JP2018176687A - Printing apparatus and printing system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform printing without leaking the content of an encoded document even in a case where a device for generating the encoded document and a device for decoding are installed in places physically and electrically apart from each other.SOLUTION: A determination unit 102 determines whether or not images of a plurality of pieces of encoded document data match each other and the brightness is equal to or greater than a prescribed threshold when there are the plurality of pieces of encoded document data. A printing control unit 103 performs printing based on the document image obtained by decoding the plurality of pieces of encoded document data by a decoding unit 101 when it is determined that the images of the plurality of pieces of encoded document data do not match each other or the brightness is less than the threshold. On the other hand, the printing control unit 103 prohibits printing based on the encoded document data which is determined that the images of the plurality of pieces of encoded document data match each other and the brightness is equal to or greater than the threshold after performing printing based on the document image decoded by the decoding unit 101 when it is determined that the images of the plurality of pieces of encoded document data match each other and the brightness is less than the threshold.SELECTED DRAWING: Figure 2

Description

  The present invention is a printing apparatus that performs printing without leaking the contents of the encoded document even when the apparatus for generating the encoded document and the apparatus for decoding are installed at locations separated physically and electrically. And the printing system.

  In recent years, in an office, a plurality of computers and an image forming apparatus are connected via a network, and the image forming apparatus is often shared among the plurality of computers.

  However, from the viewpoint of security, the computer and the printing apparatus may be installed and operated in different rooms without intentionally connecting the computer and the printing apparatus via a network.

  When such a computer and a printing apparatus are installed in different rooms, a printing apparatus for printing a small amount of printing devices connected to the computer is used to print an original, and a user can print a large amount of printed originals. It is possible to obtain a large amount of printed matter by bringing in the room installed and copying the manuscript.

  However, if the manuscript is highly confidential, for example, a school exam question and its answer, there is a risk that it may be lost if the user brings in a readable manuscript to a room where the image forming apparatus is installed. There was a security problem.

  Therefore, in order to prevent leakage of the contents of the manuscript, it is preferable to carry it to the place where the printing apparatus is installed, after making it impossible for the third party to read the manuscript by coding all the manuscript. . For example, an encoding printing apparatus for small amount printing that can print based on encoded image data is connected to a computer, and the encoding printing apparatus is encoded based on the encoded image data encoded by the computer. An encoded original is obtained by printing the image encoded on the sheet. The user then causes the printing apparatus for mass printing, which is installed in a room different from the computer and capable of reading and combining encoded documents, installed in a room different from the computer, and reads the encoded documents. By decoding, a large amount of decoded printed matter is obtained.

  Here, in Patent Document 1, when it is detected that additional information is added to the document separately from the image, the additional information analysis unit analyzes the content of the additional information, and the CPU analyzes the content based on the content analysis result. There is disclosed a technique relating to an image reading apparatus which determines whether the image reading in the document is performed on both sides of the document or only on one side of the document.

Unexamined-Japanese-Patent No. 2007-88986

  However, since the technique of Patent Document 1 targets a document to which the additional information 51 is added separately from the image, it is not assumed to encode the entire image data of the document. For example, if the teacher creates the exam questions and their answers in the school, the exam questions and their answers are all encoded so that the exam questions and answers are not leaked, and the contents can not be understood just by looking at them. Therefore, it is preferable to carry it to the place where the printing apparatus is installed, but the technique of Patent Document 1 only adds information used for the determination of both sides and one side as the additional information 51 separately from the image. Could leak.

  Also, even if all of the test questions and their answers are encoded and printed, if the encoded encoded document is lost, a third party uses this encoded document to print a printer having a complex function. There is a problem of information leakage because a read-out and a read-out and a read-out encoded document can be decoded to obtain a decoded printed material.

  The present invention has been made in view of the above, and a device for generating a coded document and a device for decoding are physically separated from each other without leaking the content of the coded document. An object of the present invention is to provide a printing apparatus and a printing system capable of printing.

In order to achieve the above object, a first feature of the printing apparatus according to the present invention is
An original reading unit that reads an encoded original on which the encoded image is printed and generates encoded original data;
A decoding unit that decodes the encoded document data;
A determination unit that determines whether the images of the plurality of encoded document data match and the lightness is equal to or greater than a predetermined threshold when there is a plurality of encoded document data generated by the document reading unit;
When it is determined by the determination unit that the images of the plurality of encoded document data do not match or the lightness is less than a threshold, the plurality of pieces of encoded document data are decoded based on the document images decoded by the decoding unit. While printing,
After printing based on the document image decoded by the decoding unit, the determination unit determines that the images of the plurality of coded document data match and the lightness is determined to be equal to or more than the threshold value. And printing control means for prohibiting printing.

The first feature of the printing system according to the present invention is
A computer for generating an encoded image from an original image, and double-sided printing based on an original image including a front image and a reverse image generated by reading and decoding the encoded image from the encoded original printed based on the encoded image A printing system having a printing device
The computer is
Relationship determining means for determining whether or not there is a relationship between the front image and the back image of the document image based on the set relationship information;
If the interrelation determining means determines that there is an interrelation, if the number of pages of the encoded front image and the encoded back image encoded respectively on the basis of the front image and the back image of the original image is different, the same page And inserting an empty page into a smaller number so as to be a number, and encoding means for generating an encoded image;
The printing device is
Document reading means for reading an encoded document on which the encoded image has been printed and generating encoded document data;
A decoding unit that deletes the blank page and decodes the encoded document data when there is a blank page in the encoded document data generated by the document reading unit;
A determination unit that determines whether the images of the plurality of encoded document data match and the lightness is equal to or greater than a predetermined threshold when there is a plurality of encoded document data generated by the document reading unit;
When it is determined by the determination unit that the images of the plurality of encoded document data do not match or the lightness is less than a threshold, the plurality of pieces of encoded document data are decoded based on the document images decoded by the decoding unit. While printing,
After printing based on the document image decoded by the decoding unit, the determination unit determines that the images of the plurality of coded document data match and the lightness is determined to be equal to or more than the threshold value. And printing control means for prohibiting printing.

According to the first feature of the printing apparatus in accordance with the present invention, when the determination means determines that the images of the plurality of encoded document data do not match or the lightness is less than the threshold, the decoding means While printing is performed based on the original image obtained by decoding the original document data,
After printing based on the document image decoded by the decoding unit, the determination unit prohibits printing based on the coded document data for which the images of the plurality of coded document data match and the lightness is determined to be equal to or greater than the threshold. .

  Therefore, if the images of the plurality of encoded document data do not match or are less than the threshold value, that is, the plurality of encoded document data prohibited document data is not included, the user wants to decode and print all of them. Since it can be inferred that it is desired, the plurality of encoded original data are decoded and printed. On the other hand, the images of the plurality of encoded document data match and are equal to or more than the threshold. That is, when prohibited document data is included among a plurality of encoded document data, it can be inferred that it is desirable to prohibit printing after printing, so prohibited document data and this prohibited document data are included. Printing based on corresponding encoded document data can be prohibited.

  Thereby, even when the apparatus for generating the coded document based on the coded image and the printing apparatus to be decoded are installed at a place physically and electrically separated, the content of the coded document is leaked. Printing can be performed.

BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing which shows schematic structure of the printing system which has a stencil printing machine which is a printing apparatus which concerns on this Embodiment 1 of this invention. FIG. 6 is an explanatory view schematically illustrating an operation of a CPU provided in the stencil printing apparatus according to the first embodiment of the present invention. It is the flowchart which showed the processing content of the stencil printing apparatus which concerns on this Embodiment 1 of this invention. It is explanatory drawing which showed typically operation | movement in the information terminal device of the printing system which concerns on this Embodiment 2 of this invention. It is the flowchart which showed the processing content of the information terminal device with which the printing system concerning this embodiment 2 of the present invention is provided. It is the flowchart which showed the processing content of the stencil printing apparatus which concerns on this Embodiment 2 of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The same or equivalent parts or components are denoted by the same or equivalent reference numerals throughout the drawings. However, it should be noted that the drawings are schematic and different from real ones. Moreover, it is a matter of course that parts having different dimensional relationships and ratios among the drawings are included.

  Further, the embodiment shown below is an example of an apparatus etc. for embodying the technical idea of the present invention, and the technical idea of the present invention includes the material, shape, structure, and the like of each component. The arrangement etc. are not specified to the following. Various changes can be added to the technical idea of the present invention within the scope of the claims.

First Embodiment
The first embodiment of a printing system having a stencil printing apparatus which is a printing apparatus according to the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is an explanatory view showing a schematic configuration of a printing system having a stencil printing apparatus which is a printing apparatus according to the first embodiment of the present invention.

(Whole configuration of printing system)
As shown in FIG. 1, the printing system of the present embodiment includes an information terminal device 1, an inkjet printing device 5, and a stencil printing device 9. The information terminal device 1 and the inkjet printing device 5 are installed in a data generation room, and the stencil printing device 9 is installed in a printing room physically separated from the data generation room. Each unit is connected to each device indoors, but is not connected across rooms. That is, although the information terminal device 1 and the inkjet printing device 5 are connected to be able to transfer data by a printer cable or the like, the information terminal device 1 and the stencil printing device 9 are physically and electrically connected by a printer cable, a network cable, etc. Not connected.

  In such a configuration, the user causes the information terminal device 1 installed in the data generation room to generate encoded image data in which all of the original image is encoded, so that the contents of the original image are not leaked. Based on the encoded image data, the stencil printing apparatus 9 prints the encoded image on a sheet to obtain an encoded document. The user can obtain the printed matter decoded by causing the stencil printing apparatus 9 installed in the printing room to read the encoded document and decoding the read encoded document.

  The information terminal device 1 is configured by a general-purpose computer such as a PC (personal computer). The information terminal device 1 includes a CPU 16 that executes various processes based on a control program. Further, the CPU 16 is connected to a RAM 18 functioning as a working area, a ROM 17 storing data, and the like, and connected to various devices via various interfaces. Specifically, the CPU 16 is an input unit 19 configured of a keyboard, a mouse, etc., various types of interfaces, an output unit 20 configured of a liquid crystal display etc., an external storage device 21 such as a large capacity storage device A disk drive 22 or the like is connected which reads data recorded in the recording medium 50 and writes predetermined data in the disk recording medium 50.

  In the external storage device 21, a storage area of an application program for generating a document image including a printed image such as a document or an image, a storage area of a printer driver program of the ink jet printing apparatus 5 and a storage area of other various application programs are secured. It is done. The external storage device 21 also secures a document image generated using an application program, a coded image obtained by coding the document image, and a database area for storing print setting information. . Here, the print setting information is information necessary for normal printing, such as the print mode, the size and resolution of the encoded image, the size of the print sheet, and the print direction.

  The CPU 16 is an arithmetic device configured by a processor, a memory and other peripheral devices, and activates an application program of the external storage device 21 in accordance with the activation request input from the input unit 19. Further, the CPU 16 generates, on the activated application program, a document image indicating an image instructed by parameter input from the input unit 19 or the like. The generated document image is displayed and output in the output unit 20, and is stored in the database area of the external storage device 21 when the storage request is input from the input unit 19.

  The document image stored in the database area of the external storage device 21 is read out from the external storage device 21 when a read request from the input unit 19 is input during activation of the application program. Based on the read original image, it can be displayed and output to the output unit 20. Further, it can be processed on the application program and regenerated into a new original image.

  Then, when a request for encoding and printing a document image generated by a document application program or the like is input, the CPU 16 executes the printer driver program on the CPU 16 to virtually construct the printer driver 11 on the CPU. Here, the encoding print request is a printing mode for printing an image encoded on a sheet, and based on a document image desired to be printed, an encoded image for printing and inhibiting printing. This is a mode for printing (prohibited document image). The user selects this encoded printing when high security printing is desired so that the third party can not determine the content of the highly confidential original image and the third party can not print the document image. Do.

  The printer driver 11 is a data conversion program executed on the information terminal device 1 in order to control the inkjet printing device 5 connected to the information terminal device 1. The printer driver 11 acquires a document image having a print image generated by a document application or the like, and encodes the document image to generate a coded image, when the user performs an operation for requesting coding and printing. . For example, the printer driver 11 divides an original image into predetermined areas, and generates an encoded image by encoding each of the divided areas into a two-dimensional code, a three-dimensional code, or the like.

  At this time, since encoded printing is requested, the printer driver 11 generates two encoded images based on the original image so that they are the same image and the lightness is equal to or more than a predetermined threshold. . For example, while generating an encoded image so as to print in "black" based on an original image, and print in "red" that has a sufficient brightness difference with "black" based on the same original image To generate an encoded image (prohibited original image).

  Then, the printer driver 11 causes the inkjet printing device 5 to print based on the encoded image for printing in “black” and the encoded image for printing in “red” by the ink jet printing device 5, “black And the encoded original printed in “red”.

  The inkjet printing apparatus 5 includes a plurality of ink heads in which a large number of nozzles are formed, and discharges black or color ink from each ink head to the supplied paper so that a plurality of images overlap each other on the paper An ink jet color printer that forms an image on a sheet of paper and forms an image on the sheet.

  In addition, the inkjet printing apparatus 5 can generate an encoded document whose content can not be determined only by the user's viewing, by printing on a sheet based on the encoded image generated by the information terminal device 1.

  The stencil printing apparatus 9 feeds a sheet to the rotating drum after winding the master, which has been subjected to plate making, onto the drum, and performs printing by pressing the supplied sheet against the drum with a press roll while rotating the drum. It is a stencil type printer.

  In the present embodiment, the stencil printing apparatus 9 reads a coded document on which the coded image is printed and outputs a coded document data, and an operation for processing functions executed by the stencil printing apparatus 9. A print image is displayed on a sheet (single-sided or double-sided) based on an original image obtained by decoding information and displaying user information including a command related to a printing operation, and an encoded original data output from the scanner unit 98. A printer unit 96 for printing (recording) and a control unit 90 for controlling the entire information device are provided. A sheet used for printing a print image in the printer unit 96 is conveyed from a paper feed unit (not shown) to a paper discharge unit (not shown) via the printer unit 96 or an external device.

  The control unit 90 of the stencil printing apparatus 9 decodes the encoded document data read by the scanner unit 98 to generate a document image, and the printer unit 96 executes printing of the document image on a sheet under designated conditions. Do.

  Further, the control unit 90 is connected to an operation panel 97 including an operation screen and a touch panel covering the operation screen. The operation panel 97 is disposed on the top of the stencil printing apparatus 9. The operation panel 97 can use setting conditions such as the number of printed sheets when copying and printing an original set in the scanner unit 98 as an input operation unit or the like input by the user. The operation panel 97 displays a screen for inputting user authentication information (ID and password) for authenticating the operating user, and can also be used as an authentication receiving unit for receiving the user authentication information.

  The control unit 90 of the stencil printing apparatus 9 that causes the printer unit 96 to perform the printing operation includes a CPU 95. The CPU 95 is an arithmetic processing configured by a processor such as a CPU or DSP (Digital Signal Processor), a memory, hardware such as another electronic circuit, software such as a program having a function thereof, or a combination thereof. It is an apparatus. The CPU 95 virtually constructs various functional modules by appropriately reading and executing a program, and performs processing related to image data, operation control of each part, and various processing for user operation. Further, the CPU 95 controls the operation of the scanner unit 98 and the printer unit 96 according to the contents input and set from the operation panel 97 based on the program and setting information stored in the ROM 91.

  Note that the control unit 90 is provided with a RAM 92, and the RAM 92 temporarily stores encoded document data read by the scanner unit 98 and a decoded document image to the printer unit 96. Are stored.

  Further, the control unit 90 is provided with an external storage device 93, and the external storage device 93 is connected to the CPU 95. The external storage device 93 is provided with a plurality of areas for storing the document image and setting information transferred from the above-described RAM 92.

  The CPU 95 of the control unit 90 is functionally provided with a decoding unit 101, a determination unit 102, and a print control unit 103. The “module” used in the present embodiment is configured by hardware such as an apparatus or a device, software having the function, or a combination thereof, and is a functional unit for achieving a predetermined operation. Indicates

  FIG. 2 is an explanatory view schematically illustrating the operation of the CPU 95 provided in the stencil printing apparatus according to the first embodiment of the present invention.

  As shown in FIG. 2, the user carries the encoded originals D1 and D2 printed on the basis of the encoded image by the ink jet printing apparatus 5 into the printing room, and encodes the encoded original D1 and D2 into the stencil printing apparatus 9 installed in the printing room. When printing is instructed, the scanner unit 98 of the stencil printer 9 reads the encoded original from the encoded originals D1 and D2 and generates encoded original data P1 and P2.

  When there is a plurality of encoded document data generated by scanner unit 98 (here, there are two encoded document data of encoded document data P1 and P2), determination unit 102 determines a plurality of encoded document data P1. , P2 match, and it is determined whether the lightness is equal to or greater than a predetermined threshold. When the images match for a plurality of encoded document data P1 and P2 and the lightness is equal to or more than a predetermined threshold, the encoded document data P2 supplied later is printed based on the encoded document data P1. It is determined that the encoded document data corresponding to the prohibited document image to be prohibited, that is, the prohibited document data. On the other hand, when the images do not match or the lightness is less than the predetermined threshold value for the plurality of encoded document data P1 and P2, the encoded document data P2 supplied later is also the same as the encoded document data P1. It is determined that the data is encoded document data that the user desires to print.

  The decoding unit 101 decodes, of the encoded document data read by the scanner unit 98, encoded document data that is not prohibited document data, and generates a document image. Here, since the encoded document data P1 is not prohibited document data and the encoded document data P2 is prohibited document data, the decoding unit 101 decodes the encoded document data P1 to generate a document image Q1. Note that the decoding unit 101 may generate the document image by decoding the coded document data regardless of whether the document data is prohibited document data.

  When the determination unit 102 determines that the images of the plurality of encoded document data do not match or are less than the threshold value, the print control unit 103 detects the document image in which the plurality of encoded document data is decoded by the decoding unit 101 Print based on. As a result, when the plurality of encoded document data does not include the prohibited document data, it can be inferred that the user wants to print based on the plurality of pages of encoded document data, so the decoding unit 101 Printing is performed based on the original image obtained by decoding the original document data.

  On the other hand, if the determination unit 102 determines that the images of the plurality of pieces of encoded document data match and are less than the threshold, the print control unit 103 prints based on the document image decoded by the decoding unit 101. After that, the determination unit 102 prohibits printing based on the encoded document data determined to have the images of the plurality of encoded document data match and to be equal to or greater than the threshold value. Here, with regard to the encoded document data P1 and P2, assuming that the images match and the lightness is equal to or greater than the predetermined threshold value, the encoded document data P2 supplied later is printed based on the encoded document data P1. It means encoded document data to be prohibited, that is, prohibited document data. Therefore, the print control unit 103 controls the printer unit 96 to print based on the document image Q1 in which the coded document data P1 is decoded by the decoding unit 101 and obtains the printed material R1, while the coded document data P2 is Since the document data is prohibited document data, the print control unit 103 thereafter prohibits printing based on the document image Q1 obtained by decoding the coded document data P1. Thus, after printing based on the document image Q1, printing is not performed again. For example, the user forgets to place the coded document D1 somewhere, and a third party uses the coded document D1. Even when the stencil printing device 9 is to print, since printing based on the coded document data P1 is already prohibited, printing can not be performed using the coded document D1.

  Therefore, the third party can not grasp the contents even when looking at the encoded document D1, and can not decode the encoded document D1. As a result, the inkjet printing device 5 for generating the encoded document and the stencil printing device 9 to be decoded are disposed at a physically separated position, and the user carries the encoded document printed by the inkjet printing device 5. Even when the user sets the encoded original in the stencil printing apparatus 9 to perform decoding and printing, printing can be performed with the contents of the original prevented from leaking.

(Function of stencil printing machine)
Next, the operation of the stencil printing apparatus 9 according to the first embodiment of the present invention will be described.

  FIG. 3 is a flowchart showing the processing contents of the stencil printing apparatus 9 according to the first embodiment of the present invention.

  As shown in FIG. 3, when coded printing is designated by a user operation (step S101; YES), the CPU 95 determines whether single-sided printing is designated or double-sided printing is designated (step S103).

  When single-sided printing is designated (step S103; YES), the scanner unit 98 reads the surface of the first coded document on which the coded image is printed, and outputs the coded document data (step S105).

  The decoding unit 101 decodes the encoded document data output from the scanner unit 98 to generate a document image (step S107), and the print control unit 103 prints on the printer unit 96 based on the generated document image. (Step S109).

  Next, when the next encoded document is read by the scanner unit 98 (step S111; YES), the CPU 95 reads a plurality of encoded document data together with the encoded document data read in step S105. Thus, the determination unit 102 determines whether the images of the plurality of pieces of encoded document data match (step S113).

  If it is determined that the images of the plurality of encoded document data match (step S113; YES), the determination unit 102 then determines whether the lightness is equal to or greater than a predetermined threshold (step S115).

  If it is determined that the lightness is equal to or higher than the predetermined threshold (step S115; YES), the print control unit 103 performs printing based on the encoded document data read in step S105 and the encoded document data read in step S111. Is prohibited (step S117).

  On the other hand, when it is determined that the images of the plurality of encoded document data do not match (step S113; NO), or when it is determined that the lightness is less than the predetermined threshold (step S115; NO), reading in step S111 It can be inferred that the encoded document data obtained is data having a content different from that of the encoded document data read in step S105.

  Therefore, the decoding unit 101 decodes the encoded document data read in step S111 to generate a document image (step S119), and the print control unit 103 causes the printer unit 96 to generate a document image based on the generated document image. Printing is performed (step S121).

  On the other hand, when double-sided printing is designated (step S103; NO), the scanner unit 98 reads both sides of the first encoded document on which the encoded image is printed, and encodes the original data of the front and back sides. It outputs (step S131).

  As a result, a plurality of encoded document data are generated, and the determination unit 102 determines whether the images of the plurality of encoded document data match (step S131).

  If it is determined that the images of the plurality of pieces of encoded document data match (step S133; YES), next, the determination unit 102 determines whether the lightness is equal to or more than a predetermined threshold (step S135).

  When it is determined that the lightness is equal to or more than the predetermined threshold (step S135; YES), the decoding unit 101 decodes the front side encoded document data to generate a document image (step S137), and the print control unit 103 generates The printer unit 96 is made to print based on the original image on the front side (step S139).

  Then, the print control unit 103 prohibits printing based on the encoded document data on the front and back sides (step S117).

  As described above, according to the stencil printing apparatus 9 according to the first embodiment of the present invention, the decoding unit 101 decodes the encoded document data read by the scanner unit 98 to generate a document image, and the determination unit 102 However, if there is a plurality of encoded document data generated by the scanner unit 98, it is determined whether the images of the plurality of encoded document data match and the lightness is equal to or greater than a predetermined threshold, and the print control unit 103 If it is determined by the determination unit 102 that the images of the plurality of encoded document data do not match or are less than the threshold, printing is performed based on the document image obtained by decoding the plurality of encoded document data by the decoding unit 101 On the other hand, when the determination unit 102 determines that the images of the plurality of pieces of encoded document data match and are less than the threshold, the print control unit 103 determines that the document image decoded by the decoding unit 101 After printing on the basis of the determination unit 102 by image of a plurality of coded document data matches, and prohibits printing based on the determined encoded original data with a threshold value or more.

  Therefore, in the case where prohibited document data is not included among the plurality of encoded document data, it can be inferred that the user desires to decode and print any data, and therefore, the plurality of encoded document data is If it is judged that printing is performed and printing is prohibited among the plurality of encoded document data, it can be inferred that printing is desired to be prohibited after printing. Printing based on encoded document data corresponding to the prohibited document data can be prohibited.

  As a result, even when the inkjet printing apparatus 5 for generating the encoded document and the stencil printing apparatus 9 to be decoded are placed at physically separated places, the content of the encoded document is prevented from leaking. It can print.

  In the first embodiment of the present invention, after printing based on the document image decoded by the decoding unit 101, the print control unit 103 matches the images of the plurality of coded document data by the determination unit 102, and Although printing based on encoded document data determined to be equal to or greater than the threshold is prohibited, as a method of prohibition, encoded document data in which the images of a plurality of encoded document data match by the determination unit 102 and determined to be equal to or more than the threshold The document image obtained by decoding may be deleted, or the document image obtained by decoding the encoded document data may be stored in the external storage device 93 as being unreadable. Also, the ID and the password are associated with each other in the external storage device 93 and stored as a print-prohibited document image, and the user calls the document image from the operation panel 97 and the input password matches the stored password. And the printing prohibition may be released.

Second Embodiment
In the second embodiment of the present invention, when it is determined that the front surface and the back surface of the document image are mutually related, the number of pages of the coded surface image and the coded back image encoded based on the front image and the back image, respectively. In the case of a difference, a blank page is inserted to the smaller number so as to obtain the same page number, and a printing system including the information terminal device 1 that generates a coded image will be described as an example. The configuration of the printing system according to the second embodiment of the present invention is the same as the configuration of the printing system according to the first embodiment of the present invention shown in FIG.

  FIG. 4 is an explanatory view schematically showing an operation in the information terminal device 1 of the printing system according to the second embodiment of the present invention. Here, the case where the front side original image C1 which is a test question is printed on the front side of the sheet and the back side original image C2 which is the answer of the test question is printed on the back side of the sheet will be described as an example.

  As shown in FIG. 4, when the front original image C1 which is the test question is printed on the front side of the sheet and the back original image C2 which is the answer of the test question is printed on the back side of the sheet, the reverse original image C2 is There are cases where the number of characters is large and the amount of data is larger than the front side original image C1.

  In such a case, when the CPU 16 of the information terminal device 1 encodes the front side original image C1 and the back side original image C2, the encoded original image D3 in which the front side original image C1 is encoded fits within one page. However, as in the case of the encoded original images D5 and D6 in which the back side original image C2 is encoded, the data amount may not be limited to one page but may be two pages.

  When the inkjet printing apparatus 5 prints based on the encoded document image D3 and the encoded document images D5 and D6, the user can not read the document only by looking at the encoded document, and thus confusion of the user is caused. Could have caused it.

  Therefore, in the printing system according to the second embodiment of the present invention, when the information terminal device 1 determines that there is a mutual relationship between the front and back sides of the document image, it is encoded based on the front side and back side images. If the number of pages of the coded front image and the coded back image is different, blank pages are inserted into the smaller number so as to obtain the same number of pages, and a coded image is generated.

  Specifically, the CPU 16 of the information terminal device 1 functions as a document image relation determination unit and an encoding unit, and executes each process.

  The CPU 16 functions as an original image mutual relation determination unit, and determines whether or not there is a mutual relation between the front side original image and the rear side original image of the original image data on the basis of preset mutual relation information. Here, with the interrelation information, the front side original image and the back side original image are automatically designated by the application program, and information that the front side and the back side are interrelated is set in advance as the interrelation information. For example, when the front side original image is set as a test question and the back side original image is set as an answer to the test question, or when the front side original image is set as a test question and the back side original image is set as a prohibited original image The mutual relation information is set as the mutual relation between the front and back surfaces. Then, the CPU 16 determines whether or not there is a mutual relationship based on the mutual relationship information.

  Further, the CPU 16 functions as an encoding unit, and when it is determined that there is a mutual relationship, the number of pages of the encoded front image and the encoded back image which are respectively encoded based on the front side original image and the back side original image is different. In the case of the same page number, the blank page is inserted into the smaller number to generate a coded image.

  For example, as shown in FIG. 4, while the encoded document image D3 in which the front side original image C1 is encoded is one page, the encoded original images D5 and D6 in which the back side original image C2 is encoded are It is 2 pages.

  Therefore, the CPU 16 inserts the blank data D4 into the encoded document image D3 so that the encoded document image on the front side and the encoded document image on the back side have the same page number.

(Operation of information terminal device 1)
Next, the operation of the information terminal device 1 according to the second embodiment of the present invention will be described.

  FIG. 5 is a flowchart showing the processing contents of the information terminal device 1 provided in the printing system according to the second embodiment of the present invention.

  As shown in FIG. 5, when a request for encoding and printing original image data is input (step S201; YES), the CPU 16 functions as an original image interrelation determining means, and based on the interrelation information set in advance. Then, it is determined whether or not there is a mutual relationship between the front side original image and the back side original image of the original image data (step S203).

  When it is determined that there is a mutual relationship (step S203; YES), the CPU 16 functions as an encoding unit, and when it is determined that there is a mutual relationship, a coded image is generated based on the front and back original images. The encoded front image and the encoded back image are generated as (step S205).

  Next, the CPU 16 determines whether the number of pages of the encoded front surface image and the encoded back surface image is different (step S207).

  If it is determined that the number of pages of the encoded front image and the encoded back image is different (step S207; YES), the CPU 16 inserts a blank page in the smaller number so as to obtain the same number of pages (step S209). An image is generated (step S211).

  As a result, since the number of pages of the coded front side image and the number of pages of the coded back side image coincide with each other, the printed coded document has a corresponding relationship between the front and back sides, and the user is confused. It can be prevented.

(Operation of stencil printing apparatus 9)
Next, the operation of the stencil printing apparatus 9 according to the second embodiment of the present invention will be described.

  FIG. 6 is a flowchart showing the processing contents of the stencil printing apparatus 9 according to the second embodiment of the present invention. In the flowchart shown in FIG. 6, the processes to which the same step numbers are attached which are described in the flowchart shown in FIG. 3 have the same process contents, so the description will be omitted.

  As shown in FIG. 6, in step S103, double-sided printing is designated (step S103; NO), and the scanner unit 98 reads both sides of the first encoded document on which the encoded image is printed, and the front and back sides When each encoded document data is output (step S131), the decoding unit 101 determines whether there is a blank page in the output encoded document data (step S301).

  If there is a blank page in the output encoded document data (step S301; YES), the decoding unit 101 deletes the blank page (step S303).

  As described above, according to the stencil printing apparatus 9 according to the second embodiment of the present invention, when there is a blank page in the encoded document data generated by the scanner unit 98, the decoding unit 101 deletes the blank page. Since the encoded document data is decoded, blank pages inserted so as to become the same page in the information terminal device 1 can be deleted and printed so as to be the same as the number of pages of the original document image. It is possible to prevent wasteful increase in the number of printed sheets.

  In the second embodiment of the present invention, the case where the front side original image which is the test question is printed on the front side of the paper and the back side original image which is the answer of the test question is printed on the back side of the paper is described as an example. However, the present invention is not limited to this, a front original image which is a test question may be printed on the front side of the sheet, and a back original picture which is a prohibited original image for prohibiting printing of the test question may be printed on the back side of the sheet.

(Modification)
The present invention is not limited to the above embodiment as it is, and in the implementation stage, the constituent elements can be modified and embodied without departing from the scope of the invention. In addition, various inventions can be formed by appropriate combinations of a plurality of components disclosed in the above embodiments.

  For example, although the case where the stencil printing apparatus 9 is used as the printing apparatus has been described as an example in the embodiment described above, the type of printing apparatus is not limited to this, and can be applied to, for example, an inkjet printing apparatus.

Reference Signs List 1 information terminal device 5 inkjet printer 9 stencil printing device 11 printer driver 19 input unit 20 output unit 21 external storage device 22 disk drive 45 additional information analysis unit 50 disk recording medium 90 control unit 93 external storage device 96 printer unit 97 operation panel 98 Scanner unit 101 Decoding unit 102 Determination unit 103 Print control unit

Claims (2)

An original reading unit that reads an encoded original on which the encoded image is printed and generates encoded original data;
A decoding unit that decodes the encoded document data;
A determination unit that determines whether the images of the plurality of encoded document data match and the lightness is equal to or greater than a predetermined threshold when there is a plurality of encoded document data generated by the document reading unit;
When it is determined by the determination unit that the images of the plurality of encoded document data do not match or the lightness is less than a threshold, the plurality of pieces of encoded document data are decoded based on the document images decoded by the decoding unit. While printing,
After printing based on the document image decoded by the decoding unit, the determination unit determines that the images of the plurality of coded document data match and the lightness is determined to be equal to or more than the threshold value. Print control means for prohibiting printing;
A printing apparatus comprising: A computer for generating an encoded image from an original image, and double-sided printing based on an original image including a front image and a reverse image generated by reading and decoding the encoded image from the encoded original printed based on the encoded image A printing system having a printing device
The computer is
Relationship determining means for determining whether or not there is a relationship between the front image and the back image of the document image based on the set relationship information;
If the interrelation determining means determines that there is an interrelation, if the number of pages of the encoded front image and the encoded back image encoded respectively on the basis of the front image and the back image of the original image is different, the same page And inserting an empty page into a smaller number so as to be a number, and encoding means for generating an encoded image;
The printing device is
Document reading means for reading an encoded document on which the encoded image has been printed and generating encoded document data;
A decoding unit that deletes the blank page and decodes the encoded document data when there is a blank page in the encoded document data generated by the document reading unit;
A determination unit that determines whether the images of the plurality of encoded document data match and the lightness is equal to or greater than a predetermined threshold when there is a plurality of encoded document data generated by the document reading unit;
When it is determined by the determination unit that the images of the plurality of encoded document data do not match or the lightness is less than a threshold, the plurality of pieces of encoded document data are decoded based on the document images decoded by the decoding unit. While printing,
After printing based on the document image decoded by the decoding unit, the determination unit determines that the images of the plurality of coded document data match and the lightness is determined to be equal to or more than the threshold value. And a print control unit that prohibits printing.

Images