JP4079250B2 - Printed matter inspection method and apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a printed matter inspection method and apparatus for inspecting a continuously conveyed printed matter. In particular, the present invention relates to a printed matter inspection method and apparatus for capturing reference image data during inspection of a printed matter, replacing the reference image data, and continuing the inspection.
[0002]
[Prior art]
In the inspection of printed matter, a print error of the printed matter has been detected by comparing the image of the printed matter to be inspected (inspection image) with the image of the reference printed matter (reference image).
[0003]
If the inspection state becomes unstable during the inspection, the reference image is updated (re-reference → inspection).
[0004]
If it becomes unstable, the error frequency increases. However, even in a case where the error is determined, there is often no substantial difference in the printed content (typically, the pattern) as if the human eye saw it.
[0005]
As this factor, the density adjustment (ink amount adjustment) of the pattern of the printed matter is performed as if it was seen by a person. This is because there is a difference in density between the reference (shading information for each pixel) and the inspection object.
[0006]
[Problems to be solved by the invention]
Conventionally, when the reference image is updated after artificially adjusting the density, the inspection cannot be performed until a new reference is generated, and printing has not been performed.
[0007]
SUMMARY An advantage of some aspects of the invention is that it provides a printed matter inspection method and apparatus capable of continuously inspecting when a reference image is updated.
[0008]
[Means for Solving the Problems]
Examples of the solving means of the present invention are as follows.
[0009]
(1) In a printed matter inspection method for inspecting a printed matter that is being continuously conveyed, image data (D1) of the printed matter at a certain point during conveyance is acquired, and a first is obtained from the acquired image data (D1). The reference image data (S1) is created, the printed material being conveyed is inspected based on the first reference image data (S1), and then the image data (D2) of the printed material at another time point during the conveyance is obtained. The second reference image data (S2) is created from the acquired image data (D2), and the reference is made from the first reference image data (S1) to the second reference image data (S2) without interrupting the printed matter inspection. Continuously inspecting the printed material being transported by replacing the image data ,
A printed matter inspection method, wherein a printed matter being conveyed is inspected by both the first reference image data (S1) and the second reference image data (S2) when replacing the reference image.
[0010]
(2) When the inspection state based on the first reference image data becomes unstable, the generation of the second reference image data is started, and then the generated second reference image data is replaced with the first reference image data. The printed matter inspection method according to claim 1.
[0011]
(3) In a printed matter inspection apparatus for inspecting a continuously conveyed printed matter, the sensor (28) for obtaining image data (D) of the printed matter being conveyed, and acquired at a certain point during the conveyance. The first reference image data (S1) is created from the obtained image data (D1), and the second reference image data (S2) is created from the image data (D2) acquired at another time point during conveyance. a reference image data generation circuit (24), first reference image data (S1) and comparative inspection circuit for comparing the image data of the printed matter being conveyed (D) the both of the second reference image data (S2) (26) is provided,
Without interrupting the printing product inspection, between the first reference image data (S1) Ru replaced with the second reference image data (S2), image data of the printed matter being conveyed (D) is the first reference image data (S1) and print inspection apparatus characterized by being examined by both the second reference image data (S2).
[0012]
DETAILED DESCRIPTION OF THE INVENTION
In a preferred embodiment of the present invention, the printed content of the printed material being continuously conveyed, for example, the design of the roll paper is inspected. Preferably, the pattern is detected by a sensor and acquired as electronic information (image data) of the pattern. The configuration of the sensor and the method of acquiring image data by the sensor are arbitrary.
[0013]
First reference image data is created from image data of a printed matter at a certain point in time during conveyance, and second reference image data is created from image data of the printed matter at another point during conveyance. Both of these are used to inspect the printed material being conveyed.
[0014]
Preferably, the creation of the second reference image data is started when the state of the inspection based on the first reference image data becomes unstable (for example, when the error frequency becomes high). Thereafter, it is preferable to the second reference image data generated Ru replace the first reference image data.
[0015]
While replacing the first reference image data with the second reference image data, a comparative inspection using both the first reference image data and the second reference image data is performed. In this case, the replacement from the first reference image data to the second reference image data is performed without interrupting the inspection.
[0016]
By the present invention lever, without interrupting the inspection, captures the new standards, it is possible to be replaced by the new standards, the printing of non-inspection does not occur at the time of a reference update.
[0017]
【Example】
Embodiments of the present invention will be described below with reference to the drawings.
[0018]
FIG. 1 is a conceptual diagram showing an example in which a printed matter inspection apparatus according to the present invention is applied to an offset rotary printing press.
[0019]
The printed matter inspection apparatus 10 mainly includes an offset rotary printing press 12 and an inspection system 20.
[0020]
In the rotary offset printing press 12, roll paper 14 is set as a typical example of the printed matter of the present invention. The roll paper 14 is conveyed in the arrow X direction from a printing unit having a plate cylinder to a winding unit (not shown). A pattern 16 as a typical example of the image of the present invention is continuously printed on the roll paper 14 in the X direction.
[0021]
The inspection system 20 includes a main body 22, a sensor unit 28, and a display device 30.
[0022]
A sensor unit 28 is set on the surface side of the roll paper 14. The sensor unit 28 is connected to the main body 22 and is used for acquiring information (image data) of the pattern 16 on the roll paper 14. Although any sensor unit 28 can be used, it is sufficient that a light receiving unit for obtaining image data is provided.
[0023]
The main body 22 has a function of operating the entire apparatus to process inspection contents and a function of a display unit for displaying the operation contents.
[0024]
A display device 30 is connected to the main body 22. The display device 30 is for displaying image comparison results, error warnings, and the like.
[0025]
FIG. 2 conceptually shows the internal configuration of the main body 22 and the data flow.
[0026]
The main body 22 is provided with a control unit 23, a reference image data creation circuit 24, a reference image memory 25, and a comparison inspection circuit 26.
[0027]
Control unit 23, the reference image data generating circuit 24, a reference image memory 25, and is connected to the comparison check circuit 26 is used to control them.
[0028]
The reference image data creation circuit 24 is connected to the sensor unit 28. The reference image data creation circuit 24 is transmitted with the image data D of the printed material being conveyed obtained by the sensor unit 28. The reference image data creation circuit 24 creates image data (reference image data S) that serves as a reference for comparison.
[0029]
The reference image memory 25 is connected to the reference image data creation circuit 24. The reference image data S created by the reference image data creation circuit 24 is transmitted to the reference image memory 25. The reference image memory 25 stores reference image data S. In FIG. 2, the reference image memory 25 is provided with a bank 1 and a bank 2 for storing two reference image data S. First reference image data S1 and second reference image data S2 (shown as reference image 1 and reference image 2 in the figure) are stored in bank 1 and bank 2, respectively.
[0030]
The comparison inspection circuit 26 is connected to the reference image memory 25. The comparison inspection circuit 26 performs comparison inspection of the image data D using the reference image data S stored in the reference image memory 25. The comparison inspection circuit 26 compares the first reference image data S1 and the second reference image data S2 with the image data D.
[0031]
The comparison result between the first reference image data S1 and the second reference image data S2 and the image data D is transmitted to the display device.
[0032]
Hereinafter, an example of a printed matter inspection procedure according to the present invention will be described.
[0033]
First, the image data D1 of the printed matter at the initial time point during conveyance is acquired by the sensor unit 28. The image data D1 is transmitted to the reference image data creation circuit 24.
The reference image data creation circuit 24 creates the first reference image data S1 from the image data D1. The first reference image data S1 is preferably created from a plurality of image data D1 because the data is averaged, but may be created from a single image data D1. The created first reference image data S1 is transmitted to the reference image memory 25 and stored in the bank 1. The comparison inspection circuit 26 compares the first reference image data S1 with the image data D of the printed material being conveyed. The comparison result is displayed on the display device 30.
[0034]
Next, when the state of the inspection based on the first reference image data S1 becomes unstable during conveyance (when the error frequency is high, but there is no difference in the design as seen by the person), the sensor The acquisition of the image data D2 of the printed matter at that time by the unit 28 is started. The start of acquisition of the image data D2 is preferably controlled by the control unit 23. For example, the update button on the control unit 23 (not shown) provided, but it is preferable to be initiated by pressing the update button may be automatic.
[0035]
The image data D2 is transmitted to the reference image data creation circuit 24 and the comparison inspection circuit 26. The reference image data creation circuit 24 creates the second reference image data S2 from the image data D2. The second reference image data S2 is preferably created from a plurality of image data D2 because the data is averaged, but may be created from a single image data D2. When creating the second reference image data S2, the first reference image data S1 is transferred to the bank 2. For example, the first reference image data S1 is transferred to the bank 2 at the same time as or after the creation of the second reference image data S2. New second reference image data S2 is stored in bank 1, and old first reference image data S1 is stored in bank 2.
[0036]
The image data D2 transmitted to the comparison inspection circuit 26 is subjected to a comparison inspection using the first reference image data S1 stored in the bank 2. That is, while the second reference image data S2 is created from the image data D2, the image data D2 is comparatively inspected by the first reference image data S1. Therefore, the inspection is not interrupted during the creation of the reference image data.
[0037]
The created second reference image data S2 is transmitted to the reference image memory 25 and stored in the bank 1. After the creation of the second reference image data S2, the comparison inspection circuit 26 performs a comparison inspection with the image data D of the printed material being conveyed using both the first reference image data S1 and the second reference image data S2. It is preferable to inspect both the first reference image data S1 and the second reference image data S2 for a certain period of time.
[0038]
After inspecting both the first reference image data S1 and the second reference image data S2 for a predetermined time, the image data D of the printed material being conveyed is comparatively inspected using only the second reference image data S2. Thus, the first reference image data S1 is smoothly replaced with the second reference image data S2. The comparison result using the second reference image data S2 is displayed on the display device 30.
[0039]
Acquires a print image data in yet another time during transport, by creating a first and reference image data of the second non, after replacing the first reference image data to the second reference image data, further the The second reference image data can be replaced with the next reference image data (for example, third reference image data). As a result, a large number of reference image data can be sequentially replaced. In this way, new reference image data is created over a long period of time, so that comparison inspection is continuously performed.
[0040]
【The invention's effect】
According to the present invention, the reference image data at different time points can be replaced, and the printed matter can be continuously inspected. Therefore, it is possible to prevent the printed matter from being uninspected when the reference is updated.
[0041]
Further, while replacing the first reference image data to the second reference image data, Runode compare inspected using both the first reference image data and the second reference image data, the second reference image from the first reference image data Data can be replaced smoothly.
[0042]
Note that the present invention is not limited to the illustrated embodiment. The configuration of the memory and circuit is arbitrary.
[0043]
The printed matter to be inspected and the shape of the image are also arbitrary, and may be an image or the like arranged in a plurality of rows.
[Brief description of the drawings]
FIG. 1 is a conceptual diagram showing an example of a printed matter inspection apparatus suitably used in the present invention.
FIG. 2 is a conceptual diagram showing an example of the internal configuration of the main body and the flow of data.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Print inspection apparatus 12 Offset rotary printing machine 14 Roll paper 16 Picture 20 Inspection system 22 Main body 23 Control part 24 Reference | standard image data creation circuit 25 Reference | standard image memory 26 Comparison inspection circuit 28 Sensor part 30 Display apparatus

Claims (3)

In a printed matter inspection method for inspecting a printed matter being continuously conveyed, image data (D1) of the printed matter at a certain point during conveyance is obtained, and first reference image data is obtained from the obtained image data (D1). (S1) is created, the printed material being conveyed is inspected based on the first reference image data (S1), and thereafter, the image data (D2) of the printed material at another time point during the conveyance is acquired and acquired. The second reference image data (S2) is created from the processed image data (D2), and the reference image data is transferred from the first reference image data (S1) to the second reference image data (S2) without interrupting the printed matter inspection. By inspecting the printed material being continuously conveyed by replacing it ,
A printed matter inspection method, wherein a printed matter being conveyed is inspected by both the first reference image data (S1) and the second reference image data (S2) when replacing the reference image. When the inspection state by the first reference image data becomes unstable, creation of the second reference image data is started, and then the created second reference image data is replaced with the first reference image data. The printed matter inspection method according to claim 1. In a printed matter inspection apparatus for inspecting a printed matter being continuously conveyed, a sensor (28) for obtaining image data (D) of the printed matter being conveyed, and image data obtained at a certain point during conveyance A reference image for generating first reference image data (S1) from (D1) and generating second reference image data (S2) from image data (D2) acquired at another time during conveyance a data generating circuit (24), first reference image data (S1) and comparative inspection circuit for comparing the image data of the printed matter being conveyed (D) the both of the second reference image data (S2) (26) Is provided,
Without interrupting the printing product inspection, between the first reference image data (S1) Ru replaced with the second reference image data (S2), image data of the printed matter being conveyed (D) is the first reference image data (S1) and print inspection apparatus characterized by being examined by both the second reference image data (S2).

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