CN115071286A - Automatic adjustment method, device and equipment for emergence template and storage medium - Google Patents

Automatic adjustment method, device and equipment for emergence template and storage medium Download PDF

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Publication number
CN115071286A
CN115071286A CN202110271037.8A CN202110271037A CN115071286A CN 115071286 A CN115071286 A CN 115071286A CN 202110271037 A CN202110271037 A CN 202110271037A CN 115071286 A CN115071286 A CN 115071286A
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data
template
feathering
spray head
color
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CN115071286B (en
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唐涛
陈利洋
黄中琨
陈艳
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Senda Shenzhen Technology Co Ltd
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Senda Shenzhen Technology Co Ltd
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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
    • B41J3/00—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed
    • B41J3/44—Typewriters or selective printing mechanisms having dual functions or combined with, or coupled to, apparatus performing other functions
    • B41J3/445—Printers integrated in other types of apparatus, e.g. printers integrated in cameras
    • 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
    • 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
    • B41J2/14—Structure thereof only for on-demand ink jet 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
    • B41J29/00—Details of, or accessories for, typewriters or selective printing mechanisms not otherwise provided for
    • B41J29/38—Drives, motors, controls or automatic cut-off devices for the entire printing mechanism
    • B41J29/393—Devices for controlling or analysing the entire machine ; Controlling or analysing mechanical parameters involving printing of test patterns
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/12—Digital output to print unit, e.g. line printer, chain printer
    • G06F3/1201—Dedicated interfaces to print systems
    • G06F3/1223—Dedicated interfaces to print systems specifically adapted to use a particular technique
    • G06F3/1237—Print job management
    • G06F3/1242—Image or content composition onto a page
    • G06F3/1243—Variable data printing, e.g. document forms, templates, labels, coupons, advertisements, logos, watermarks, transactional printing, fixed content versioning

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  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Ink Jet (AREA)

Abstract

The invention belongs to the technical field of ink-jet printing, and particularly discloses an automatic adjustment method, device and equipment of a feathering template and a storage medium. The method comprises the following steps: acquiring a first emergence template and a second emergence template; performing feathering processing on the dot matrix data corresponding to the image unit according to the first feathering template and the second feathering template to obtain first dot matrix data and second dot matrix data; printing in the same area according to the first dot matrix data and the second dot matrix data to obtain a printed image; comparing the color depth of the first pixel point and the corresponding position of the printed image to determine an adjustment mode; and adjusting the first data and/or the second data according to the adjusting mode. According to the embodiment of the invention, the printing effect of the spliced sprayer is determined by comparing the color depth of the first pixel point with the color depth of the corresponding position of the printed image, and the corresponding first data and/or second data are/is correspondingly adjusted according to the actual printing effect of the first pixel point, so that the printing effect is optimized.

Description

Automatic adjustment method, device and equipment for emergence template and storage medium
Technical Field
The invention relates to the field of ink-jet printing, in particular to an automatic adjustment method, device and equipment of a feathering template and a storage medium.
Background
Inkjet printing is a printing technique in which ink is ejected in the form of ink droplets by a head onto a printing medium to form a printed image. Therefore, the number of nozzles in the head largely determines the printing efficiency of inkjet printing. The larger the number of nozzles in the head, the larger the number of ink droplets that can be ejected on the printing medium in performing 1 scan printing.
In industrial printing, in order to improve printing efficiency, a plurality of nozzles are generally spliced according to the technical scheme shown in fig. 1 to obtain a spliced nozzle. The head 10 and the head 20 are spliced to form a spliced head 30, and a certain number of overlapped nozzles are arranged between the head 10 and the head 20 in order to keep the distance between the nozzles consistent. As shown in fig. 1, each of the head 10 and the head 20 includes 6 nozzles, 2 nozzles of each head being overlapped with each other, and thus the number of overlapped nozzles is 2. When printing is performed using the tiled ejection head 30, the number of ink droplets that can be ejected at a time is much larger than that when printing is performed using the ejection head 10.
The splicing channels are easy to be formed when the splicing spray head prints, and are also called as yin-yang channels. Because of the existence of the splicing channel, the printing effect is not ideal. Therefore, the prior art provides feathering treatment, so that the printing effect of the spliced spray head is smoother, and the problem of a spliced channel is solved to a certain extent. However, in the feathering processing scheme in the prior art, the feathering template is fixed after being generated, an effective feathering template adjusting method is lacked, and flexible adjustment cannot be made for the printing effect.
Disclosure of Invention
In view of this, embodiments of the present invention provide an automatic adjustment method, apparatus, device and storage medium for an emergence template, so that the emergence template can be flexibly adjusted according to the printing effect of a spliced nozzle, and the printing effect can be further optimized.
In a first aspect, an embodiment of the present invention provides an automatic adjustment method for an emergence template, where the method includes:
s10: acquiring a first emergence template and a second emergence template; the first feathering template and the second feathering template are two-dimensional matrixes with equal sizes, data in the first feathering template is recorded as first data, and data in the second feathering template is recorded as second data;
s20: performing feathering treatment on the dot matrix data corresponding to the image unit in the image to be printed according to the first feathering template and the second feathering template to obtain first dot matrix data and second dot matrix data; recording pixel points in the image units as first pixel points;
s30: controlling a first spray head and a second spray head in the splicing spray head to respectively perform ink-jet printing in the same area of a printing medium according to the first dot matrix data and the second dot matrix data so as to form a printing image; wherein there are at least 1 overlapping nozzle between the first spray head and the second spray head;
s40: comparing the color depth of the first pixel point with the color depth of the corresponding position of the printed image to determine the adjustment mode of the first data and/or the second data corresponding to the first pixel point;
s50: and adjusting the first data and/or the second data according to the adjusting mode.
According to the embodiment of the invention, the image unit and the printing image printed by the splicing spray head are compared in color depth, so that the adjustment mode of the first data and/or the second data corresponding to each first pixel point of the image unit is determined, and the first feathering template and/or the second feathering template are/is flexibly adjusted according to the printing effect of the splicing spray head. Therefore, the adjusted dot matrix data corresponding to the first feathering template and the second feathering template image units are subjected to feathering again to obtain new image dot matrix data, and ink-jet printing is performed according to the new image dot matrix data, so that the printing effect of the spliced nozzle is optimized.
Preferably, the adjusting mode comprises a first adjusting mode and a second adjusting mode; wherein the first adjustment mode comprises modifying 0 to 1, and the second adjustment mode comprises modifying 1 to 0.
The feathering template is generally in the form of a two-dimensional matrix, consisting of two elements, a value of 1 or a value of 0. The feathering processing refers to performing an and operation on the dot matrix data corresponding to the image unit and a feathering template, wherein each data in the dot matrix data is used for representing the ink output of the corresponding nozzle. For example, the corresponding nozzle is characterized by a value of 1 to jet ink, while the corresponding nozzle is characterized by a value of 0 to not jet ink. Therefore, after the feathering process, some of the nozzles will no longer discharge ink, thereby reducing the amount of ink discharge and improving the spliced channel due to the overlapping of ink dots. Further, the embodiment of the present invention improves the color density of the printed image to some extent by modifying 0 in the first feathering template and/or the second feathering template to 1 according to the printing effect. Similarly, the color density of the printed image is further reduced by modifying 1 in the first feathering template and/or the second feathering template to 0. Therefore, according to the embodiment of the invention, the first data/the second data corresponding to each first pixel point can be adjusted according to the printing effect of the spliced nozzle, so that the printing effect of the spliced nozzle is optimized.
Preferably, at S40: the adjusting method of comparing the color shades of the first pixel point and the corresponding position of the printed image to determine the first data and/or the second data corresponding to the first pixel point includes:
s41: controlling a CCD camera to shoot the printed image to obtain a scanned image; recording pixel points in the scanned image as second pixel points;
s42: obtaining the color value of each first pixel point, and recording the color value as a first color value;
s43: obtaining the color value of each second pixel point, and recording the color value as a second color value;
s44: comparing the first color value of the first pixel point with the second color value of the corresponding second pixel point; performing S45 when the first color value is greater than the second color value; performing S46 when the first color value is less than the second color value;
s45: determining that the adjustment mode of the first data and/or the second data corresponding to the first pixel point is a first adjustment mode;
s46: and determining the adjustment mode of the first data and/or the second data corresponding to the first pixel point as a second adjustment mode.
According to the embodiment of the invention, the CCD camera is used for shooting the printed image to obtain the scanned image, the corresponding first color value and the second color value are compared one by one after the color values of all pixel points in the image unit and the scanned image are read, and when the first color value is larger than the second color value, the adjustment mode of the first data and/or the second data corresponding to the first pixel point is determined to be the first adjustment mode, so that the color concentration of the printed image obtained by printing is deepened, and the color effects of the printed image and the image unit are closer. Based on a similar principle, when the first color value is smaller than the second color value, the adjustment mode of the first data and/or the second data corresponding to the first pixel point is determined to be the second adjustment mode, so that the color density of the printed image obtained by printing is reduced, and the color effect of the printed image and the color effect of the image unit are closer.
Preferably, between S43 and S44, the method further comprises:
s431: converting the first color value to a first LAB value;
s432: converting the second color value to a second LAB value;
s433: calculating a color difference delta E between the first pixel point and the second pixel point according to the first LAB value and the second LAB value;
s434: judging the size relation between the color difference delta E and a threshold value; and when the color difference delta E is smaller than the threshold value, the first color value and the second color value corresponding to the color difference delta E are not compared.
In the embodiment of the present invention, by calculating the color difference Δ E between the first pixel point and the second pixel point, when the color difference Δ E is smaller than the threshold, the first color value and the second color value corresponding to the color difference Δ E are not compared, i.e., S45, S46, and S47 are skipped. When the color difference delta E is smaller than the threshold value, the colors of the second pixel point and the first pixel point are considered to be relatively close, namely, the printing effect is good, therefore, the first data and/or the second data corresponding to the first pixel point do not need to be adjusted, the printing effect is ensured, meanwhile, the processing flow is optimized, and the efficiency is improved.
Preferably, at S10: obtaining a first feathering template and a second feathering template, comprising:
s11: determining a number of overlapping nozzles between the first spray head and the second spray head;
s12: generating the first and second feathering templates according to the number of overlapping nozzles.
The splicing passage is mainly caused by the dislocation between the overlapped nozzles, so that the first eclosion template and the second eclosion template do not need to cover the whole first spray head and the whole second spray head but only the overlapped nozzles when the eclosion treatment is carried out. Therefore, the embodiment of the invention generates the first emergence template and the second emergence template according to the number of the overlapped nozzles, so that the number of rows of the first emergence template and the second emergence template is as small as possible, thereby improving the printing efficiency.
Preferably, at S11: determining the number of overlapping nozzles between the first spray head and the second spray head includes:
s111: acquiring the overlapping length L of the first spray head and the second spray head in the nozzle arrangement direction;
s112: acquiring the number P of nozzles included in the unit length of the first nozzle in the nozzle arrangement direction; wherein the number of nozzles included in a unit length of the first and second heads in the nozzle arrangement direction is equal;
s113: determining the number of overlapped nozzles between the first spray head and the second spray head to be L x P.
According to the embodiment of the invention, the overlapping length L of the first spray head and the second spray head in the nozzle arrangement direction and the number P of the nozzles included in the unit length of the first spray head in the nozzle arrangement direction are obtained, so that the number L of the overlapping nozzles between the first spray head and the second spray head is automatically calculated, namely, the first eclosion template and the second eclosion template with corresponding sizes are automatically generated according to the parameters without manual setting, and particularly when the spray heads are installed with errors, the actual overlapping nozzles can be calculated by the technical scheme of the embodiment, so that the printing effect is ensured.
Preferably, at S111: acquiring the overlapping length L of the first spray head and the second spray head in the nozzle arrangement direction, wherein the acquiring comprises the following steps:
s1111: acquiring the projection length of the overlap length L on a first projection plane, and recording as a first projection length Y: wherein the first projection plane is parallel to the print medium;
s1112: acquiring the projection length of the overlap length L on a second projection plane, and recording as a second projection length X; wherein the second projection plane is perpendicular to the print medium and a second projection length X is less than the overlap length L;
s1113: determining that the overlap length L is equal to
Figure BDA0002969794270000051
As described above, there may be some error in mounting the head fixing plate on the printing dolly, resulting in a certain angle of the nozzles with respect to the printing medium, and at this time, it is difficult to directly detect the overlap length L by the related device. The embodiment of the invention determines that the overlap length L is equal to the first projection plane by acquiring the projection length of the overlap length L on the first projection plane and the projection length of the overlap length L on the second projection plane
Figure BDA0002969794270000052
And calculating to obtain the actual number of overlapped nozzles so as to ensure the printing effect. Wherein, first projection length Y accessible grating ruler or scale detect, and second projection length X accessible horizontal scanner detects.
In a second aspect, an embodiment of the present invention provides an apparatus for automatically adjusting an emergence template, where the apparatus includes:
the device comprises an emergence template acquisition module, a first emergence template acquisition module and a second emergence template acquisition module, wherein the emergence template acquisition module is used for acquiring the first emergence template and the second emergence template; the first feathering template and the second feathering template are two-dimensional matrixes with equal sizes, data in the first feathering template is recorded as first data, and data in the second feathering template is recorded as second data;
the feathering module is used for respectively feathering the dot matrix data corresponding to the image unit in the image to be printed according to the first feathering template and the second feathering template so as to obtain first dot matrix data and second dot matrix data; recording pixel points in the image units as first pixel points;
the printing control module is used for controlling a first spray head and a second spray head in the splicing spray head to respectively perform ink-jet printing in the same area of a printing medium according to the first dot matrix data and the second dot matrix data so as to form a printing image; wherein there are at least 1 overlapping nozzle between the first spray head and the second spray head;
the color comparison module is used for comparing the color depth of the first pixel point and the corresponding position of the printed image so as to determine the adjustment mode of the first data and/or the second data corresponding to the first pixel point;
and the data adjusting module is used for adjusting the first data and/or the second data according to the adjusting mode.
In a third aspect, embodiments of the present invention provide a printing apparatus comprising at least one processor, at least one memory and computer program instructions stored in the memory which, when executed by the processor, implement any of the methods of the first aspect.
In a fourth aspect, an embodiment of the present invention provides a storage medium having stored thereon computer program instructions, which when executed by the processor, implement any of the methods of the first aspect.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments of the present invention will be briefly described below, and for those skilled in the art, without any creative effort, other drawings may be obtained according to the drawings, and these drawings are all within the protection scope of the present invention.
FIG. 1 is a schematic view of a tiled spray head.
Fig. 2 is a flowchart illustrating an automatic adjustment method for an emergence template according to an embodiment of the present invention.
Fig. 3 is a schematic flow chart of determining an adjustment manner according to an embodiment of the present invention.
Fig. 4 is a flowchart illustrating another method for automatically adjusting a feathering template according to an embodiment of the present invention.
Fig. 5 is a schematic flow chart of obtaining a feathering template according to an embodiment of the present invention.
Fig. 6 is a schematic flow chart of acquiring the number of overlapped nozzles according to an embodiment of the present invention.
Fig. 7 is a schematic flowchart of acquiring an overlap length according to an embodiment of the present invention.
Fig. 8 is a schematic diagram of obtaining an overlap length according to an embodiment of the present invention.
Fig. 9 is a schematic structural diagram of an automatic adjusting device for an emergence template according to an embodiment of the present invention.
Fig. 10 is a schematic structural diagram of a printing apparatus provided in an embodiment of the present invention.
Detailed Description
Features and exemplary embodiments of various aspects of the present invention will be described in detail below, and in order to make objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention. It will be apparent to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by illustrating examples of the present invention.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
In industrial printing, in order to improve printing efficiency, a plurality of nozzles are generally spliced according to the technical scheme shown in fig. 1 to obtain a spliced nozzle. The head 10 and the head 20 are spliced to form a spliced head 30, and a certain number of overlapped nozzles are arranged between the head 10 and the head 20 in order to keep the distance between the nozzles consistent. As shown in fig. 1, each of the head 10 and the head 20 includes 6 nozzles, 2 nozzles of each head being overlapped with each other, and thus the number of overlapped nozzles is 2. When printing is performed using the tiled ejection head 30, the number of ink droplets that can be ejected at a time is much larger than that when printing is performed using the ejection head 10.
The splicing channels are easy to be formed when the splicing spray head prints, and are also called as yin-yang channels. Because of the existence of the splicing channel, the printing effect is not ideal. Therefore, the prior art provides feathering treatment, so that the printing effect of the spliced spray head is smoother, and the problem of a spliced channel is solved to a certain extent. However, in the feathering processing scheme in the prior art, the feathering template is fixed after being generated, an effective feathering template adjusting method is lacked, and flexible adjustment cannot be made for the printing effect.
In view of the above, embodiments of the present invention provide an automatic adjustment method, apparatus, device and storage medium for a feathering template, so as to solve the above technical problems.
Fig. 2 is a schematic flow chart of an automatic adjustment method for an emergence template according to an embodiment of the present invention, including the following steps.
S10: acquiring a first emergence template and a second emergence template; the first feathering template and the second feathering template are two-dimensional matrixes with equal sizes, data in the first feathering template is recorded as first data, and data in the second feathering template is recorded as second data;
s20: performing feathering treatment on the dot matrix data corresponding to the image unit in the image to be printed according to the first feathering template and the second feathering template to obtain first dot matrix data and second dot matrix data; recording pixel points in the image units as first pixel points;
s30: controlling a first spray head and a second spray head in the splicing spray head to respectively perform ink-jet printing in the same area of a printing medium according to the first dot matrix data and the second dot matrix data so as to form a printing image; wherein there are at least 1 overlapping nozzle between the first spray head and the second spray head;
s40: comparing the color shades of the first pixel points and the corresponding positions of the printed images to determine the adjustment mode of the first data and/or the second data corresponding to the first pixel points;
s50: and adjusting the first data and/or the second data according to the adjusting mode.
Specifically, the feathering template is also called a filtering template, and is generally a two-dimensional matrix, and the elements of the two-dimensional matrix are 0 or 1. The first and second feathering templates are equal in size, which means that the number of rows of the first and second feathering templates is equal and the number of columns of the first and second feathering templates is also equal. In one embodiment, the sum of the first feathering template and the second feathering template acquired at S10 is an all 1 matrix.
The dot matrix data is also called image dot matrix data, print data, and is usually in prt format or prn format. The dot matrix data is also a two-dimensional matrix, and the data is used to characterize the ink discharge amount of the corresponding nozzle. The dot matrix data is obtained by screening the image to be printed. Therefore, the dot matrix data corresponding to the image cell referred to in the present application is dot matrix data obtained by subjecting the image cell to the screen processing. For example, after 1bit screening, the element in the obtained dot matrix data is 0 or 1, wherein 0 is used for representing that the ink output of the corresponding nozzle is 0; 1 is used to characterize that the ink discharge amount of the corresponding nozzle is not 0. For example, after 2bit screening, the elements in the obtained dot matrix data are 00, 01, 10 and 11, wherein 00 is used for representing that the ink output of the corresponding nozzle is 0; 01 is used to characterize the ink output of the corresponding nozzle as a small ink amount (e.g., 25%); 10 is used to characterize the ink output of the corresponding nozzle as a medium ink (e.g., 50%); 11 are used to characterize the ink output of the corresponding nozzle as a large ink quantity (e.g., 100%).
The eclosion processing refers to performing an AND operation on the eclosion template and the dot matrix data. Specifically, the first feathering template and the dot matrix data are feathered to obtain first dot matrix data; and performing feathering treatment on the second feathering template and the dot matrix data to obtain second dot matrix data. The first data corresponding to the first pixel point referred to in this application is first data obtained by performing an and operation with data obtained by screening the first pixel point when performing the feathering process. Similarly, the second data corresponding to the first pixel point referred to in this application refers to the second data that is subjected to the and operation with the data obtained by the screening processing of the first pixel point when the feathering processing is performed.
For ease of understanding, reference is made to FIG. 1. The tiled spray head 30 includes a first spray head 10 and a second spray head 20. It should be noted that the number of the nozzles in the spliced nozzle is not limited to 2, but may be n, where n is a positive integer greater than or equal to 2.
In printing, the overlapping nozzles of the first and second heads 10 and 20 eject ink in the same printing area every time the tiled inkjet head 30 performs 1 scan printing. Thus, the printed image referred to herein is formed by overlapping nozzle printing.
The current printing modes can be mainly classified into 3 types, namely, multi-Pass scan printing, single-Pass scan printing and Onepass printing. The multi-Pass scanning printing means that each unit of an image to be printed can be printed only by performing interpolation for multiple times, each unit consists of a plurality of pixel points, if 2-Pass scanning printing is performed, each unit consists of 2 pixel points, and if 3-Pass scanning printing is performed, each unit consists of 3 pixel points. The single Pass scanning printing means that each unit of the image to be printed can be printed by only one scanning. The multi-nozzle side-by-side scanning printing is also called Oneepass printing, and the Oneepass printing refers to finishing printing an image to be printed at one time. Oneeglass printing has the advantages of high efficiency and large output, and is suitable for a large-batch and continuous production mode. Executing one-scan printing in the present application refers to performing printing of one Pass. If the Oneepass printing is carried out, the one-time scanning printing indicates that the sprayer completes the process of printing the image by one-time scanning.
The image unit is composed of first pixel points, and the pixel points comprise color values. For example, in the CMYK mode, the color value of a pixel includes color values of 4 channels, namely, color values of a Cyan channel (Cyan), a Magenta channel (Magenta), a Yellow channel (Yellow), and a Black channel (Black), and the color of the pixel is determined by the 4 pixel values. Similarly, in the RGB mode, the color values of the pixels include color values of 3 channels, namely, a Red channel (Red), a Green channel (Green), and a Blue channel (Blue). Of course, in some embodiments of the present invention, the shade of color may also be represented in grayscale.
As mentioned above, the printed image is obtained by printing the image unit, that is, each pixel point of the image unit corresponds to an ink dot in the printed image. Therefore, the print image corresponding position referred to in this application refers to an ink dot on the print medium for representing the corresponding first pixel point.
Comparing shades may compare color values or grayscale values. For example, in CMYK mode, the higher the color value, the darker the color is considered. Alternatively, the higher the grayscale value, the darker the color is considered. Taking the CMYK mode as an example, it should be particularly noted that, since the stitching channel is caused by overlapping or leaving out ink dots, when the color of the first pixel point is darker than the color of the corresponding position of the printed image, the color values of the 4 channels are often all larger than the corresponding position of the printed image. Similarly, when the color of the first pixel point is lighter than the color of the corresponding position of the printed image, the color values of the 4 channels are always smaller than the corresponding position of the printed image. Thus, in the comparison, the color values of any one color channel may be selected for comparison. Of course, the color values of all channels may also be compared. In one embodiment of the present invention, the color values of the 4 channels are summed and then compared.
After comparing the color shades to determine an adjustment mode, the first data and/or the second data can be adjusted according to the adjustment mode. According to the embodiment of the invention, the image unit and the printing image printed by the splicing spray head are compared in color depth, so that the adjustment mode of the first data and/or the second data corresponding to each first pixel point of the image unit is determined, and the first feathering template and/or the second feathering template are/is flexibly adjusted according to the printing effect of the splicing spray head. Therefore, the adjusted dot matrix data corresponding to the first feathering template and the second feathering template image units are subjected to feathering again to obtain new image dot matrix data, and ink-jet printing is performed according to the new image dot matrix data, so that the printing effect of the spliced nozzle is optimized.
In one embodiment of the present invention, the adjustment manner includes a first adjustment manner and a second adjustment manner; wherein the first adjustment mode comprises modifying 0 to 1, and the second adjustment mode comprises modifying 1 to 0. Specifically, when the adjustment mode of one of the first data is determined to be the first adjustment mode, the adjustment mode is modified to 1, and obviously, if the first data is already 1, no adjustment is performed. Similarly, when the adjustment mode of one of the first data is determined to be the second adjustment mode, the adjustment mode is modified to 0, and obviously, if the first data is already 0, no adjustment is performed. The second data is adjusted in the same way as described above, and it is not further elaborated here.
Fig. 3 is a schematic flow chart of a method for comparing color shades according to an embodiment of the present invention, which includes the following steps.
S41: controlling a CCD camera to shoot the printed image to obtain a scanned image; recording pixel points in the scanned image as second pixel points;
s42: obtaining the color value of each first pixel point, and recording the color value as a first color value;
s43: obtaining the color value of each second pixel point, and recording the color value as a second color value;
s44: comparing the first color value of the first pixel point with the second color value of the corresponding second pixel point; performing S45 when the first color value is greater than the second color value; performing S46 when the first color value is less than the second color value;
s45: determining that the adjustment mode of the first data and/or the second data corresponding to the first pixel point is a first adjustment mode;
s46: and determining the adjustment mode of the first data and/or the second data corresponding to the first pixel point as a second adjustment mode.
Specifically, the splicing spray head is arranged on a bottom plate, wherein the bottom plate is also called a spray head fixing plate, and the bottom plate is fixed on the printing trolley so as to move along with the printing trolley. In order to allow the CCD camera to photograph the entire printing medium, the CCD camera may be mounted on the base plate or on the printing carriage in one embodiment of the present invention. The CCD camera is a charge coupled device (charged coupled device) that can convert a print image into a scan image, facilitating color shade comparison. Of course, those skilled in the art will readily appreciate that a device having a similar function may be substituted for the CCD camera to achieve the same technical effect.
Therefore, when comparing the color depth, the color values of the first pixel point and the second pixel point can be read. For example, the CMYK values of the first pixel point and the second pixel point are read, and then the color values are compared.
As previously mentioned, in one embodiment of the present invention, any color channel may be selected for comparison of color values. For example, the color value of the cyan channel is selected for comparison (i.e., the C values of the first pixel and the second pixel are compared). In another embodiment of the present invention, color values of four color channels may be summed and compared, that is, the sum of the C value, the M value, the Y value, and the K value of the first pixel point is compared with the sum of the C value, the M value, the Y value, and the K value of the second pixel point. In another embodiment of the present invention, color values of 4 color channels may be compared, and the color channel with the largest difference value is used as the determination standard of the adjustment mode.
It should be noted that, since the scanned image is obtained by shooting the print image, the print image is obtained based on the image unit. Therefore, the scanned image and the pixel points of the image unit have a one-to-one correspondence relationship.
Because the color reduction of the existing ink is difficult to be accurate, a printed image and an image unit which are obtained by printing have certain color difference even if no splicing channel exists, and when the splicing channel exists, the color difference between the splicing channel and the image unit is larger. Therefore, in another embodiment of the present invention, when the color difference between the first pixel point and the second pixel point is larger, the first data and/or the second data corresponding to the first pixel point are/is adjusted. Specifically, please refer to fig. 4, which includes the following steps.
S431: converting the first color value to a first LAB value;
s432: converting the second color value to a second LAB value;
s433: calculating a color difference delta E between the first pixel point and the second pixel point according to the first LAB value and the second LAB value;
s434: judging the size relation between the color difference delta E and a threshold value; and when the color difference delta E is smaller than the threshold value, the first color value and the second color value corresponding to the color difference delta E are not compared.
Specifically, the CMYK mode is exemplified. After the color value of the first color point is read, it can be converted to an LAB value by a specific algorithm. Wherein L represents luminance; the positive number of A represents red, and the negative number represents green; a positive number for B represents yellow and a negative number represents blue. The conversion of CMYK values into LAB values is state of the art and will not be overruled here. Similarly, the second color value can also be converted to a second LAB value.
The color difference delta E can be calculated based on the LAB value, and the calculation formula can be adopted according to the formula
Figure BDA0002969794270000131
Wherein L is 1 、A 1 、B 1 Represents a first LAB value; l is 2 、A 2 、B 2 A second LAB value is indicated. For example, the first LABs are each L 1 ＝70，A 1 ＝55，B 1 50; the second LAB values are respectively L 2 ＝75，A 2 ＝50，B 2 The color difference Δ E is about 12.25 at 40.
In one embodiment of the invention, the external input is obtained as the threshold in response to the external input. In a preferred embodiment of the invention, the threshold value is 1.5. When the color difference is less than 1, the human eye can hardly recognize the difference in color, and when the color difference is between 1 and 2, the human eye can only recognize it minutely. Therefore, setting the threshold to 1.5 can better ensure that the color difference falls within the normal range.
It should be noted that the color difference Δ E is calculated by the first pixel and the second pixel, and the color value of the first pixel is the first color value and the color value of the second pixel is the second color value. Therefore, the first color value and the second color value corresponding to the color difference Δ E are not compared, which is equivalent to that the first data and/or the second data corresponding to the first pixel point are not adjusted.
Fig. 5 is a schematic flow chart of a method for obtaining a feathering template according to an embodiment of the present invention, which includes the following steps.
S11: determining a number of overlapping nozzles between the first spray head and the second spray head;
s12: generating the first and second feathering templates according to the number of overlapping nozzles.
Specifically, for ease of understanding, referring to fig. 1, the head 10 and the head 20 are spliced to form a spliced head 30, and a certain number of overlapping nozzles are formed between the head 10 and the head 20 in order to maintain the uniform nozzle pitch. Each of the head 10 and the head 20 includes 6 nozzles, 2 nozzles of each head being overlapped with each other, so that the number of overlapped nozzles is 2.
As mentioned above, the splice channel is mainly caused by the splicing of the nozzles, so the size of the eclosion template only needs to cover the overlapped nozzles. The first feathering template and the second feathering template which only cover the overlapped nozzles are adopted, so that when the printing is executed, additional interpolation is not required due to the feathering at this time, and the printing efficiency is ensured.
For example, if the number of overlapping nozzles is 2, the number of rows of the first and second feathering templates may be 2.
Fig. 6 is a schematic flow chart of a method for automatically calculating the number of overlapped nozzles according to an embodiment of the present invention, including the following steps.
S111: acquiring the overlapping length L of the first spray head and the second spray head in the nozzle arrangement direction;
s112: acquiring the number P of nozzles included in the unit length of the first nozzle in the nozzle arrangement direction; wherein the number of nozzles included in a unit length of the first and second heads in the nozzle arrangement direction is equal;
s113: determining the number of overlapped nozzles between the first spray head and the second spray head to be L x P.
For example, the overlap length L of the first head and the second head in the nozzle arrangement direction is 0.5 inch, and the first head includes 1 row of nozzles including 100 nozzles per inch; the second head included 1 row of nozzles, which included 100 nozzles per inch. Therefore, the number of overlapping nozzles is 50. And when L is not an integer, rounding up.
In particular, the head may include a plurality of rows of nozzles, and the number P of nozzles included per unit length in the nozzle arrangement direction referred to in the present application means the number of nozzles included in 1 row of nozzles per unit length.
When the bottom plate is installed in the printing trolley, installation errors possibly exist, a certain included angle exists between the splicing spray head and the printing medium, and the overlapping length L is difficult to directly detect at the moment. Therefore, in one embodiment of the present invention, the calculation of the overlap length L using the solution shown in fig. 7 includes the following steps.
S1111: acquiring the projection length of the overlap length L on a first projection plane, and recording as a first projection length Y: wherein the first projection plane is parallel to the print medium;
s1112: acquiring the projection length of the overlap length L on a second projection plane, and recording as a second projection length X; wherein the second projection plane is perpendicular to the print medium and a second projection length X is less than the overlap length L;
s1113: determining that the overlap length L is equal to
Figure BDA0002969794270000151
For ease of understanding, referring to fig. 8, the first projection plane 40 is parallel to the print medium and the second projection plane 50 is perpendicular to the print medium. The projection length of the overlap length L on the first projection plane 40 is Y, and the projection length of the overlap length L on the second projection plane 50 is X, so that
Figure BDA0002969794270000152
The overlap length L is obtained. The projection length Y can be detected by a first distance detecting component, such as a grating scale or a graduated scale. Because the printing equipment is provided with the grating ruler and the grating decoder, the printing trolley can be controlled to move during measurement, so that the grating decoder is sequentially positioned at the point a and the point b, and the projection length Y can be determined according to the grating value obtained by 2 times of reading. The projection length X may be detected using a second distance detection means, such as a horizontal scanner. The horizontal scanner can be installed on the ink stack, and respectively detects the heights of the points a and c and the height between the points a and c during measurementThe height difference is the projection length Y.
Referring to fig. 9, an embodiment of the present invention further provides an apparatus for automatically adjusting an eclosion template, where the apparatus includes:
the device comprises an emergence template acquisition module, a first emergence template acquisition module and a second emergence template acquisition module, wherein the emergence template acquisition module is used for acquiring the first emergence template and the second emergence template; the first feathering template and the second feathering template are two-dimensional matrixes with equal sizes, data in the first feathering template is recorded as first data, and data in the second feathering template is recorded as second data;
the feathering module is used for respectively feathering the dot matrix data corresponding to the image unit in the image to be printed according to the first feathering template and the second feathering template so as to obtain first dot matrix data and second dot matrix data; recording pixel points in the image units as first pixel points;
the printing control module is used for controlling a first spray head and a second spray head in the splicing spray head to respectively perform ink-jet printing in the same area of a printing medium according to the first dot matrix data and the second dot matrix data so as to form a printing image; wherein there are at least 1 overlapping nozzle between the first spray head and the second spray head;
the color comparison module is used for comparing the color depth of the first pixel point and the corresponding position of the printed image so as to determine the adjustment mode of the first data and/or the second data corresponding to the first pixel point;
and the data adjusting module is used for adjusting the first data and/or the second data according to the adjusting mode.
In another embodiment of the present invention, the apparatus further comprises:
the shooting control module is used for controlling the CCD camera to shoot the printing image to obtain a scanning image; recording pixel points in the scanned image as second pixel points;
the first color value acquisition module is used for acquiring the color value of each first pixel point and recording the color value as a first color value;
the second color value acquisition module is used for acquiring the color value of each second pixel point and recording the color value as a second color value;
the judging module is used for comparing the first color value of the first pixel point with the second color value of the corresponding second pixel point; the judging module is further configured to select a first adjustment mode determining module to execute when the first color value is greater than the second color value, and the judging module is further configured to select a second adjustment mode determining module to execute when the first color value is less than the second color value;
the first adjustment mode determining module is used for determining that the adjustment mode of the first data and/or the second data corresponding to the first pixel point is a first adjustment mode;
the second adjustment mode determining module is used for determining that the adjustment mode of the first data and/or the second data corresponding to the first pixel point is the second adjustment mode.
In addition, the automatic adjustment method of the feathering template of the embodiment of the present invention may be implemented by a printing apparatus. Fig. 10 is a schematic diagram illustrating a hardware configuration of a printing apparatus according to an embodiment of the present invention.
The printing device may include a processor and a memory storing computer program instructions.
In particular, the processor may include a Central Processing Unit (CPU), or an Application Specific Integrated Circuit (ASIC), or one or more Integrated circuits that may be configured to implement embodiments of the present invention.
The memory may include mass storage for data or instructions. By way of example, and not limitation, memory may include a Hard Disk Drive (HDD), floppy Disk Drive, flash memory, optical Disk, magneto-optical Disk, magnetic tape, or Universal Serial Bus (USB) Drive or a combination of two or more of these. The memory may include removable or non-removable (or fixed) media, where appropriate. The memory may be internal or external to the data processing apparatus, where appropriate. In a particular embodiment, the memory is non-volatile solid-state memory. In a particular embodiment, the memory includes Read Only Memory (ROM). Where appropriate, the ROM may be mask-programmed ROM, Programmable ROM (PROM), Erasable PROM (EPROM), Electrically Erasable PROM (EEPROM), electrically rewritable ROM (EAROM), or flash memory or a combination of two or more of these.
The processor reads and executes the computer program instructions stored in the memory to implement the automatic adjustment method of the feathering template in any of the above embodiments.
In one example, the printing device may also include a communication interface and a bus. As shown in fig. 10, the processor, the memory, and the communication interface are connected by a bus to complete communication therebetween.
The communication interface is mainly used for realizing communication among modules, devices, units and/or equipment in the embodiment of the invention.
The bus includes hardware, software, or both that couple the components of the printing device to one another. By way of example, and not limitation, a bus may include an Accelerated Graphics Port (AGP) or other graphics bus, an Enhanced Industry Standard Architecture (EISA) bus, a Front Side Bus (FSB), a Hypertransport (HT) interconnect, an Industry Standard Architecture (ISA) bus, an infiniband interconnect, a Low Pin Count (LPC) bus, a memory bus, a Micro Channel Architecture (MCA) bus, a Peripheral Component Interconnect (PCI) bus, a PCI-Express (PCI-X) bus, a Serial Advanced Technology Attachment (SATA) bus, a video electronics standards association local (VLB) bus, or other suitable bus or a combination of two or more of these. A bus may include one or more buses, where appropriate. Although specific buses have been described and shown in the embodiments of the invention, any suitable buses or interconnects are contemplated by the invention.
In addition, in combination with the automatic adjustment method for the feathering template in the foregoing embodiment, an embodiment of the present invention may provide a computer-readable storage medium to implement the method. The computer readable storage medium having stored thereon computer program instructions; the computer program instructions, when executed by a processor, implement the method of automatic adjustment of a feathering template of any of the above embodiments.
It is to be understood that the invention is not limited to the specific arrangements and instrumentality described above and shown in the drawings. A detailed description of known methods is omitted herein for the sake of brevity. In the above embodiments, several specific steps are described and shown as examples. However, the method processes of the present invention are not limited to the specific steps described and illustrated, and those skilled in the art can make various changes, modifications and additions or change the order between the steps after comprehending the spirit of the present invention.
The functional blocks shown in the above-described structural block diagrams may be implemented as hardware, software, firmware, or a combination thereof. When implemented in hardware, it may be, for example, an electronic circuit, an Application Specific Integrated Circuit (ASIC), suitable firmware, plug-in, function card, or the like. When implemented in software, the elements of the invention are the programs or code segments used to perform the required tasks. The program or code segments can be stored in a machine-readable medium or transmitted by a data signal carried in a carrier wave over a transmission medium or a communication link. A "machine-readable medium" may include any medium that can store or transfer information. Examples of a machine-readable medium include electronic circuits, semiconductor memory devices, ROM, flash memory, Erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, fiber optic media, Radio Frequency (RF) links, and so forth. The code segments may be downloaded via computer networks such as the internet, intranet, etc.
It should also be noted that the exemplary embodiments mentioned in this patent describe some methods or systems based on a series of steps or devices. However, the present invention is not limited to the order of the above-described steps, that is, the steps may be performed in the order mentioned in the embodiments, may be performed in an order different from the order in the embodiments, or may be performed simultaneously.
As described above, only the specific embodiments of the present invention are provided, and it can be clearly understood by those skilled in the art that, for convenience and simplicity of description, the specific working processes of the system, the module and the unit described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again. It should be understood that the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive various equivalent modifications or substitutions within the technical scope of the present invention, and these modifications or substitutions should be covered within the scope of the present invention.

Claims (10)

1. A method for automatic adjustment of a feathering template, the method comprising:
s10: acquiring a first emergence template and a second emergence template; the first feathering template and the second feathering template are two-dimensional matrixes with equal sizes, data in the first feathering template is recorded as first data, and data in the second feathering template is recorded as second data;
s20: performing feathering treatment on the dot matrix data corresponding to the image unit in the image to be printed according to the first feathering template and the second feathering template to obtain first dot matrix data and second dot matrix data; recording pixel points in the image units as first pixel points;
s30: controlling a first spray head and a second spray head in the splicing spray head to respectively perform ink-jet printing in the same area of a printing medium according to the first dot matrix data and the second dot matrix data so as to form a printing image; wherein there are at least 1 overlapping nozzle between the first spray head and the second spray head;
s40: comparing the color depth of the first pixel point with the color depth of the corresponding position of the printed image to determine the adjustment mode of the first data and/or the second data corresponding to the first pixel point;
s50: and adjusting the first data and/or the second data according to the adjusting mode.
2. The method of claim 1, wherein the adjustment manner comprises a first adjustment manner and a second adjustment manner; wherein the first adjustment mode comprises modifying 0 to 1, and the second adjustment mode comprises modifying 1 to 0.
3. The method of claim 2, wherein at S40: comparing the color depth of the first pixel point and the corresponding position of the printing image to determine the adjustment mode of the first data and/or the second data corresponding to the first pixel point, including:
s41: controlling a CCD camera to shoot the printed image to obtain a scanned image; recording pixel points in the scanned image as second pixel points;
s42: obtaining the color value of each first pixel point, and recording the color value as a first color value;
s43: obtaining the color value of each second pixel point, and recording the color value as a second color value;
s44: comparing the first color value of the first pixel point with the second color value of the corresponding second pixel point; performing S45 when the first color value is greater than the second color value; performing S46 when the first color value is less than the second color value;
s45: determining that the adjustment mode of the first data and/or the second data corresponding to the first pixel point is a first adjustment mode;
s46: and determining the adjustment mode of the first data and/or the second data corresponding to the first pixel point as a second adjustment mode.
4. The method of claim 3, wherein between S43 and S44, the method further comprises:
s431: converting the first color value to a first LAB value;
s432: converting the second color value to a second LAB value;
s433: calculating a color difference delta E between the first pixel point and the second pixel point according to the first LAB value and the second LAB value;
s434: judging the size relation between the color difference delta E and a threshold value; and when the color difference delta E is smaller than the threshold value, the first color value and the second color value corresponding to the color difference delta E are not compared.
5. The method of claim 1, wherein at S10: obtaining a first feathering template and a second feathering template, comprising:
s11: determining a number of overlapping nozzles between the first spray head and the second spray head;
s12: generating the first and second feathering templates according to the number of overlapping nozzles.
6. The method of claim 5, wherein at S11: determining the number of overlapping nozzles between the first spray head and the second spray head includes:
s111: acquiring the overlapping length L of the first spray head and the second spray head in the nozzle arrangement direction;
s112: acquiring the number P of nozzles included in the unit length of the first nozzle in the nozzle arrangement direction; wherein the number of nozzles included in a unit length of the first and second heads in the nozzle arrangement direction is equal;
s113: determining the number of overlapped nozzles between the first spray head and the second spray head to be L x P.
7. The method of claim 6, wherein at S111: acquiring the overlapping length L of the first spray head and the second spray head in the nozzle arrangement direction, wherein the acquiring comprises the following steps:
s1111: acquiring the projection length of the overlapping length L on a first projection plane, and recording as a first projection length Y: wherein the first projection plane is parallel to the print medium;
s1112: acquiring the projection length of the overlap length L on a second projection plane, and recording as a second projection length X; wherein the second projection plane is perpendicular to the print medium and a second projection length X is less than the overlap length L;
s1113: determining that the overlap length L is equal to
Figure FDA0002969794260000031
8. An apparatus for automatically adjusting an emergence template, the apparatus comprising:
the eclosion template acquisition module is used for acquiring a first eclosion template and a second eclosion template; the first feathering template and the second feathering template are two-dimensional matrixes with equal sizes, data in the first feathering template is recorded as first data, and data in the second feathering template is recorded as second data;
the feathering module is used for respectively feathering the dot matrix data corresponding to the image unit in the image to be printed according to the first feathering template and the second feathering template so as to obtain first dot matrix data and second dot matrix data; recording pixel points in the image units as first pixel points;
the printing control module is used for controlling a first spray head and a second spray head in the splicing spray head to respectively perform ink-jet printing in the same area of a printing medium according to the first dot matrix data and the second dot matrix data so as to form a printing image; wherein there are at least 1 overlapping nozzle between the first spray head and the second spray head;
the color comparison module is used for comparing the color depth of the first pixel point and the corresponding position of the printed image so as to determine the adjustment mode of the first data and/or the second data corresponding to the first pixel point;
and the data adjusting module is used for adjusting the first data and/or the second data according to the adjusting mode.
9. A printing apparatus, comprising: at least one processor, at least one memory, and computer program instructions stored in the memory, which when executed by the processor, implement the method of any one of claims 1-7.
10. A storage medium having computer program instructions stored thereon, which when executed by a processor implement the method of any one of claims 1-7.
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