CN113043723A - Screen frame nesting method - Google Patents
Screen frame nesting method Download PDFInfo
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- CN113043723A CN113043723A CN202110326359.8A CN202110326359A CN113043723A CN 113043723 A CN113043723 A CN 113043723A CN 202110326359 A CN202110326359 A CN 202110326359A CN 113043723 A CN113043723 A CN 113043723A
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- pattern
- mark
- determining
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- mark pattern
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F15/00—Screen printers
- B41F15/14—Details
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F33/00—Indicating, counting, warning, control or safety devices
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/0002—Inspection of images, e.g. flaw detection
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/20—Special algorithmic details
- G06T2207/20092—Interactive image processing based on input by user
- G06T2207/20104—Interactive definition of region of interest [ROI]
Abstract
The invention provides a screen frame registration method, which is applied to the position alignment registration of screen frames of a plurality of printing devices and comprises the following steps: generating marking patterns on the printing bedplate in a one-to-one correspondence manner through a printing device; acquiring a detection image with the mark pattern; determining a position of the marker pattern in the inspection image; selecting one of the mark patterns as a reference pattern, and determining the offset distance of other mark patterns relative to the reference pattern; and correspondingly adjusting the position of the screen frame of the printing device according to each offset distance. The screen frame nesting method of the invention can automatically adjust the screen frame position by simultaneously printing the mark patterns on the plurality of printing devices, then sequentially acquiring the images with the mark patterns and determining the offset positions of the mark patterns, accurately and quickly determining whether each printing device is aligned with the position, and can detect in real time in the printing process to reduce the generation of waste products.
Description
Technical Field
The invention relates to the technical field of printing, in particular to a screen frame nesting method.
Background
Screen printers, also known as calico printing machines, elliptical calico printing machines, print patterns on printed materials such as cloth, paper, and the like. Can realize high-precision and large-batch printing of two-dimensional patterns, and has the characteristics of no wiredrawing, no pigment leakage, no glue leakage and no edge explosion. In the production link of the printing machine, the printing screen frame needs to be replaced every time when the printed patterns are replaced, and the alignment and registration adjustment precision of the screen frame greatly influences the quality of the printing machine.
The counterpoint of prior art with the screen frame is registered and needs the manual work to adjust the position of screen frame according to the observation, because the precision of manual regulation is poor and inefficiency, greatly reduced production efficiency, produced a large amount of waste products.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a screen frame nesting method.
One embodiment of the present invention provides a frame registration method, which is applied to perform registration for positions of frames of a plurality of printing apparatuses, and includes:
generating marking patterns on the printing bedplate in a one-to-one correspondence manner through a printing device;
acquiring a detection image with the mark pattern;
determining a position of the marker pattern in the inspection image;
selecting one of the mark patterns as a reference pattern, and determining the offset distance of other mark patterns relative to the reference pattern;
and correspondingly adjusting the position of the screen frame of the printing device according to each offset distance.
Compared with the prior art, the screen frame nesting method has the advantages that the marking patterns are printed on the plurality of printing devices simultaneously, then the images with the marking patterns are sequentially obtained, after the offset positions of the marking patterns are determined, the screen frame positions can be automatically adjusted, whether the printing devices are aligned with the positions or not can be accurately and quickly confirmed, real-time detection can be performed in the printing process, and waste products are reduced.
Further, the acquiring the detection image with the mark pattern includes:
and acquiring a detection image with the mark pattern, converting the detection image into a gray image, and extracting the mark pattern in the detection image.
Further, the determining the position of the marker pattern in the inspection image comprises:
extracting the mark pattern in the detection image to obtain the center coordinate of the mark pattern in the detection image;
the determining offset distances of the other of the marker patterns with respect to the reference pattern comprises:
determining offset distances of the center coordinates of the other mark patterns from the center coordinates of the reference pattern.
Further, the converting the detection image into a grayscale image includes:
and performing linear transformation processing on the detection image, and converting the detection image into a gray image.
Further, the processing method of the linear transformation comprises histogram equalization, laplacian, Log transformation or gamma transformation.
Further, the extracting the mark pattern in the inspection image, and obtaining the center coordinates of the mark pattern in the inspection image includes:
extracting the marker pattern in the detection image through a Blob algorithm to obtain coarse positioning coordinates of the marker pattern in the detection image;
positioning the mark pattern according to the rough positioning coordinates, and forming a rectangular area image externally connecting the mark pattern in the detection image as an ROI area image;
and carrying out template matching algorithm processing on the ROI area image, and determining the central coordinates of the mark pattern in the detection image.
Further, the generating of the mark patterns on the printing platen in a one-to-one correspondence by the printing device includes:
generating marking patterns on the printing bedplate in a one-to-one correspondence manner through a printing device, wherein the marking patterns generated by different printing devices are different;
the determining the position of the marker pattern in the detection image comprises:
and determining the position of the mark pattern in the detection image, and determining the printing device corresponding to the mark pattern according to different parts of the mark pattern.
Further, the different portions of the marker pattern comprise different shapes of the marker pattern.
Further, the shape of the mark pattern includes one or more of a combination of a shape of a number, a shape of a two-dimensional code, and a shape of a geometric figure.
Further, the determining the position of the mark pattern in the detection image and the printing device corresponding to the mark pattern according to different parts of the mark pattern comprises:
and determining the position of the mark pattern in the detection image according to the position identification part of the mark pattern, and determining the printing device corresponding to the mark pattern according to the number identification part of the mark pattern, wherein the number identification part corresponding to different mark patterns is different.
In order that the invention may be more clearly understood, specific embodiments thereof will be described hereinafter with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic diagram of a plurality of printing platens and a pattern of indicia in accordance with one embodiment of the present invention;
fig. 2 is a schematic view of a printing platen and a marking pattern according to another embodiment of the present invention.
Description of reference numerals:
10. a printing platen; 20. marking a pattern; 21. a number identification part; 22. a position identification part.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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 invention.
Referring to fig. 1, which is a schematic structural diagram of a plurality of printing platens and a mark pattern according to an embodiment of the present invention, a frame alignment method according to an embodiment of the present invention is applied to align positions of frames of a plurality of printing devices, and includes:
producing the marking patterns 20 on the printing platens 10 in a one-to-one correspondence by the printing devices such that each printing device corresponds to one marking pattern 20 on one printing platen 10; acquiring a detection image with the marker pattern 20; determining the position of the marker pattern 20 in the inspection image; selecting one of the mark patterns 20 as a reference pattern, and determining the offset distance of the other mark patterns 20 relative to the reference pattern; and correspondingly adjusting the position of the screen frame of the printing device according to each offset distance. Because the mark patterns 20 are printed on the printing bedplate plates 10 correspondingly, the mark patterns 20 can have enough size, which is beneficial to accurate identification of a camera, and the condition that the alignment precision is poor due to the fact that the identification range needs to be expanded when a plurality of mark patterns are printed on the same printing bedplate plate is avoided.
When the screen frame of the elliptical printing machine is aligned and registered, the printing heads of all printing devices needing to be aligned generate the mark patterns 20 on the printing table plates 10 through the screen frame, so that each printing device corresponds to one mark pattern 20 on one printing table plate 10, then each printing table plate 10 is sequentially arranged under an image acquisition device, the image acquisition device sequentially acquires images with the mark patterns 20, and the positions of the mark patterns 20 in the detected images are determined; then selecting one of the mark patterns 20 as a reference pattern, and determining the offset distance of other mark patterns 20 relative to the reference pattern; the fine adjustment device adjusts the position of the screen frame of the printing device according to the offset distance, so that the patterns printed by the screen frame of each printing device can be aligned with the position and do not offset when in subsequent printing, wherein the fine adjustment device can adjust the position of the screen frame in the direction X, Y. In order to improve the adjustment speed, after all the printing devices complete printing simultaneously, the first collected mark pattern 20 is used as a reference pattern, so that the subsequent images can be collected and the images can be processed and the screen frame can be adjusted while the detected images are collected, and the whole registration time is shortened.
In some alternative embodiments, the acquiring the detection image with the marker pattern 20 includes: the detection image with the mark pattern 20 is obtained, the detection image is converted into a gray image, the mark pattern 20 in the detection image is extracted, and the color detection image is converted into an RGB image and then is converted into a single-channel gray image of an S channel, so that subsequent image processing is facilitated.
In some alternative embodiments, the determining the position of the marker pattern 20 in the inspection image comprises: the marker pattern 20 in the inspection image is extracted, and the center coordinates of the marker pattern 20 in the inspection image are obtained. The determining the offset distance of the other marker patterns 20 from the reference pattern comprises: the offset distance of the center coordinates of the other of the marker patterns 20 from the center coordinates of the reference pattern is determined.
In some optional embodiments, the converting the detection image into a grayscale image includes: and performing linear transformation processing on the detection image, and converting the detection image into a gray image. The processing method of the linear transformation comprises histogram equalization, Laplace operator, logarithm Log transformation or gamma transformation.
Further, the extracting the marker pattern 20 in the inspection image, and obtaining the center coordinates of the marker pattern 20 in the inspection image includes: extracting the marker pattern 20 in the detection image by a Blob algorithm, obtaining rough positioning coordinates of the marker pattern 20 in the detection image, thereby roughly determining the position of the marker pattern 20, then positioning the marker pattern 20 according to the rough positioning coordinates, forming a rectangular region image which is externally connected with the marker pattern 20 in the detection image as an ROI region image, performing template matching algorithm processing on the ROI region image, determining the central coordinates of the marker pattern 20 in the detection image, and reducing the region where the marker pattern 20 is located by Blob algorithm processing, thereby being beneficial to improving the processing speed of the template matching algorithm, wherein the template image adopted in the template matching algorithm can be created in advance.
In some alternative embodiments, said generating the marking pattern 20 on the printing platen 10 by the printing device in a one-to-one correspondence comprises: the marking patterns 20 are generated on the printing platen 10 in a one-to-one correspondence through the printing devices, and the marking patterns 20 generated by different printing devices are different, so that the identification of which marking pattern 20 corresponds to which printing device is facilitated, and particularly, the identification effect is better when the elliptical printing machine has more printing devices and only uses a few of the printing devices. Of course, since the elliptical printer is an elliptical guide, the printing platen 10 is moved in sequence after the printing device prints, and it is possible to determine which printing device the mark pattern 20 corresponds to based on the sequence of acquiring the detection images. The determining the position of the marker pattern 20 in the inspection image comprises: the position of the marker pattern 20 in the inspection image is determined and the printing means corresponding to the marker pattern 20 is determined from the different parts of the marker pattern 20. For the different position comparison of the mark pattern 20, the center point position or the circumscribed frame position of the mark pattern 20 may be compared.
In some alternative embodiments, different portions of the marking pattern 20 include different shapes of the marking pattern 20, and different shapes of the marking pattern 20 also include different arrangements of patterns, such as arrangements of dots. Preferably, the shape of the mark pattern 20 includes one or more combinations of a number shape, a two-dimensional code shape and a geometric figure shape, for example, the mark pattern 20 corresponds to different printing devices through 1, 2, 3, etc. of numbers; alternatively, a square, heart, star, circle, triangle, etc. in the geometric figure corresponds to each printing device.
In some optional embodiments, the printing device determining the position of the marker pattern 20 in the detection image and determining the marker pattern 20 corresponding to different parts of the marker pattern 20 comprises: the position of the marker pattern 20 in the detection image is determined by the position indicator 22 of the marker pattern 20, and the printing device corresponding to the marker pattern 20 is determined by the number identifier of the number indicator 21 of the marker pattern 20, wherein the number indicator 21 corresponding to different marker patterns 20 is different, and the position indicators 22 may be the same or different. Referring to fig. 2, which is a schematic structural diagram of a printing platen and a mark pattern according to another embodiment of the present invention, in this embodiment, the number marks 21 of different mark patterns 20 are different numbers, and the position marks 22 of different mark patterns 20 are all ring-shaped surrounding the number marks 21.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. A screen frame registration method is applied to the position registration of screen frames of a plurality of printing devices, and is characterized by comprising the following steps:
generating marking patterns on the printing bedplate in a one-to-one correspondence manner through a printing device;
acquiring a detection image with the mark pattern;
determining a position of the marker pattern in the inspection image;
selecting one of the mark patterns as a reference pattern, and determining the offset distance of other mark patterns relative to the reference pattern;
and correspondingly adjusting the position of the screen frame of the printing device according to each offset distance.
2. The frame registering method according to claim 1, wherein the acquiring the detection image with the mark pattern comprises:
and acquiring a detection image with the mark pattern, converting the detection image into a gray image, and extracting the mark pattern in the detection image.
3. The frame registering method according to claim 2, wherein the determining the position of the mark pattern in the inspection image comprises:
extracting the mark pattern in the detection image to obtain the center coordinate of the mark pattern in the detection image;
the determining offset distances of the other of the marker patterns with respect to the reference pattern comprises:
determining offset distances of the center coordinates of the other mark patterns from the center coordinates of the reference pattern.
4. The frame registering method according to claim 2, wherein the converting the detected image into a gray image comprises:
and performing linear transformation processing on the detection image, and converting the detection image into a gray image.
5. The frame nesting method according to claim 4, wherein: the processing method of the linear transformation comprises histogram equalization, Laplace operator, logarithm Log transformation or gamma transformation.
6. The frame registering method according to claim 2, wherein the extracting the mark pattern in the inspection image and obtaining the center coordinates of the mark pattern in the inspection image comprises:
extracting the marker pattern in the detection image through a Blob algorithm to obtain coarse positioning coordinates of the marker pattern in the detection image;
positioning the mark pattern according to the rough positioning coordinates, and forming a rectangular area image externally connecting the mark pattern in the detection image as an ROI area image;
and carrying out template matching algorithm processing on the ROI area image, and determining the central coordinates of the mark pattern in the detection image.
7. The frame nesting method according to any one of claims 1 to 6, wherein said creating a pattern of marks on the printing platen in a one-to-one correspondence by the printing device comprises:
generating marking patterns on the printing bedplate in a one-to-one correspondence manner through a printing device, wherein the marking patterns generated by different printing devices are different;
the determining the position of the marker pattern in the detection image comprises:
and determining the position of the mark pattern in the detection image, and determining the printing device corresponding to the mark pattern according to different parts of the mark pattern.
8. The frame nesting method according to claim 7, wherein: different portions of the marking pattern include different shapes of the marking pattern.
9. The frame nesting method according to claim 8, wherein: the shape of the mark pattern comprises one or more combination of the shape of a number, the shape of a two-dimensional code and the shape of a geometric figure.
10. The frame registering method according to claim 7, wherein the determining the position of the mark pattern in the inspection image and the determining the printing device corresponding to the mark pattern according to different parts of the mark pattern comprises:
and determining the position of the mark pattern in the detection image according to the position identification part of the mark pattern, and determining the printing device corresponding to the mark pattern according to the number identification part of the mark pattern, wherein the number identification part corresponding to different mark patterns is different.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110326359.8A CN113043723A (en) | 2021-03-26 | 2021-03-26 | Screen frame nesting method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110326359.8A CN113043723A (en) | 2021-03-26 | 2021-03-26 | Screen frame nesting method |
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| CN113043723A true CN113043723A (en) | 2021-06-29 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5056430A (en) * | 1987-03-26 | 1991-10-15 | Koening & Bauer Aktingesellschaft | Method of positioning plate cylinders in a multi-color rotary printing machine |
| JP2002063581A (en) * | 2000-08-23 | 2002-02-28 | Nippon Telegr & Teleph Corp <Ntt> | Method for detecting rotation angle of image and method for correcting rotation angle |
| JP2007212939A (en) * | 2006-02-13 | 2007-08-23 | Hitachi High-Technologies Corp | Inspection method of positional deviation, program and inspection device of positional deviation |
| EP3246160A1 (en) * | 2016-05-19 | 2017-11-22 | KBA-NotaSys SA | Measuring and correcting print-to-print register of a multicolour print formed on printed material |
| WO2019031207A1 (en) * | 2017-08-10 | 2019-02-14 | マイクロ・テック株式会社 | Screen printing device and screen printing method |
| CN111532014A (en) * | 2020-05-08 | 2020-08-14 | 深圳诚拓数码设备有限公司 | Automatic nesting printing machine and automatic nesting method |
-
2021
- 2021-03-26 CN CN202110326359.8A patent/CN113043723A/en not_active Withdrawn
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5056430A (en) * | 1987-03-26 | 1991-10-15 | Koening & Bauer Aktingesellschaft | Method of positioning plate cylinders in a multi-color rotary printing machine |
| JP2002063581A (en) * | 2000-08-23 | 2002-02-28 | Nippon Telegr & Teleph Corp <Ntt> | Method for detecting rotation angle of image and method for correcting rotation angle |
| JP2007212939A (en) * | 2006-02-13 | 2007-08-23 | Hitachi High-Technologies Corp | Inspection method of positional deviation, program and inspection device of positional deviation |
| EP3246160A1 (en) * | 2016-05-19 | 2017-11-22 | KBA-NotaSys SA | Measuring and correcting print-to-print register of a multicolour print formed on printed material |
| WO2019031207A1 (en) * | 2017-08-10 | 2019-02-14 | マイクロ・テック株式会社 | Screen printing device and screen printing method |
| CN111532014A (en) * | 2020-05-08 | 2020-08-14 | 深圳诚拓数码设备有限公司 | Automatic nesting printing machine and automatic nesting method |
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Application publication date: 20210629 |
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