JP4512197B2 - Watermark data embedding method, apparatus, program, and system by area division - Google Patents

Description

  The present invention relates to a technique for embedding information that is difficult for a person to read, other than visible print information, for each print area.

  A method of embedding confidential information that cannot be easily tampered with in a form that cannot be visually recognized in order to prevent a document printed on paper from being tampered with or copied. (Patent Document 1).

  In order to improve the reading accuracy of the input image read from the input device such as a scanner, this technique is that a plurality of types of dot patterns are regularly arranged, and at least one type of dot pattern among them is given specific confidential information. Features. This makes it possible to accurately extract confidential information from document information.

  In addition, there is an information embedding technique in a printed matter in a screen code format in which the information density is several times higher than that of a two-dimensional code in order to specify a falsification place of the print content (Patent Document 2).

  This technique records a large amount of data information using a screen code that describes a data code according to the arrangement of halftone dots printed on paper, its shape, position, direction, number of halftone dots and color differences.

JP 2003-101762 A JP 2005-102264 A

  The above-described conventional technique embeds watermark information uniformly and repeatedly on a piece of paper, and the embedded information can be read regardless of which part on the paper is detected. This is effective for restoring the information before falsification from the embedded information based on the information on the linked database when performing falsification detection.

  However, when another character string data related to and corresponding to character string data that is visually printed is embedded as watermark information, it is difficult to associate it with visible character string data.

  When the same watermark information is repeatedly embedded, the capacity of the watermark data is limited in order to embed related information for each visible character string data.

  The present invention solves the above problem by a region dividing method.

  The present invention converts character code data corresponding to and related to character string data to be visibly printed into watermark data having a copy-forgery-inhibited watermark data format, and the watermark data corresponding to the character string data is stored on the memory. Each area to be stored is set, character string data and corresponding watermark data are combined and stored in each area, and each set of the combined character string data and watermark data is printed out as document information to the printer. Forward.

  The present invention also inputs this document information and stores it in the memory, identifies and excludes character string data in the document information, divides each area occupied by the watermark data on the memory, and embeds it in each area The watermark data is restored and character code data is generated.

  In the present invention, it is possible to watermark information that is not visualized from the viewpoint of personal information protection, for example, by printing watermark data corresponding to the print area of the visualized data printed on paper. That is, by embedding information that is desired to be disclosed only to a specific organization or the like as watermark data for each visualized print data item, the data can be disclosed only to the organization having a system that can read the watermark data.

  In addition, by dividing the watermark data into regions and embedding different information, it is possible to embed more types of information than conventional watermark data. Further, when the embedded data is read, data entry can be performed for each item without performing an input operation by combining with the visualization data associated in advance.

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

  Example 1 will be described below. Example 1 is an embodiment in which contract renewal work in the insurance field is taken as an example.

  FIG. 1 shows a hardware configuration of a system including “contract company / organization”, “agent”, and “service company” related to insurance contract renewal work. “Service company” corresponds to an insurance company. These organizations are independent organizations and are not connected by an information network, and it is assumed that information transmission between organizations is performed on a paper basis such as application documents and a storage medium 51 basis. In FIG. 1, thin arrows indicate the flow of data, and thick arrows indicate the flow of application documents.

  As shown in FIG. 1, a contract company / organization 1 includes a management terminal 11 for inputting / outputting information on employees / members in a company / organization, an employee / member storing information on employees / members in the company / organization. It is composed of a member DB (database) 12 and a printer 13 for outputting to paper through the management terminal 11.

  The agent 2 receives an operation terminal 21 for inputting / outputting policyholder information, an employee / member contract DB 22 storing the existing contract information of the employee / member, and contract application documents sent from the contract company / organization 1. It comprises a scanner 23 for reading and digitizing.

  The service company 3 includes a contract management server 31 that manages the original information of the policyholder, a contract master 32 that stores the information, and a scanner 33 that reads and digitizes the contract application documents sent from the agency 2. It is configured.

  FIG. 2 shows the data related to the contract company / organization 1 and the configuration of the processing unit. As shown in FIG. 2, the processing unit of the management terminal 11 generates renewal application list creation processing 111 for creating a contract renewal application target list, and converts specific data into watermark data for each piece of data constituting the created list. Processing 112, watermark data printing region dividing processing 113 for setting a watermark data printing region for each piece of data, and watermarked character / graphic image combining processing 114 for combining the visualization data such as characters and graphics with the watermark data. Yes.

  The employee / member DB 12 includes an employee member database 121 that stores employee / member information, and a contracted contract database 122 that stores data of contracted contracts. The existing contract database 122 is data extracted and transferred from the employee / member contract DB 22 of the agency 2.

  The watermarked character / graphic image printing process 131 of the printer 13 prints the data sent from the watermarked character / graphic image combining process 114 of the management terminal 11.

  FIG. 3 shows the data regarding the agency 2 and the configuration of the processing unit. As shown in FIG. 3, the processing unit of the operation terminal 21 includes a character / graphic exclusion process 211 that excludes characters / graphics visualized in order to extract watermark data from image data read by the scanner 23, Watermark region boundary division processing 212 for specifying a boundary, coding processing 213 for each watermark region that performs coding for each divided watermark region, characters / graphics that associate excluded character / graphic data with coded watermark data Data / watermark data association processing 214 and contract information registration processing 215 for registering the associated data in the employee / member contract DB 22 as contract information.

  The employee / member contract DB 22 includes an employee / member contract database 221 for storing employee / member contract data.

  The scanner 23 includes a watermarked print document reading process 231 that reads a watermarked print document printed on paper, converts it into image data, and sends the image data to the operation terminal 21.

  FIG. 4 shows the data relating to the service company 3 and the configuration of the processing unit. As shown in FIG. 4, the processing unit of the contract management server 31 extracts a character / graphic data extraction process 311 for extracting only the character / graphic data visualized from the image data read by the scanner 33, and extracts the extracted character / graphic data. Character / graphic data encoding process 312 to be encoded, contract data collation process 313 for collating with contract data based on the data stored in the contract master 32, and confirming the changed part, etc., and the confirmed change After the data correction of the location, the contract master registration process 314 for registering the contract information in the contract master 32 is configured.

  The contract master 32 is composed of a contract database 321 that reads contract information for collating existing contract data and stores new contract information.

  The scanner 33 includes a character / graphics print document reading process 331 that reads a print document printed on paper, converts it into image data, and sends the image data to the contract management server 31.

  The management terminal 11, the operation terminal 21, and the contract management server 31 are each a computer including a CPU, a memory, and a storage device, and each processing unit is realized by executing a program stored in the memory by the CPU. The employee / member DB 12, the employee / member contract DB 22, and the contract master 32 are databases stored in the storage device of these computers or the storage device of another database server.

  FIG. 5 shows a table configuration of the employee / member database 121. The employee / member database 121 stores a name 1211 for storing employee / member name data, an employee / member number 1212 for storing an employee / member-specific number, and department data of each employee / member. Each data item includes an assigned department 1213, a post 1214 that stores post data, an age 1215 that stores age data, and an extension 1216 that stores an extension number.

  FIG. 6 shows a table configuration of the existing contract database 122. The contracted contract database 122 includes an employee / member number 1212 for storing the number of the employee / member, a name 1211 for storing the name of the employee / member, a presence / absence of contract 1223 for storing data for identifying the presence / absence of the contract, Each data item includes a contract type 1224 for storing each contract type and a contract date 1225 for storing the contract date for the corresponding contract.

  FIG. 7 shows the configuration of the employee / member contract table 1110 created in the memory by the renewal application list creation processing 111. The employee / member contract table 1110 inputs an employee / member number 1212 for storing the employee / member number, a name 1211 for storing the name of the employee / member, a department 1213 for storing the department, and an extension number. Each data item includes an extension number 1216, a contract type 1224 for storing the contract type, and a contract date 1225 for storing the contract date.

  FIG. 8 shows the configuration of the employee / member contract database 221 storing the watermark code, the restored watermark data, and the non-watermark data. The employee / member contract database 221 includes a watermark code 2211 for storing a watermark code with a unique identifier, an employee / member number 1212 for storing an employee / member number as restored watermark data, and a department to which the employee belongs. It is composed of data items such as a department 1213 to be stored and an extension number 1216 for storing an extension number, and further includes data items such as a name 1211 for storing a name as a non-watermark data item.

  FIG. 9 shows a table configuration of a contract database 321 that stores contractor information. The contract database 321 stores a security number 3211 for storing a number unique to a security such as insurance issued for each contractor, a name 1211 for storing the name of the contractor, a contract type 1224 for storing the contract type, and a contract date. It consists of data items such as contract date 1225.

  Next, an image printed by combining characters and watermark data by the printer 13 is shown in FIG. FIG. 10 is a print example 1000 of the contractor list data in the group insurance contract. As shown in FIG. 10, characters / graphics 1010 as visualization data and watermark printing 1020 corresponding to each visualization data are printed over the entire area occupied by the visualization data. In FIG. 10, for the convenience of illustration, the boundary of the area is temporarily shown by a broken line. A portion surrounded by two adjacent broken lines is an area where watermark data is printed. Another watermark data is printed in an area adjacent to a certain area (1030). A detailed image of watermark printing is printed by a ground pattern watermark, which is one of the watermark techniques, as shown in a magnified portion 1021. In the background pattern watermark, a plurality of minute points are arranged according to a certain rule, and watermark data is expressed. A mist code (Mist-Code), a known dot pattern, a screen code, or the like can be used as the copy-forgery-inhibited watermark code.

FIG. 11 is a diagram for explaining a method of setting different watermark data print areas on the memory. As shown in FIG. 11, a case where a print character string “◯◯◯...” 2010 and a print character string “ΔΔΔ. The watermark data print area corresponding to each visualization data is from the middle line to the middle line between the adjacent visualization data. For example, when the coordinate of the vertical center line of the print character string 2010 is y ₁ and the print character string 2020 is y ₂ , the boundary position of the watermark data print area is an intermediate point between y ₁ and y ₂ (y ₁ + ay ₁ or y ₂ -ay ₁ ). Here, the print area boundary width ay ₁ is ay ₁ = (y ₂ −y ₁ ) / 2.

FIG. 12 shows an image obtained by extracting a ground pattern representing watermark data from image data read by the scanner 23. As shown in FIG. 12, in the read image data 3000, the operation terminal 21 first detects a start line yb ₀ on which watermark data is printed. Next, the operation terminal 21 recognizes an area from the start line to the intermediate line where the watermark data changes as one watermark data print area. For example, if a y-coordinate yb _x that changes the rule of the dot pattern constituting the watermark data is detected, the y-coordinate yb _{x + 1} that increases the y-coordinate by a small amount Δy and then changes the watermark data is detected. The watermark data print area 3010 is determined to be an area between yb _x and yb _{x + 1} .

  FIG. 13 shows a schematic procedure of the processing in the first embodiment. FIG. 13 shows the flow of processing within each organization of the contract company / organization 1, the agency 2, and the service company 3, and the information linkage between the organizations. The solid line arrows indicate the flow of the application documents, and the broken line arrows indicate batch transmission of data using a medium or the like. Among the general procedures, steps 1100 to 1900 represent processing procedures in the contracted company / organization 1, steps 2100 to 2600 represent processing procedures in the agency 2, and steps 3100 to 3500 represent processing procedures in the service company 3. .

  First, the flow of processing in the contract company / organization 1 is shown. In step 1100, the management terminal 11 reads employee / member data from the employee / member database 121. Next, the management terminal 11 reads employee / member data for the existing contract from the existing contract database 122 in step 1200.

  Next, the management terminal 11 creates new contract renewal list data by collating the employee / member data read in step 1100 and the existing contract data in step 1300. Details of step 1300 will be described later with reference to FIG.

  Next, in step 1400, the management terminal 11 extracts character code data of data items that the service company 3 does not want to be known, such as employee number and department name, from the renewal contract data as watermark target data.

  Next, in step 1500, the management terminal 11 converts the watermark data extracted in step 1400 into a watermark code. Details of step 1500 will be described later with reference to FIG. Next, the management terminal 11 associates the print data visualized in step 1600 with the watermark data related to the visualized data. Here, the one-to-one correspondence between the two is performed.

  Next, in step 1700, the management terminal 11 determines the watermark data print area associated with the memory. Details of step 1700 will be described later with reference to FIG.

  Next, the management terminal 11 combines the watermark data set in step 1800 with the visualized print data including the watermark code used for the association, and creates data that is actually printed on paper. Since the watermark data is represented by a dot pattern, the visualization data is also converted into a dot pattern, and the two data are combined by taking the logical sum of both dot patterns. Next, the management terminal 11 transfers the print data created in step 1900 to the printer 13 and prints it on the paper via the printer 13.

  Next, the flow of processing in the agency 2 is shown. The operation terminal 21 reads the watermarked printed material output in step 1900 by the scanner 23 in step 2100. Next, the operation terminal 21 excludes the visualized characters / graphics from the image data read in step 2100 in step 2200 and sets only the watermark data. That is, the print characters 2010 and 2020 shown in FIG. 11 recognized as character information are excluded, and only the background pattern shown in FIG. 12 is left. For character string data, a character recognition technique can be used to characterize a series of dot patterns recognized as characters and to change the character dot pattern from value 1 to value 0, thereby excluding character string data. For graphic data, the graphic data can be excluded by cutting out the graphic area, saving the graphic data, and changing the graphic area to a blank area having a value of zero.

  Next, the operation terminal 21 specifies an area boundary between different watermark data in step 2300. Details of step 2300 will be described later with reference to FIG.

  Next, the operation terminal 21 restores each watermark data specified at step 2300 to the original data at step 2400. Details of step 2400 will be described later with reference to FIG.

  Next, the operation terminal 21 associates the character / graphic data excluded in step 2200 in step 2500 with the watermark data restored in step 2400. Details of step 2500 will be described later with reference to FIG.

  Next, the operation terminal 21 stores in the employee / member contract database 221 as renewal contract information for each piece of data associated in step 2500 in step 2600.

  Next, the flow of processing in the service company 3 is shown. The contract management server 31 reads the watermarked printed matter output in step 1900 by the scanner 33 in step 3100. Next, in step 3200, the contract management server 31 extracts only the visualized character / graphic data from the image data read in step 3100. Next, in step 3300, the contract management server 31 encodes the character / graphic data extracted in step 3200 (converts from image data to electronic data).

  Next, the contract management server 31 collates with existing contract data stored in the contract database 321 in step 3400 to identify data that needs to be corrected, such as a changed part. Next, the contract management server 31 updates the contract database 321 for the data specified in step 3400 in step 3500. Above, description of the process outline procedure of Example 1 is completed.

  Next, details of the processing in step 1300 shown in FIG. 13 will be described with reference to FIG. In step 1301, the management terminal 11 extracts only the data of the contract renewal target person from the employee / member database 121 and the existing contract database 122. Next, in step 1302, the management terminal 11 merges data such as employee / member number, name, department, extension number, insurance contract type and initial contract date for each contract target employee / member. Stored in the member contract table 1110. This is the end of the detailed description of step 1300.

  Next, details of the processing in step 1500 shown in FIG. 13 will be described with reference to FIG. The management terminal 11 combines the data items extracted in step 1400 among the items stored in the employee / member contract table 1110 in step 1501 for each name, and assigns a watermark code that is a unique ID. The watermark code is extracted from the encoded character / graphic data. Next, the management terminal 11 converts each target data of the watermark code assigned in step 1502 into watermark data. The process of converting character information into a dot pattern is known as a tint block watermark technique. Each piece of data includes a given watermark code, converted watermark data, and non-watermark data that is not converted. This is the end of the detailed process of step 1500.

Next, details of the processing in step 1700 shown in FIG. 13 will be described with reference to FIG. In step 1701, the management terminal 11 sets the print position (coordinate y ₁ ) of the print data that should be visibly printed on the memory. Next, the management terminal 11 sets the print position (coordinates y ₀ ) of the adjacent print data before the print position set in step 1702. Without previous printing data, the printing position y ₀ tentative. Next, the management terminal 11 sets the print position (coordinate y ₂ ) of print data adjacent to the print position set in step 1703. Without after the printing data, the printing position y ₂ of the provisional.

  Next, in step 1704, the management terminal 11 calculates the watermark print area boundary width with the print data immediately before the print position in accordance with Equation 1.

ay ₀ = (coordinate y ₁ −coordinate y ₀ ) / 2 (Equation 1)
Next, in step 1705, the management terminal 11 calculates the watermark print area boundary width with the print data immediately after the print position according to Equation 2.

ay ₁ = (coordinate y ₂ -coordinate y ₁ ) / 2 (Equation 2)
Next, the management terminal 11 changes the watermark data print area corresponding to the visualized data from (y ₁ -ay ₀ ) to (y ₁ + ay ₁ ) based on the watermark print area boundary width calculated in steps 1704 and 1705 in step 1706. ) And confirm.

  Next, in step 1707, the management terminal 11 determines whether there is print data next. If there is print data as a result of the determination, the processing from step 1701 is repeated. On the other hand, if there is no next print data, this process is finished. This is the end of the detailed description of step 1700.

Next, details of the processing in step 2300 shown in FIG. 13 will be described with reference to FIG. The operation terminal 21 specifies the watermark data print start position (coordinate yb ₀ ) from the image data read from the scanner 23 in step 2301.

Next, the operation terminal 21 specifies boundary positions (coordinates yb _x ) and (coordinates yb _{x + 1} ) where a watermark data pattern different from the target watermark data pattern exists in step 2302.

  Next, as specified in step 2301 in step 2303, the operation terminal 21 specifies an area surrounded by two adjacent boundary positions as one watermark data print area 3010.

  Next, the operation terminal 21 determines whether or not the next different watermark data pattern exists in step 2304. As a result of the determination, if a different watermark data pattern exists, the process goes to step 2302. On the other hand, if there is no different watermark data pattern, this process is terminated. This is the end of the detailed description of step 2300.

Next, details of the processing in step 2400 shown in FIG. 13 will be described with reference to FIG. In step 2401, the operation terminal 21 sets the watermark data print area closest to the watermark data print position (coordinate yb ₀ ) as the target watermark area. Next, the operation terminal 21 restores the watermark data of the target watermark print area set in Step 2402. This is a process of inversely converting a dot pattern into character information, and is known as a tint block watermark technique.

  Next, in step 2403, the operation terminal 21 determines whether or not the next watermark printing area exists. If the result of determination is that the next watermark print area exists, the next watermark print area is set as the target watermark data print area in step 2404, and the process goes to step 2402. On the other hand, if the next watermark print area does not exist, this process is terminated. This is the end of the detailed description of step 2400.

  Next, details of the processing in step 2500 shown in FIG. 13 will be described with reference to FIG. The operation terminal 21 encodes the character / graphic data excluded in step 2200 in step 2501. Next, the operation terminal 21 extracts a watermark code from the character / graphic data encoded in step 2501 in step 2502. Next, the operation terminal 21 specifies watermark data having the same watermark code as the character / graphic data encoded in step 2503 and performs one-to-one association. This is the end of the detailed description of step 2500. This is the end of the description of the first embodiment.

  Example 2 will be described below. The second embodiment relates to the scheme for setting the print area for different watermark data shown in FIG. 11, and sets the watermark print area using two-dimensional coordinates.

  FIG. 20 conceptually shows watermark data print area settings for print data such as characters and figures arranged two-dimensionally. As shown in FIG. 20, a print character string “XXX” 4010, a print character string “□□ ...” 4020, a print character string “ΔΔΔ...” 4030, and a print character string A case where “◇◇ ...” 4040 is printed will be described. Each print character string corresponds to one data item. The watermark data print area corresponding to each print item is in the vertical direction (y direction) and the horizontal direction (x direction) from one adjacent piece of data or from an intermediate line to an intermediate line between the data items. However, the data item at the left end and the data item at the right end may start from an arbitrary x coordinate in the left end margin or the right end margin or end at an arbitrary x coordinate.

  For example, the boundary position between the print character string 4010 and the print character string 4030 is set by the method described with reference to FIG. 11. In the case of the print character string 4020 and the print character string 4040, the boundary position is set as follows. .

Printing characters x ₁ coordinates on the side of the endpoint column 4010 is adjacent to the print string _4020, the print string 4020 to the coordinates of the side of the end point and the adjacent print string 4010 and x _2, the boundary of the watermark data print area position is the _{x 1} and _{x 2} of the intermediate line _(x 1 + ax ₁ or _x 2 -ax _1). x ₁ and x ₂ can be calculated from the character size and the character pitch. Here, ax ₁ is a print area boundary width.

  Next, FIG. 21 shows a flow of processing for determining the watermark data printing boundary coordinates according to the second embodiment. Note that the processing flow shown in FIG. 21 corresponds to steps 1701 to 1707 described in FIG.

First, in step 1711, the management terminal 11 sets the printing boundary coordinates at the left end of the line. Next, in step 1712, the management terminal 11 sets the position (coordinate x ₁ , coordinate X _2, etc.) of the print end of the target data item.

  Next, in step 1713, the management terminal 11 calculates the watermark print area boundary width between adjacent data items according to Equation 3 except for the right end of the line.

ax ₁ = (coordinate x ₂ -coordinate x ₁ ) / 2
Next, in step 1714, the management terminal 11 determines the watermark printing boundary coordinates between adjacent data items as (x ₁ + ax ₁ ). However, in the case of the right end of the line, the print boundary coordinates are set in advance.

  Next, in step 1715, the management terminal 11 determines the print area of the watermark data corresponding to the data item to be printed from the immediately preceding print boundary coordinate to the immediately following print boundary coordinate. For the first data item on the line, the immediately preceding print boundary coordinates are those set in step 1711. For the last data item on the line, the print boundary coordinate immediately after is the print boundary coordinate on the right end of the line. Other print boundary coordinates are determined in step 1714.

  Next, in step 1716, the management terminal 11 determines whether there is a next data item. If there is a next data item, the process returns to step 1712 to repeat the above processing. If there is no next data item, the process ends.

  By performing the same processing as in steps 1711 to 1716 and the steps described in FIG. 16, a watermark print area can be set for the corresponding data item. This is the end of the description of the second embodiment.

  In the above embodiment, the application for insurance contract renewal business has been described as an example. However, the present invention is not limited to this application and is widely used. The management terminal 11 is replaced by a computer that executes a watermark data conversion process 112, a watermark data print area division process 113, and a watermarked character / graphic image combination process 114 as part of another application. The operation terminal 21 is replaced by a computer that executes a watermarked print document reading process 231, a character / graphic area exclusion process 211, a watermark area boundary segmentation process 212, and a coding process 213 for each watermark area. It is also possible to configure a system composed of these two computers.

  It can be applied to business systems such as group contracts through agencies, etc., using paper in the financial field, such as group insurance contract renewal procedures.

It is a figure which shows the structure of the system of embodiment. It is a block diagram of the data regarding the contract company and group of an embodiment, and a processing part. It is a block diagram of the data regarding the agency of embodiment, and a process part. It is a block diagram of the data regarding the service company of an embodiment, and a processing part. It is a block diagram of the employee / member database of the embodiment. It is a block diagram of the existing contract database of embodiment. It is a block diagram of the employee and member contract table of embodiment. It is a block diagram of the employee and member contract database of embodiment. It is a block diagram of the contract database of embodiment. It is an example of printing contractor list data synthesized with watermark data. It is a figure explaining the system which sets the printing area | region of different watermark data. It is a figure which shows the image which extracted the tint block expressing watermark data. It is a figure which shows the schematic procedure of the process of embodiment. It is a detailed procedure figure of Step 1300 of an embodiment. It is a detailed procedure figure of Step 1500 of an embodiment. It is a detailed procedure figure of Step 1700 of an embodiment. It is a detailed procedure figure of Step 2300 of an embodiment. It is a detailed procedure figure of Step 2400 of an embodiment. It is a detailed procedure figure of Step 2500 of an embodiment. FIG. 10 is a diagram illustrating a method of setting a print area for watermark data arranged two-dimensionally according to a second embodiment. FIG. 10 is a detailed procedure diagram of Step 1700 of Embodiment 2.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 112 ... Watermark data conversion process, 113 ... Watermark data printing area division | segmentation process, 114 ... Watermarked character and figure image synthetic | combination process, 211 ... Character / graphics area exclusion process, 212 ... Watermark area | region boundary division | segmentation process, 213 ... Encoding process, 231... Watermarked print document reading process,

Claims (20)

In a computer having a CPU and memory,
The memory has a plurality of areas each for storing watermark data having a data format of a tint block watermark,
As a processing means realized by executing the program stored in the memory by the CPU,
The character code data to which the watermark code is assigned by adding the watermark code extracted from the encoded character string data to the character code data corresponding to and related to the character string data to be visually printed, Means for converting the watermark data represented by a dot pattern;
Means for setting each of the areas including a print position of the character string data on the memory;
Means for converting the character string data into a dot pattern, combining the character string data with the watermark data corresponding to the watermark data, and combining them to store in each of the regions;
A computer having means for transferring each set of the combined character string data and the watermark data to a printer for printing out. 2. The computer according to claim 1, wherein the character string data is one data including a plurality of data items. An area between both intermediate lines of the vertical print positions of the character string data adjacent in the vertical direction with the vertical print position of one character string data as a center line is set as the area. The computer according to claim 1. 2. The computer according to claim 1, wherein the character string data is data of one data item. An intermediate line of both the vertical print positions of the character string data adjacent in the vertical direction with the vertical print position of the single character string data as a center line, and one of both print ends of the single character string data. 5. The computer according to claim 4, wherein an area surrounded by two intermediate lines between the nearest print ends of each of the character string data adjacent in the horizontal direction is set as the area. In a computer having a CPU and memory,
As a processing means realized by executing the program stored in the memory by the CPU,
Means for inputting document information of a document in which a plurality of sets of character string data printed visually and watermark data combined with the character string data and having a watermark pattern data format are printed and stored in the memory When,
Means for excluding the character string data by changing the dot pattern value 1 recognized as the character string data of the document information to a value 0;
Means for distinguishing each area occupied by the watermark data on the memory by detecting a start position or boundary position of the area;
And a means for restoring the watermark data embedded in each of the regions and generating character code data associated with the character string data by a watermark code extracted from the character string data . The computer according to claim 6, wherein the character string data is one data including a plurality of data items. A boundary line where a rule of a dot pattern constituting the watermark data changes is determined as a boundary line of the region by increasing the vertical coordinate of the document by a minute amount from a start line of the watermark data. Item 7. The computer according to item 6. The processing means realized by executing the program stored in the memory by the CPU further includes means for recognizing the character string data of the document information and converting it into a character code string. The computer according to claim 6. In the calculator,
The character code data to which the watermark code is assigned by adding the watermark code extracted from the encoded character string data to the character code data corresponding to and related to the character string data to be visually printed, Function to convert to watermark data expressed in dot pattern, which has the data format of tint block watermark,
A function of setting each area for storing the watermark data including the print position of the character string data on the memory of the computer;
Converting the character string data into a dot pattern, combining the character string data and the watermark data corresponding to the watermark data by combining them, and storing them in each of the regions; and A program for realizing a function of transferring each set of character string data and the watermark data to a printer for printing out. The program according to claim 10, wherein the character string data is one piece of data including a plurality of data items. An area between both intermediate lines of the vertical print positions of the character string data adjacent in the vertical direction with the vertical print position of one character string data as a center line is set as the area. The program according to claim 10. The program according to claim 10, wherein the character string data is data of one data item. An intermediate line of both the vertical print positions of the character string data adjacent in the vertical direction with the vertical print position of the single character string data as a center line, and one of both print ends of the single character string data. 14. The program according to claim 13, wherein an area surrounded by two intermediate lines between the nearest print ends of each of the character string data adjacent in the horizontal direction is set as the area. In the calculator,
A function of inputting document information of a document in which a plurality of sets of character string data printed visually and watermark data combined with the character string data and having a watermark pattern data format are printed and stored in the memory ,
A function of excluding the character string data by changing the dot pattern value 1 recognized as the character string data of the document information to a value 0;
Wherein each of the regions in which the watermark data in the memory is occupied, the ability to segment by detecting the start position or the boundary position of the region, and restore the watermark data embedded in each of the regions, the string A program for realizing a function of generating character code data associated with the character string data by a watermark code extracted from data . 16. The program according to claim 15, wherein the character string data is one piece of data including a plurality of data items. A boundary line where a rule of a dot pattern constituting the watermark data changes is determined as a boundary line of the region by increasing the vertical coordinate of the document by a minute amount from a start line of the watermark data. Item 15. The program according to Item 15. The program according to claim 15, further causing the computer to realize a function of recognizing the character string data of the document information and converting it into a character code string. A method realized by the CPU executing a program stored in the memory of a computer having a CPU and a memory,
The character code data to which the watermark code is assigned by adding the watermark code extracted from the encoded character string data to the character code data corresponding to and related to the character string data to be visually printed, It has the data format of the tint block watermark and converts it into watermark data expressed by a dot pattern.
An area for storing the watermark data including the print position of the character string data is set on the memory,
The character string data is converted into a dot pattern, combined by taking the logical sum of the dot pattern of the watermark data corresponding to the character string data, and stored in each of the regions,
A watermark data embedding method by area division, wherein each set of the combined character string data and watermark data is transferred to a printer for printing. In a system having a first computer and a second computer each comprising a CPU and a memory,
The memory of the first computer has a plurality of areas for storing watermark data each having a data format of a tint block watermark;
The first calculator is:
The character code data to which the watermark code is assigned by adding the watermark code extracted from the encoded character string data to the character code data corresponding to and related to the character string data to be visually printed, Means for converting the watermark data represented by a dot pattern;
Means for setting each of the areas including a print position of the character string data on the memory;
Means for converting the character string data into a dot pattern, combining the character string data with the watermark data corresponding to the watermark data, and combining them to store in each of the regions;
Means for transferring each set of the synthesized character string data and the watermark data to a printer for printing out as document information;
The second calculator is
Means for inputting the document information and storing it in the memory;
Means for excluding the character string data by changing the dot pattern value 1 recognized as the character string data of the document information to a value 0;
Means for distinguishing each area occupied by the watermark data on the memory by detecting a start position or boundary position of the area;
Means for restoring the watermark data embedded in each of the regions and generating character code data associated with the character string data by a watermark code extracted from the character string data .

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