibly the watermark embedding of FIG. 4.

FIG. 6 is a view showing visually performing the watermark embedding of FIG. 4; FIG.

7 is a flowchart illustrating a process according to the watermark embedding method of the present invention.

8 is a block diagram of a watermark decoding means of a multidimensional barcode according to the present invention;

9 is a diagram illustrating a method for detecting whether an illegal copy is performed off-line according to the present invention.

10 is a flow chart of FIG. 9;

11 is a block diagram of a barcode reader for decoding the watermarked barcode of FIG.

FIG. 12 is a flowchart illustrating a detecting process of a watermark using the barcode reader of FIG. 9. FIG.

Explanation of symbols on main parts of drawing

10: user terminal 30: issuing means

40: operator terminal 50: printer

100: barcode encoder 200: barcode reader

Claims (7)

In order to eliminate commercial theft such as illegal copying and counterfeiting of various contents distributed through the Internet, encoding means for encoding a watermark on a multidimensional barcode, decoding means for decoding the watermarked multidimensional barcode, and issuing means are provided for the multidimensional barcode. In the system for embedding and detecting a watermark, the encoding means generates a barcode using a user interface module, a serialization module configured for serialization of a signal input through the interface module, and a signal passed through the serialization module. A barcode generator, a watermark generator for generating a watermark to be inserted into the barcode generated by the barcode generator, and a barcode encoder for encoding the barcode generated by the watermark generator, wherein the decoding means includes a multidimensional barcode. Decoding to Detect Embedded Watermarks A bar code reader serving as a function, a watermark detection module for receiving a signal decoded through the bar code reader and converting the signal, a watermark analysis module for analyzing a signal detected by the watermark detection module, and the water It includes a watermark generator for receiving the signal analyzed through the mark analysis module to restore the watermark set by the first user, the issuing means for generating an encrypted special key (key) selected by the setter, such as the relevant company Digital output for generating and converting a watermark generating unit, a watermark inserting unit for inserting the coded and encrypted watermarks generated by the watermark generating unit and data generated / inserted through the watermark inserting unit into a digital file. A user who wants to receive a file generator (watermark output unit) and a barcode with a watermark inserted on the Internet When the user accesses through the ID and password, and authenticates whether the accessor is a member and then performs the following procedure only if the member, the watermark generation unit and the key generation method, the logo method and the key generation method The watermark is generated by one of the methods employing the logo method simultaneously, and the multidimensional barcode is a multidimensional barcode that is capable of storing a large amount of data and is capable of storing and transmitting data. Watermark embedding and detection system. delete delete delete delete (a) selecting data to be inserted as a watermark; (b) selecting a watermark to be used by selecting one of visible or invisible watermarking after step (a); (c) converting the original barcode into the frequency domain based on the scheme selected from step (b); (d) converting the barcode data converted from step (c) into a bit string; (e) generating a bit string with a secret key after step (d); (f) generating a watermark signal by combining the bit strings generated from step (e); (g) inserting the watermark signal generated from step (f) into the original barcode; (h) restoring the barcode through an inverse frequency conversion process after step (g): (j) generating the selected barcode into a bit string by a secret key; (k) converting the watermarked barcode into a frequency domain after step (j); (l) generating an original barcode based on the data converted from step (k); (m) extracting a watermark signal based on the data converted from step (k); (n) extracting bar code data based on the data converted from step (k); (o) measuring the similarity between the original barcode data and the barcode data into which the watermark is inserted after step (n). delete