CN114474998A - Ink dot identification monitoring method - Google Patents
Ink dot identification monitoring method Download PDFInfo
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- CN114474998A CN114474998A CN202210200386.5A CN202210200386A CN114474998A CN 114474998 A CN114474998 A CN 114474998A CN 202210200386 A CN202210200386 A CN 202210200386A CN 114474998 A CN114474998 A CN 114474998A
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- ink
- ink drop
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/07—Ink jet characterised by jet control
- B41J2/12—Ink jet characterised by jet control testing or correcting charge or deflection
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/015—Ink jet characterised by the jet generation process
- B41J2/02—Ink jet characterised by the jet generation process generating a continuous ink jet
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/015—Ink jet characterised by the jet generation process
- B41J2/02—Ink jet characterised by the jet generation process generating a continuous ink jet
- B41J2/025—Ink jet characterised by the jet generation process generating a continuous ink jet by vibration
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/015—Ink jet characterised by the jet generation process
- B41J2/02—Ink jet characterised by the jet generation process generating a continuous ink jet
- B41J2002/022—Control methods or devices for continuous ink jet
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- Ink Jet (AREA)
- Particle Formation And Scattering Control In Inkjet Printers (AREA)
Abstract
The invention discloses a method for identifying and monitoring ink dots. The image preprocessing unit segments the identification area and performs enhancement processing on the image of the identification area. And the ink drop characteristic extraction unit is used for extracting the characteristic value of the ink drop and the characteristic value of the charging electrode in the image of the identification area after acquiring the preprocessed image information sent by the image preprocessing unit, wherein the characteristic value of the ink drop comprises the shape and size of the outline of the ink drop, the distance between the ink drops and the verticality of the ink drop, and the characteristic value of the charging electrode comprises the central position of the charging electrode. And the ink drop identification unit is used for identifying the ink drop outline and comparing the outline position of the first independent ink drop outline with the central position of the charge electrode so as to judge whether the ink drop separation state is normal or not.
Description
Technical Field
The invention relates to a method for identifying and monitoring ink dots, and belongs to the technical field of visual identification.
Background
The basic jet printing principle of the ink jet printer is that after ink is jetted out from a nozzle hole of a nozzle crystal oscillator cavity, the ink is vibrated by a crystal oscillator, ink lines jetted out from the nozzle are separated into independent ink drops, the ink drops are charged with different electric quantities when passing through a charging electrode of the ink jet printer or are not charged, when the ink drops enter a high-voltage deflection electric field, because the electric quantities of all the ink drops are different, the ink drops are influenced by electric field force, the flight deflection angles of the charged ink drops are also different, the positions of the ink drops falling on the surface of an object to be printed are controlled, and the uncharged ink drops continue to keep a flight track and are recovered by an ink recovery device.
It can be seen that the charging process of the ink droplets at the charging electrode has an important effect on the printing effect, and the accuracy of the charging of the individual ink droplets by the charging electrode is closely related to the state of the ink ejected from the nozzle separating into individual ink droplets at the charging electrode.
Disclosure of Invention
The technical scheme of the invention aims to provide the ink dot identification monitoring method, which monitors the ink dot separation state through an image monitoring and identification technology, automatically adjusts crystal oscillator control parameters, ensures that the ink dots are in the optimal ink dot separation state, ensures that the ink dots can obtain the optimal charging effect, and ensures that the ink jet printer is in a normal working state.
An ink dot identification monitoring method, comprising: the device comprises an image acquisition unit, an image preprocessing unit, an ink droplet feature extraction unit and an image identification unit; the specific collection steps are as follows:
s1, collecting the ink line image at the charging electrode by the image collecting unit, and sending the ink line image to the image preprocessing unit;
s2, the image preprocessing unit segments the identification area and carries out enhancement processing on the image of the identification area;
s3, an ink droplet feature extraction unit extracts an ink droplet feature value and a charge electrode feature value in an image of the identification area after acquiring the preprocessed image information sent by the image preprocessing unit, wherein the ink droplet feature value comprises the shape, size, ink droplet distance and ink droplet verticality of an ink droplet outline, and the charge electrode feature value comprises the center position of a charge electrode;
and S4, the ink drop identifying unit identifies the ink drop outline in the ink point separating state, and compares the outline position of the first independent ink drop with the central position of the charge electrode to judge whether the ink drop separating state is normal.
Further, the image acquisition unit comprises a camera and an LED light source.
In step S2, the enhancement processing includes converting the image into a black-and-white image and performing two-level grayscale processing.
In step S4, the specific method for identifying the dot separation state is:
s41, if the ink drop identifying unit identifies the normal ink drop outline characteristic value, continuing the subsequent identification, otherwise, stopping the identification until receiving the step S3 to send new image data.
And S42, sequentially identifying from top to bottom in the image data according to the ink drop contour characteristic value until the first independent ink drop is identified, and if the independent ink drop can not be identified, judging that the ink drop separation state is abnormal.
S43, if the first independent ink drop is identified in the step S42, comparing the position of the independent ink drop with the center position of the charge electrode calibrated in the step S3, if the position of the first independent ink drop is in the vertical axis direction of the center of the charge electrode and the distance between the position of the first independent ink drop and the center position of the charge electrode is within 1mm, judging that the ink drop separation state is normal, and if the position of the first independent ink drop is not in the vertical axis direction of the center of the charge electrode or the distance between the position of the first independent ink drop and the center position of the charge electrode is over 1mm, judging that the ink drop separation state is abnormal.
In step S42, if the shapes, sizes, or pitches of the ink droplet profiles of a plurality of consecutive individual ink droplets are different, it is determined that the ink droplet separation state is not normal.
In step S42, if the first individual ink droplet position and the last individual ink droplet position are not in the vertical axis of the center of the charging electrode, it is determined that the ink line separation state is abnormal.
The technical scheme adopted by the invention has the advantages that:
1. the image of the ink dot separation state is collected through the camera, and the ink droplet separation state is analyzed through recognizing the image. The image recognition result can be used for a user to check and read in real time, and can also be used for the control unit to adjust the crystal oscillator voltage according to the ink drop separation state, so that the ink drop separation state is adjusted.
2. Through the automatically regulated of crystal oscillator, can offset printing ink viscosity in the certain extent, the influence that printing ink pressure brought to spouting the seal quality for printing ink viscosity, printing ink pressure's variation has the redundancy of equidimension, reduces the regulation work load to printing ink viscosity and printing ink pressure, keeps the stability of whole seal system of spouting longer.
Drawings
In order to more clearly illustrate the embodiments of the present application or technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and other drawings can be obtained by those skilled in the art according to the drawings.
FIG. 1 is a schematic diagram of the system of the present invention;
FIG. 2 is a flow chart of ink drop separation status recognition according to the present invention;
FIG. 3 is a schematic view of an ink droplet separation state of the present invention;
Detailed Description
The following describes the ink dot identification monitoring method in further detail with reference to the drawings and specific examples.
The ink dot identification monitoring method comprises the following steps: the device comprises an image acquisition unit, an image preprocessing unit, an ink droplet feature extraction unit and an image identification unit; the specific collection steps are as follows:
and S1, the image acquisition unit acquires the ink line image at the charging electrode and sends the ink line image to the image preprocessing unit. The image acquisition unit comprises a camera and an LED light source. The spray head of the ink-jet printer is of a closed structure, and in order to obtain a clear image, an LED light source can be added to supplement light for the camera; furthermore, the flash frequency of the light supplementing light source can be adjusted according to the frequency of the crystal oscillator of the spray head.
S2, the image preprocessing unit segments the identification area and carries out enhancement processing on the image of the identification area. Specifically, the position of the main body in the image is detected, and the main body area of the image is cut out. Because the ink drops sprayed by the nozzle of the ink-jet printer inevitably pass through the charging electrode, the ink drops are cut according to the main body area of the charging electrode, and the image of the identification area is obtained. Because the camera and the position of the charging electrode are relatively fixed, the identification area needing to be cut can be quickly positioned according to the width and the height of the positioning position of the charging electrode.
S3, the ink drop characteristic extraction unit extracts the ink drop characteristic value and the charging electrode characteristic value in the image of the identification area after acquiring the preprocessed image information sent by the image preprocessing unit, wherein the ink drop characteristic value comprises the shape, the size, the ink drop distance and the ink drop verticality of the ink drop outline, and the charging electrode characteristic value comprises the center position of the charging electrode.
And S4, the ink drop identifying unit identifies the ink drop outline and compares the outline position of the first independent ink drop with the central position of the charge electrode so as to judge whether the ink drop separation state is normal.
In step S2, the enhancement processing includes converting the image into a black-and-white image and performing two-level grayscale processing.
In step S4, the specific method for identifying the dot separation state is:
s41, if the ink drop identifying unit identifies the ink drop outline characteristic value, the subsequent identifying processing step is continued, otherwise, the identification is stopped until receiving the step S3 to send new image data.
And S42, sequentially identifying from top to bottom in the image data according to the ink drop contour characteristic value until the first independent ink drop is identified, and if the independent ink drop can not be identified, judging that the ink drop separation state is abnormal.
S43, if the first independent ink drop is identified in the step S42, comparing the position of the independent ink drop with the center position of the charge electrode calibrated in the step S3, if the position of the first independent ink drop is in the vertical axis direction of the center of the charge electrode and the distance between the position of the first independent ink drop and the center position of the charge electrode is within 1mm, judging that the ink drop separation state is normal, and if the position of the first independent ink drop is not in the vertical axis direction of the center of the charge electrode or the distance between the position of the first independent ink drop and the center position of the charge electrode is over 1mm, judging that the ink drop separation state is abnormal. The presence of individual ink drops at the center of the charging electrode, either too early or too late, can affect the accuracy of the jet printing.
In step S42, if the shapes, sizes, or pitches of the ink droplet profiles of a plurality of consecutive individual ink droplets are different, it is determined that the ink droplet separation state is not normal. The ink drop profile in the normally separated state should be independent, not stick to adjacent drops, and multiple consecutive independent drop intervals should be the same. The shape, size and spacing of the ink drop profile can be used to visually determine the ink drop separation status. In addition, the central position of the charging electrode is used as a positioning datum point, the ink drops which are firstly broken into independent and complete ink drops are ensured to be in the same shape and size when the ink drops pass through the central position of the charging electrode, and the charged ink drops can be ensured to be in the same deflection flight angle in a deflection area and accurately fall on a specified position on the surface of an object to be printed, so that higher jet printing quality is obtained. If the ink drops are different in shape and size, even if the ink drops are charged with the same amount of electricity, the deflected flight paths are deviated, and the jet printing quality is not expected.
In step S42, if the first individual ink droplet position and the last individual ink droplet position are not in the vertical axis of the center of the charging electrode, it is determined that the ink line separation state is abnormal. Based on the plane coordinate system, if the values on the horizontal axes of the positions of the first independent ink drop and the last independent ink drop are different, the ink drop ejection path is judged to be not vertical. The non-vertical ejection path of the ink drops can cause the charged ink drops to pass through the high-voltage deflection region, the deflection flight path cannot be expected, and the ink drops can pollute other components in the spray head. Therefore, the recognition of the perpendicularity of the ink line is also one of the factors for judging whether the ink line separation state is normal or not.
The ink drop identification unit sends the ink drop separation state to the control unit and/or the storage unit, and the control unit can adjust the crystal oscillator voltage according to the ink drop separation state until the ink drop separation state is normal, and stops controlling and adjusting the crystal oscillator voltage. In addition, the identification result of the ink drop separation state is also sent to a storage unit for a user to synchronously check or retrieve historical data for the inspection and maintenance of the ink jet printer.
While certain exemplary embodiments of the present invention have been described above by way of illustration only, it will be apparent to those of ordinary skill in the art that the described embodiments may be modified in various different ways without departing from the spirit and scope of the invention. In the specification, the number of the paragraph is only used for conveniently referring to the text of the paragraph number, and should not be regarded as the restriction of the execution sequence of the described technical solution. Accordingly, the drawings and description are illustrative in nature and should not be construed as limiting the scope of the invention.
Claims (6)
1. An ink dot identification monitoring method, comprising: the device comprises an image acquisition unit, an image preprocessing unit, an ink droplet feature extraction unit and an image identification unit; the specific collection steps are as follows:
s1, collecting the ink line image at the charging electrode by the image collecting unit, and sending the ink line image to the image preprocessing unit;
s2, the image preprocessing unit segments the identification area and carries out enhancement processing on the image of the identification area;
s3, an ink droplet feature extraction unit extracts an ink droplet feature value and a charge electrode feature value in an image of the identification area after acquiring the preprocessed image information sent by the image preprocessing unit, wherein the ink droplet feature value comprises the shape, size, ink droplet distance and ink droplet verticality of an ink droplet outline, and the charge electrode feature value comprises the center position of a charge electrode;
and S4, the ink drop identifying unit identifies the ink drop outline in the ink point separating state, and compares the outline position of the first independent ink drop with the central position of the charge electrode to judge whether the ink drop separating state is normal.
2. A dot identification monitoring method as claimed in claim 1, wherein: the image acquisition unit comprises a camera and an LED light source.
3. A dot identification monitoring method as claimed in claim 1, wherein: in step S2, the enhancement processing includes converting the image into a black-and-white image and performing two-level grayscale processing.
4. A dot identification monitoring method as claimed in claim 1, wherein: in step S4, the specific method for identifying the dot separation state is:
s41, if the ink drop identifying unit identifies the ink drop outline characteristic value, continuing the subsequent identification, otherwise, stopping the identification until receiving the step S3 to send new image data.
And S42, sequentially identifying from top to bottom in the image data according to the ink drop contour characteristic value until the first independent ink drop is identified, and if the independent ink drop cannot be identified, judging that the ink drop separation state is abnormal.
S43, if the first independent ink drop is identified in the step S42, comparing the position of the independent ink drop with the center position of the charge electrode calibrated in the step S3, if the position of the first independent ink drop is in the vertical axis direction of the center of the charge electrode and the distance between the position of the first independent ink drop and the center position of the charge electrode is within 1mm, judging that the ink drop separation state is normal, and if the position of the first independent ink drop is not in the vertical axis direction of the center of the charge electrode or the distance between the position of the first independent ink drop and the center position of the charge electrode is over 1mm, judging that the ink drop separation state is abnormal.
5. The ink dot identification monitoring method according to claim 4, wherein: in step S42, if the shapes, sizes, or pitches of the ink droplet profiles of a plurality of consecutive individual ink droplets are different, it is determined that the ink droplet separation state is not normal.
6. A dot identification monitoring method as claimed in claim 4, wherein: in step S42, if the first individual ink droplet position and the last individual ink droplet position are not in the vertical axis of the center of the charging electrode, it is determined that the ink line separation state is abnormal.
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| CN202210200386.5A CN114474998B (en) | 2022-03-02 | 2022-03-02 | Ink dot recognition monitoring method |
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| CN202210200386.5A CN114474998B (en) | 2022-03-02 | 2022-03-02 | Ink dot recognition monitoring method |
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| CN114474998B CN114474998B (en) | 2023-03-28 |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6509917B1 (en) * | 1997-10-17 | 2003-01-21 | Eastman Kodak Company | Continuous ink jet printer with binary electrostatic deflection |
| US20100245489A1 (en) * | 2009-03-26 | 2010-09-30 | North Carolina Agricultural And Technical State University | Methods and apparatus of manufacturing micro and nano-scale features |
| CN104723678A (en) * | 2015-03-12 | 2015-06-24 | 上海交通大学 | Electro hydrodynamic preparation device and method for batch micro-droplets and micro-structures |
| JP2017142208A (en) * | 2016-02-12 | 2017-08-17 | セイコーインスツル株式会社 | Droplet discharge device, and droplet discharge inspection method |
| CN110525048A (en) * | 2019-08-30 | 2019-12-03 | 合肥京东方卓印科技有限公司 | A kind of device, system and method measuring droplet volume |
| CN212737503U (en) * | 2020-06-02 | 2021-03-19 | 上海美创力罗特维尔电子机械科技有限公司 | CCD-based ink dot monitoring system of ink jet printer |
| CN113568589A (en) * | 2021-07-30 | 2021-10-29 | 森彩数字印刷技术(深圳)有限公司 | Method, device and equipment for judging printing precision and storage medium |
-
2022
- 2022-03-02 CN CN202210200386.5A patent/CN114474998B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6509917B1 (en) * | 1997-10-17 | 2003-01-21 | Eastman Kodak Company | Continuous ink jet printer with binary electrostatic deflection |
| US20100245489A1 (en) * | 2009-03-26 | 2010-09-30 | North Carolina Agricultural And Technical State University | Methods and apparatus of manufacturing micro and nano-scale features |
| CN104723678A (en) * | 2015-03-12 | 2015-06-24 | 上海交通大学 | Electro hydrodynamic preparation device and method for batch micro-droplets and micro-structures |
| JP2017142208A (en) * | 2016-02-12 | 2017-08-17 | セイコーインスツル株式会社 | Droplet discharge device, and droplet discharge inspection method |
| CN110525048A (en) * | 2019-08-30 | 2019-12-03 | 合肥京东方卓印科技有限公司 | A kind of device, system and method measuring droplet volume |
| CN212737503U (en) * | 2020-06-02 | 2021-03-19 | 上海美创力罗特维尔电子机械科技有限公司 | CCD-based ink dot monitoring system of ink jet printer |
| CN113568589A (en) * | 2021-07-30 | 2021-10-29 | 森彩数字印刷技术(深圳)有限公司 | Method, device and equipment for judging printing precision and storage medium |
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