CN110875996B - Printing overprinting monitoring system and monitoring method thereof - Google Patents
Printing overprinting monitoring system and monitoring method thereof Download PDFInfo
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- CN110875996B CN110875996B CN202010050103.4A CN202010050103A CN110875996B CN 110875996 B CN110875996 B CN 110875996B CN 202010050103 A CN202010050103 A CN 202010050103A CN 110875996 B CN110875996 B CN 110875996B
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Abstract
The application provides a printing overprint monitoring system and a monitoring method thereof, wherein the monitoring method comprises the following steps: acquiring standard position image data of printing paper reaching an overprinting station; monitoring whether the printing paper reaches the overprinting station or not, if so, sending a signal that the printing paper reaches the overprinting station, and if not, continuing monitoring, wherein an identification symbol is preset at the edge of the printing paper; responding to a signal that the printing paper reaches the overprinting station, and acquiring image data of the identification symbol on the printing paper; transmitting the acquired image data of the identification symbol and the standard position image data to a display for comparison, and calculating an overprint deviation value; and judging whether the overprint deviation value is within the qualified threshold range, if so, not needing to be corrected, and if not, executing a correction process. Whether this application detects to have the overprinting deviation before the overprinting, in time revises the overprinting deviation, reduces the rejection rate, improves printing quality.
Description
Technical Field
The application relates to the technical field of printing, in particular to a printing overprinting monitoring system and a monitoring method thereof.
Background
At present, the image technology of the figure is continuously developed, make its advantage in the aspect of printing quality detection obtain extensive attention, adopt the image processing technology to carry on the overprint deviation detection on line and have advantages such as high accuracy high efficiency, in the in-process of lottery ticket printing, accurate overprint is very important, in the polychrome overprint process of reality, because the influence of various uncertain factors, certain deviation can appear in each printing roller position, each printing module can not be according to given process synchronous operation, lead to the overprint to produce the deviation, there is the clearance between the different patterns, the colour mismatches, ghost image or leave white appear in the pattern, because the existence of overprint error, lead to the product quality can't guarantee, waste raw and other materials. In addition, in the printing process, overprint errors are generated due to various factors such as poor motion balance, tension fluctuation and thermal deformation of printing materials, and if the overprint errors cannot be corrected in time, the printing quality is seriously affected.
There is known a technique of using image data of a printed matter as reference data, using image data obtained by reading the printed matter by a reading sensor as inspection data, and comparing the reference data and the inspection data with each other to inspect a printing state. Or recognizes the inspection data by optical characters and converts the inspection data into character codes and compares the character codes with digital data of an original as reference data to inspect the printed contents.
However, in the prior art, the wrong conversion of characters is caused in the data processing process, the content of the image data is wrong, the printing condition cannot be accurately reflected, in addition, the image data is collected after printing to be used as the inspection data, the waste of toner, ink and paper is also caused, and the page with the printing error needs to be printed again, so that the operation efficiency is low.
Disclosure of Invention
The monitoring method detects whether overprint deviation exists before overprinting, corrects the overprint deviation in time, reduces rejection rate and improves printing quality.
To achieve the above object, the present application provides a monitoring method of a printing overprint monitoring system, the method comprising: acquiring standard position image data of printing paper reaching an overprinting station; monitoring whether the printing paper reaches the overprinting station or not, if so, sending a signal that the printing paper reaches the overprinting station, and if not, continuing monitoring, wherein an identification symbol is preset at the edge of the printing paper; responding to a signal that the printing paper reaches the overprinting station, and acquiring image data of the identification symbol on the printing paper; transmitting the acquired image data of the identification symbol and the standard position image data to a display for comparison, and calculating an overprint deviation value; judging whether the overprint deviation value is within the qualified threshold range, if so, not needing to be corrected, and if not, executing a correction process; after the correction process is performed, the image data of the identification symbol is newly acquired, and the newly acquired image data of the identification symbol and the standard position image data are displayed on the display.
As above, wherein, the calculation formula of the overprint deviation value is as follows:
wherein L represents the overprint offset value,
the abscissa of each pixel in the image representing the logo,
presentation standardThe abscissa of each pixel point in the image,
the ordinate of each pixel in the image representing the logo,
the ordinate of each pixel point in the standard image is represented, wherein,i=1，2,3，...，n；nthe number of pixel points in the image of the identifier.
The monitoring method of the printing overprint monitoring system as described above, wherein the monitoring method further comprises calculating a similarity value between the acquired image of the identification symbol and a standard image in the standard position image data, and determining a degree of error between the position of the image of the identification symbol and the position of the standard.
As above, wherein the similarity value calculation formula is:
wherein F represents a similarity value of the image of the collected identification symbol and a standard image in the standard position image data;
the abscissa of each pixel in the image representing the logo,
the abscissa representing each pixel point in the standard image,
the ordinate of each pixel in the image representing the logo,
the ordinate of each pixel point in the standard image is represented, wherein,i=1,2,3，...，n；nfor identifying the images of the symbolsThe number of middle pixel points;
error factors representing pixel points of the logo image and pixel points of the standard image.
The above, wherein error factors of pixel points of the logo image and pixel points of the standard image in the standard position image data are identified
The calculation formula of (2) is as follows:
as above, wherein the correction process comprises the steps of: inputting the overprint deviation value into a problem search model which is constructed in advance to obtain the reason for generating the overprint deviation; and correcting the overprint deviations according to the obtained reasons for generating the overprint deviations.
As above, wherein the method of the pre-constructed problem search model comprises the following steps: constructing items of a problem search model; setting a search threshold value of each item; configuring a weight for each item; setting the search priority of each item; the search threshold for each item is optimized.
As above, wherein the calculation formula of the weight is: wj=Kjthe/N is as follows; wjRepresents the weight of the jth item, KjRepresents the number of occurrences of the jth item; n represents the total number of samples.
The present application further provides a printing overprint monitoring system, comprising: the positioning monitoring module is used for monitoring whether the printing paper reaches the overprinting station, if so, sending a signal that the printing paper reaches the overprinting station, and if not, continuing to monitor; the identifier setting module is used for setting an identifier at the edge of the printing paper in advance; the image acquisition device is used for responding to a signal that the printing paper reaches the overprinting station and acquiring an image of the identification symbol on the printing paper; the data processing module is used for calculating an overprint deviation value according to the acquired image of the identifier; and the judging module is used for judging whether the overprint deviation value is within the qualified threshold range, if so, the correction is not needed, and if not, the correction process is executed.
As above, wherein the printing overprint monitoring system further comprises: the model construction module is used for constructing a problem search model in advance; and the acquisition module is used for inputting the overprint deviation value into a pre-constructed problem search model to obtain the reason for generating the overprint deviation.
The beneficial effect that this application realized is as follows:
(1) the position of printing paper is judged before each color sequence overprinting, and the overprinting deviation value which is possibly generated is calculated, so that the overprinting device is corrected before the overprinting, the overprinting deviation value is corrected within the range of qualified threshold values, and the rejection rate is reduced.
(2) The problem search model is established in advance, the overprinting deviation value obtained through calculation is sent into the problem search model, and the reason generated by the overprinting deviation value can be output, so that the overprinting deviation reason can be found quickly, overprinting deviation is corrected, and overprinting efficiency is improved.
(3) This application is gathering the in-process of sign symbol image, sets for the location monitoring devices, when the location monitoring devices detects printing paper and arrives the printing station, initiatively sends the image acquisition signal to image acquisition device to automated control image acquisition device gathers the image of sign symbol.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art according to the drawings.
Fig. 1 is a flowchart of a monitoring method of a printing overprint monitoring system according to an embodiment of the present application.
Fig. 2 is a flowchart of a modification process according to an embodiment of the present application.
Fig. 3 is a flowchart of a method for constructing a problem search model in advance according to an embodiment of the present application.
Fig. 4 is a schematic structural diagram of a printing overprint monitoring system according to an embodiment of the present application.
Reference numerals: 10-positioning a monitoring module; 11-an acquisition unit; 20-identifier setting module; 30-an image acquisition device; 40-a data processing module; 50-a judgment module; 60-a model building module; 70-deviation cause obtaining module; 80-a correction module; 90-a display; 91-a control center; 92-an alarm module; 100-print overprint monitoring system.
Detailed Description
The technical solutions in the embodiments of the present application are clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Example one
As shown in fig. 1, the present application provides a monitoring method of a printing overprint monitoring system, the monitoring method including:
step S1, acquiring the standard position image data of the printing paper arriving at the overprinting station.
And step S2, monitoring whether the printing paper reaches the overprinting station, if so, sending a signal that the printing paper reaches the overprinting station, and if not, continuing monitoring, wherein an identification symbol is set at the edge of the printing paper in advance.
Specifically, an identification symbol is set at one or both side edges of the printing paper.
In the process of printing multicolor on the printing paper, the identifier is used for positioning the position of the printing paper, the position of the printing paper can be judged by detecting the position of the identifier, after the printing of the first color sequence is finished, the printing paper is conveyed to the second color sequence printing station, before the printing of the second color sequence, whether the position of the identifier is at the standard position is judged, if so, the printing of the second color sequence is executed, otherwise, the printing of the second color sequence is not executed, the printing quality is improved, and the printing rejection rate is reduced.
Wherein, the identification symbol is a simple figure, for example: triangular, square, circular or other simple figures.
And step S3, responding to the signal that the printing paper arrives at the overprinting station, and acquiring the image of the identifier on the printing paper.
Specifically, after the positioning monitoring device detects that the printing paper reaches the overprinting station, a signal that the printing paper reaches the overprinting station is sent to the image acquisition device, and the image acquisition device receives the signal that the printing paper reaches the overprinting station and starts to acquire the image of the identification symbol in response to the signal that the printing paper reaches the overprinting station.
After the printing paper reaches the overprinting station, an image acquisition device is adopted to acquire an image of the identification symbol above the identification symbol; and after the image acquisition device acquires the image of the identifier, transmitting the image of the identifier to an image processor for image processing and analysis.
Each overprinting process is correspondingly provided with a positioning monitoring device and an image acquisition device.
Step S4 compares the acquired image data of the identification symbol with the standard position image data, and calculates an overprint bias value.
And calculating the similarity value of the acquired image of the identifier and a standard image in the standard position image data, and judging the error degree between the position of the image of the identifier and the standard position.
After receiving the image of the identification symbol, the image processor positions the central point of the image of the identification symbol, and places the image of the identification symbol into a coordinate system where a standard image is located by taking the central point as a coordinate original point, namely, the acquired image of the identification symbol and the standard image are established in the same coordinate system, wherein the center of the standard image is the original point of coordinates, the image of the identification symbol is not inclined or rotated in the process of being placed into the coordinate system, and the shape and the size of the standard image are the same as those of the image of the identification symbol.
Defining the coordinates of each pixel point in the standard image asHi=（X Hi ,Y Hi ) The coordinates of each pixel point of the image of the logo areBi=(X Bi ,Y Bi );i=1，2,3，...，n；nThe number of pixel points in the image of the identifier.
The similarity value F is calculated as follows:
where F denotes a similarity value of the image of the acquired identification symbol and a standard image in the standard position image data. Wherein,
；
error factors representing pixel points of the logo image and pixel points of the standard image.
The size of the similarity value reflects the position accuracy of the printing paper, the larger the similarity value is, the closer the position of the printing paper is to the standard position is, the smaller the deviation of the final printed pattern is, and the phenomenon of double images or white marks is not easy to appear on the overprinted image.
The overprint offset value is calculated as follows:
wherein L represents the overprint offset value,
the abscissa of each pixel in the image representing the logo,
representing individual images in a standard imageThe abscissa of the pixel point is the axis of the pixel,
the ordinate of each pixel in the image representing the logo,
the ordinate of each pixel point in the standard image is represented, wherein,i=1，2,3，...，n；nthe number of pixel points in the image of the identifier.
The overprint offset value reflects the offset generated between the printed patterns with two different colors in the process of printing different color sequences, and if the overprint offset value exceeds a certain range, double images or white spots can be seen by naked eyes of people, so that the product is unqualified.
And step S5, judging whether the overprint deviation value is within the qualified threshold range, if so, not needing to be corrected, and if not, executing correction operation.
If the overprint deviation value is detected to exceed the qualified threshold range, a signal that the overprint deviation exceeds the qualified threshold range is sent to a control center, the control center controls the printing equipment to stop printing, an alarm prompt signal that the overprint deviation value exceeds the qualified threshold range is sent to an alarm device, the alarm device sends an alarm signal after receiving the alarm prompt signal, and the allowed tolerance value of overprint is generally made according to the visual observation force of people, and under normal observation conditions, the ability of human eyes to distinguish fine lines can reach 0.10mm, so the allowed tolerance of overprint is determined to be 0.10mm, namely 0.10mm is taken as the standard of overprint precision, but for wet-on-wet multi-color overprint, the allowed overprint error must be equal to or less than 0.03 mm. In the application, the qualified threshold range of the overprint deviation is set to be within the range of 0.05-0.10 mm.
After the correction process is performed, the image data of the identification symbol is newly acquired, and the newly acquired image data of the identification symbol and the standard position image data are displayed on the display.
As shown in fig. 2, the correction process includes the following steps:
and step T1, inputting the overprint deviation value into a problem search model which is constructed in advance, obtaining the reason for generating the overprint deviation, and displaying the overprint deviation value and the reason for generating the overprint deviation on a display screen so as to be conveniently checked by a worker.
As shown in fig. 3, the method of constructing the problem search model in advance is as follows:
and step T110, constructing items of the problem search model.
Specifically, a plurality of samples with overprint deviation values not within a qualified threshold range are obtained, and each overprint deviation value corresponds to different common causes for overprint deviation; samples with the same reason are classified as one item.
Among them, the reasons include deformation of the printing plate, deformation of the paper, misalignment of the paper feed teeth, and insufficient nip force of the impression cylinder.
In step T120, a search threshold is set for each item.
Specifically, corresponding abnormal overprint deviation values in the items are removed; and taking the minimum value of the residual normal overprint deviation value as the minimum value of the threshold value, and taking the maximum value of the residual normal overprint deviation value as the maximum value of the threshold value.
Step T130, a weight is configured for each item.
Wherein, the weight calculation formula is as follows:
Wj=Kj/N;
wherein; wjRepresents the weight of the jth item, KjRepresents the number of occurrences of the jth item; n represents the total number of samples.
In step T140, the search priority for each item is set.
Specifically, the search priorities of the items are set in descending order of weight, that is, the search priority is higher when the weight is higher.
And if so, judging that the reason corresponding to the item is the reason for generating the overprint deviation, and otherwise, introducing the item with the next priority for judgment.
And step T150, optimizing the search threshold of each item.
Checking whether the search threshold values of all the items have breakpoints, namely checking whether an interval exists between the threshold values of some two items, and if not, not carrying out other operations; if yes, optimizing the threshold values corresponding to the two items, specifically, the method for optimizing the threshold values corresponding to the two items is as follows:
the value of the calculation interval, a = Min2-Max1, where Max1 represents the maximum value of the first project threshold and Min2 represents the minimum value of the second project, defines: the maximum value of the second item is greater than the maximum value of the first item;
and adding A/2 to the maximum value of the first item, and subtracting A/2 from the minimum value of the second item to form a new item threshold value, thereby obtaining the search threshold value of the optimized item.
Inputting the overprint offset value into a problem search model, firstly comparing the overprint offset value with a threshold value of an item with a prior priority, if the overprint offset value is within the threshold value range, preliminarily judging that the cause of the overprint offset is the cause corresponding to the item, correcting the overprint offset according to the cause, otherwise, comparing the overprint offset with the threshold value corresponding to the item of the next level, judging whether the overprint offset is the cause corresponding to the next item, judging the cause of the overprint offset according to the method, if the cause of the overprint offset is not judged, manually checking the cause of the overprint offset, and adding the overprint offset into the problem search model as a new item.
And step T2, correcting the overprint deviations according to the acquired causes for generating the overprint deviations.
For example, if it is detected that the cause of the overprint deviation is a deviation in the position of the printing plate roller, the phase adjustment amount of the printing plate roller is calculated, and the deviation correcting device adjusts the phase of the printing plate roller according to the calculated phase adjustment amount of the printing plate roller, thereby correcting the overprint deviation so that the overprint deviation value reaches the pass threshold range.
Specifically, the amount of adjustment required in the transverse direction of the printing plate roller is the deviation amount of the identifier in the horizontal direction, and the deviation amount of the identifier in the horizontal direction is the average value of the difference values between the abscissa of each pixel point of the image of the identifier and the abscissa of each pixel point of the standard image; the amount of adjustment needed in the longitudinal direction of the printing plate roller is the deviation amount of the longitudinal direction of the identification symbol, and the deviation amount of the longitudinal direction of the identification symbol is the average value of the difference values between the vertical coordinates of each pixel point of the image representing the symbol and each pixel point of the standard image.
And after each correction is complete, executing a calculation step of overprint deviation once, feeding back a calculation result to the judgment module, judging whether the overprint deviation is within a qualified threshold value range or not by the judgment module according to the calculation result, if so, finishing the correction of the overprint deviation, and otherwise, continuing to execute the overprint deviation correction step.
According to an embodiment of the invention, after the correction is completed, the overprint deviations are checked continuously until the overprint deviations are within a qualified threshold range, and the correction is stopped.
According to a specific embodiment of the invention, after one correction is completed, the overprint deviation is calculated, whether the magnitude of the overprint deviation is obviously reduced or not is judged, if yes, the correction mode is correct, and if the overprint deviation is not obviously reduced after one correction is completed, the correction mode is not correct, so that the reason for generating the overprint deviation needs to be searched again, and the correction is carried out according to the reasons corresponding to the items of the previous stage and the next stage of the item to which the overprint deviation belongs, which are originally judged, until the overprint deviation is obviously reduced, so that the correction mode is correct.
According to one embodiment of the invention, the temperature and humidity in the printing work environment are monitored in real time, whether the detected temperature and humidity exceed the preset reasonable temperature and humidity range is judged, if yes, the temperature and humidity of the environment are regulated by using a temperature regulator and a humidity regulator, and if not, the temperature and humidity of the environment are continuously monitored.
According to other embodiments of the invention, color mark marks are set at the edge positions of a printed matter, a photoelectric scanning head is set at a printing station, and color mark signals of two adjacent colors are captured by the photoelectric scanning head;
capturing color code signals by a photoelectric scanning head; and storing the time and the number of each color code signal. After two photoelectric eyes of the photoelectric scanning head scan overprint color codes, pulse signals are generated, two paths of digital signals are output, and the digital signals are connected to a data processor after being shaped and amplified.
Wherein, the calculation formula of the overprint deviation L is as follows:
L=3.14(J/P)*(t2-t1);
where J represents the diameter of the printing plate roller, P represents the resolution of the photoelectric encoder, t1 represents the time to capture the first color set trigger, and t2 represents the time to capture the second color set trigger. If t1 equals t2, it indicates that no overprint bias is present.
In the calibration process, a plurality of calibration points are displayed on a screen of the display, and the calibration points are respectively positioned on the same straight line along the length direction of the identification symbol.
Example two
As shown in fig. 4, a print overprint monitoring system 100 includes:
and the acquisition unit 11 is used for acquiring the standard position image data of the printing paper arriving at the overprinting station.
And the positioning monitoring module 10 is used for monitoring whether the printing paper reaches the overprinting station, if so, sending a signal that the printing paper reaches the overprinting station, and if not, continuing to monitor.
And an identifier setting module 20 for setting an identifier in advance at an edge of the printing paper.
And the image acquisition device 30 is used for responding to a signal that the printing paper arrives at the overprinting station and acquiring an image of the identification symbol on the printing paper.
The data processing unit 40 acquires the image data of the identification symbol and the standard position image data, compares the acquired image data of the identification symbol and the standard position image data, and calculates an overprint offset value. And also for calculating a similarity value of the image of the identification symbol with a pre-stored standard image.
And a judging module 50, configured to judge whether the overprint deviation value is within a qualified threshold range, if so, no correction is needed, and if not, a signal that the overprint deviation value exceeds the qualified threshold range is sent to the control center 91, and a correction process is executed.
And when the control center 91 receives the signal that the overprint deviation value exceeds the qualified threshold range, the printing is stopped, and an alarm prompt signal is sent to the alarm module 92.
And the alarm module 92 is used for sending out an alarm signal.
And a model building module 60, configured to build the problem search model in advance.
And a deviation reason obtaining module 70, configured to input the overprint deviation value into a pre-constructed problem search model, and obtain a reason for generating the overprint deviation.
The model construction module 60 includes a project construction unit for constructing projects of the problem search model; a search threshold setting unit for setting a search threshold for each item; the weight configuration unit is used for configuring weights for each item of the problem search model; a priority setting unit for setting a search priority for each item; and the search threshold optimizing unit is used for optimizing the search threshold of each item.
And a correction module 80 for correcting the overprint deviations according to the obtained cause of the overprint deviations and executing a correction operation.
The control center 91, the data processing module 40 transmits the overprinting deviation amount to the control center 91, the control center 91 calculates the phase adjustment amount of the printing plate roller according to the overprinting deviation amount, and transmits the adjustment signal to the deviation rectifying mechanism for driving the printing plate roller to rotate, the deviation rectifying mechanism adjusts the phase of the printing plate roller according to the control signal given by the control center, eliminates the overprinting deviation, and finishes the deviation rectifying, and the deviation rectifying mechanism is a servo motor. And the deviation rectifying mechanisms are correspondingly arranged at the two adjacent color group units.
The photoelectric encoder is arranged on the main shaft of the printing plate roller and used for synchronously triggering the image acquisition device to acquire the image of the identification symbol.
And a display 90 for displaying the overprint deviation value and the cause of the overprint deviation.
The system is characterized in that: omnibearing, distributed, good printing quality, high response speed and high precision.
The beneficial effect that this application realized is as follows:
(1) the position of printing paper is judged before each color sequence overprinting, and the overprinting deviation value which is possibly generated is calculated, so that the overprinting device is corrected before the overprinting, the overprinting deviation value is corrected within the range of qualified threshold values, and the rejection rate is reduced.
(2) The problem search model is established in advance, the overprinting deviation value obtained through calculation is sent into the problem search model, and the reason generated by the overprinting deviation value can be output, so that the overprinting deviation reason can be found quickly, overprinting deviation is corrected, and overprinting efficiency is improved.
(3) This application is gathering the in-process of sign symbol image, sets for the location monitoring devices, when the location monitoring devices detects printing paper and arrives the printing station, initiatively sends the image acquisition signal to image acquisition device to automated control image acquisition device gathers the image of sign symbol.
While one embodiment of the present invention has been described in detail, the description is only a preferred embodiment of the present invention and should not be taken as limiting the scope of the invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.
Claims (8)
1. A method of monitoring a print overprint monitoring system, the method comprising:
acquiring standard position image data of printing paper reaching an overprinting station;
monitoring whether the printing paper reaches the overprinting station or not, if so, sending a signal that the printing paper reaches the overprinting station, and if not, continuing monitoring, wherein an identification symbol is preset at the edge of the printing paper;
responding to a signal that the printing paper reaches the overprinting station, and acquiring image data of the identification symbol on the printing paper;
transmitting the acquired image data of the identification symbol and the standard position image data to a display for comparison, and calculating an overprint deviation value;
judging whether the overprint deviation value is within the qualified threshold range, if so, not needing to be corrected, and if not, executing a correction process;
after the correction process is executed, acquiring the image data of the identifier again, and displaying the newly acquired image data of the identifier and the standard position image data on the display;
calculating the similarity value of the acquired image of the identifier and a standard image in the standard position image data, and judging the error degree between the position of the image of the identifier and the standard position;
the similarity value calculation formula is as follows:
wherein,
the abscissa of each pixel in the image representing the logo,
the abscissa representing each pixel point in the standard image,
the ordinate of each pixel in the image representing the logo,
the ordinate of each pixel point in the standard image is represented, wherein,i=1,2,3，...，n；nthe number of pixel points in the image of the identifier;
pixel points and criteria representing a logo imageError factors for pixel points of the image.
2. A method of monitoring a printing overprint monitoring system as claimed in claim 1, wherein the overprint offset value is calculated by the formula:
wherein L represents the overprint offset value,
the abscissa of each pixel in the image representing the logo,
the abscissa representing each pixel point in the standard image,
the ordinate of each pixel in the image representing the logo,
the ordinate of each pixel point in the standard image is represented, wherein,i=1，2,3，...，n；nthe number of pixel points in the image of the identifier.
3. The monitoring method of a printing overprint monitoring system according to claim 1, characterized in that error factors of pixel points of the logo image and pixel points of the standard image in the standard position image data
The calculation formula of (2) is as follows:
4. a monitoring method of a printing overprint monitoring system according to claim 1, characterized in that the correction process comprises the steps of:
inputting the overprint deviation value into a problem search model which is constructed in advance to obtain the reason for generating the overprint deviation;
and correcting the overprint deviations according to the obtained reasons for generating the overprint deviations.
5. A monitoring method of a printing overprint monitoring system according to claim 4, characterized in that the method of pre-building a problem search model comprises the steps of:
constructing items of a problem search model;
setting a search threshold value of each item;
configuring a weight for each item;
setting the search priority of each item;
the search threshold for each item is optimized.
6. A monitoring method of a printing overprint monitoring system according to claim 5, characterized in that the weight is calculated by the formula: wj=Kj/N；
Wherein; wjRepresents the weight of the jth item, KjRepresents the number of occurrences of the jth item; n represents the total number of samples.
7. A print overprint monitoring system, comprising:
the acquiring unit is used for acquiring the image data of the standard position of the printing paper reaching the overprinting station;
the positioning monitoring module is used for monitoring whether the printing paper reaches the overprinting station, if so, sending a signal that the printing paper reaches the overprinting station, and if not, continuing to monitor;
the identifier setting module is used for setting an identifier at the edge of the printing paper in advance;
the image acquisition device is used for responding to a signal that the printing paper reaches the overprinting station and acquiring an image of the identification symbol on the printing paper;
the data processing unit is used for acquiring the image data of the identifier and the image data of the standard position, comparing the acquired image data of the identifier with the image data of the standard position and calculating the overprint deviation value;
calculating the similarity value of the acquired image of the identifier and a standard image in the standard position image data, and judging the error degree between the position of the image of the identifier and the standard position;
the similarity value calculation formula is as follows:
wherein,
the abscissa of each pixel in the image representing the logo,
the abscissa representing each pixel point in the standard image,
the ordinate of each pixel in the image representing the logo,
the ordinate of each pixel point in the standard image is represented, wherein,i=1,2,3，...，n；nthe number of pixel points in the image of the identifier;
error factors representing pixel points of the logo image and pixel points of the standard image;
and the judging module is used for judging whether the overprint deviation value is within the qualified threshold range, if so, the correction is not needed, and if not, the correction process is executed.
8. The print overprint monitoring system of claim 7, further comprising:
the model construction module is used for constructing a problem search model in advance;
and the deviation reason acquisition module is used for inputting the overprint deviation value into a pre-constructed problem search model to acquire the reason for generating the overprint deviation.
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| CN112406342B (en) * | 2020-11-17 | 2022-09-16 | 武汉虹之彩包装印刷有限公司 | Control method for precise positioning of platinum relief printing |
| CN112712502B (en) * | 2020-12-29 | 2024-04-19 | 凌云光技术股份有限公司 | Method for correlating front and back synchronization detection results |
| CN113580763B (en) * | 2021-07-22 | 2023-04-07 | 江阴市欧莱特彩印有限公司 | Control method, system and equipment for output parameters of printing semi-finished products in printing workshop |
| CN114386448B (en) * | 2021-12-28 | 2024-09-27 | 易唯思智能自动化装备无锡有限公司 | Online identification method and online identification system for DOT codes of tires |
| CN114312004B (en) * | 2022-03-07 | 2022-06-17 | 中体彩印务技术有限公司 | Lottery printing quality monitoring method and system |
| CN114474986B (en) * | 2022-04-08 | 2022-06-17 | 中体彩印务技术有限公司 | Overprinting error detection and evaluation method and system |
| CN115346286B (en) * | 2022-07-01 | 2024-01-09 | 中体彩印务技术有限公司 | Paper processing monitoring method and system |
| CN117934470B (en) * | 2024-03-22 | 2024-09-10 | 宁德时代新能源科技股份有限公司 | Model training method, defect detection device, model training equipment and storage medium |
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