JP2006293773A - Electronic document converting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electronic document converting device for converting a document written by a camera pen using infrared light as input light such that it can be inexpensively printed by a normal printer. <P>SOLUTION: A step is provided for converting all colors of elements included in a first electronic document into coloring material amounts of the printer, and converting the first electronic document into a second electronic document having a predetermined format. A step is provided for generating a two-dimensional pattern inherent to the second electronic document. A step is provided for converting the two-dimensional pattern into a black coloring material amount of the printer, and superimposing it on the second electronic document. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention includes a unique two-dimensional pattern or the like from an electronic document that is an original document of a paper document to be written in order to associate an addition by a handwriting input device to a paper document on which the electronic document is printed with the original electronic document. The present invention relates to an electronic document conversion method for converting into an electronic document for printing.

  Using a pen (camera pen) equipped with a camera, the camera captures a two-dimensional pattern on the paper while writing the two-dimensional pattern in which the coordinate information is embedded together with the document contents on the printed paper. There is a technique of digitizing a writing on paper by reading a pattern, inputting it into a computer, and managing it in association with an electronic document to be written. Patent Document 1 discloses a two-dimensional pattern used for such applications and a method for generating the two-dimensional pattern.

On the other hand, when a document image is formed on an information display medium on which a code (two-dimensional pattern) is formed with an image forming material using a near-infrared absorbing dye, an image is formed with a color material that absorbs the code in the infrared, Patent Document 2 discloses an image forming method and apparatus that does not affect code recognition by forming an image of a document with a color material that does not absorb infrared light.
JP 2004-94907 A JP 2002-240387 A

  By the way, when a document is superimposed on the two-dimensional pattern shown in Patent Document 1 and printed on paper, the two-dimensional pattern is hidden by the document even if it is printed by a monochrome or color printing device (printer). Even if the document is retouched, the two-dimensional pattern cannot be read from the image captured by the camera pen, and the input of the retouching computer, which is the original purpose, cannot be achieved. In this case, the camera mounted on the camera pen is a visible light camera.

  On the other hand, Patent Document 2 describes a camera pen system that uses infrared light to illuminate a camera and allows the camera to input only infrared wavelengths. In this case, the paper document read with the camera pen is printed with ink that absorbs the infrared region (black containing pigment or stealth ink that absorbs only the infrared region) for the two-dimensional pattern, and red for the document. Printed with ink (cyan, magenta, yellow) that does not absorb the outer area. According to this method, since the camera uses only infrared light as input light, the two-dimensional code can be read without being interrupted by characters or images of the document, and the above-described problems are solved.

  However, the method or apparatus for creating a paper document disclosed in Patent Document 2 is realized inside the printing apparatus. The printing apparatus receives a two-dimensional code, prints it in black, and prints the document with color ink. A mechanism to do is necessary. Therefore, in order to use this handwriting input system, the user needs a special printing apparatus and dedicated software, which is expensive.

  The present invention has been proposed in view of the above-described conventional problems, and its object is to write with a camera pen using infrared light as input light without introducing a special printing apparatus. An object of the present invention is to provide an electronic document conversion method for converting a document so that the document can be printed at low cost by a normal printing apparatus.

  In order to solve the above-described problems, according to the present invention, as described in claim 1, the first electronic document is displayed with the colors of all the elements included in the first electronic document. Converting the color material amount into a second electronic document having a predetermined format; generating a two-dimensional pattern unique to the second electronic document; and The gist of the present invention is an electronic document conversion method including a step of converting the amount of black material into the amount of black material and superimposing the amount on the second electronic document.

  In addition, as described in claim 2, in the electronic document conversion method according to claim 1, the step of generating the two-dimensional pattern includes a step of issuing an ID unique to the second electronic document; And a step of generating a two-dimensional pattern in which the ID is encoded two-dimensionally.

  Further, as described in claim 3, in the electronic document conversion method according to claim 1, the step of generating the two-dimensional pattern includes a step of issuing an ID unique to the second electronic document; The method may comprise a step of two-dimensionally arranging minute two-dimensional pattern units in which the ID and the coordinates of the second electronic document are two-dimensionally encoded.

  According to a fourth aspect of the present invention, in the electronic document conversion method according to any one of the first to third aspects, the elements constituting the two-dimensional pattern may be minute dots. .

  According to a fifth aspect of the present invention, the step of converting the color of all the elements included in the electronic document into the color color material amount of the printing apparatus and the image document, as described in claim 5, and the image document Generating a unique two-dimensional pattern image, and converting the color of the two-dimensional pattern image into a black material amount of a printing apparatus and superimposing it on the image document.

  In addition, as described in claim 6, in the electronic document conversion method according to claim 5, the step of generating the two-dimensional pattern image includes a step of issuing an ID unique to the image document, and two-dimensional And a step of generating a two-dimensional pattern image in which the ID is encoded.

  In addition, as described in claim 7, in the electronic document conversion method according to claim 5, the step of generating the two-dimensional pattern image includes a step of issuing an ID unique to the image document, and two-dimensional In other words, the method includes a step of two-dimensionally arranging a minute two-dimensional pattern unit in which the ID and the coordinates of the image document are encoded.

  In addition, as described in claim 8, in the electronic document conversion method according to any one of claims 5 to 7, the element constituting the two-dimensional pattern image is a minute dot. it can.

  In addition, as described in claim 9, in the electronic document conversion method according to any one of claims 4 and 8, the minute dots are black circle objects, black square objects, black straight line objects, character lines, It can be any period.

  The electronic document conversion method according to any one of claims 1 and 5, wherein the two-dimensional pattern and the two-dimensional pattern image are a monochrome binary having a plurality of minute dots. It can be an image.

  The electronic document conversion method according to any one of claims 1 to 10, wherein the two-dimensional pattern generation step includes a model acquisition step of acquiring a model of the printing apparatus. And a two-dimensional pattern that is a set of minute dots having a size corresponding to the model of the printing apparatus acquired in the model acquisition step.

  According to the electronic document conversion method of the present invention, a document for writing with a camera pen using infrared light as input light can be printed at low cost with a normal printing device without introducing a special printing device. become able to. It is also possible to provide an optimal two-dimensional pattern according to the type of printing apparatus to be used.

  Preferred embodiments of the present invention will be described below with reference to the drawings.

<Hardware configuration>
FIG. 1 is a diagram showing an example of a system configuration according to an embodiment of the present invention. A personal computer PC and a printing apparatus (image forming apparatus) P1 on a network N such as a LAN (Local Area Network) and a WAN (Wide Area Network). ~ P3 is connected.

  FIG. 2 is a diagram showing an example of the hardware configuration of the personal computer PC in FIG. 1, and an input device 101 such as a keyboard and a mouse, and a display device 102 such as an LCD (Liquid Crystal Display) and a CRT (Cathode Ray Tube). A drive device 103 that reads and writes the recording medium 104, an auxiliary storage device 105 such as a hard disk, a memory device 106 such as a ROM (Read Only Memory) and a RAM (Random Access Memory), and a CPU (Central Processing Unit). An arithmetic processing device 107 and an interface device 108 that interfaces with an external device are connected via a bus 109.

<First Embodiment>
FIG. 3 is a flowchart showing processing of the electronic document conversion method according to the first embodiment of the present invention, and FIGS. 4 to 6 are flowcharts showing detailed processing of each step in FIG. These processes are realized by the computer processor 107 executing a computer program loaded on the memory device 106 in the personal computer PC shown in FIGS. 1 and 2. The same applies to other embodiments.

  3, the electronic document conversion method according to the first embodiment includes a document conversion step S101 for converting a first electronic document into a second electronic document, and a two-dimensional characteristic unique to the converted second electronic document. A two-dimensional pattern generation step S102 for generating a pattern and a two-dimensional pattern superimposition step S103 for superimposing the generated two-dimensional pattern on the second electronic document are configured.

  The first electronic document input in the document conversion step S101 is a general document that can be displayed on a computer display, such as a text document, a spreadsheet, a graphic document, a presentation document, an image, and a web page. The second electronic document output in the document conversion step S101 is a document composed of a set of objects including text, graphics, images, etc., and metadata including color information, size, position, and the like. And For example, formats such as a Postscript document and a PDF (Portable Document Format) document can be used.

  FIG. 4 is a flowchart showing detailed processing of the document conversion step S101 in FIG. In FIG. 4, the document conversion step S101 includes a color information conversion step S201, a format conversion step S202, and an unprocessed object determination step S203.

  In the color information conversion step S201, the color information of each object of the input document is converted into a color material amount in a color space unique to the printing apparatus using a conversion formula or conversion table as shown in FIG. The amount of color material in a color space unique to a printing device is that a normal printing device uses four color materials of C (cyan), M (magenta), Y (yellow), and K (black). The color color material is CMY, and the color color material amount is the CMY toner amount, which determines the color density of the print document. At this time, color information is converted so that K is not used at all. A format conversion step S202 performs conversion from each format of the electronic document to an object of the electronic document having a predetermined format. In the unprocessed object determination step S203, it is determined whether or not there is an unprocessed object in order to repeat the above process for all the objects included in the electronic document.

  FIG. 5 is a flowchart showing detailed processing of the two-dimensional pattern generation step S102 in FIG. In FIG. 5, the two-dimensional pattern generation step S102 includes a unique ID acquisition step S301, a pattern generation method acquisition step S302, and a pattern generation step S303.

  The unique ID acquisition step S301 inquires the database and acquires a new ID (number) that is not used. FIG. 8 is a diagram illustrating an example of a database, which has a unique ID, an input document path, a structured electronic document path, a page, a structured electronic document generation date, and a generation time. The unique ID is set so that a unique ID is automatically assigned, and is assigned when a new record is generated. This ID has a data width of 3 bytes, for example.

  In the pattern generation method acquisition step S302, a preset pattern generation method (one of five types of black circle, black square, black straight line, period, and image) described later is acquired.

  In the pattern generation step S303, a two-dimensional pattern is generated based on the ID acquired from the database. The two-dimensional pattern includes micro dots in which the ID acquired from the database and the coordinates of the electronic document are encoded. As the two-dimensional pattern to be used and the generation procedure thereof, the method described in Patent Document 1 described above can be used.

  Hereinafter, a method for generating a two-dimensional pattern will be described in detail.

In the two-dimensional pattern, for example, black circles having a predetermined size are arranged at predetermined intervals, and each black circle is generated as one object. For example, as a description of a black circle by Postscript,
XYR AngleStart AngleEnd arc fill
It becomes. This means that an arc from the angle AngleStart to AngleEnd of radius R is drawn (arc) at the position (X, Y) on the page, and the inside is filled (fill). Of course, the color of this object is designated in advance in black and white binary black. In order to generate a circle, AngleStart = 0 and AngleEnd = 360.

In addition, a black square, a period (.) Of a character, etc. may be described so as to be printed at a predetermined size and position even if not a black circle. In the case of a black square, in Postscript,
XY moveto
0 L rlineto
L 0 rlineto
0 -L rlineto
closepath
fill
Write. This draws a line sequentially from the position (X, Y) on the page to (0, L), (L, 0), (0, -L), and closes the figure with closepath. That is, a square with one side L is drawn. And the command to fill the inside with fill.

It is also possible to draw a square by drawing a straight line. In this case,
L setlinewidth
XY moveto
L 0 rlineto
stroke
Write. The command is to set the line width to L, move to a position on the paper (X, Y), draw a relative line (L, 0) from there, and draw with stroke.

When drawing a period (.) Of characters,
/ Arial findfont
Rf scalefont
setfont
XY moveto
(.) show
Write. Specify the font Arial and set the font size to Rf. Then, the command moves to a position (X, Y) on the page and displays a period (.). In this case, the position of the period is not always displayed exactly at (X, Y), so the font is specified as described above, and α and β are corrected so that they are displayed accurately at the specified position. Are preferably added to X and Y, respectively.

  In addition, a black and white binary image may be used without arranging a large number of minute objects. In the case of a black-and-white binary image, for example, one dot black may be arranged at a predetermined position with a resolution of 600 dpi and A4 size.

  As described above, a plurality of methods have been described for representing minute dots. However, the plurality of methods are set so that they can be selected, and the execution time and various printing devices for converting an electronic document for each execution environment are set. An optimum method capable of printing the earliest in consideration of the time required for printing may be adopted.

  Next, FIG. 6 is a flowchart showing detailed processing of the two-dimensional pattern superimposing step S103 in FIG. In FIG. 6, the two-dimensional pattern superimposing step S103 includes a color information converting step S401, a format converting step S402, an unprocessed object determining step S403, and a pattern superimposing step S404.

  In the color information conversion step S401, the color information of the generated two-dimensional pattern is converted only to K (black) among the four color materials. The format conversion step S402 converts the generated two-dimensional pattern into a predetermined format. In the unprocessed object determination step S403, it is determined whether or not there is an unprocessed object in order to repeat the above process for all the objects included in the two-dimensional pattern. When the two-dimensional pattern is generated in advance in a predetermined format with only K as color information, the color information conversion step S401, the format conversion step S402, and the unprocessed object determination step S403 can be omitted. The pattern superimposing step S404 superimposes (inserts into the electronic document) the color information and the two-dimensional pattern after the format conversion on the already converted electronic document. If the two-dimensional pattern is an image, the white part should be made transparent and inserted into another electronic document.

  Thus, when the finally generated electronic document is printed by a printing apparatus (for example, a Postscript printer) that can understand the format of the electronic document, the two-dimensional pattern is printed in black that absorbs infrared light. Document objects other than the dimensional pattern are printed in a color that does not absorb infrared light. The paper document printed in this way is rewritten by a pen-type coordinate input device (camera pen), and a two-dimensional pattern is read at the time of rewriting.

  FIG. 9 is a diagram illustrating a configuration example of the pen-type coordinate input device 1, in which an image reading device 3 is provided in a cylindrical main body 2, and a writing tool 4 is provided from the distal end portion to the inside of the main body 2. A pressure sensor 5 for detecting writing pressure is provided at the other end. Further, the image reading apparatus 3 is equipped with an optical system 11 that passes only infrared light (equipped with an infrared transmission filter that absorbs visible light and transmits infrared light on the paper surface side of the optical system 11) and sensitivity to infrared light. A photoelectric conversion element 12 is provided, and an infrared light projector is provided as necessary. The main body 2 is provided with a microprocessor 6 that inputs and processes signals from the pressure sensor 5 and the photoelectric conversion element 12, and information on a two-dimensional pattern read in synchronization with writing is transmitted via an antenna 7. The information is transmitted wirelessly to an information processing apparatus (not shown). In addition, the main body 2 is provided with an LCD 8, an LED 9, and a buzzer 10 so as to notify the user of the operation state.

  FIG. 10 is a diagram illustrating an example of a read image. FIG. 10A shows an image when it is read with visible light for comparison, and characters of a document are captured in addition to a two-dimensional pattern indicated by a large number of small black dots. On the other hand, FIG. 10B shows an image according to the present invention, but the characters of the document do not appear in the image and only a two-dimensional pattern is captured. Therefore, it is possible to reliably read a two-dimensional pattern.

<Second Embodiment>
Next, FIG. 11 is a flowchart showing processing of the electronic document conversion method according to the second embodiment of the present invention, and FIGS. 12 to 14 are flowcharts showing detailed processing of each step in FIG. The second embodiment differs from the first embodiment described above in that the electronic document and the two-dimensional pattern are unified into an image.

  11, the electronic document conversion method according to the second embodiment includes a document conversion step S501 for converting an electronic document into an image document, and a two-dimensional pattern image for generating a two-dimensional pattern image unique to the converted image document. The generating step S502 and the two-dimensional pattern superimposing step S503 for superimposing the generated two-dimensional pattern image on the image document.

  The electronic document input in the document conversion step S501 is a general document that can be displayed on a computer display, such as a text document, a spreadsheet, a graphic document, a presentation document, an image, and a web page. The image document output in the document conversion step S501 is an image composed of so-called general pixel units, and has a resolution of, for example, 600 dpi or 1200 dpi. The image format used is, for example, a tiff format, an image having 4 color planes of 8 bits for each of CMYK.

  FIG. 12 is a flowchart showing detailed processing of the document conversion step S501 in FIG. In FIG. 12, the document conversion step S501 includes a color information conversion step S601, an object imaging step S602, and an unprocessed object determination step S603.

  In the color information conversion step S601, the color information of each object of the input document is converted into a color material amount in a color space unique to the printing apparatus using a conversion formula or conversion table as shown in FIG. . An object imaging step S602 converts each object of an electronic document into an image. In the unprocessed object determination step S603, it is determined whether or not there is an unprocessed object in order to repeat the above process for all the objects included in the electronic document.

  FIG. 13 is a flowchart showing detailed processing of the two-dimensional pattern image generation step S502 in FIG. In FIG. 13, the two-dimensional pattern image generation step S502 includes a unique ID acquisition step S701 and a pattern generation step S702.

  The unique ID acquisition step S701 inquires the database and acquires a new ID (number) that is not used. The pattern generation step S702 generates a two-dimensional pattern based on the ID acquired from the database. The two-dimensional pattern includes micro dots in which the ID acquired from the database and the coordinates of the image document are encoded. As the two-dimensional pattern to be used and the generation procedure thereof, the method described in Patent Document 1 described above can be used.

  The two-dimensional pattern matches a different image document on which the pattern is superimposed. For example, a black pixel having a size of 1 pixel is predetermined in an image having a resolution of 600 dpi, a horizontal pixel count of 4960, a vertical pixel count of 7015, and a monochrome 1-bit image. Are arranged at intervals of. If the resolution of the other image document is 1200 dpi, the two-dimensional pattern has a resolution of 1200 dpi, a horizontal pixel count of 9,920, a vertical pixel count of 14030, and black and white pixels of 2 × 2 pixels in a monochrome 1-bit image. Arranged at intervals.

  FIG. 14 is a flowchart showing detailed processing of the two-dimensional pattern superimposing step S503 in FIG. In FIG. 14, the two-dimensional pattern superimposing step S503 includes a color information converting step S801 and a pattern superimposing step S802.

  In color information conversion step S801, a two-dimensional pattern image, which is a binary image, is converted into a grayscale image, and white is set to 0 and black is set to 255. Note that when the two-dimensional pattern image is generated in advance as a grayscale image, the color information conversion step S801 can be omitted. Then, in the pattern superimposing step S802, the two-dimensional pattern image converted into the gray scale image is superimposed on the K plane (region having black information) of the already converted image document. In the already converted image document, all the pixels of the K plane have a value of 0, and when the pixel value of the two-dimensional pattern image is 255, the pixel value of the K plane of the other image document is changed to 255.

  As a result, when an image document having a finally generated CMYK plane is printed by a printing apparatus (for example, a postscript printer) that can output the value of the CMYK plane as it is, the two-dimensional pattern absorbs infrared light. The object other than the two-dimensional pattern is printed in a color that does not absorb infrared light.

<Third Embodiment>
Next, FIG. 15 is a flowchart showing the processing of the two-dimensional pattern generation step in the electronic document conversion method according to the third embodiment of the present invention. In consideration of the fact that there is a performance difference between printing apparatuses regarding the printing capability of the minute dots constituting the two-dimensional pattern, the third embodiment does not depend on the printing apparatus, and the two-dimensional pattern is optimized in a state without blurring or missing. It can be printed. That is, when printing fine dots, the model information of the printing apparatus used for printing is acquired, and the optimum print resolution and fine dot size are determined for fine dot printing.

  In FIG. 15, the two-dimensional pattern generation step according to the third embodiment includes a unique ID acquisition step S901, a printer information acquisition step S902, a pattern generation method acquisition step S903, and a pattern generation step S904. As processing before and after the two-dimensional pattern generation step, the same processing as the document conversion step S101 and the two-dimensional pattern superimposition step S103 shown in FIG. 3 is performed.

  In the unique ID acquisition step S901, the database is inquired and a new ID (number) that is not used is acquired. In printer information acquisition step S902, the model name of the printing apparatus used for printing is directly acquired from the properties relating to the printer model in the printer driver or the printing apparatus actually used. Depending on the model name, the optimum printing resolution and the size of the minute dots are determined. FIG. 16 is a diagram showing an example of the relationship between the printer model and the optimum dot size and print resolution of the two-dimensional pattern. The optimum combination of black dot size (R, L, Rf) and resolution depending on the printer model. An example is shown. When printing minute dots represented by an object, the resolution indicates the printing resolution of the printing apparatus and is set by PDL (Printer Description Language). Further, the resolution when a minute dot is represented by a monochrome binary image means both the image resolution and the printing resolution of the printing apparatus. By holding these pieces of information in advance, the optimum printing resolution and the size of the minute dots are required for printing the minute dots from the printer model.

  Next, in the pattern generation method acquisition step S903, the pattern generation method (black circle, black square, black straight line, period, image Acquire one of five types). Then, the pattern generation step S904 generates a two-dimensional pattern based on the determined pattern generation method.

  As described above, since the electronic document is converted by software processing separately from the printing apparatus, a document for writing with a camera pen using infrared light as input light is not required without introducing a special printing apparatus. It becomes possible to print at low cost with a printing apparatus. It is also possible to provide an optimal two-dimensional pattern according to the type of printing apparatus to be used.

  The present invention has been described above by the preferred embodiments of the present invention. While the invention has been described with reference to specific embodiments, various modifications and changes may be made to the embodiments without departing from the broad spirit and scope of the invention as defined in the claims. Obviously you can. In other words, the present invention should not be construed as being limited by the details of the specific examples and the accompanying drawings.

It is a figure which shows the example of the system configuration | structure in embodiment of this invention. It is a figure which shows the example of the hardware constitutions of a personal computer. It is a flowchart which shows the process of the electronic document conversion method concerning the 1st Embodiment of this invention. It is a flowchart which shows the detailed process of the document conversion step in FIG. It is a flowchart which shows the detailed process of the two-dimensional pattern generation step in FIG. It is a flowchart which shows the detailed process of the two-dimensional pattern superimposition step in FIG. It is a figure which shows the example of color information conversion. It is a figure which shows the example of a database. It is a figure which shows the structural example of a pen-type coordinate input device. It is a figure which shows the example of a reading image. It is a flowchart which shows the process of the electronic document conversion method concerning the 2nd Embodiment of this invention. It is a flowchart which shows the detailed process of the document conversion step in FIG. It is a flowchart which shows the detailed process of the two-dimensional pattern image generation step in FIG. It is a flowchart which shows the detailed process of the two-dimensional pattern superimposition step in FIG. It is a flowchart which shows the process of the two-dimensional pattern production | generation step in the electronic document conversion method concerning the 3rd Embodiment of this invention. It is a figure which shows the example of the relationship between a printer model, the optimal dot size of a two-dimensional pattern, and printing resolution.

Explanation of symbols

PC personal computer N network P1 to P3 printing apparatus S101 document conversion step S102 two-dimensional pattern generation step S103 two-dimensional pattern superposition step S201 color information conversion step S202 format conversion step S203 unprocessed object determination step S301 unique ID acquisition step S302 pattern generation method Acquisition step S303 Pattern generation step S401 Color information conversion step S402 Format conversion step S403 Unprocessed object determination step S404 Pattern superimposition step S501 Document conversion step S502 Two-dimensional pattern image generation step S503 Two-dimensional pattern superposition step S601 Color information conversion step S602 Object image Step S603 Unprocessed object Judgment step S701 Unique ID acquisition step S702 Pattern generation step S801 Color information conversion step S802 Pattern superimposition step S901 Unique ID acquisition step S902 Printer information acquisition step S903 Pattern generation method acquisition step S904 Pattern generation step

Claims (11)

Converting the color of all the elements included in the first electronic document into a color material amount of the printing apparatus and converting the first electronic document into a second electronic document having a predetermined format;
Generating a two-dimensional pattern unique to the second electronic document;
Converting the two-dimensional pattern into a black material amount of a printing apparatus, and superimposing the amount on the second electronic document. The electronic document conversion method according to claim 1,
The step of generating the two-dimensional pattern includes:
Issuing a unique ID for the second electronic document;
An electronic document conversion method comprising: generating a two-dimensional pattern in which the ID is encoded two-dimensionally. The electronic document conversion method according to claim 1,
The step of generating the two-dimensional pattern includes:
Issuing a unique ID for the second electronic document;
An electronic document conversion method comprising: two-dimensionally arranging minute two-dimensional pattern units in which the ID and the coordinates of the second electronic document are encoded two-dimensionally. The electronic document conversion method according to any one of claims 1 to 3,
An electronic document conversion method characterized in that an element constituting the two-dimensional pattern is a minute dot. Converting the color of all the elements included in the electronic document into the color color material amount of the printing apparatus and converting the electronic document into an image document;
Generating a two-dimensional pattern image unique to the image document;
Converting the color of the two-dimensional pattern image into a black material amount of a printing apparatus and superimposing the color on the image document. The electronic document conversion method according to claim 5,
The step of generating the two-dimensional pattern image includes
Issuing a unique ID for the image document;
And a step of generating a two-dimensional pattern image in which the ID is encoded two-dimensionally. The electronic document conversion method according to claim 5,
The step of generating the two-dimensional pattern image includes
Issuing a unique ID for the image document;
An electronic document conversion method comprising: two-dimensionally arranging a minute two-dimensional pattern unit in which the ID and the coordinates of the image document are encoded two-dimensionally. The electronic document conversion method according to any one of claims 5 to 7,
An electronic document conversion method, wherein an element constituting the two-dimensional pattern image is a minute dot. The electronic document conversion method according to any one of claims 4 and 8,
2. The electronic document conversion method according to claim 1, wherein the minute dots are any one of a black circle object, a black square object, a black straight line object, and a character period. The electronic document conversion method according to any one of claims 1 and 5,
The electronic document conversion method, wherein the two-dimensional pattern and the two-dimensional pattern image are black and white binary images having a plurality of minute dots. In the electronic document conversion method according to any one of claims 1 to 10,
The two-dimensional pattern generation step includes
An electronic apparatus comprising a model acquisition step for acquiring a model of a printing apparatus, and generating a two-dimensional pattern that is a set of minute dots having a size corresponding to the model of the printing apparatus acquired in the model acquisition step Document conversion method.