CN110077113A - Method for being detected to the failure print nozzles in ink-jet printer - Google Patents
Method for being detected to the failure print nozzles in ink-jet printer Download PDFInfo
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- CN110077113A CN110077113A CN201910072928.3A CN201910072928A CN110077113A CN 110077113 A CN110077113 A CN 110077113A CN 201910072928 A CN201910072928 A CN 201910072928A CN 110077113 A CN110077113 A CN 110077113A
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Classifications
-
- 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
- B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
- B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
- B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
- B41J2/0451—Control methods or devices therefor, e.g. driver circuits, control circuits for detecting failure, e.g. clogging, malfunctioning actuator
-
- 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
- B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
- B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
- B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
- B41J2/04586—Control methods or devices therefor, e.g. driver circuits, control circuits controlling heads of a type not covered by groups B41J2/04575 - B41J2/04585, or of an undefined type
-
- 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
- B41J2/135—Nozzles
-
- 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
- B41J2/135—Nozzles
- B41J2/165—Prevention or detection of nozzle clogging, e.g. cleaning, capping or moistening for nozzles
-
- 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
- B41J2/17—Ink jet characterised by ink handling
- B41J2/175—Ink supply systems ; Circuit parts therefor
-
- 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
- B41J2/21—Ink jet for multi-colour printing
- B41J2/2132—Print quality control characterised by dot disposition, e.g. for reducing white stripes or banding
- B41J2/2139—Compensation for malfunctioning nozzles creating dot place or dot size errors
-
- 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
- B41J2/21—Ink jet for multi-colour printing
- B41J2/2132—Print quality control characterised by dot disposition, e.g. for reducing white stripes or banding
- B41J2/2146—Print quality control characterised by dot disposition, e.g. for reducing white stripes or banding for line print heads
-
- 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
- B41J25/00—Actions or mechanisms not otherwise provided for
- B41J2025/008—Actions or mechanisms not otherwise provided for comprising a plurality of print heads placed around a drum
Landscapes
- Engineering & Computer Science (AREA)
- Quality & Reliability (AREA)
- Ink Jet (AREA)
Abstract
The present invention relates to a kind of methods for the failure print nozzles (10,15) in ink-jet printer (7) to be detected and compensated by computer (6) in the case where printing is greater than one: by ink-jet printer (7) press figure printing image (8) at least once；There is at least another secondary press figure printing image (8) that misplaces perpendicular to print direction；At least one imaging sensor shooting printing image；The printing image (13) of shooting is split into color separation (14)；By the perpendicular column ground summation (11) of the pixel value of each color separation (14)；In the difference signal (10) of the perpendicular column summation (11) of the pixel value of each color separation (14) for the printing image (13) for forming shooting with and without dislocation (12) perpendicular to print direction；Pass through the peakology detection failure print nozzles (10,15) in difference signal；It turns off failure print nozzles (10,15) and is compensated by adjacent nozzle.
Description
Technical field
The present invention relates to a kind of methods for the failure print nozzles in ink-jet printer to be detected and compensated.
The present invention is based on the technical fields of digital printing.
Background technique
In industrial print field, digital printing (especially in the form of ink jet printing) obtains increasing concern.
Here, considering the offset printing preferably applied in terms of ensuring press quality with the past with determining by system in ink jet printing
Print different problems.Thus the specific problem of these ink-jets must be examined specially in the scope that automation quality ensures naturally
Consider.Emphasis is related to the failure of single print nozzles in ink jet printing head herein.These failure print nozzles can generate specifically
Defect image, the defect image are specially characterized for ink jet printing, and " defect nozzle is also used as in this technical field
(missing nozzle) " is known.
The reason of this failure print nozzles, can be diversified.If print nozzles are between longer time
Every not applying, then main cause is the exsiccation of print nozzles.The ink residue to have dried out plugs print nozzles herein,
To which these print nozzles are no longer able to print, be merely capable of printed portions and/or can print the printing points of skew.Other mistakes
Source includes dust granule or other particles, they can clogging print nozzles outlet.So impaired print nozzles meeting
Cause the unique product (Artefakte) in printing image generated.The print nozzles of for example complete failure are in monochrome as a result,
In the case where printing on such position (on the position, this print nozzles no longer help print image) in white printing
White line is left in substrate, therefore also referred to as " white line (white line) ".Print nozzles with crooked printing points are (if the print
Brush nozzle is excessively consumingly if deviation) equally cause " white line ".Here, however additionally generating so-called " black line (dark
Line) ", i.e., generate on such position: its ink is applied on the position by the print nozzles of skew injection.The face of white line
Color is related to the printing substrate being based on herein.Colored printing substrate (such as paper of bright green) causes corresponding bright green naturally
Line.If being polychrome printing on this position, which results in the distortion of color value (Verzerrung).The color of these distortions
Although value is less obvious in completed printing image, nonetheless in most cases still may be used for human eye
It easily identifies.
In order to eliminate print defect nozzle, and in order to correspondingly avoid white line, a variety of sides are disclosed in the prior art
Case.Other than maintaining the print nozzles (or print head) of redundancy, for instance, it is known that using that can be printed on same position
The print nozzles of other print colors, to be imitated as well as possible by mixing of the remaining available color on this position
Produce the color value of failure print nozzles lacked.The color value lacked very can be copied accurately in rare cases herein
Out, however itself is close to preferably printing image significant for human eye.
In addition to this, it is for compensating the major programme of defect nozzle, by executing the adjacent of the ink improved application
Print nozzles compensate (or defect) print nozzles of failure.These adjacent print nozzles apply so many oil herein
Ink, so that the print nozzles of missing become unobvious well as far as possible between these adjacent print nozzles
In the case where only part failure or the print nozzles of skew printing, it is necessary to the compensation side that will be carried out by adjacent print nozzles
Formula is correspondingly adapted to.Normally, for practical reasons, (failure) print nozzles by involved in complete switch off, and then
It is compensated as failure print nozzles by adjacent nozzle.Herein always in view of not executing overcompensationBecause this will lead to corresponding concealed wire (" black line ") due to excessively high ink application.
In order to must compensating defective print nozzles on the whole, however must disposably detect this print nozzles first.
For this purpose, equally disclosing a variety of methods in the prior art.Common scheme is, prints at regular intervals in printing substrate
Test pattern (Testmuster) out, in these test patterns, whole print nozzles of the print head of all applications print respectively
Brush out at least one small test object.These test patterns, which then can pass through image detecting system to preferably automatedization, to carry out
Measurement and analysis processing.If showing one of these image objects, there are significant deviations, it is possible thereby to be inferred to phase
Answer the state of print nozzles.Thus print defect nozzle can be detected relatively reliable.The disadvantages of this solution however be, this
A little test patterns due to their structure and they all to exist and with the printing image different to be generated originally.Cause
This can't always be: whether that print nozzles outstanding also veritably cause image artifacts (such as in " white in test pattern
Line " form).The evaluation criteria according to used by being directed to generated image object in test pattern, thus by means of test chart
Printing and the analysis processing of case are frequently found excessively a small amount of failure print nozzles.It is different, in the feelings that standard is excessively stringent
Under condition, excessive error resistance determining failure (Falsch-Positivfehler) is often sought out and correspondingly by excessive print
Brush nozzle is characterized as defective.Furthermore these test patterns need space in printing substrate, and this increase maculatures.Often
Ground is exactly the only one test pattern for printing out applied print color in each page for those reasons, this causes
Corresponding downtime is until finding out failure print nozzles.
In order to avoid these disadvantages, thus it is known in the art, it is based on generated printing image itself, is detected
Print defect nozzle.10 2,015 2,075 66 B3 of German patent DE discloses a kind of detect in printing image and falls vacant as a result,
The method for falling into print nozzles, mode are that digital printing image is made to shift and incite somebody to action perpendicular to print direction relative to print head
Physical print head oppositely shifts, and the drift (Wandern) by corresponding print nozzles in printing substrate can be known as a result,
Other: whether image component part (such as white line) outstanding passes through caused by failure print nozzles, or whether it is printing figure
As the component part of itself.
In addition, a kind of for detecting as known to currently also undocumented German patent application DE 10 2,016 2,249 71.1
The method of failure print nozzles, wherein perpendicular column summation characteristic curve is generated by generated printing image
(Spaltensummenprofil), and by this column summation characteristic curve perpendicular column summation spy corresponding to desired reference image is erected
Linearity curve is compared, to detect the amplitude as caused by white lineThese amplitudes can then attach
In print defect nozzle.
However these methods also have the shortcomings that.As a result, for example based on by means of erecting the characteristic method of column summation
It can not exclude to target reliability the product as caused by the reason different from defect nozzle.By means of digital printing image shift
In addition frequent problem is in the method for print head shift reverse: print head can not sufficiently rapidly relative shift or print head
Displacement expended very much for constantly monitoring quality.
Summary of the invention
Therefore the task of the present invention is to provide a kind of for detect and the subsequent method of compensating defective print nozzles, this
Known method is more effectively run method compared with the prior art.
The task is by a kind of for passing through computer in the case where printing (Druckauflage) is greater than one to ink-jet
The method that failure print nozzles in printing machine are detected and compensated is addressed, and described method includes following steps: by
Property prints out the existing printing image of digital form to ink-jet printer at least once；To have the side of dislocation perpendicular to print direction
Property additionally prints out the existing printing image of digital form to formula at least once；It is printed by the shooting of at least one imaging sensor
The printing image of brush；Captured printing image is split into (Zerlegen) into each color separation；By the pixel value of each color separation with
Perpendicular column mode (Spaltenweise) seeks summation；By perpendicular to print direction with and without dislocation in a manner of to captured
The perpendicular column summation for printing the pixel value of each color separation of image forms difference signal；It is visited by the peakology in difference signal
Measure failure print nozzles；And it turns off detected failure print nozzles and is compensated by adjacent nozzle.Namely
It says, the method according to the invention is by the known in the art method for being used to print image shift and is used to form perpendicular column summation
Characteristic method is combined and also improves to these methods.It is individually that each perpendicular column are total compared to only as a result,
For being compared with characteristic curve with its digital form desired reference image, such as by each point of captured printing image
The perpendicular column summation of the pixel value of color by perpendicular to print direction with and without dislocation in a manner of to form difference signal then be more
Effectively.Another improvement project of known method compared with the prior art, the method according to the invention is in difference signal
It was found that target carry out accurately peakology (Peak-Analyse), wherein it for example can be excluded by peakology
His error reason (such as defect in printing substrate).It is designed for more printings herein in method disclosed in this current shape
Print the printing of image.This is the conventional situation in print job to be done.However, because ink jet printing also can be realized
Special case with the only print job of unique printing, therefore it is also contemplated that arrive this special case.In this regard, next
Also it will be explained in more detail.
This method is advantageous and then preferred improvement project is by affiliated dependent claims and saying with affiliated attached drawing
It is bright to obtain.
The advantageous modification of the method according to the invention is that being split for captured printing image is each herein
Color separation includes such component part: process colour CMYK and selectable other technique employed in printing process
Color (especially OGV).Each color separation includes various process colours (Prozessfarben) applied by difference herein.These
Process colour is usually CMYK and may include other process colour.It is different from method known in the art, according to
It is to be compared to each other the perpendicular column summation characteristic curve of each color separation in method of the invention, and in the methods known in the prior art
Be the printing image that will have been printed and detected perpendicular column summation characteristic curve with it is no mistake in the case where digital form deposit
Desired reference image be compared.Compared with prior art, method of the invention is significant more effective embodiment, because
It is to include all color separations and may correspondingly be distorted for perpendicular column summation characteristic curve in the prior art method.
Another advantageous modification of the method according to the invention is herein, by means of transformation matrix or by face
Captured printing image is split into each point by the locating function (Lookup) in color configuration feature file (ICC-Profil)
Color: i.e. process colour CMYK and other process colour.For captured and digitized printing image is split into each point
For color, above two method is all feasible.Using any in both methods, this must be by user in view of accordingly depositing
Specific situation make a decision.Also it is possible that in view of the presence of standard automatically determine.
Another advantageous modification of the method according to the invention is herein, will pass through at least one imaging sensor institute
The rgb value of the printing image of shooting is using interpolation calculation until the image resolution ratio for obtaining printed printing image.
Image detecting system applied by current additionally has following problem, that is, caused by image detecting system correspondingly detects
Print the printed resolution that resolution ratio used by image will be lower than applied ink-jet printer.Therefore, it is printed to reach
The image resolution ratio of the printing image of brush, it is necessary to be acquired in through RGB image caused by imaging sensor using interpolation method
The value lacked.
Another advantageous modification of the method according to the invention is herein, in order to examine to above-mentioned detection and compensation
It tests, then there is digital form at least one other iteration round (iterativenDurchlauf) of this method
Printing image by perpendicular to print direction with or without dislocation in a manner of carry out at least another one-step print and according to this
Method is analyzed and processed.In order to ensure: veritably correct detection and is unlikely to be other mistake to print defect nozzle
Accidentally reason produces the corresponding product for leading to detect print defect nozzle, then being suitble at least one other iteration round
In detection result is verified.Disposable mistake always may disposably occur in detection, however repetitive error is then
It is much rare.Accordingly, it is shown that system mistake, this system mistake may be due to when executing the method according to the invention
Caused by mistake.Nevertheless, the other iteration round of this method significantly improves above-mentioned detection and then subsequent compensation knot
Fruit.
Another advantageous modification of the method according to the invention is herein, in order to above-mentioned detection and compensation result into
Performing check additionally turns off detected failure respectively and prints spray at least one other iteration round of this method
The adjacent print nozzles of the one of mouth.Another adjustment criteria (this can change in other iteration round), which is off, to be detected
The respective adjacent print nozzles of the one of failure print nozzles.Thus, it is possible to ensure also really to detect correct (defect) print nozzles
It is defective.What this was commonly necessary, because being in place of the weakness of defect nozzle detection in really printing image, although
White line is often correctly identified out, however is not associated with correct (defect) printing spray due to image resolution ratio problem for example
Mouth.By the way that the failure print nozzles detected, respectively adjacent print nozzles are tested, even if without excluding completely,
This mistake can be minimized.
Another advantageous modification of the method according to the invention is herein, to have dislocation perpendicular to print direction
Mode carries out property at least once to printing image and additionally prints, this is only for applied process colour CMYK and other
The color separation of one of process colour carries out.Another selection scheme is, passes through the number of printing image to a kind of only color separation of determination
The displacement of word formula misplaces to be equipped with.This significantly reduces the consumings of the method according to the invention, and especially have in the case where there
It is significant: especially to hold for defect nozzle if a kind of color of determination (or the print head for being responsible for this color) is used as
Color (or print head) vulnerable to influence is known.
Another advantageous modification of the method according to the invention is that this method is used for page ink-jet printer herein,
And printed and shooting printing image corresponds to each printing page.Even if this method can be used in the institute of ink-jet printer
There is type (can also be used for the roll type ink-jet printer of web printing), however preferred application field is page ink jet printing
Machine prints out to be generated in each printing page and passes through the digitized print of image detecting system in the application field
Map brushing picture.
Another solution of being proposed for task is a kind of for passing through computer pair in the case where printing is equal to one
The method that failure print nozzles in ink-jet printer are detected and compensated, described method includes following steps: by ink-jet
Press printing goes out the existing printing image of digital form；Printing image is shot by least one imaging sensor；It will be clapped
The printing image and digital print original text taken the photograph split into each color separation；The pixel value of each color separation is sought into summation in a manner of perpendicular column；
The perpendicular column summation of the pixel value of each color separation of captured printing image and digital print original text is formed into difference signal；Pass through difference
Peakology in xor signal detects the print nozzles that are out of order；It turns off detected failure print nozzles and passes through adjacent spray
Mouth compensates.This variant schemes of the method according to the invention is specially designed for that there is printing of the printing equal to one to appoint
Business.The difference of this and standard variations scheme is only in that: printing image is not implemented repeatedly printing herein (including will print image
Shifted in a manner of there is dislocation perpendicular to print direction), but printing image only uniquely once is printed and then will
Generated perpendicular column summation characteristic curve is compared with the available perpendicular column summation characteristic curve of digital print original text.This is related to
The each color separation for the printing image that (as also in standard variations scheme) is detected.It thus also can be to printing etc.
It is checked in terms of the possible misprint as caused by defect nozzle in the special case of one print job.
Detailed description of the invention
The present invention is as of the invention and construction and/or being functionally advantageously improved scheme referring next to attached
Figure is further described according at least one preferred embodiment.In the accompanying drawings, mutual corresponding element is equipped with respective identical attached drawing
Label.Attached drawing is shown:
Fig. 1: according to the view of page ink-jet printer of the present invention；
Fig. 2: the white line as caused by defect nozzle in printing image；
Fig. 3: it is vertically to the effect of the dislocation of print direction；
Fig. 4: column summation characteristic curve is erected as caused by printing image；
Fig. 5: the schematic diagram of the process of the method according to the invention.
Specific embodiment
The application field that modification is preferably implemented is ink-jet printer 7.The basic knot for this machine 7 is shown in FIG. 1
The example of structure comprising: the feeder 1 for being supplied to printing substrate 2 in printing machine 4 is up to collector 3, in the printing
Printing substrate is printed by print head 5 in unit 4.Herein relate to the page ink jet printing controlled by control computer 6
Machine 7.In the operation of printing machine 7, as described above, single print nozzles may occur in the print head 5 in printing machine 4
Failure.Then consequence is " white line " 9, or is the color value of distortion in the case where polychrome printing.Printing image is shown in FIG. 2
The example of " white line " 9 this in 8.
For defect nozzle detection for, it is conclusive herein to be: identify printing image in all defective nozzles 10,
15.Because the failure of print nozzles visibility greatly related to quantity of ink and defective nozzle 10,15 then greatly with wire sideStructure it is related, therefore the nozzle 10,15 of failure is advantageously directly searched in printing image.Failure
Nozzle 10,15 by printing image formed difference (Differenzbildung) otherwise printing be equal to one in the case where by
Original text is printed to be detected or be detected in the case where printing is greater than one by the printing image laterally to misplace.Most frequently the case where
It is the print job that there is printing to be greater than one herein.
Therefore, in response to this, preferred embodiment is described below, the preferred embodiment is schematically referring to its process
Also it is shown in FIG. 5.
I. printing process (printing > 1):
1. printing does not have the printing image laterally to misplace,
2. the printing image 12 with lateral dislocation (1-10 printed pixels) is printed,
3. repeating step 1.
The effect that printing image 12 misplaces in printing substrate 2 is shown in detail in Fig. 3.The image 12 each printed
Or image section carries out digitlization by image detecting system and analysis is handled, described image detection system is as intraconnected quality
Ensure systemIt can be the part of printer system 7.Image detecting system
There is at least one imaging sensor herein, which is placed in after last printing machine 4 (or print head 5).
In addition, image detecting system has pattern process computer, in the pattern process computer, to digitized printing image again
13 carry out inspection and analysis processing.For any reason, if pattern process computer is not available, another computer 6
(such as control computer of printing machine 7) can also be used for analysis processing.Before printing next copy, printing image 8 is led to
It crosses and electronically shifts one or more print nozzles transverse to print direction, so that other print nozzles print these images
Information.The line of image/perpendicular column are in this process based on its nozzle attachment relationship (D ü senzuordnung) with digital displacement
Magnitude change.It is initial at it by caused (namely desired) the linear product of the perpendicular column of the printing of not printed data
Position on be retained in the synthesized image shifted.Differently therefrom, by caused by print defect nozzle 10, be in
The linear product for printing perpendicular 9 form of column drifts about in synthesized printing image in contrast to digital direction of displacement, this is because
Print defect nozzle 10 continues to print printing substrate 2 on same position, however exactly prints image 8 in press figure formula at this time
Another image section.Whereby, as detected by imaging sensor, with and without digital displacement
Image 13 simply forms difference, this can be used as reliably distinguishing standard between print defect nozzle and image data, for
It is that a kind of otherness of the line as along print direction/perpendicular column is shown for this species diversity.
Lateral misplace for printing image 12 can be in another implementation modification also only with a kind of color separation (rather than institute
There is color).It is possible thereby to simplify the detection to correct color separation and defective nozzle.For this purpose, additional downtime is generated, because needing
It will be for more time until checking out all color separations for defect nozzle 10.
The influence of the method and step and printing image 12 of these descriptions laterally to misplace is in the scope handled with post analysis
It is examined together to detect occurred defect nozzle 10.
II. analysis is handled:
1. detecting video camera by RGB shoots printing image 13 with row scanning mode (Zeilenweise).
2. the rgb value of video camera is converted into print pixel resolution ratio using interpolation methodRequired video camera print pixel image (Kamera-Printpixel- thus
Mapping (such as testing by PrintHeadColor test or BigDot)) is sought in advance.
3. RGB image is split by means of the locating function in transformation matrix or color configuration characteristic file
CMYKGOV component.
4. for each color CMYKGOV: seeking summation in a manner of perpendicular column to pixel value.
5. for each color CMYKGOV: the perpendicular column summation of page shape with and without lateral dislocation
At difference.
6. for each color CMYKGOV: detecting defective nozzle by the peakology in difference signal.
At this point, computer 6 forms each 14 edge of color separation in by image detecting system again digitized printing image 13
The perpendicular column summation 11 of print direction, thus, in extreme circumstances, for each Color Channel, by whole image 13 or part
Image reduces into unique images row.In general, this occurs on entire printing width.For this purpose, for clarity reasons, by each color separation
The summation of color value be standardized into the quantity of perpendicular column pixel, thus, and generate the color value between 0 to 255.Which results in: in event
Hinder and form peak value at the position of print nozzles 15, these peak values protrude from its adjacent part significantly.In a manner of obviously,
This can be to exemplify with the panchromatic tune column (Volltonbalken) in green channel 8, as being shown in FIG. 4 this.?
This it also seen that, significantly reduce the noise of video camera and printing and seeking summation in multiple pixels, and then by lacking
It is more significantly prominent to lose signal caused by nozzle 15.In order to accurately find out peak value, (these peak values are produced corresponding to image now
Object, i.e. image deflects), it will then be erected caused by each color separation 14 for the printing image 13 digitized again that there is dislocation 12
The corresponding perpendicular column of column summation characteristic curve 11 from each color separation 14 for the printing image 13 digitized again for not having dislocation are total
It is subtracted with characteristic curve 11.Based on difference signal, the print nozzles 10 that are out of order can be then sought.As a result, existing at this
Peak value be then also subject to another peakology, to ensure: the required peak value got is veritably to be caused by defect nozzle 15,
Rather than caused by other error reasons (such as substrate defects).
Another variant schemes that is preferably implemented is that specially to adapt to have printing be one print job.Because identical herein
The dislocation printed between the printing twice of image is impossible naturally, therefore is replaced in digital again with and without dislocation
Comparison and use digital print original text itself conduct reference between the printing image 13 of change.Subsequently, for every kind of color separation 14, calculate
Tiff prints the perpendicular column summation of original text, and by it compared with the perpendicular column summation 11 for the image 13 for actually printing and measuring.GIFf image
Perpendicular column summation 11 calculating nature need each self-application computer additional operational capability.
III. it compensates
1. turning off detected failure print nozzles 10,15, and compensated by adjacent nozzle.
2. passing through reanalysing processing and examine above-mentioned detection in such a way that there is/not have lateral dislocation.
3. if possible can iteratively turn off adjacent nozzle (one nozzle of each iteration) and process of repeating print+point
Analyse treatment process.
It can be identified by the method according to the invention in described form of implementation at this time all for printing image
Relevant defective nozzle 10,15.Furthermore the space requirement for other control elements is not needed.This can be in failure and detection
Between with very little downtime in the case where all print colors in each printed sheet 2 are monitored.
Reference signs list:
1 feeder
2 printing substrates
3 collectors
4 ink jet printing units
5 ink jet printing heads
6 computers
7 ink-jet printers
8 total printing figures
9 white lines
10 by forming the defect nozzle got required by difference
11 perpendicular column summation characteristic curves
12 have the printing image of dislocation printing
13 pass through image detecting system digitized printing image again
The 14 digitized each color separations for printing image again
15 defect nozzle by being got required by peakology
Claims (9)
1. one kind is for printing spray to the failure in ink-jet printer (7) by computer (6) in the case where printing is greater than one
The method that mouth (10,15) is detected and compensated, described method includes following steps:
By ink-jet printer (7), property prints out existing printing image (8) of digital form at least once；
Property additionally prints out printing existing for the digital form at least once in a manner of having dislocation perpendicular to print direction
Image (8)；
Pass through the printed printing image of at least one imaging sensor shooting；
Captured printing image (13) is split into each color separation (14)；
Summation (11) are asked in a manner of perpendicular column to the pixel value of each color separation (14)；
To the perpendicular column summation (11) of the pixel value of each color separation (14) of captured printing image (13) perpendicular to printing side
Difference signal (10) are formed to the mode with and without dislocation (12)；
The print nozzles that are out of order (10,15) are detected by the peakology in difference signal；
It turns off detected failure print nozzles (10,15) and is compensated by adjacent nozzle.
2. according to the method described in claim 1,
It is characterized in that,
Captured printing image (13) it is split at each color separation (14) include following component part: in printing process
Applied process colour CMYK and selectable other process colour, the other process colour especially OGV.
3. according to the method described in claim 2,
It is characterized in that,
Captured printing image (13) is split into each color separation (14) of process colour CMYK and other process colour, this
It is carried out by means of transformation matrix or by the locating function in color configuration characteristic file.
4. method according to one of the above claims,
It is characterized in that,
Interpolation calculation will be used by the rgb value of printing image (13) captured by least one imaging sensor until obtaining
The image resolution ratio of printed printing image.
5. method according to one of the above claims,
It is characterized in that,
It, will be digital at least one other iteration round of the method in order to test to detection and compensation result
Existing printing image (8) of form by perpendicular to print direction with or without dislocation in a manner of carry out at least another one-step print
And it is analyzed and processed according to the method.
6. method according to one of the above claims,
It is characterized in that,
It is attached respectively at least one other iteration round of the method in order to test to detection and compensation result
Turn off an adjacent print nozzles of detected failure print nozzles (10,15) with adding.
7. method according to one of the above claims,
It is characterized in that,
Printing image is carried out property at least once in a manner of there is dislocation (12) perpendicular to print direction additionally to print, this is only
It is carried out only for one of applied process colour CMYK and the other process colour color separation.
8. method according to one of the above claims,
It is characterized in that,
The method is used for page ink-jet printer (7), and printed and shooting printing image (13) is held corresponding to each
Printed page.
9. one kind is for printing spray to the failure in ink-jet printer (7) by computer (6) in the case where printing is equal to one
The method that mouth (15) is detected and compensated, described method includes following steps:
Existing printing image (8) of digital form is printed out by ink-jet printer (7)；
The printing image is shot by least one imaging sensor；
Captured printing image (13) and digital print original text (8) are split into each color separation (14)；
The pixel value of each color separation (14) is sought into summation in a manner of perpendicular column；
To the perpendicular column summation of the pixel value of each color separation (14) of captured printing image (13) and digital print original text (8)
(11) difference signal is formed；
The print nozzles that are out of order (15) are detected by the peakology in difference signal；
It turns off detected failure print nozzles (15) and is compensated by adjacent nozzle.
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| DE102018201174 | 2018-01-25 |
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| CN111959129A (en) * | 2020-08-04 | 2020-11-20 | 厦门汉印电子技术有限公司 | Bad point detection method and device for printing head and thermal printer |
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| CN116452827B (en) * | 2023-06-16 | 2023-08-15 | 青岛奥维特智能科技有限公司 | Method and system for detecting quality of ink printing surface based on computer vision |
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| DE102018220524A1 (en) | 2019-07-25 |
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