JP5521365B2 - Performance evaluation sheet for printed material inspection equipment - Google Patents

Description

  The present invention relates to a performance evaluation sheet for a printed matter inspection apparatus for evaluating or calibrating the inspection performance of a printed matter inspection apparatus that inspects defects in a printed matter.

  When manufacturing a printed matter, the printing method includes letterpress, screen, offset, or gravure. There are also types of printing machines such as sheet-fed and rotary, depending on the transport method of the printed matter. Examples of the printing raw material include not only paper but also a transparent plastic film and a composite material by vapor deposition. Here, a gravure rotary printing press is given as an example.

  In a gravure rotary printing press, a web-like material is conveyed and printed. Defects may occur during the printing process. A printed matter inspection apparatus is used to detect this defect and determine the quality of the printed matter.

  The printed matter inspection apparatus is often used by being attached to a printing press so that when a defect occurs, the quality can be determined immediately. The reason for this is to incorporate the printed matter inspection apparatus into the printing process by the printing machine, thereby reducing the total number of processes and producing efficiently. An imaging means such as a line sensor camera included in the printed matter inspection apparatus is installed in the printing machine, images of printed matter or characters are imaged, and inspection is performed based on the image data.

  For example, the printing plate data or the original document data before it can be obtained by converting the original document data such as the PDF format into the printing plate data in the format of the international standard in the printing process called JDF in the pre-printing process. A method of performing a quality inspection by comparing these printing plate data or previous document data with appropriate inspection data obtained by reading a printed matter with a scanner and free from scratches or dirt is known ( Patent Document 1).

  As described above, there is a method for inspecting a printed matter, but there are the following problems. Printed products have different quality conditions for each product. Therefore, the printed matter inspection apparatus needs to set an index for determining which range should be defective and an inspection level for each printed matter to be inspected.

  The higher the inspection level, the more rigorous inspection, and the lower the index, the more ambiguous inspection. It is difficult to set the inspection level appropriately. The reason is shown below. If the inspection level is too low, a defect to be detected is missed. Moreover, if the inspection level is excessively high, acceptable defects are detected, and the good / bad determination is not accurate. Therefore, in order to determine the inspection level, it is important to quantitatively evaluate the defect detection performance of the inspection apparatus.

  However, since there is no standard for defect detection performance evaluation, the maximum detection performance of the printed product inspection device or the detection performance corresponding to the situation due to the change of the detection parameter of the printed product inspection device is quantitative. I don't know.

  Therefore, evaluation was performed by creating a printed sample as a reference each time and inspecting the sample. Therefore, since the inspection level is adjusted by trial and error based on an empirical rule, there is a problem that calibration of the printed material inspection apparatus takes time and labor, and there is a possibility that the calibration is not correctly performed.

JP 2007-152700 A

  The objective of this invention is providing the performance evaluation sheet | seat of the printed matter inspection apparatus which can evaluate the performance of a printed matter inspection apparatus quantitatively irrespective of the model difference and individual difference of a printed matter inspection apparatus.

The performance evaluation sheet of the printed matter inspection apparatus according to the invention of claim 1 captures the inspection image while conveying the printed matter in a predetermined conveyance direction, compares the reference image with the inspection image, and obtains a difference to obtain the difference between the printed matter. A performance evaluation sheet for a printed matter inspection apparatus in which a pattern or a character is printed on one or both sides by a plate cylinder in order to quantitatively evaluate or calibrate the performance of a printed matter inspection apparatus for inspecting defects, wherein the reference image is An image of the printed matter taken before the current inspection image, and a reference portion having a first reference region on which a pattern or a character serving as a reference for performance evaluation is printed, and to correspond to the reference portion An abnormal portion having a second reference region on which the same pattern or character is printed as the first reference region, and a defect print region on which a pseudo defect is applied, and the reference portion And the abnormal part The reference portion by equally dividing the circumference length in the conveying direction, by being printed by the plate cylinder arranged in the order of the abnormal portion, the reference portion are arranged in the transport direction in the order of the abnormal portion, it It is characterized by.

The performance evaluation sheet of the printed matter inspection apparatus according to a second aspect of the invention is the invention according to the first aspect, wherein a plurality and the same number of the reference portions and the abnormal portions are provided, and the plurality of reference portions are in the transport direction. The plurality of abnormal portions are arranged in the transport direction with respect to the plurality of reference portions.

  The performance evaluation sheet of the printed matter inspection apparatus according to the invention of claim 3 is the invention according to any one of claims 1 and 2, wherein the defective print area has ink jumping, omission, unevenness, and attachment in a printing process. It is characterized by being given a pseudo defect that displays a kimono or a flaw.

  According to the present invention, a reference part having a first reference area on which a pattern or a character serving as a reference for performance evaluation is printed, and the first reference area are arranged so as to correspond to the reference part. Or an abnormal part having a second reference area on which characters are printed and a defect print area on which a pseudo defect is applied, so that a printed matter inspection can be performed regardless of the model difference or individual difference of the printed matter inspection apparatus. The performance of the device can be quantitatively evaluated.

  For this reason, according to the present invention, it is possible to perform inspection with a constant inspection level for a certain printed matter even in separate printed matter inspection apparatuses, and it is possible to calibrate installation errors and performance deterioration of the printed matter inspection apparatus.

  Further, according to the present invention, it is possible to make a quantitative evaluation index for a long period of time by creating a performance evaluation sheet with a plate. This is because if there is a plate cylinder on which a pattern of a performance evaluation sheet that is an evaluation standard is created, the same performance evaluation sheet can be created any number of times by attaching the plate cylinder to a printing machine and printing. This is because if the data to be engraved is saved, the same plate cylinder can be created any number of times.

It is the schematic which shows the printing machine and printed matter inspection apparatus which evaluate or calibrate the inspection performance by the performance evaluation sheet | seat which concerns on Embodiment 1 of this invention. It is a figure for demonstrating the relationship between the plate cylinder of a printing machine, and plate cylinder circumference. It is a figure which shows the continuity of the pattern of the general web-like printed matter of the gravure printing of a printing machine. It is a figure which shows one example of the structure of the pattern of a normal printed matter. FIG. 5 is a diagram for explaining a relationship between a plate cylinder of a printing press and a plate cylinder circumference when printing the normal printed matter of FIG. 4. It is a figure which shows one example of the pattern of the performance evaluation sheet | seat which concerns on Embodiment 1 of this invention. It is a figure for demonstrating the relationship between the plate cylinder in the case of printing the performance evaluation sheet | seat which concerns on Embodiment 1 of this invention shown in FIG. 6, and a plate cylinder circumference. It is a figure which shows the other example of the performance evaluation sheet | seat which concerns on Embodiment 1 of this invention. It is a figure which shows the further another example of the performance evaluation sheet | seat which concerns on Embodiment 1 of this invention. It is a flowchart for demonstrating the operation | movement of the defect detection of the printed matter inspection apparatus using the performance evaluation sheet | seat which concerns on Embodiment 1 of this invention.

Next, embodiments of the present invention will be described in detail with reference to the drawings.
(Embodiment 1)
FIG. 1 is a schematic diagram illustrating a printing machine and a printed matter inspection apparatus that evaluates or calibrates inspection performance using a performance evaluation sheet according to Embodiment 1 of the present invention. The following Embodiment 1 is not intended to limit the application of the present invention or its use.

  As shown in FIG. 1, the printing machine 10 includes an original fabric attachment roller 11, a plate cylinder 12, two transport rollers 13 and 14, and an original fabric take-up roller 15. The printed matter inspection apparatus 20 includes an illumination unit 21, an imaging unit 22, and a control / image processing unit 23.

  An original fabric 30 is wound around the original fabric attachment roller 11. The plate cylinder 12 is used to create a performance evaluation sheet 31 by printing a pattern, a character, and a pseudo defect on an original 30 fed from the original attachment roller 11. The performance evaluation sheet 31 is conveyed by rotating the plate cylinder 12, the conveying rollers 13 and 14, and the original fabric winding roller 15 in a predetermined direction at a predetermined speed. The conveyance rollers 13 and 14 guide and convey the performance evaluation sheet 31. The raw fabric take-up roller 15 takes up the performance evaluation sheet 31.

  An illumination unit 21 and an imaging unit 22 are disposed between the two transport rollers 13 and 14. The illumination means 21 illuminates one side or both sides of the performance evaluation sheet 31, that is, illuminates the front surface, back surface, or both surfaces. The imaging means 22 captures the surface of the performance evaluation sheet 31 in synchronization with the conveyance speed of the performance evaluation sheet 31 and generates image data. The reason that the imaging unit 22 performs imaging in synchronization with the conveyance speed of the performance evaluation sheet 31 is to perform imaging that is not affected even when the conveyance speed of the performance evaluation sheet 31 varies. The control / image processing means 23 is connected to the imaging means 22. The control / image processing unit 23 detects and determines a pseudo defect of the performance evaluation sheet 31 using the image data from the imaging unit 22.

  FIG. 2 is a diagram for explaining the relationship between the plate cylinder and the plate cylinder circumference of the printing press. FIG. 3 is a diagram showing the continuity of the pattern of a general web-like printed matter of gravure printing by a printing press. In the gravure printing, the web-like printed matter 40 is created by the plate cylinder 12. Ink is placed on the groove of the engraved plate cylinder, the ink is transferred to the original, and a pattern is continuously formed on the web-like printed matter 40 for each peripheral length of the plate cylinder 12.

  Utilizing this continuity, the printed matter inspection apparatus normally divides the inspection image photographed by the imaging means into units of the circumference of the plate cylinder 12, compares the reference image with the inspection image, and takes the difference. Then, the defect is detected. The inspection method can be classified into an absolute reference method and a relative reference method according to the difference in the reference image. The absolute reference method is a method in which an image captured in advance or one image data prepared in advance is always compared as a reference image with all inspection images. The relative reference method is a method in which an image taken before the current inspection image is compared with the inspection image as a reference image. In this method, the reference image and the inspection image change every time. In the first embodiment of the present invention, the printing press 10 performs an inspection by a relative reference method. This is because, by using the relative reference method, it is possible to reduce the deviation of the captured image due to the meandering of the conveyance and the expansion and contraction of the target object.

  FIG. 4 is a diagram illustrating an example of a pattern configuration of a normal printed matter 50. FIG. 5 is a diagram for explaining the relationship between the plate cylinder 51 of the printing press and the plate cylinder circumference when the normal printed matter 50 of FIG. 4 is printed. FIG. 6 is a diagram illustrating an example of a pattern of the performance evaluation sheet 31 according to Embodiment 1 of the present invention. FIG. 7 is a diagram for explaining the relationship between the plate cylinder 12 and the plate cylinder perimeter when the performance evaluation sheet 31 according to Embodiment 1 of the present invention shown in FIG. 6 is printed.

  In the performance evaluation sheet 31 according to Embodiment 1 of the present invention, a pattern or a character is printed on one side or both sides in order to quantitatively evaluate or calibrate the performance of the printed product inspection apparatus 20 that inspects a printed product for defects. This is a performance evaluation sheet 31 of the printed matter inspection apparatus 20. The performance evaluation sheet 31 according to the first embodiment of the present invention is arranged so as to correspond to the reference portion 311 having a first reference region on which a pattern or a character serving as a reference for performance evaluation is printed, and the reference portion 311. The first reference area includes an abnormal portion 312 having a second reference area on which the same pattern or character is printed and a defect print area on which a pseudo defect is applied.

  As described above, the relative reference type defect inspection is performed by dividing the image captured by the imaging unit 22 into units of the plate cylinder circumference and sequentially capturing images based on the previously captured images. In many cases, the defect is detected by comparing and taking the difference. This is because there is a high possibility that the difference between the image data on the inspection apparatus side and the document data is large, and if the correction or the like that allows this difference is performed, the detection power decreases. Further, since the portion printed in one cycle of the plate is the same image unless there is a defect, this time, the plate cylinder is equally divided in the transport direction and arranged with the reference portion 311 and the abnormal portion 312. As a result, it is possible to extract a pseudo defect image 320 by taking a difference from the imaging result of the reference portion 311 and the imaging result of the abnormal portion 312. FIG. 6 shows an example in which the plate cylinder 12 is divided into two equal parts, but if there is at least one reference part 311 in front of the abnormal part 312, the plate cylinder 12 may be divided into three or more parts.

  FIG. 8 is a diagram showing another example of the performance evaluation sheet according to Embodiment 1 of the present invention. The performance evaluation sheet 31 according to Embodiment 1 of the present invention includes a reference part 51 and an abnormal part 52. The reference unit 51 includes a first reference region 511 on which a pattern or a character that serves as a reference for performance evaluation is printed. Specifically, the reference unit 511 is printed with patterns, barcodes, and characters that are actually considered as products. The abnormal part 52 is arranged so as to correspond to the reference part 51, and the first reference area 511 and the second reference area 521 on which the same pattern or character is printed and the defect print area 522 on which a pseudo defect is applied. And have.

  The defect print area 522 of the abnormal portion of the performance evaluation sheet according to Embodiment 1 of the present invention is provided with a pseudo defect that displays ink jumping, omission, unevenness, adhered matter, or scratches in the printing process. is there.

  Defects in the printing process include ink splashing, omission, unevenness, deposits and scratches. In order to imitate these and quantitatively measure the performance of the inspection machine, pseudo defects whose height, width, shape, orientation, and density are determined are displayed in the defect print area 522 according to various sizes. It has been subjected. The reference portion 51 and the abnormal portion 52 of the performance evaluation sheet 31 according to Embodiment 1 of the present invention are arranged in the order of the conveyance direction.

  FIG. 9 is a diagram showing still another example of the performance evaluation sheet according to Embodiment 1 of the present invention. As shown in FIG. 9, the performance evaluation sheet 31 according to Embodiment 1 of the present invention includes a plurality of reference parts 61, 62, 63, 64 and a plurality of abnormal parts 65, 66, 67, 68. doing. The plurality of reference portions 61, 62, 63, 64 have a plurality of first reference regions 611, 621, 631, 641 on which a pattern or a character serving as a reference for performance evaluation is printed. The plurality of abnormal parts 65, 66, 67, 68 are arranged so as to correspond to the reference parts 61, 62, 63, 64. The plurality of abnormal portions 65, 66, 67, 68 include a plurality of second reference areas 651, 661, 671, 681 printed with the same pattern or character on the first reference areas 611, 621, 631, 641; A plurality of defect print areas 652, 662, 672, and 682 which have been subjected to pseudo defects.

  In the example shown in FIG. 9, the performance evaluation sheet 31 according to Embodiment 1 of the present invention includes a plurality of reference portions 61, 62, 63, 64 and abnormal portions arranged in a direction orthogonal to the conveyance direction of the printed material. 65, 66, 67, 68. The reference parts 61, 62, 63, 64 and the abnormal parts 65, 66, 67, 68 are formed so as to correspond in the conveyance direction of the printed matter.

  By arranging the bases 61, 62, 63, and 64 with different base colors and patterns in various combinations, various verifications can be performed simultaneously. As an example, the reference portions 61, 62, 63, and 64 include light in the case of black (black) in addition to the three primary colors of indigo (cyan), red (magenta), and yellow (yellow). In addition to the three primary colors of red, red, green, and blue, white can be applied. The abnormal parts 65, 66, 67, 68 are arranged in such a way that the same color scheme as the reference parts 61, 62, 63, 64 is arranged vertically on the rear side in the transport direction, and a pseudo defect is added. To do. In this example, the abnormal portions 65, 66, 67, and 68 are applied so that the base colors are indigo (cyan), red (magenta), yellow (yellow), and black (black). Any color and arrangement may be used as long as a pseudo defect can be detected.

  FIG. 10 is a flowchart for explaining the defect detection operation of printed matter inspection apparatus 20 using the performance evaluation sheet according to Embodiment 1 of the present invention. This time, a method of detecting a defect while attaching a web-shaped original fabric 30 to the printing machine 20 and printing it is shown. In addition, even when printing on a material cut to an appropriate size like a sheet-fed machine, or when inspecting using a pre-printed performance evaluation sheet 31 like a rewinding machine, there is a defect. Detection is possible.

  In the sheet-fed press, unlike the case of the rotary press described above, the print target is cut. However, the performance evaluation sheet 31 is obtained by printing the cut material. An evaluation can be made as well. A rewinding machine is a machine that is used to adjust the strength and distortion of a roll of raw material, or to divide a single web into a plurality of webs. By attaching the printed matter inspection machine 20 to the rewinding machine, the performance evaluation sheet 31 is not inspected while being printed, but the performance evaluation sheet 31 printed in advance is used to perform the performance of the printed matter inspection apparatus other than the printer 10. Can be evaluated.

  Next, the performance evaluation or calibration operation of the printed matter inspection apparatus that inspects the printed matter for defects using the performance evaluation sheet according to Embodiment 1 of the present invention will be described.

  In step S1, the original fabric 12 is placed on the original fabric attachment roller 11 of the printing machine 10, and a pattern as shown in FIG. Next, in step S <b> 2, a plate pattern (pattern in FIG. 9) is printed on the original fabric 30 by the plate cylinder 12, and a performance evaluation sheet 31 is created.

  Next, the performance evaluation sheet 31 is imaged by the imaging means 22 in S3. Next, in step S4, the image data of the reference portion and the image data of the abnormal portion of the performance evaluation sheet 31 are extracted. Next, in step S <b> 5, the control / image processing unit 23 takes the difference between the image data of the reference portion and the image data of the abnormal portion, thereby detecting a pseudo defect in the abnormal portion of the performance evaluation sheet 31. When this defect detection is performed on the entire performance evaluation sheet 31, the defect detection process of the printed matter inspection apparatus 20 ends (step S6).

  The performance of the printed matter inspection apparatus 20 can be evaluated depending on to what size and density the pseudo defects can be extracted. In the same way, it is also possible to quantitatively compare the performance of each printed matter inspection apparatus by evaluating the performance of other printed matter inspection apparatuses using a performance evaluation sheet.

  From the above, in the first embodiment of the present invention, it is possible to inspect a certain printed matter with a constant inspection level even in separate printed matter inspection apparatuses. Furthermore, in the first embodiment of the present invention, it is possible to calibrate installation errors and performance deterioration of the printed matter inspection apparatus.

DESCRIPTION OF SYMBOLS 10 Printing machine 11 Anti-attachment roller 12 Plate cylinder 13, 14 Conveyance roller 15 Original fabric winding roller 20 Printed material inspection apparatus 21 Illumination means 22 Imaging means 23 Control / image processing means 30 Original fabric 31 Performance evaluation sheet 311, 51, 61, 62, 63, 64 Reference part 312, 52, 65, 66, 67, 68 Abnormal part 511, 611, 621, 631, 641 First reference area 521, 651, 661, 671, 681 Second reference area 522, 652, 662, 672, 682 Defective print area

Claims (3)

Quantitative evaluation or calibration of the performance of a printed product inspection apparatus that inspects a defect of the printed product by capturing an inspection image while conveying the printed product in a predetermined conveyance direction, and comparing the reference image and the inspection image to obtain a difference. a performance evaluation sheet of the printed matter inspection device pattern or character is to print on one or both sides by the plate cylinder in order to carry out the,
The reference image is an image of the printed matter taken before the current inspection image,
A reference portion having a first reference area on which a pattern or a character serving as a reference for performance evaluation is printed;
An abnormal part that is arranged so as to correspond to the reference part, and has a second reference area on which the same pattern or character is printed as the first reference area, and a defect print area on which a pseudo defect is applied; Comprising
The reference portion and the abnormal portion are printed in a plate cylinder arranged in the order of the reference portion and the abnormal portion by equally dividing the circumference in the transport direction, thereby the reference portion and the abnormal portion in the order. Arranged in the transport direction,
A performance evaluation sheet for a printed matter inspection apparatus. A plurality and the same number of the reference part and the abnormal part,
The plurality of reference portions are arranged in a direction orthogonal to the transport direction,
The plurality of abnormal portions are arranged in the transport direction with respect to the plurality of reference portions.
The performance evaluation sheet for printed matter inspection apparatus according to claim 1, comprising:   3. The defect printing area according to claim 1, wherein the defect printing area is provided with a pseudo defect that displays ink jumping, omission, unevenness, adhered matter, or scratches in a printing process. The performance evaluation sheet of the printed matter inspection apparatus according to 1.

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