JP5119739B2 - Inspection program, inspection system, and inspection method - Google Patents

Description

  The present invention belongs to the technical field of inspection devices, and more specifically, the technical field of inspection devices that inspect printed results (print content itself and dirt, etc.) in printed matter obtained by printing electronic information with a printer or the like. Belonging to.

  In recent years, the entire layout and color scheme are the same for each printed matter, for example, as invoices for usage fees sent to users of portable wireless telephones. However, the contents described are different for each printed matter. Printed materials having such characteristics are widely used.

  On the other hand, when such printed matter is printed and distributed in large quantities based on the corresponding electronic data, it is necessary to check whether the contents match the contents of the original electronic data. Come. In particular, in the case of a printed matter such as the above-mentioned invoice, it is strictly to be prevented that the content of the charge different from the content requested for the person who is the destination of the printed matter is described in the printed matter. The demand for such inspections is increasing.

  On the other hand, when considering the inspection of the printed matter, it is required to inspect the contents of each printed matter at high speed and accurately in view of the large number. In that sense, conventionally, the printed matter is optically used. In general, the contents of the printed matter are inspected using image information obtained as a result. And as an example of such a prior art, there exist some which are described in the following patent document 1, for example.

Here, the printed matter may be printed not only with necessary items printed on only one side but also with necessary items printed on both sides. When imaging information is generated by optically imaging any one surface of such a double-sided printed matter, the imaging information includes not only the content printed on the one surface that was the imaging target. In some cases, information corresponding to the content printed on the other side corresponding to the back side of the one side is included as so-called show-through information.
Japanese Patent Laid-Open No. 2001-96872 (FIGS. 2 and 8 to 10 etc.)

  However, in the above-mentioned Patent Document 1, no description or suggestion is found regarding the optical inspection apparatus considering the show-through.

  On the other hand, when inspecting the printing status of a double-sided printed product using imaging information (imaging information corresponding to the one side) containing the show-through information, the back side that should not originally exist on the one side The printing status of the one side is inspected using the imaging information including the reflection information. As a result, even if the printed material is supposed to be accepted when viewed as only the one surface, the show-through information is included in the imaging information, so that the show-through information is misprinted for the one surface ( As a result, there is a problem in that a printed matter that is supposed to pass is rejected.

  This problem is a problem that appears prominently when, for example, thin printing paper is used to save resources, or when a pattern with flashy colors is printed on the opposite side. This also leads to the problem of inefficiency in the inspection process.

  Therefore, the present invention has been made in view of the above-mentioned problems, and the problem is that, even for a double-sided printed matter with the possibility of show-through, the influence of the show-through is removed and the double-sided printed matter is accurately obtained. It is an object of the present invention to provide an inspection system and inspection method capable of being inspected, and a program for the inspection system.

In order to solve the above-mentioned problem, the invention according to claim 1 prints print target information for one side of a print medium on the one side, and print target information for the other side of the print medium. Is an inspection system for inspecting a double-sided printed matter obtained by printing on the other side, wherein the one side of the obtained double-sided printed matter is optically imaged, and imaging information corresponding to the one side the computer included in the inspection system comprising an imaging means such as a surface line sensor for generating, a Urautsushi information corresponding to said printed information printed on the other face of the double-sided printed material, the one side Storage means for storing show-through information such as show-through color correction table data included in the imaging information generated by imaging the one surface from the side, and the one based on the stored show-through information Correction of the print target information for the surface of , The reference information corresponding to the reference information generating means for generating a reference information as a reference in the examination of one surface, an imaging information pre SL generated, the imaging information generated by imaging the one surface And a comparison means for outputting a comparison result for the one surface, and a back surface master chart preliminarily defined as other surface sample print information which is a sample of the print target information for the other surface Others obtained by imaging the sample printed matter obtained by printing the other side sample print information on the other side only with respect to the contents of the other side sample print information such as data from the one side by the imaging means a said Urautsushi information generating unit, inspection査用program Ru to function as to be further stored in the storage means to generate a back copy information to match the content of the surface sample imaging information, the back copy information generating means Function as The computer is configured to generate the show-through information in association with an ICC (International Color Consortium) profile for each print medium quality used for printing the other-surface sample print information and store the information in the storage unit. In addition, the computer functioning as the storage means is made to function so as to store the generated show-through information for each quality, and the computer functioning as the reference information generating means is The computer that functions to generate the reference information for the one surface corresponding to the print object information for the surface of each other, and further functions as the comparison unit, the print object information for each of the one surface And the reference information for the one surface corresponding to the generated imaging information for each quality, and the comparison result Make it work to output .

Thus, previously stores back copy information other surface that corresponds to any one side of the double-sided printed material of the double-sided printed, generates the reference information using the Urautsushi information being the storage, further the product The computer functions to compare the captured reference information with the imaging information corresponding to the one side and output the result, so the effect of the show-through can be achieved even in the case of double-sided printed materials that may show through. Can be inspected for each side of the double-sided printed matter.
In addition, it is possible to obtain a reference printed matter obtained by printing the contents of the other side sample print information defined in advance on only the corresponding side of the other side sample printed matter from the one side with an imaging means. Since the computer functions so that the show-through information is generated and stored so as to match the contents of the sample-sampling image information, the reference information further using the show-through information generated using the other-side sample print information By correcting and using for inspection, each double-sided printed matter can be inspected quickly and more accurately.
Furthermore, since the computer functions so as to generate the printout information for each quality of the print medium used for printing and perform the comparison inspection for each quality, it is possible to accurately inspect the double-sided printed matter for each quality. it can.
Furthermore, since the computer functions so as to generate the printout information in association with the ICC profile for each quality of the printing medium used for printing and perform the comparative inspection for each quality, the computer functions in association with the ICC profile for each quality. The double-sided printed product can be accurately inspected.

In order to solve the above problem, the invention according to claim 2 is the inspection program according to claim 1 , wherein the show-through information is print target information related to the print target information for the other surface. The print target information color such that the color is the imaging information color related to the imaging information generated by imaging the double-sided printed matter on which the print target information is printed only on the other side from the one side. The print information generated by the computer that functions as the show-through information generation means to correct the print information, and further the computer that functions as the reference information generation means The information is corrected to function to generate the reference information.

  Therefore, the show-through information is the show-through information for correcting the print target information color corresponding to the print target information for the other side to be the image pickup information color in the image pickup information taken from the one side. Even when the printing result on the other side is seen through from one side due to the show-through, the double-sided printed matter can be inspected accurately and quickly in consideration of this.

In order to solve the above-mentioned problem, the invention according to claim 3 is the inspection program according to claim 2 , wherein the show-through information is the other side of the print target information for the other side. For each color used for printing on the print object information color, the color of the print object information color is corrected so that the color of the print object information color is corrected to be the color of the image information color. The print-out information generated by the computer functioning as copy information generation means, and the computer functioning as the reference information generation means is configured to change the print target information for each color based on the print-out information. Correct and function to generate the reference information.

  Therefore, the computer functions so as to generate the reference information using the print-out information for each color related to printing, so that the print target information color related to the other surface can be more accurately converted to the imaging information color from one surface side. It can be corrected.

In order to solve the above-mentioned problem, the invention according to claim 4 is the inspection program according to claim 1 , wherein the show-through information is the print target information for the other side. A two-dimensional error between the imaging information obtained by imaging the double-sided printed matter printed only on the other side by the imaging unit and the print target information for the other side is corrected. Therefore, it is the show-through information generated by the computer that functions as the show-through information generation means, and further, the computer that functions as the reference information generation means corrects the print target information based on the show-through information. And function to generate the reference information.

  Therefore, since the show-through information is the show-through information for correcting a two-dimensional error between the print target information for the other side and the image pickup information as the image pickup result, Even when the printing result on the surface can be seen through from the one surface side, the double-sided printed matter can be inspected accurately and quickly in consideration of this.

In order to solve the above-mentioned problem, the invention according to claim 5 is the inspection program according to any one of claims 1 to 4 , wherein the computer functioning as the reference information generating means is Generating the reference information by correcting the portion using the show-through information corresponding to the portion of the print target information having a lightness equal to or lower than a preset threshold lightness among the print target information for the surface To function.

  Therefore, the computer functions to generate reference information by correcting the part using the show-through information corresponding to the part having the lightness equal to or lower than the threshold lightness in the print target information for one side. It is possible to prevent an error from being included in the reference information due to the use of the show-through information corresponding to the portion with high brightness as the printing target information for the surface.

In order to solve the above problem, the invention according to claim 6 is the inspection program according to any one of claims 1 to 5 , wherein the imaging information corresponding to one of the one surface is generated. In parallel with the processing, the computer is further caused to function as control means for controlling the reference information generation means and the imaging means so as to execute the reference information generation processing corresponding to the one surface.

  Therefore, the process for generating the reference information using the stored show-through information is executed in parallel with the imaging process by the imaging unit, and the generated reference information is compared with the imaging information generated by the imaging process. Since the computer functions to inspect the double-sided printed matter, it is possible to shift to the comparison process immediately after the imaging information is generated, and the error caused by the imaging process is corrected in the reference information itself, so that both sides can be accurately and quickly Inspection of printed matter can be performed.

In order to solve the above problems, the invention according to claim 7, in the inspection program according to claim 6, the imaging processing of the one surface by the imaging means, the one by the reference information generating unit And generating the reference information corresponding to each of the plurality of print target information to be printed in parallel and continuously on the plurality of the one surface. And causing the computer that functions as the control means to function.

  Therefore, the imaging process corresponding to one piece of print target information and the reference information generation process are executed in parallel, and the simultaneous and parallel process is repeated for a plurality of pieces of print target information to be printed continuously. Since the computer functions, the double-sided printed material can be inspected continuously in a short time even when a plurality of pieces of information to be printed are continuously printed.

In order to solve the above-mentioned problem, in the invention according to claim 8 , in the inspection program according to claim 6 or 7 , the show-through information corresponds to an imaging process of the double-sided printed matter by one imaging unit. And the computer functioning as the reference information generating unit generates the reference information corresponding to the print target information using the show-back information for each of the different print target information. Make it work.

  Therefore, since one piece of show-through information is commonly used for different print target information, and the computer functions to generate reference information for each different print target information, the print target information having different contents can be used. Even if it exists, it can test | inspect either side in the double-sided printed matter corresponding to these printing object information correctly using the reference | standard information corresponding to each.

In order to solve the above problem, the invention according to claim 9 prints print target information for one side of the print medium on the one side, and print target information for the other side of the print medium. In the inspection system for inspecting the double-sided printed matter obtained by printing on the other side, the one side of the obtained double-sided printed matter is optically imaged to generate imaging information corresponding to the one side an imaging means such as a surface line sensor, said a Urautsushi information corresponding to the other of said printed information printed on the surface of the double-sided printed material, by imaging the surface of the one from the one surface side Storage means such as an HDD (Hard Disk Drive) unit for storing the show-through information included in the generated imaging information, and the print target information for the one surface based on the stored show-through information The standard information used as the standard in the inspection of the one surface is corrected. A reference information generating means such as a processing unit for generating the image, the generated imaging information, and the reference information corresponding to the imaging information generated by imaging the one surface, Comparison surface such as a comparison processing unit that outputs a comparison result for the surface, and other surface such as back surface master chart data that is defined in advance as other surface sample print information that is a sample of the print target information for the other surface The content of the sample print information, the sample print information obtained by printing the sample printed matter obtained by printing the other side sample print information only on the other side from the one side by the imaging means. Including a processing section or the like that generates the show-through information so as to match the content and further stores the information in the storage means, and the show-out information generation means includes the other-side sample print information. Quality of print media used for printing And generating the show-through information in association with the ICC profile and storing it in the storage means. The storage means stores the generated show-through information for each quality, and the reference information generating means Generating the reference information for the one surface corresponding to the printing object information for each of the one surface for each time, and the comparing means further corresponding to the printing object information for each of the one surface The imaging information and the reference information for the one surface corresponding to the generated imaging information are compared for each quality, and the comparison result is output .

Thus, previously stores back copy information other surface that corresponds to any one side of the double-sided printed material of the double-sided printed, generates the reference information using the Urautsushi information being the storage, further the product The result is output by comparing the reference information obtained and the imaging information corresponding to the one side, so even in the case of a double-sided printed matter with the possibility of show-through, the effect of the show-through is taken into account. Each side of the printed material can be inspected.
In addition, it is possible to obtain a reference printed matter obtained by printing the contents of the other side sample print information defined in advance on only the corresponding side of the other side sample printed matter from the one side with an imaging means. Since the show-through information is generated and stored so as to match the contents of the face sample image pickup information, the show-out information generated using the other face sample print information is further used to correct the reference information for inspection. By using it, each double-sided printed matter can be inspected quickly and more accurately.
Furthermore, since the printout information is generated for each quality of the print medium used for printing and the comparison inspection is performed for each quality, the double-sided printed material can be accurately inspected for each quality.
Furthermore, since the printout information is generated in association with the ICC profile for each quality of the printing medium used for printing and the comparison inspection is performed for each quality, the double-sided printed material is accurately inspected in association with the ICC profile for each quality. Can be executed.

In order to solve the above problem, the invention according to claim 10 prints print target information for one side of the print medium on the one side, and print target information for the other side of the print medium. Is an inspection system for inspecting a double-sided printed matter obtained by printing on the other side, wherein the one side of the obtained double-sided printed matter is optically imaged, and imaging information corresponding to the one side Imaging means , such as a surface line sensor, for generating image, and show-through information corresponding to the print target information printed on the other surface of the double-sided printed material, wherein the one surface is imaged from the one surface side Storage means such as an HDD unit for storing the show-through information included in the imaging information generated in the above-described manner, in an inspection method executed in an inspection system, based on the stored show- through information Correct the print target information for one side , A reference information generation step for generating reference information as a reference in the inspection of the one surface, the generated imaging information, and the reference information corresponding to the imaging information generated by imaging the one surface And a comparison step for outputting a comparison result for the one side, and back side master chart data preliminarily defined as other side sample print information which is a sample of the print target information for the other side The other surface obtained by imaging the sample printed matter obtained by printing the other surface sample print information only on the other surface with the imaging means from the one surface side. seen containing a Urautsushi information generation step of further stored in the storage means to generate the back copy information to match the contents of the sample imaging information, and in the back shooting information generating step, the other face sample printing Used for printing information The print information is generated in association with an ICC profile for each print medium quality to be stored in the storage means, and the storage means stores the generated print information for each quality, and the reference information In the generation step, the reference information for the one surface corresponding to the print target information for the one surface is generated for each quality, and further, in the comparison step, the reference information for each of the one surface is generated. The imaging information corresponding to the print target information and the reference information for the one surface corresponding to the generated imaging information are compared for each quality, and the comparison result is output. The

Therefore, the back side information of any other side corresponding to any one side of the double-sided printed material that has been printed on both sides is stored in advance, the reference information is generated using the stored back side information, and the Since the generated reference information and the imaging information corresponding to the one surface are compared and the result is output, even in the case of double-sided printed matter that may show through, the effect of the show-through is taken into account. Each side of the double-sided printed product can be inspected.
In addition, it is possible to obtain a reference printed matter obtained by printing the contents of the other side sample print information defined in advance on only the corresponding side of the other side sample printed matter from the one side with an imaging means. Since the show-through information is generated and stored so as to match the contents of the face sample image pickup information, the show-out information generated using the other face sample print information is further used to correct the reference information for inspection. By using it, each double-sided printed matter can be inspected quickly and more accurately.
Furthermore, since the printout information is generated for each quality of the print medium used for printing and the comparison inspection is performed for each quality, the double-sided printed material can be accurately inspected for each quality.
Furthermore, since the printout information is generated in association with the ICC profile for each quality of the printing medium used for printing and the comparison inspection is performed for each quality, the double-sided printed material is accurately inspected in association with the ICC profile for each quality. Can be executed.

  According to the inspection program according to the present invention, the back side information of any other side corresponding to any one side of the double-sided printed matter that has been printed on both sides is stored in advance, and the stored back side information is used. The computer functions to generate reference information, compare the generated reference information with imaging information corresponding to the one surface, and output the result. Even in the case of a printed matter, each side of the double-sided printed matter can be inspected in consideration of the influence of the show-through.

Further, according to the inspection apparatus and the inspection method according to the present invention, the back side information on any other side corresponding to any one side of the double-sided printed matter that has been printed on both sides is stored in advance, and the stored back side is stored. Since the reference information is generated using the copy information, the generated reference information is compared with the imaging information corresponding to the one surface, and the result is output, so that the double-sided printed material with the possibility of show-through is output. Even in this case, each side of the double-sided printed material can be inspected in consideration of the influence of the show-through.
In addition, it is possible to obtain a reference printed matter obtained by printing the contents of the other side sample print information defined in advance on only the corresponding side of the other side sample printed matter from the one side with an imaging means. Since the show-through information is generated and stored so as to match the contents of the face sample image pickup information, the show-out information generated using the other face sample print information is further used to correct the reference information for inspection. By using it, each double-sided printed matter can be inspected quickly and more accurately.
Furthermore, since the printout information is generated for each quality of the print medium used for printing and the comparison inspection is performed for each quality, the double-sided printed material can be accurately inspected for each quality.
Furthermore, since the printout information is generated in association with the ICC profile for each quality of the printing medium used for printing and the comparison inspection is performed for each quality, the double-sided printed material is accurately inspected in association with the ICC profile for each quality. Can be executed.

  Therefore, according to the present invention, it is possible to accurately inspect the double-sided printed matter with the possibility of show-through, removing the influence of the show-through.

  Next, the best mode for carrying out the present invention will be described with reference to FIG. The embodiment described below is an embodiment in the case where the present invention is applied to an inspection system that optically inspects for the presence or absence of omission or dirt in a double-sided printed material such as the above-described bill. FIG. 1 is a block diagram showing a schematic configuration of the inspection system according to the embodiment.

  First, as the double-sided printed material to be inspected in the inspection system according to the present invention, for example, characters and the like illustrated in FIG. 1A are printed on the front surface SF, and the back surface RV is illustrated in FIG. 1B, for example. And double-sided printed material PP on which a pattern to be printed is printed.

  As shown in FIG. 1C, the inspection system S according to the embodiment includes a reference data generation computer 1, a print data generation computer 2, an inspection device 3, and an inkjet method, a laser method, or a plate cylinder method, for example. A front surface line sensor 5 and a back surface line sensor 8 as image pickup means in which image pickup devices such as a CCD (Charge Coupled Device) are arranged in a single row or a plurality of rows, changeover switches 6 and 9, And a trigger signal generator 7 having a detector 7A for detecting the passage of the double-sided printed product PP. In this configuration, the front surface line sensor 5 and the rear surface line sensor 8 are disposed at positions facing each other and facing each other. The front surface sensor 5 is capable of simultaneously imaging the front surface SF of the double-sided printed material PP and the back surface line sensor 8 of the back surface RV of the double-sided printed material PP.

  Next, the outline operation of each component will be described.

  First, an outline operation at the time of inspection of an actual double-sided printed material PP will be described. At the time of the inspection, the change-over switch 6 is switched to the inspection apparatus 3 side, for example, by an operator's operation or automatically. Further, the changeover switch 9 is provided on the front line sensor 5 side at the timing when the imaging data Scmr1 of the front surface SF in the double-sided printed product PP is to be acquired, and on the back surface at the timing of acquiring the imaging data Scmr2 of the back surface RV in the double-sided printed material PP. Switching to the line sensor 8 side is performed, for example, by an operator's operation or automatically.

  At the time of actually inspecting the double-sided printed material PP, the print data generation computer 2 reads the contents of each double-sided printed material PP itself (that is, for example, the content itself for the front side and the back side of the above-mentioned bill, etc. Print data Sprint corresponding to a different content for each PP is generated and output to the printer 4 and the reference data generation computer 1, respectively.

  As a result, the printer 4 continuously performs a predetermined print process corresponding to each of the above-described methods used in the printer 4 by using each print data Sprint, and each print data Sprint. The double-sided printed material PP on which characters, figures, and the like corresponding to the contents are printed on both sides is continuously manufactured.

  Then, each double-sided printed product PP is continuously conveyed for each double-sided printed material PP to the imaging range of each of the front surface line sensor 5 and the back surface line sensor 8 by a conveying device (not shown) such as a belt conveyor. In addition, by providing the front surface line sensor 5 and the rear surface line sensor 8 according to the embodiment in the printer 4, the conveyance device is omitted, and the double-sided printed material PP by the front surface line sensor 5 and the rear surface line sensor 8 in the printer 4. You may image each surface.

  Thereby, the surface line sensor 5 continuously images the surface SF of each moving double-sided printed product PP, generates image data Scmr1 corresponding to the contents of each surface SF, and the changeover switch 9 and the inspection device 3. The imaging data Scmr is output to the inspection device 3 as the inspection data Stest via the selector switch 6 that is switched to the side. In addition, the back surface line sensor 8 generates the back surface RV of each moving double-sided printed material PP (the inspected data Stest output to the inspection device 3) in a time-sharing manner with the generation of the inspection data Stest corresponding to the front surface SF. The back surface RV corresponding to the back side of the front surface SF) is continuously imaged, and image data Scmr2 corresponding to the contents of each back surface RV is generated and switched to the selector switch 9 and the inspection device 3 side. The imaging data Scmr is output to the inspection device 3 via the selector switch 6 as the inspection data Stest.

  At this time, the fact that each double-sided printed product PP is moving within the imaging ranges of the front surface line sensor 5 and the back surface line sensor 8 (the same imaging range in the case of FIG. 1C) indicates that the detector 7A is moving. The trigger signal generator 7 detects the double-sided printed product PP as it moves while touching. Then, the trigger signal generation unit 7 generates a trigger signal Stg having different aspects when the double-sided printed material PP is moving within the imaging range and when the double-sided printed material PP is not within the imaging range. Output to the inspection device 3. Here, the signal waveform of the trigger signal Stg is, for example, “HIGH” when the double-sided printed material PP is moving within the imaging range, and “LOW” when the double-sided printed material PP is not within the imaging range. The signal waveform is as follows.

  In addition to the method using the contact between the detector 7A and the double-sided printed material PP described above, the generation signal in the trigger signal generation unit 7 is emitted from the trigger signal generation unit 7, for example. It may be configured to optically detect that the double-sided printed material PP is blocking the infrared ray or the laser beam, and to generate a trigger signal Stg that becomes “HIGH” during the blocking period.

  On the other hand, the reference data generation computer 1 to which each print data Sprint is inputted, respectively, prints each double-sided printed matter PP obtained by printing each print data Sprint by the printer 4 based on each print data Sprint. Comparison reference data Sref to be compared in the inspection apparatus 3 with respect to the corresponding inspected data Stest is generated and output to the inspection apparatus 3.

  Here, the comparison reference data Sref is data obtained by converting the resolution as the print data Sprint into the resolutions of the front surface line sensor 5 and the rear surface line sensor 8 respectively. In addition to this, the comparison reference data Sref is used for the imaging processing in the front surface line sensor 5 and the back surface line sensor 8 and the quality of paper or the like as the printing medium in the double-sided printed material PP (color of the paper itself or unevenness of the surface). An image as a reference for comparison to be obtained by adding each print data Sprint with the influence of the error included in the inspected data Stest and the influence of the show-through on the opposite surface for each face. This data is generated by the reference data generation computer 1 through conversion processing and correction processing using each table described later.

  Further, the comparison reference data Sref may be generated by the reference data generation computer 1 by the conversion process and the correction process associated with the so-called ICC profile due to the quality of the paper or the like. At this time, the ICC profile is profile information that is referred to when a color is braked between a personal computer or the like, an input device such as a digital camera or a scanner, and an output device such as a display or a color printer. In addition, the color areas that can be developed by each input / output device and the color reproduction characteristics are described, which are indispensable for color management that requires accurate color reproduction.

  Then, the contents of the comparison reference data Sref from the reference data generation computer 1 and the contents of the inspected data Stest from the changeover switch 6 are configured as the double-sided printed material PP by using a technique such as pattern matching, color, etc. In each point, comparison is made for each surface. As a result of this comparison, if a double-sided printed material PP is found to be defective printing, the operator of the inspection apparatus 3 is notified of this. This notification is based on, for example, a warning display on the display or a warning sound generated by a voice or buzzer sound.

  Next, generation processing of each correction table in the so-called lookup table (Look Up Table (LUT)) format for generating the comparison reference data Sref, which is executed before the series of inspections described above, will be described.

(I) Correction Table Generation Processing for Color First, generation processing for the correction table for the color of the double-sided printed material PP among the correction tables will be described.

  Note that the correction table for colors according to the embodiment includes the printing for the surface SF in order to correct the influence of errors that are included in the data to be inspected Stest due to the quality of the paper as the printing medium described above. A correction table for executing correction processing on the data Sprint (hereinafter, the correction table will be referred to as an error color correction table) and the influence of the above error as well as the influence of show-through for each side of the double-sided printed material PP. There are two correction tables (hereinafter, the correction table is referred to as a show-through color correction table) for executing the correction process on the print data Sprint for the back surface RV. The show-through color correction table generation process will be described.

  In the following description, when inspecting the content printed on the front surface SF, when the content printed on the back surface RV (for example, see FIG. 1B) appears on the front surface SF side as a show-through, Generation of a show-through color correction table (also a show-through color correction table for removing the influence of the error related to the imaging process on the surface SF) corresponding to a change in the colors constituting the printed content due to the show-through Processing will be described.

  When inspecting the content printed on the back surface RV, when the content printed on the front surface SF (see, for example, FIG. 1A) appears on the back surface RV side as a show-through, it is printed on the front surface SF by the show-through. The generation process of the show-through color correction table corresponding to the change in the color constituting the content is basically the same generation process as the generation process described below, only by replacing the front surface SF and the rear surface RV. .

  In the generation process of the show-through color correction table, the print data generation computer 2 uses a back side master chart, which will be described later, which is a color sample for creating the show-through color correction table and is a color sample of the content printed on the back side RV. Corresponding back surface master chart data is generated and output to the printer 4 and the reference data generation computer 1 as the print data Sprint.

  Thereby, the printer 4 prints and outputs the print data Sprint as the back surface master chart data only on the back surface RV of the double-sided printed material PP that becomes the back surface master chart, and conveys it to the imaging range of the front surface line sensor 5.

  Then, the front surface line sensor 5 has only the double-sided printed material PP (that is, the back surface RV on the printing medium such as paper used when printing out the double-sided printed material PP to be inspected at the time of the subsequent inspection). Image of the double-sided printed material PP for generating the show-through color correction table (for the front surface SF) printed using the back side master chart data is generated to generate imaging data Scmr1 corresponding to the double-sided printed material PP, The back side RV master chart imaging data Scrt (hereinafter referred to as the back side RV master chart) via the changeover switch 9 switched to the front surface line sensor 5 side and the changeover switch 6 switched to the reference data generation computer 1 side. The imaging data Scrt is simply referred to as back side master chart imaging data Scrt). Output to the computer 1.

  As described above, the print data Sprint as the back surface master chart data is compared with the back surface master chart imaging data Scrt obtained by imaging the back surface master chart corresponding to the print data Sprint with the front surface line sensor 5. The content of the print data Sprint as the master chart data is equal to the content of the back surface master chart imaging data Scrt (obtained by imaging from the front surface SF side) in terms of the configuration and color as the back surface master chart. Correction data for correcting the contents of the print data Sprint as the back master chart data is generated, and the generated correction data is stored in a nonvolatile manner as the show-through color correction table.

(II) Generation processing of position / rotation correction table Next, the generation processing of the position / rotation correction table, which is the table for the positional deviation and rotational deviation of the printing result in the double-sided printed product PP, among the above-described tables will be described. To do.

  In the following description, as in the case of the show-through color correction table, when inspecting the content printed on the front surface SF, when the content printed on the back surface RV appears on the front surface SF side as a show-through, A process of generating a position / rotation correction table that corrects the positional deviation from the regular printing position and the rotational deviation from the regular printing angle in the content itself printed on the back surface RV will be described.

  In the case where the content printed on the back surface RV is inspected, when the content printed on the front surface SF appears on the back surface RV side as a show-through, the content printed on the front surface SF itself is printed from the regular printing position. The position / rotation correction table generation process for correcting misalignment and rotational deviation from the normal printing angle is basically only described below, with the front surface SF and the rear surface RV being interchanged. The generation process is the same as the generation process.

  In the process of generating the position / rotation correction table, the print data generation computer 2 generates back side master chart data corresponding to the back side master chart, which was a sample for creating the show-through color correction table, and prints it. The data Sprint is output to the printer 4 and the reference data generation computer 1.

  Thereby, the printer 4 prints and outputs the print data Sprint as the back surface master chart data only on the back surface RV as the double-sided printed material PP as the back surface master chart, and conveys it to the imaging range of the front surface line sensor 5.

  Then, the back surface line sensor 8 images the double-sided printed material PP for generating the position / rotation correction table (for the front surface SF) that has been printed using the back surface master chart data only on the back surface RV, and the double-sided printed material PP. Is generated as back side master chart imaging data Scrt via the changeover switch 9 switched to the backside line sensor 8 side and the changeover switch 6 switched to the reference data generation computer 1 side. The data is output to the reference data generation computer 1.

  As described above, the print data Sprint as the back surface master chart data is compared with the back surface master chart imaging data Scrt obtained by imaging the back surface master chart corresponding to the print data Sprint with the back surface line sensor 8, and the back surface The content of the print data Sprint as the master chart data is equal to the content of the back surface master chart imaging data Scrt (obtained by imaging from the back surface RV side) in terms of positional deviation and rotational displacement as the back surface master chart. Then, correction data for correcting the contents of the print data Sprint as the back side master chart data is generated, and the generated correction data is stored in a nonvolatile manner as the position / rotation correction table.

  Then, the double-sided printed material PP according to the present invention is inspected using the show-through color correction table and the position / rotation correction table stored by the respective generation processes.

  Next, the Example which shows the detailed structure and detailed operation | movement of the test | inspection system S provided with the structure mentioned above is described using FIG. 2 thru | or FIG.

  2 is a block diagram showing detailed configurations of the reference data creation computer 1 and the inspection apparatus 3 included in the inspection system S according to the embodiment. FIG. 3 shows the show-through color correction table and position according to the embodiment. FIG. 4 is a flowchart showing generation processing of the rotation correction table, FIG. 4 is a diagram showing generation processing of the show-through color correction table and the position / rotation correction table, and FIG. 5 is an inspection of the double-sided printed material PP in the inspection system S. FIG. 6 and FIG. 7 are diagrams showing the flow of the inspection.

  In addition, in the examples described below, the case where the contents printed on the front surface SF in the double-sided printed material PP on which the necessary printing is performed on each of the front surface SF and the back surface RV is described corresponding to the above embodiment. This is an example. When inspecting the content printed on the back surface RV in the double-sided printed product PP, basically, an embodiment obtained by replacing the front surface SF and the back surface RV in the following description corresponds to the inspection of the back surface RV. This is an example.

(I) Detailed Configuration of Reference Data Generation Computer First, the detailed configuration of the reference data generation computer 1 according to the embodiment will be described with reference to FIG.

  As shown in FIG. 2A, the reference data generation computer 1 according to the embodiment includes a memory 10, an HDD (Hard Disc Drive) 11 as a storage means containing a hard disk (not shown), an interface unit 12, and a reference. The processing unit 13 as information generation means, an operation unit 14 configured by a keyboard or a mouse, and a display 15 configured by a CRT (Cathode Ray Tube) or a liquid crystal display are configured.

  In this configuration, when generating the show-through color correction table data corresponding to the show-through color correction table and the position / rotation correction table data corresponding to the position / rotation correction table, which are prerequisites for the inspection of the double-sided printed product PP, The interface unit 12 includes the print data Sprint as the back master chart data output from the print data generation computer 2 and the back master chart imaging data Scrt output through the changeover switches 9 and 6. On the other hand, the input interface process is performed, and the result is output to the processing unit 13, respectively.

  Then, the processing unit 13 to which the print data Sprint (back surface master chart data) and the back surface master chart imaging data Scrt (imaging data obtained by imaging the back surface master chart by the front surface line sensor 5) are respectively input. As described above, the print data obtained by reversing the print data Sprint as the back side master chart data (hereinafter referred to as the reverse print data) and the back side master chart imaging data Scrt are compared, Correction data for correcting the content of the reverse print data is generated so that the content of the reverse print data is equal to the content of the back surface master chart imaging data Scrt at the point of the color, and the generated correction data is used as the back side. The reflected color correction table data is stored in the HDD 11.

  On the other hand, with respect to the position / rotation table data, print data Sprint as back surface master chart data and back surface master chart imaging data Scrt (imaging data obtained by imaging the back surface master chart by the back surface line sensor 8) are included. Each of the input processing units 13 compares the print data Sprint as the back surface master chart data with the back surface master chart imaging data Scrt as described above, and the content of the print data Sprint as the back surface master chart data is Correction data for correcting the content of the print data Sprint as the back surface master chart data is generated so as to be equal to the content of the back surface master chart imaging data Scrt in terms of positional deviation and rotational displacement, and the generated correction data The position / rotation correction table HDD11 to be stored in as data.

  It should be noted that other data necessary for the generation processing of the show-through color correction table data and the position / rotation table data is output to the memory 10 as the memory signal Sm, temporarily stored, and further processed as necessary. The data is read again as the memory signal Sm by the unit 13 and used for necessary processing. Further, information to be presented to the operator or the like in the generation process is output to the display 15 as a display signal Sdp and displayed on the display 15.

  Next, when inspecting the double-sided printed material PP using the generated show-through color correction table and the position / rotation correction table, the interface unit 12 outputs the print data output from the print data generation computer 2. A predetermined input interface process is applied to Sprint and the result is output to the processing unit 13.

  On the other hand, the show-through color correction table and the position / rotation correction table already generated before the start of the inspection are already recorded in the HDD 11 as show-through color correction table data and position / rotation table correction data, respectively. .

  The processing unit 13 to which the print data Sprint is input converts the resolution in the front surface print data Sprint into the resolution in the front surface line sensor 5 and converts the resolution in the back surface print data Sprint into the resolution in the back surface line sensor 8. Next, the show-through color correction table data and the position / rotation correction table data recorded in advance from the HDD 11 are read out as HDD signals Shdd, and the contents of the print data Sprint are read out. Correction is made using the show-through color correction table data and the position / rotation correction table data included in the HDD signal Shdd, and the contents of the corrected print data Sprint are combined with the front and back surfaces, and then the comparison reference data. It is output to the interface unit 12 as Sref.

  It should be noted that other data necessary for the generation processing of the comparison reference data Sref is output to the memory 10 as the memory signal Sm and temporarily stored. Then, it is read again as the memory signal Sm by the processing unit 13 as necessary, and used for the processing. Further, information to be presented to the operator or the like in the process is output to the display 15 as a display signal Sdp and displayed on the display 15.

  Next, the interface unit 12 performs a preset output interface process on the comparison reference data Sref output from the processing unit 13 and outputs the result to the inspection apparatus 3.

  In the processing at the time of the inspection and the generation processing of the show-through color correction table data and the position / rotation correction table data, the processing unit 13 operates the operation signal Sop corresponding to the command operation executed by the operator in the operation unit 14. Based on the above, it operates to execute the processing at the time of the inspection and the generation processing of the show-through color correction table data and the position / rotation cloth table data, and also comprehensively controls the other components constituting the comparison reference data generation computer 1 To do.

(II) Detailed Configuration of Inspection Apparatus Next, the detailed configuration of the inspection apparatus 3 according to the embodiment will be described with reference to FIG.

  As shown in FIG. 2B, the inspection apparatus 3 according to the embodiment includes a memory 20, an interface unit 21, a comparison processing unit 23 as a comparison unit, and an operation unit 24 including a keyboard or a mouse. And a display 25 composed of a CRT or a liquid crystal display.

  In this configuration, when the double-sided printed material PP is inspected, the interface unit 21 performs a preset input interface process on the comparison reference data Sref output from the reference data generation computer 1 and performs a comparison processing unit. To 23.

  In parallel with this, the interface section 21 responds to the data to be tested Stest output from the changeover switch 6 switched to the inspection apparatus 3 side and the trigger signal Stg output from the trigger signal generation section 7. However, the input interface process is similarly performed and the result is output to the comparison processing unit 23.

  Then, the comparison processing unit 23 to which the data to be inspected Stest and the comparison reference data Sref are respectively input indicates the contents of the comparison reference data Sref and the contents of the data to be inspected Stest by the trigger signal Stg as described above. In accordance with the movement timing of the double-sided printed material PP to be printed, for example, the configuration and color are compared by a method such as pattern matching.

  Other data necessary for the comparison processing is output to the memory 20 as the memory signal Sm and temporarily stored, and further read out as the memory signal Sm again by the processing unit 23 as necessary. It is used for comparison processing.

  Thereafter, as a result of the comparison, if a double-sided printed material PP is found to be defective printing, a display signal Sdp is output to the display 25 to display a warning on the display 25. In this case, instead of the warning display, for example, the above warning sound generation or the like (including the print stop instruction process for the printer 4 itself) may be performed.

  Further, in the processing at the time of the inspection, the processing unit 23 operates to execute the inspection processing based on the operation signal Sop corresponding to the command operation executed by the operator in the operation unit 24, and the inspection device 3 is operated. Centrally control other constituent members.

(III) Generation processing of each correction table data Next, the generation processing of the show-through color correction table data and the position / rotation correction table data used for generating the reference data Sref in the inspection will be described in detail with reference to FIG. This will be described with reference to FIG. At the time of execution of the generation process, the changeover switch 6 is switched to the reference data generation computer 1 side as described above, and the changeover switch 9 is provided on the front surface line sensor 5 side or the rear surface line sensor as necessary. It can be switched to one of the 8 sides.

(A) Process for generating show-through color correction table data First, the process for generating show-through color correction table data (steps S1 to S11 in FIG. 3 and FIG. 4A) will be described.

  In the generation process of the show-through color correction table data, first, print data Sprint (see the upper left of FIG. 4A) as corresponding back surface master chart data is generated by the print data generation computer 2 (step S1), respectively. The data is output to the reference data generation computer 1 and the printer 4 (step S2).

  The reference data generation computer 1 that has received the print data Sprint (step S4) inverts the left and right (left and right as the print result) on the print data Sprint (step S6; see FIG. 4A), and The reverse print data is temporarily stored in the memory 10 or the HDD 11.

  On the other hand, the printer 4 that has received the print data Sprint (step S3) prints the back master chart data corresponding to the print data Sprint on the back surface RV of the print medium to be the double-sided printed material PP, and the double-sided printed material PP as the printing result. (That is, the double-sided printed material PP on which the back master chart is printed only on the back surface RV) is conveyed into the imaging range of the front surface line sensor 5 (step S5). Then, the front surface line sensor 5 images the conveyed double-sided printed material PP from the front surface SF side, and the image data obtained as a result is time-divided to the front surface line sensor 5 side as image data Scmr1 of the back surface master chart. It is input to the changeover switch 9 that has been changed, and is further transmitted to the reference data generation computer 1 via the changeover switch 6 as back side master chart imaging data Scrt (obtained by imaging from the front side SF) (step 7). ).

When the reference data generation computer 1 receives the back side master chart imaging data Scrt (step S8), the processing unit 13 in the reference data generation computer 1 stores one of the reverse print data temporarily stored. The color of the patch PT and the color of the corresponding patch PT in the back surface master chart imaging data Scrt are read and compared (step S9; see FIG. 4A), and the print data Sprint as the back surface master chart is read. The color of the patch PT (combination of R, G, and B) as the color of the corresponding patch PT in the back surface master chart image data Scrt (the color obtained by imaging the print data Sprint printed on the back surface RV from the front surface SF) R _R, combinations of _{G R} and _{B R.} correction value for the reference 6) (to KazuSatoshi, the show-through color correction multiplying value as table data) is calculated for the single patch PT (step S10), and is temporarily stored in the memory 10 (step S11). Steps S9 to S11 are repeated for each patch PT corresponding to all the patches PT included in the print data Sprint and back surface master chart imaging data Scrt shown in FIG. 4A, and finally for all the patches PT. The correction value is stored. A more detailed configuration of the show-through color correction table will be described in detail later.

  The show-through color correction table data is generated by the processes in steps S1 to S11 described above, and stored and stored in the memory 10 or the HDD 11.

  Note that the generation processing of an error color correction table, which is another color correction table according to the embodiment, is described, for example, in paragraphs [0088] to [0092] of the specification of Japanese Patent Application No. 2007-40450 filed earlier by the present applicant. The generation process shown in FIG. 5 can be used.

(B) Position / Rotation Correction Table Data Generation Processing Next, the position / rotation correction table data generation processing (steps S12 to S16 in FIG. 3 and FIG. 4B) will be described. At this time, the selector switch 9 is switched to the back surface line sensor 8 side.

  As the generation processing of the position / rotation table data, in parallel with the imaging processing from the front surface SF side in step S7, the back surface line sensor 8 detects the imaging range of the back surface line sensor 8 (imaging of the front surface line sensor 5). The double-sided printed material PP (which is also a range) is imaged from the back surface RV side (the back surface master chart is printed only on the back surface RV). Then, the image data obtained as a result is input as the back surface master chart image data Scmr2 to the changeover switch 9 which is switched to the back surface line sensor 8 in a time-division manner, and further (obtained by imaging from the back surface RV side). I) The back side master chart image data Scrt is transmitted to the reference data generation computer 1 via the changeover switch 6 (step 12).

  Then, the reference data generation computer 1 prints the print data Sprint as back side master chart data in the memory 10 or the HDD 11 in the reference data generation computer 13 in steps S1 and S2 (refer to the left side of FIG. 4B). If the back side master chart imaging data Scrt is received in a state where no print data Sprint is stored (step S13), the processing unit 13 in the reference data generation computer 1 corresponds to the stored print data Sprint. The overall shape of the back surface master chart to be performed and the overall shape as the back surface master chart imaging data Scrt are compared in terms of the position and rotation state (step S14; see FIG. 4B), and as the back surface master chart. The shape of the back side master chart imaging data Scrt Then, a correction value (that is, a multiplication value as the position / rotation correction table data) for calculating the entire shape is calculated for the entire back surface master chart (step S15) and stored in the memory 10 or the HDD 11. (Step S16). A more detailed configuration of the position / rotation correction table will be described later in detail.

  The position / rotation correction table data is generated by the processes in steps S12 to S16, and stored in the memory 10 or the HDD 11.

  After each correction table data is generated by the processing of steps S1 to S16 described above, the start of actual inspection is waited.

(IV) Flow of inspection Next, the flow of inspection of the double-sided printed material PP executed in the inspection system S including the reference data generation computer 1 and the inspection device 3 having the detailed configuration described above will be described more specifically. This will be described with reference to FIGS.

  5 is a flowchart showing the inspection process per double-sided printed material PP, FIG. 6 is a diagram conceptually showing the flow of the inspection per double-sided printed material PP, and FIG. 7 shows the inspection process. It is a timing chart which shows a flow in time series.

  As shown in FIG. 5, as the inspection, first, print data Sprint for the front surface SF (that is, print data Sprint having contents to be printed on the front surface SF of the double-sided printed product PP) and print data for the back surface RV When Sprint (that is, print data Sprint having contents to be printed on the back surface RV of the double-sided printed product PP) is generated in the print data generation computer 2, each of the print data Sprints is the reference data generation computer 1 and the printer 4 respectively. (Steps S20 to S22 and S29).

  Thereafter, the printer 4 performs double-sided printing using each print data Sprint, manufactures a double-sided printed material PP, and transports it within the imaging range of each of the front surface line sensor 5 and the back surface line sensor 8. Thereby, the front surface line sensor 5 images the front surface SF of the double-sided printed material PP and outputs it as inspection data Stest to the inspection device 3 via the changeover switches 9 and 6 (step S39).

  On the other hand, the reference data generation computer 1 from which each print data Sprint has been output separately performs the resolution conversion process on the print data Sprint for the front surface SF and the print data Sprint for the back surface RV (steps S23 and S23). S30 (see FIG. 6), the conversion print data Smod is generated for the front surface SF and the rear surface RV, respectively, and is temporarily stored in the memory 10.

  Next, using the error color correction table data corresponding to the error color correction table (indicated by reference numeral “T3” in FIG. 6) stored in the HDD 11, the conversion printing for the front surface SF stored in the memory 10 is performed. The data Smod is subjected to a process for correcting an error relating to the color of paper or the like as a printing medium in the double-sided printed material PP and the color related to the surface line sensor 5, and the color correction print data Scolor for the surface SF is generated to store the memory again. 10 is temporarily stored (step S24, see FIG. 6).

  Here, the error correction processing for the color as step S24 will be briefly described.

  Specifically, the error correction processing is performed by comparing each of the colors including the three primary colors and the respective intermediate colors constituting the print data Sprint for the surface SF using the error color correction table data and corresponding to only the surface SF. This is a color conversion process for converting each of the colors constituting the data Sref. That is, only the above three primary colors will be described for simplification of description. The error color correction table data includes three primary colors (red (R), green (G), and blue (B) constituting the print data Sprint for the surface SF. )) For each of the three primary colors constituting the comparison reference data Sref corresponding only to the surface SF (in the case illustrated in FIG. 6, red (R ′), green (G ′), and blue (including errors relating to the above colors)). Each of B ′) is composed of correction values for conversion. For example, when the print data Sprint for the front surface SF is 8-bit digital data, the color depth of each of the three primary colors in the print data Sprint for the front surface SF (color depth indicating each color expressed in 256 levels) is set. On the other hand, a multiplication value for converting these into the color depths of the three primary colors as the comparison reference data Sref corresponding only to the surface SF is included in the error color correction table data for each of the three primary colors as the correction value. . Thus, in the color conversion process (step S24), the corresponding multiplication value included in the error color correction table data is used for each primary color with respect to the color depth of each of the three primary colors constituting the print data Sprint for the surface SF. By multiplying every time, it is converted into the color depth of each of the three primary colors as the comparison reference data Sref corresponding only to the surface SF.

  On the other hand, when the resolution conversion process for the back surface RV (step S30) is performed, the show-through corresponding to the show-through color correction table (indicated by reference numeral “T1” in FIG. 6) stored in the HDD 11 is performed. The color correction table data is used to correct errors related to the color of the paper or the surface line sensor 5 as the print medium and the converted print data Smod for the back surface RV stored in the memory 10. A process for correcting the show-through color is performed to generate color-corrected print data Scolor for the back surface RV and temporarily store it again in the memory 10 (step S31).

Here, the show-through correction processing in step S31 is specifically the same as the color conversion processing using the error color correction table (step S24), and the three primary colors constituting the print data Sprint for the back surface RV. In this color conversion process, each of the colors including the intermediate colors is converted into each of the colors constituting the comparison reference data Sref corresponding to only the back surface RV using the show-through color correction table data. That is, only the three primary colors will be described. As the show-through color correction table data, as in the case of the error color correction table, the three primary colors (red (R) and green (G) constituting the print data Sprint for the back surface RV are used. ) And blue (B)) for the three primary colors constituting the comparison reference data Sref corresponding only to the back surface RV (in the case illustrated in FIG. 6, red (R _R ) and green (G _{R 2} ) and blue (B _R )).

  Subsequently, using the position / rotation correction table data corresponding to the position / rotation correction table (indicated by “T2” in FIG. 6) stored in the HDD 11, the back surface RV stored in the memory 10 is used. The color correction print data Scolor is subjected to a process for correcting positional deviation and rotational deviation, and corrected print data for the back surface RV is generated and temporarily stored again in the memory 10 (step S32).

  Here, the correction processing for the positional deviation and the rotational deviation as the step S32 will be briefly described.

  Specifically, the correction process is performed by using the position / rotation correction table data and the comparison reference data Sref corresponding to only the back surface SF using the position / rotation correction table data, and the shape of the print content corresponding to the color correction print data Scolor for the back surface RV. This is a shape conversion process (position shift / rotation shift conversion process) for converting into a corresponding shape.

  Then, the corrected print data subjected to the process of step S31 is reversed left and right so as to correspond to the back side (step S32), and the corrected print data after the left and right reversal is used as show-through data for printing result inspection of the front surface SF. The generated data is temporarily stored in the memory 10.

  Next, show-through data stored in the memory 10 is acquired (step S25), and the acquired show-through data is combined with the color corrected print data Scolor after the color conversion processing in step S24, and combined. Data is temporarily stored in the memory 10 (step S26, see FIG. 6).

  Next, distortion (distortion of the thickness of the line constituting the double-sided printed material PP or distortion in the horizontal / vertical direction) included in the inspection data Stest due to the use of the surface line camera 5 is corrected. Accordingly, the distortion correction table data corresponding to the distortion correction table stored in advance in the HDD 11 is used to perform the process of correcting the distortion on the synthesized data stored in the memory 10 (step S27), and the reference Data Sref is generated and output to the inspection apparatus 3 (step S28).

  Here, the distortion correction processing as step S27 will be specifically described.

  Specifically, the distortion correction processing is performed by using the distortion correction table data to determine the thickness and position of a line or the like in the symbol that constitutes the composite data, and the line or the like in the symbol that constitutes the comparison reference data Sref. This is a conversion process for converting into thickness and position.

  Completion of the processing from the above steps S20 to S34 completes the comparison reference data Sref for the front surface SF printing considering the show-through related to the contents printed on the back surface RV.

  Finally, the generated comparison reference data Sref and the inspection data Stest of the surface SF output from the surface line sensor 5 via the changeover switches 9 and 6 (step S36 and step S39) are inspected. Comparison is performed in the comparison processing unit 23 in the apparatus 3 (step S37; see FIG. 6), and the result is displayed on the display 25, for example, to notify the operator. In this case, for example, if the double-sided printed material PP corresponding to the data to be inspected Stest at that time has a missing defect point D1 or a defective stain point D2 as illustrated in FIG. 6, this is indicated on the display 25 or the like. Will be displayed.

  Next, the time flow in the case where the processing at the time of inspection described with reference to FIGS. 5 and 6 is continuously performed on a plurality of double-sided printed products PP will be described with reference to the timing chart shown in FIG. Explained.

The continuous inspection for a plurality of double-sided printed products PP is executed with the trigger signal Stg shown in FIG. 1 as a clue. That is, as illustrated in FIG. 7, the timing t ₁ when the trigger signal Stg detects that the first double-sided printed product PP has reached the imaging range of each of the front surface line sensor 5 and the rear surface line sensor 8 (FIG. 7). From the top row), imaging of both sides of the double-sided printed product PP by each line sensor and the input of the data to be inspected Stest to the inspection apparatus 3 (see the second row, lower right hatching section from the top in FIG. 7) are executed. In parallel with this, the resolution conversion process, each color conversion process, and the distortion correction process in steps S22 to S34 are executed for the print data Sprint for each side corresponding to the first double-sided printed material PP (FIG. 7). (Refer to the bottom right hatched area at the bottom). Then, the timing t _{2 at which} the rear end of the first double-sided printed product PP (the rear end in the transport direction of the double-sided printed product PP) passes through the imaging range of each of the front surface line sensor 5 and the rear surface line sensor 8 (most in FIG. 7). In the upper section), the input processing of the inspection data Stest to the inspection device 3 and the generation processing of the comparison reference data Sref from the print data Sprint for each surface and the input processing to the inspection device 3 are completed. is doing.

Then, the timing t ₂ later, as shown in FIG. 7, the inspection process by the inspection apparatus 3 according to the double-sided printed material PP of the first sheet (see step S36. The second stage from the bottom 7 the lower right hatched portion) , Generation processing of inspection data Stest corresponding to the second double-sided printed material PP (see the second-stage filled portion from the top in FIG. 7) and reference data Sref generation processing (steps S22 to S34; see bottom-most filled portion in FIG. 7) Are executed simultaneously in parallel (see timings t ₂ and t _{3 to} t _{4 in} FIG. 7).

After the timing t ₄ , as shown in FIG. 7, this time, the inspection process by the inspection device 3 relating to the second double-sided printed material PP (step S 36; see the second-stage filling portion from the bottom of FIG. 7), Processing for generating the inspected data Stest corresponding to the double-sided printed material PP (see the second lower left hatched portion from the top in FIG. 7) and the processing for generating the reference data Sref (steps S22 to S34; see the lower left lower hatched portion in FIG. 7). Are executed simultaneously in parallel (see, for example, timings t ₄ and t _{5 to} t _{6 in} FIG. 7).

  Thereafter, the continuous inspection shown in FIG. 7 is performed on each subsequent double-sided printed material PP. The series of operations described above are executed while the comparison processing unit 23 in the inspection apparatus 3 and the processing unit 13 in the reference data generation computer 1 exchange control data (not shown) with each other. .

  As described above, according to the operation of the inspection system S according to the embodiment and the example, any other surface corresponding to any one surface (for example, the surface SF) of the double-sided printed material PP that has been printed on both sides. The show-through color correction table and the position / rotation correction table relating to the show-through of the back surface (for example, the back surface RV) are stored in advance, and the comparison reference data Sref is generated using each of the stored correction tables. Since the comparison reference data Sref and the inspected data Stest corresponding to the one surface are compared and the result is output, the influence of the show-through is taken into consideration even in the case of a double-sided printed material PP that may show through. Thus, each side of the double-sided printed material PP can be inspected.

  Further, the surface line sensor 5 is printed from the front surface SF side on the printed matter obtained by printing the contents of the master chart data (for example, the rear surface master chart data) defined in advance only on the corresponding back surface RV. Each correction table is generated so as to match the contents of the master chart imaging data Scrt obtained by imaging with the master chart imaging data Scrt generated using the printed matter obtained by printing only on the back surface RV. Further, the double-sided printed material PP can be inspected quickly and more accurately by correcting the back surface master chart data and using it for inspection.

  Furthermore, since each correction table is generated for each quality of the print medium used for printing and the comparison inspection is performed for each quality, the double-sided printed material PP can be accurately inspected for each quality.

  Furthermore, the show-through color correction table is a show-through color correction table for correcting the color corresponding to the print data Sprint for the back surface RV to be the color in the master chart image data Scrt imaged from the front surface SF side. Therefore, even when the printing result on the back surface RV is seen through from the front surface SF side due to show-through, the double-sided printed material PP can be inspected accurately and quickly in consideration of this.

  Further, since the comparison reference data Sref is generated using the show-through correction table for each color related to the print result, the color related to the print result of the back surface RV can be more accurately corrected to the color from the front surface SF side. .

  Further, the position / rotation correction table is a correction table for correcting a two-dimensional error between the print data Sprint for the back surface RV and the inspection data Stest as the imaging result. Even when the printing result in the RV can be seen through from the surface SF side, the double-sided printed product PP can be inspected accurately and quickly in consideration of this.

  Furthermore, the process of correcting each print data Sprint using each correction table to generate the comparison reference data Sref is executed in parallel with the image pickup process by each line sensor, and the generated comparison reference data Sref and the image pickup Since the double-sided printed product PP is inspected by comparing with the inspected data Stest generated by the processing, it is possible to shift to the comparison processing immediately after the generation of the inspected data Stest, and there is an error due to the imaging processing in the comparison reference data Sref itself. Since the correction is made, the double-sided printed product PP can be inspected accurately and quickly.

  In addition, a common show-through color correction table T1 and position / rotation correction table T2 are used for different print data Sprint, and comparison reference data Sref is generated for each different print data Sprint. Even when the print data Sprint is different, it is possible to accurately inspect these double-sided printed products PP using the corresponding reference data Sref.

  Further, an imaging process corresponding to one print data Sprint and a process for generating comparison reference data Sref are executed in parallel, and the simultaneous parallel process is repeated for a plurality of print data Sprints to be printed continuously. Therefore, even when a plurality of print data Sprint is continuously printed, the double-sided printed material PP can be inspected continuously in a short time.

  Furthermore, since the comparison reference data Sref is generated using the show-through color correction table T1 for each primary color related to printing, the print data Sprint color can be more accurately corrected to the color of the inspection data Stest.

  In the synthesis process according to step S26 in the above-described embodiment, the show-through color corresponding to a portion (so-called non-picture portion) having a lightness equal to or lower than a preset lightness threshold in the print data Sprint for the front surface SF. It is more preferable that the comparison reference data Sref is generated by correcting the color of the print data Sprint portion using the correction table.

  In this case, it is possible to prevent an error from being included in the comparison reference data Sref due to the use of the show-through color correction table corresponding to the portion with high brightness as the print data Sprint for the front surface SF.

  In the above-described embodiments and examples, the above-described “R”, “G”, and “B” are used as the three primary colors, but C (cyan), which is a so-called primary color for printer printing, is also used. , M (magenta), Y (yellow), and K (black) may be used as primary colors to form the color correction table data.

  Further, in the above-described embodiments and examples, the show-through color correction table T1 and the error color correction table T3 are generated for each quality of the print medium such as paper used for print output. Each color correction table T1 and T3 can be generated in association with a so-called ICC profile for each quality.

  In this case, the color correction tables T1 and T3 are generated in association with the ICC profile for each quality of the print medium used for the print output, and the comparison inspection is performed for each quality. Therefore, each quality is associated with the ICC profile. It is possible to accurately inspect printed matter.

  Further, when the show-through color correction table T1 described above is used in the process of step S31, the density and the brightness are uniformly changed, for example, the density is set to 20% and the brightness is set to 110% for each color. It is also good.

  Furthermore, the programs corresponding to the flowcharts and timing charts shown in FIGS. 3 and 5 to 7 are recorded on an information recording medium such as a flexible disk or a hard disk, or acquired and recorded via the Internet or the like. In addition, by reading and executing these with a general-purpose computer, the computer can be used as the processing unit 13 and the comparison processing unit 23 according to the embodiment.

  As described above, the present invention can be used in the field of optical inspection of a double-sided printed material PP printed on both sides of a printing medium, and is printed continuously and the contents of each are mutually printed. In particular, when applied to the field of optical inspection of different double-sided printed products PP, particularly remarkable effects can be obtained.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows schematic structure etc. of the inspection system which concerns on embodiment, (a) is a figure which illustrates the surface of the double-sided printed matter which concerns on embodiment, (b) is a figure which illustrates the back surface of the said double-sided printed matter. (C) is a block diagram showing a schematic configuration and the like of the inspection system. It is a block diagram which shows the detailed structure of the inspection system which concerns on embodiment, (a) is a block diagram which shows the detailed structure of a reference | standard data generation computer, (b) is a block diagram which shows the detailed structure of an inspection apparatus. It is a flowchart which shows the production | generation process of the correction table data which concerns on embodiment. FIG. 4 is a diagram illustrating a generation process of correction table data according to the embodiment, (a) conceptually illustrating a generation process of show-through color correction table data, and (b) generating position / rotation correction table data. It is a figure which shows a process notionally. It is a flowchart which shows the test | inspection process which concerns on embodiment. It is a figure explaining the flow of the test | inspection in the test | inspection system which concerns on embodiment. It is a timing chart which shows the inspection in the inspection system concerning an embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Reference | standard data generation computer 2 Print data generation computer 3 Inspection apparatus 4 Printer 5 Front surface line sensor 6, 9 Changeover switch 7 Trigger signal generation part 7A Detector 8 Back surface line sensor 10, 20 Memory 11 HDD
12, 21 Interface unit 13, 23 Processing unit 14, 24 Operation unit 15, 25 Display S Inspection system PP Double-sided printed material SF Front surface RV Back surface T1 Back-through color correction table T2 Position / rotation correction table T3 Error color correction table D1 Missing defect point D2 dirt fault point _{t 1, t 2, t 3} , t 4, t 5, t 6 timing PT patch Sprint printing data Scmr, Scmr1, Scmr2 imaging data Stest inspection data Stg trigger signal Sref comparison reference data Scrt master chart imaging data (Backside master chart imaging data)
Shdd HDD signal Sm Memory signal Sdp Display signal Sop Operation signal Smod Conversion print data Scolor Color correction print data

Claims (10)

Inspection to inspect double-sided printed matter obtained by printing the print target information for one side of the print medium on the one side and printing the print target information for the other side of the print medium on the other side A computer included in an inspection system comprising an imaging means for optically imaging the one surface of the obtained double-sided printed matter and generating imaging information corresponding to the one surface;
Wherein a Urautsushi information corresponding to the print target information printed on the other face of the double-sided printed material includes from the one surface side in the imaging information generated by imaging a surface of the one Storage means for storing the show-through information,
Reference information generating means for correcting the print object information for the one surface based on the stored show-through information and generating reference information serving as a reference in the inspection of the one surface ;
Comparison means for comparing the previous SL imaging information generated, and the reference information corresponding to said imaging information for one surface is generated by imaging, and outputs the comparison results for the surface of the one, and ,
Print the contents of the other-surface sample print information that is specified in advance as the other-surface sample print information that is a sample of the print target information for the other surface, and print the other-surface sample print information only on the other surface. A show-through image in which the show-out information is generated and further stored in the storage means so as to match the content of the other-side sample image pickup information obtained by imaging the obtained sample printed matter from the one surface side by the image pickup means. Information generation means,
A biopsy査用program Ru to function as,
The computer functioning as the show-through information generating means generates the show-through information in association with an ICC profile for each quality of the print medium used for printing the other-surface sample print information, and stores it in the storage means. As well as
Causing the computer functioning as the storage means to function to store the generated show-by-image information for each quality;
Causing the computer functioning as the reference information generating means to function to generate the reference information for the one surface corresponding to the print target information for each of the one surface for each quality;
Further, the computer functioning as the comparison unit includes the imaging information corresponding to the print target information for each of the one surface, the reference information for the one surface corresponding to the generated imaging information, And a function for outputting the result of the comparison . The inspection program according to claim 1,
The show-through information includes an image of the double-sided printed matter in which the print target information color relating to the print target information for the other side is printed only on the other side from the one side. The show-through information generated by the computer functioning as the show-through information generating means to correct the print target information color so as to be the image pickup information color related to the image pickup information generated
Furthermore, the inspection program causing the computer functioning as the reference information generating means to function to generate the reference information by correcting the print target information based on the show-through information . The inspection program according to claim 2,
The show-through information includes, for each color used for printing on the other surface of the print target information for the other surface, the colors related to the print target information color, the image information color The show-through information generated by the computer functioning as the show-through information generating means to correct each color related to the print target information color to be each color,
The computer functioning as the reference information generating unit is configured to function to correct the print target information for each of the colors and generate the reference information based on the show-through information . program. The inspection program according to claim 1 ,
The show-through information includes the imaging information obtained by imaging the double-sided printed matter obtained by printing the print target information for the other side only on the other side from the other side, and the imaging information, The show-through information generated by the computer functioning as the show-through information generating means to correct a two-dimensional error between the print target information for the other surface,
Furthermore, the inspection program causing the computer functioning as the reference information generating means to function to generate the reference information by correcting the print target information based on the show-through information . In the inspection program according to any one of claims 1 to 4,
The computer functioning as the reference information generating unit uses the show-through information corresponding to a portion of the print target information having a lightness equal to or lower than a preset threshold lightness among the print target information for the one surface. And a function for correcting the portion and generating the reference information . In the inspection program according to any one of claims 1 to 5,
The reference information generation unit and the imaging unit are configured to execute the generation process of the reference information corresponding to the one surface in parallel with the generation processing of the imaging information corresponding to the one surface. An inspection program that further causes the computer to function as control means for controlling the control . The inspection program according to claim 6 ,
The imaging process of the one surface by the imaging unit and the generation process of the reference information corresponding to the one surface by the reference information generating unit are performed in parallel and on a plurality of the one surface An inspection program that causes the computer functioning as the control unit to function so as to be repeated for each of the plurality of pieces of print target information to be printed continuously . In the inspection program according to claim 6 or 7 ,
The show-through information is the show-through information corresponding to the image pickup processing of the double-sided printed matter by the one image pickup unit,
The inspection functioning the computer functioning as the reference information generating unit to generate the reference information corresponding to the print target information using the show-through information for each different print target information. Program. Inspection to inspect double-sided printed matter obtained by printing the print target information for one side of the print medium on the one side and printing the print target information for the other side of the print medium on the other side In the system,
An imaging means for optically imaging the one surface of the obtained double-sided printed matter and generating imaging information corresponding to the one surface;
Back-print information corresponding to the print target information printed on the other side of the double-sided printed matter, and included in the imaging information generated by imaging the one side from the one side Storage means for storing the show-through information;
Reference information generating means for correcting the print object information for the one surface based on the stored show-through information and generating reference information serving as a reference in the inspection of the one surface;
A comparison unit that compares the generated imaging information with the reference information corresponding to the imaging information generated by imaging the one surface, and outputs a comparison result for the one surface;
Print the contents of the other-surface sample print information that is specified in advance as the other-surface sample print information that is a sample of the print target information for the other surface, and print the other-surface sample print information only on the other surface. A show-through image in which the show-out information is generated and further stored in the storage means so as to match the content of the other-side sample image pickup information obtained by imaging the obtained sample printed matter from the one surface side by the image pickup means. Information generating means;
With
The show-through information generating means generates the show-through information in association with an ICC profile for each quality of the print medium used for printing the other-surface sample print information and stores it in the storage means.
The storage means stores the generated show-through information for each quality,
The reference information generation unit generates the reference information for the one surface corresponding to the print target information for the one surface for each quality,
Further, the comparison unit is configured to display, for each quality, the imaging information corresponding to the print target information for each of the one surface and the reference information for the one surface corresponding to the generated imaging information. An inspection system that compares and outputs the comparison result . Inspection to inspect double-sided printed matter obtained by printing the print target information for one side of the print medium on the one side and printing the print target information for the other side of the print medium on the other side An image pickup unit that optically images the one side of the obtained double-sided printed matter and generates imaging information corresponding to the one side, and is printed on the other side of the double-sided printed matter. Storage means for storing show-through information corresponding to the print target information, the show-through information included in the imaging information generated by imaging the one side from the one side. In an inspection method executed in an inspection system comprising:
A reference information generating step of correcting the print object information for the one surface based on the stored show-through information and generating reference information serving as a reference in the inspection of the one surface;
A comparison step of comparing the generated imaging information with the reference information corresponding to the imaging information generated by imaging the one surface, and outputting a comparison result for the one surface;
Print the contents of the other-surface sample print information that is specified in advance as the other-surface sample print information that is a sample of the print target information for the other surface, and print the other-surface sample print information only on the other surface. A show-through image in which the show-out information is generated and further stored in the storage means so as to match the content of the other-side sample image pickup information obtained by imaging the obtained sample printed matter from the one surface side by the image pickup means. Information generation process;
Including
In the show-through information generation step, the show-through information is generated in association with an ICC profile for each quality of the print medium used for printing the other-surface sample print information, and stored in the storage means.
The storage means stores the generated show-through information for each quality,
In the reference information generation step, the reference information for the one surface corresponding to the print target information for the one surface is generated for each quality,
Further, in the comparison step, the imaging information corresponding to the print target information for each of the one surface and the reference information for the one surface corresponding to the generated imaging information for each quality. inspection method characterized by comparing, outputs the comparison result to.

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