CN117162666A - Method, device, system and storage medium for spherical surface ink-jet printing - Google Patents
Method, device, system and storage medium for spherical surface ink-jet printing Download PDFInfo
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- CN117162666A CN117162666A CN202311254641.5A CN202311254641A CN117162666A CN 117162666 A CN117162666 A CN 117162666A CN 202311254641 A CN202311254641 A CN 202311254641A CN 117162666 A CN117162666 A CN 117162666A
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- 238000007641 inkjet printing Methods 0.000 title claims abstract description 65
- 238000000034 method Methods 0.000 title claims abstract description 38
- 238000007639 printing Methods 0.000 claims abstract description 91
- 239000003086 colorant Substances 0.000 claims abstract description 15
- 239000007921 spray Substances 0.000 claims abstract description 6
- 239000013598 vector Substances 0.000 claims description 21
- 230000000007 visual effect Effects 0.000 claims description 10
- 230000007704 transition Effects 0.000 claims description 9
- 238000004364 calculation method Methods 0.000 claims description 8
- 238000004590 computer program Methods 0.000 claims description 8
- 238000013507 mapping Methods 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 5
- 230000008859 change Effects 0.000 claims description 2
- 230000006870 function Effects 0.000 description 14
- 239000000049 pigment Substances 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000000123 paper Substances 0.000 description 1
- 238000007650 screen-printing Methods 0.000 description 1
- 238000007592 spray painting technique Methods 0.000 description 1
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- Ink Jet (AREA)
Abstract
The application relates to the technical field of ink-jet printing, in particular to a method, a device, a system and a storage medium for spherical surface ink-jet printing. The ball sucking pillar sucks a ball first, moves to the printing position of the first printing head, starts rotating the pillar for a plurality of circles, uniformly sprays ink on the surface of the ball, moves the printing position of the second printing head only, repeats the steps until all printing colors are finished, moves away and releases the ball after starting rotating the pillar for a plurality of circles, and performs ink-jet printing on the next ball. The ink jet is more uniform, and the adopted automatic assembly line mode is used for sucking the balls, so that the balls can be automatically positioned for rotary printing. Not only can the customization of the product be completed, but also the automation of producing the product can be improved.
Description
Technical Field
The application relates to the technical field of ink-jet printing, in particular to a method, a device, a system and a storage medium for spherical surface ink-jet printing.
Background
Current inkjet printing is primarily printing on planar print media, such as: paper, brick, cloth, board, etc. And placing the printing medium on a printing platform of a printer, and then performing ink-jet printing on the printing medium by using a spray head to finish a printing task. Common inkjet printing is a flat panel printer.
The flat panel printers are classified into one-pass printing and shuttle printing according to the relationship between motion and printing. The single-stroke printing is that when the nozzle performs reciprocating linear motion along the printing beam, ink is only discharged in one direction, and ink is not discharged in the other direction, for example: when the nozzle is far away from the initial printing position, ink jet printing is carried out, and ink is not ejected in the process of returning to the initial printing position. The reciprocating printing is that when the spray head moves back and forth on the printing cross beam, the spray head performs ink-jet printing in the process of being far away from the printing initial position and being close to the printing initial position.
In the prior art, special RIP software is required for image conversion of spherical digital printing, the special RIP software is not used for ordinary image conversion, and a certain relation is provided between the RIP software and the diameter and the printing width of the spherical, so that the operation difficulty of the digital printing of the spherical is increased for operators, and at present, only the spherical can be printed, and errors exist for the spherical in oval series, so that a method, a device, equipment and a storage medium for spherical surface ink-jet printing are needed to solve the problems.
Disclosure of Invention
The present application is directed to methods, apparatus, devices and storage media for inkjet printing on spherical surfaces that address one or more of the problems of the prior art, and at least provide a useful choice or creation of conditions.
A method of spherical surface inkjet printing, the method comprising the steps of:
the ball sucking pillar sucks a ball first, moves to the printing position of the first printing head, starts rotating the pillar for a plurality of circles, uniformly sprays ink on the surface of the ball, moves the printing position of the second printing head only, repeats the steps until all printing colors are finished, moves away and releases the ball after starting rotating the pillar for a plurality of circles, and performs ink-jet printing on the next ball.
Further, the ink-jet printing sphere comprises a plurality of printing heads, the printing heads are different in ink-jet printing colors, a visual sensor is arranged on each printing head, the surface of the sphere is shot, the surface image of the sphere is obtained, the image data of the surface image of the sphere is integrated, a three-dimensional sphere model is built, the shape of the three-dimensional sphere model is analyzed, the printing pattern is mapped into the three-dimensional sphere model, a printing preview image is generated, and the ink-jet printing is carried out according to the shape of the sphere.
Further, when the printing pattern is mapped on the three-dimensional sphere model, uneven distribution of pixel points occurs, the pixel points are uniformly mapped in the sphere model by adjusting, so that the printing pattern distortion can not be generated in the inkjet printing of the pixel points on the surface of the sphere, and the method for adjusting the pixel points to be uniformly mapped in the sphere model comprises the following steps:
s1: after the printing pattern is mapped on the surface of the sphere, whether a convex or concave printing error point exists on the surface of the sphere or not is analyzed, pixel point coordinates of a three-dimensional sphere model are analyzed, a pixel point sitting mark is B (x, y and z), coordinate positions of the pixel point B and adjacent pixel points are analyzed, a reasonable range of the distance of the coordinate positions among the pixel points is calculated according to a difference formula: λ=exp (B (x, y, z) -Bt (xt, yt, zt)) 2 Wherein λ is a transition coefficient, exp () is an exponential function, and (B (x, y, z) -Bt (xt, yt, zt)) 2 The coordinate variance of the pixel point B and the adjacent pixel point Bt;
s2: comparing according to the transition coefficient brought into the coordinate point, determining a region with larger printing error points, selecting a second adjacent pixel point Bt1, wherein the second adjacent pixel point represents a pixel point adjacent to the adjacent pixel point Bt, and meanwhile, the second adjacent pixel point Bt and a pixel point B are on the same line, selecting a third adjacent pixel point Bt2, continuously calculating the transition coefficient, continuously diffusing the position of the pixel point to a region far away from the pixel point B along with the increase of iterative calculation times, judging the specific position of the region with difference, and constructing the change of the loss function calculation in the iterative calculation process:
wherein σ is a loss function, when the loss function is increased by determining which region the pixel point is in, there is a print error point in that region, B0 is represented as taking the original pixel point, B (x, y, z) is a variable, traversing B0-Btn, btn is the n-1 th adjacent pixelThe point, λ, is here a variable, which, as the pixel point changes,representing gradient operator, judging by sigma, ifThe pixel is not distorted, ifWhen the pixel points are distorted, wherein λmin (B) is the minimum traversed inter-pixel point distance.
Further, after judging that the pixel points on the surface of the sphere are distorted, adjusting the printing pattern according to the distortion degree, and deriving a vector field from a graph in the three-dimensional sphere model, wherein the vector field refers to a set formed by m×n vectors, m×n represents the size of the three-dimensional sphere model, namely the number of pixels in the three-dimensional sphere model, and the vector field is characterized in that all the vectors in the vector field point to a target point, and according to the distortion degree, judging the offset adjustment direction of the inkjet pixel points, and obtaining the direction and offset distance of the vectors by solving the following Euler equation:
and the offset direction and the offset distance of the pixel point mapping of the ink-jet printing image can be determined according to the offset distance and the offset angle, and the mapping of the ink-jet printing image is adjusted.
Further, the plurality of printing heads pair a plurality of colors respectively, RGB values of the images are extracted from the ink-jet printed images, the colors are proportioned in the printing heads to obtain the same color system color distribution, so that the ink-jet pipelining can be realized, the ink-jet printing heads are rotated to jet ink, and the ink is uniformly printed on the surface of the sphere.
Further, a spherical surface inkjet printing apparatus, the apparatus comprising: the visual sensor, the print head, the suction ball rotary support column and the ball running track.
The device has the functions of:
visual sensor: the device is arranged on the printing head and mainly used for acquiring the surface image of the sphere to be printed;
a print head: the printing head stores pigments of various colors, and performs ink-jet printing according to the color of the pigment sprayed by the system control;
suction ball rotating support column: the ball printing device is responsible for sucking a ball to be printed, rotating, and simultaneously acquiring images by matching with a visual sensor and performing ink-jet printing by matching with a printing head;
sphere running rail: the rotary support is mainly used for sucking balls to translate, and the printing head is replaced to jet ink.
Further, a spherical surface inkjet printing system, the system comprising: an image acquisition system, a data processing system, a computer program executable on the data processing system, the data processing system implementing a method of inkjet printing of any of the spherical surfaces of the above methods when the computer program is executed.
The system comprises:
image acquisition system: acquiring images of the surface of the sphere by using an industrial area array camera, and collecting images of each position of the sphere completely according to the rotation of the surface of the sphere;
a data processing system: the method is used for acquiring the sphere surface image and data and processing the sphere surface image and data.
Further, a computer readable storage medium having stored thereon computer instructions which, when executed by a processor, implement a method as claimed in any one of the above methods.
The beneficial effects of the application are as follows: the ink jet is more uniform, and the adopted automatic assembly line mode is used for sucking the balls, so that the balls can be automatically positioned for rotary printing. Not only can the customization of the product be completed, but also the automation of producing the product can be improved.
Drawings
The above and other features of the present application will become more apparent from the detailed description of the embodiments thereof given in conjunction with the accompanying drawings, in which like reference characters designate like or similar elements, it is evident that the drawings in the following description are merely examples of the present application, and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art, in which
In the figure:
FIG. 1 is a flow chart of a method of spherical surface inkjet printing;
fig. 2 is a block diagram of a spherical surface ink jet printing system.
Detailed Description
The conception, specific structure, and technical effects produced by the present application will be clearly and completely described below with reference to the embodiments and the drawings to fully understand the objects, aspects, and effects of the present application. It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other.
The defects of the prior art are as follows:
sphere ink jet printing is common in screen printing. This solution is only suitable for fixed patterns and mass printing. Not suitable for changing patterns.
Some spheres are printed by digital spray painting with fixed spheres, and ink-jet printing is performed by taking spheres as a plane.
The defects are adjusted by the following method:
a method of spherical surface inkjet printing, the method comprising the steps of:
as shown in figure 1, the ball sucking column sucks one ball, moves to the printing position of the first printing head, starts rotating the column for a plurality of circles, uniformly jets ink on the surface of the ball, moves the printing position of the second printing head, repeats the steps until all printing colors are finished, removes and releases the printing ball after starting rotating the column for a plurality of circles, and performs ink jet printing on the next ball.
Further, the ink-jet printing sphere comprises a plurality of printing heads, the printing heads are different in ink-jet printing colors, a visual sensor is arranged on each printing head, the surface of the sphere is shot, the surface image of the sphere is obtained, the image data of the surface image of the sphere is integrated, a three-dimensional sphere model is built, the shape of the three-dimensional sphere model is analyzed, the printing pattern is mapped into the three-dimensional sphere model, a printing preview image is generated, and the ink-jet printing is carried out according to the shape of the sphere.
Further, when the printing pattern is mapped on the three-dimensional sphere model, uneven distribution of pixel points occurs, the pixel points are uniformly mapped in the sphere model by adjusting, so that the printing pattern distortion can not be generated in the inkjet printing of the pixel points on the surface of the sphere, and the method for adjusting the pixel points to be uniformly mapped in the sphere model comprises the following steps:
s1: after the printing pattern is mapped on the surface of the sphere, whether a convex or concave printing error point exists on the surface of the sphere or not is analyzed, pixel point coordinates of a three-dimensional sphere model are analyzed, a pixel point sitting mark is B (x, y and z), coordinate positions of the pixel point B and adjacent pixel points are analyzed, a reasonable range of the distance of the coordinate positions among the pixel points is calculated according to a difference formula: λ=exp (B (x, y, z) -Bt (xt, yt, zt)) 2 Wherein λ is a transition coefficient, exp () is an exponential function, and (B (x, y, z) -Bt (xt, yt, zt)) 2 The coordinate variance of the pixel point B and the adjacent pixel point Bt;
s2: comparing the transition coefficients with coordinate points, determining a region with larger printing error points, selecting a second adjacent pixel point Bt1, wherein the second adjacent pixel point represents a pixel point adjacent to the adjacent pixel point Bt, and simultaneously, the second adjacent pixel point Bt and the pixel point B are on the same line, selecting a third adjacent pixel point Bt2, continuously calculating the transition coefficients, continuously diffusing the position of the pixel point to a region far from the pixel point B along with the increase of iterative calculation times, judging the specific position of the region with the difference, and constructing a loss function to calculate the difference between the pixel point Bt and the pixel point BChanges in the generation calculation process:
wherein σ is a loss function, when the loss function is increased by judging which region the pixel is in through σ, the region has a printing error point, B0 is represented as taking the original pixel, B (x, y, z) is a variable, traversing B0-Btn, btn is the n-1 th adjacent pixel, λ is a variable here, and as the pixel changes,representing gradient operator, judging by sigma, ifThe pixel is not distorted, ifWhen the pixel points are distorted, wherein λmin (B) is the minimum traversed inter-pixel point distance.
Further, after judging that the pixel points on the surface of the sphere are distorted, adjusting the printing pattern according to the distortion degree, and deriving a vector field from a graph in the three-dimensional sphere model, wherein the vector field refers to a set formed by m×n vectors, m×n represents the size of the three-dimensional sphere model, namely the number of pixels in the three-dimensional sphere model, and the vector field is characterized in that all the vectors in the vector field point to a target point, and according to the distortion degree, judging the offset adjustment direction of the inkjet pixel points, and obtaining the direction and offset distance of the vectors by solving the following Euler equation:
and the offset direction and the offset distance of the pixel point mapping of the ink-jet printing image can be determined according to the offset distance and the offset angle, and the mapping of the ink-jet printing image is adjusted.
Further, the plurality of printing heads pair a plurality of colors respectively, RGB values of the images are extracted from the ink-jet printed images, the colors are proportioned in the printing heads to obtain the same color system color distribution, so that the ink-jet pipelining can be realized, the ink-jet printing heads are rotated to jet ink, and the ink is uniformly printed on the surface of the sphere.
Further, as shown in fig. 2, the spherical surface ink jet printing apparatus includes: the visual sensor, the print head, the suction ball rotary support column and the ball running track.
The device has the functions of:
visual sensor: the device is arranged on the printing head and mainly used for acquiring the surface image of the sphere to be printed;
a print head: the printing head stores pigments of various colors, and performs ink-jet printing according to the color of the pigment sprayed by the system control;
suction ball rotating support column: the ball printing device is responsible for sucking a ball to be printed, rotating, and simultaneously acquiring images by matching with a visual sensor and performing ink-jet printing by matching with a printing head;
sphere running rail: the rotary support is mainly used for sucking balls to translate, and the printing head is replaced to jet ink.
Further, a spherical surface inkjet printing system, the system comprising: an image acquisition system, a data processing system, a computer program executable on the data processing system, the data processing system implementing a method of inkjet printing of any of the spherical surfaces of the above methods when the computer program is executed.
The system comprises:
image acquisition system: acquiring images of the surface of the sphere by using an industrial area array camera, and collecting images of each position of the sphere completely according to the rotation of the surface of the sphere;
a data processing system: the method is used for acquiring the sphere surface image and data and processing the sphere surface image and data.
Further, a computer readable storage medium having stored thereon computer instructions which, when executed by a processor, implement a method as claimed in any one of the above methods.
The data processing system is essentially a processor, which may be a central processing unit (Central Processing Unit, CPU), other general purpose processor, digital signal processor (Digital Signal Processor, DSP), application specific integrated circuit (Application Specific Integrated Circuit, ASIC), field programmable gate array (Field-Programmable Gate Array, FPGA) or other programmable logic device, discrete component gate or transistor logic, discrete hardware components, or the like. The general purpose processor may be a microprocessor or the processor may be any conventional processor or the like that is a control center of the spherical surface inkjet printing system, connecting the various sub-areas of the entire spherical surface inkjet printing system using various interfaces and lines.
The storage medium is essentially a memory that can be used to store the computer programs and/or modules, and the processor implements the various functions of the spherical surface inkjet printing system by running or executing the computer programs and/or modules stored in the memory, and invoking data stored in the memory. The memory may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program (such as a sound playing function, an image playing function, etc.) required for at least one function, and the like; the storage data area may store data (such as audio data, phonebook, etc.) created according to the use of the handset, etc. In addition, the memory may include high-speed random access memory, and may also include non-volatile memory, such as a hard disk, memory, plug-in hard disk, smart Media Card (SMC), secure Digital (SD) Card, flash Card (Flash Card), at least one disk storage device, flash memory device, or other volatile solid-state storage device.
Although the present application has been described in considerable detail and with particularity with respect to several described embodiments, it is not intended to be limited to any such detail or embodiment or any particular embodiment so as to effectively cover the intended scope of the application. Furthermore, the foregoing description of the application has been presented in its embodiments contemplated by the inventors for the purpose of providing a useful description, and for the purposes of providing a non-essential modification of the application that may not be presently contemplated, may represent an equivalent modification of the application.
Claims (8)
1. A method of inkjet printing a spherical surface, the method comprising the steps of:
the ball sucking pillar sucks a ball first, moves to the printing position of the first printing head, starts rotating the pillar for a plurality of circles, uniformly sprays ink on the surface of the ball, moves the printing position of the second printing head only, repeats the steps until all printing colors are finished, moves away and releases the ball after starting rotating the pillar for a plurality of circles, and performs ink-jet printing on the next ball.
2. The method for inkjet printing on a spherical surface according to claim 1, wherein the inkjet printing sphere comprises a plurality of printing heads, the printing heads are different in inkjet printing color, a visual sensor is arranged on each printing head, the surface of the sphere is photographed, an image of the surface of the sphere is obtained, the image data of the plurality of surface images of the sphere are integrated, a three-dimensional sphere model is constructed, the shape of the three-dimensional sphere model is analyzed, the printing pattern is mapped into the three-dimensional sphere model, a printing preview image is generated, and the inkjet printing is performed according to the shape of the sphere.
3. The method for inkjet printing on a spherical surface according to claim 2, wherein when the print pattern is mapped on a three-dimensional spherical model, uneven distribution of pixel points occurs, the pixel points are uniformly mapped in the spherical model by adjusting, so that the inkjet printing on the spherical surface of the pixel points does not generate distortion of the print pattern, and the method for adjusting the pixel points to be uniformly mapped in the spherical model comprises the following steps:
s1: after the printing pattern is mapped on the surface of the sphere, whether a convex or concave printing error point exists on the surface of the sphere or not is analyzed, pixel point coordinates of a three-dimensional sphere model are analyzed, a pixel point sitting mark is B (x, y and z), coordinate positions of the pixel point B and adjacent pixel points are analyzed, a reasonable range of the distance of the coordinate positions among the pixel points is calculated according to a difference formula: λ=exp (B (x, y, z) -Bt (xt, yt, zt)) 2 Wherein λ is a transition coefficient, exp () is an exponential function, and (B (x, y, z) -Bt (xt, yt, zt)) 2 The coordinate variance of the pixel point B and the adjacent pixel point Bt;
s2: comparing according to the transition coefficient brought into the coordinate point, determining a region with larger printing error points, selecting a second adjacent pixel point Bt1, wherein the second adjacent pixel point represents a pixel point adjacent to the adjacent pixel point Bt, and meanwhile, the second adjacent pixel point Bt and a pixel point B are on the same line, selecting a third adjacent pixel point Bt2, continuously calculating the transition coefficient, continuously diffusing the position of the pixel point to a region far away from the pixel point B along with the increase of iterative calculation times, judging the specific position of the region with difference, and constructing the change of the loss function calculation in the iterative calculation process:
wherein σ is a loss function, when the loss function is increased by judging which region the pixel is in through σ, the region has a printing error point, B0 is represented as taking the original pixel, B (x, y, z) is a variable, traversing B0-Btn, btn is the n-1 th adjacent pixel, λ is a variable here, and as the pixel changes,representing gradient operator, judging by sigma, ifThe pixel is not distorted, ifWhen the pixel points are distorted, wherein λmin (B) is the minimum traversed inter-pixel point distance.
4. A method of inkjet printing on a spherical surface according to claim 3, wherein after determining that there is distortion in the pixel points on the spherical surface, the printed pattern is adjusted according to the degree of distortion, a vector field is derived from the graph in the three-dimensional sphere model, wherein the vector field is a set of m×n vectors, where m×n represents the size of the three-dimensional sphere model, i.e. the number of pixels in the three-dimensional sphere model, and the vector field is characterized in that all the vectors in the vector field are directed to the target point, and according to the degree of distortion, the offset adjustment direction of the inkjet pixel points is determined, and the direction and offset distance of the vector can be obtained by solving the following euler equation:
and the offset direction and the offset distance of the pixel point mapping of the ink-jet printing image can be determined according to the offset distance and the offset angle, and the mapping of the ink-jet printing image is adjusted.
5. The method for inkjet printing on a spherical surface according to claim 2, wherein the plurality of printing heads pair a plurality of colors respectively, the RGB values of the image are extracted from the inkjet printed image, the colors are allocated in the same color system by matching the colors in the printing heads, so that inkjet pipelining can be realized, and the inkjet printing heads are rotated to inkjet and uniformly print on the surface of the spherical body.
6. A spherical surface ink jet printing device, said device comprising: the visual sensor, the print head, the suction ball rotary support column and the ball running track.
7. A spherical surface inkjet printing system, the system comprising: an image acquisition system, a data processing system, a computer program executable on said data processing system, said data processing system implementing a method of inkjet printing a spherical surface according to any one of claims 1 to 5 when said computer program is executed.
8. A computer readable storage medium, wherein the computer readable storage medium stores computer instructions which, when executed by a processor, implement the method of any one of claims 1-5.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311254641.5A CN117162666A (en) | 2023-09-27 | 2023-09-27 | Method, device, system and storage medium for spherical surface ink-jet printing |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311254641.5A CN117162666A (en) | 2023-09-27 | 2023-09-27 | Method, device, system and storage medium for spherical surface ink-jet printing |
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| CN202311254641.5A Pending CN117162666A (en) | 2023-09-27 | 2023-09-27 | Method, device, system and storage medium for spherical surface ink-jet printing |
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