CN114119632A - Rotary type slice segmentation method, system, controller and printer - Google Patents

Rotary type slice segmentation method, system, controller and printer Download PDF

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CN114119632A
CN114119632A CN202111339929.3A CN202111339929A CN114119632A CN 114119632 A CN114119632 A CN 114119632A CN 202111339929 A CN202111339929 A CN 202111339929A CN 114119632 A CN114119632 A CN 114119632A
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coordinate system
printing
optical machine
segmented
annular region
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CN114119632B (en
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杨依哲
刘兵山
刘晓东
李鑫
王功
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Technology and Engineering Center for Space Utilization of CAS
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T7/00—Image analysis
    • G06T7/10—Segmentation; Edge detection
    • G06T7/11—Region-based segmentation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
    • B29C64/30—Auxiliary operations or equipment
    • B29C64/386—Data acquisition or data processing for additive manufacturing
    • B29C64/393—Data acquisition or data processing for additive manufacturing for controlling or regulating additive manufacturing processes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y50/00—Data acquisition or data processing for additive manufacturing
    • B33Y50/02—Data acquisition or data processing for additive manufacturing for controlling or regulating additive manufacturing processes
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T2207/00—Indexing scheme for image analysis or image enhancement
    • G06T2207/10—Image acquisition modality
    • G06T2207/10004—Still image; Photographic image
    • G06T2207/10012—Stereo images
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/25—Process efficiency

Abstract

The invention relates to the field of 3D printing, in particular to a rotary type slice segmentation method, a rotary type slice segmentation system, a rotary type slice segmentation controller and a printer. The method comprises the following steps: step 1, establishing an equipment coordinate system by taking a gravity center point of an effective projection rectangle of an optical machine as a first origin, and establishing a global coordinate system by taking the gravity center point of an input image as a second origin; step 2, calculating and adjusting the single rotation amount of the effective projection rectangle of the optical machine; step 3, converting a coordinate system of the annular region to be segmented under the global coordinate system according to the equipment coordinate system; and 4, segmenting the region to be segmented converted based on the coordinate system based on the single rotation amount. The invention can reduce the loss of printing precision caused by division, and adjust the whole printing pattern according to the projection shape of the optical machine every time by adopting a division type printing mode, thereby further meeting different printing tasks and completing the effect of large-scale printing.

Description

Rotary type slice segmentation method, system, controller and printer
Technical Field
The invention relates to the field of 3D printing, in particular to a rotary type slice segmentation method, a rotary type slice segmentation system, a rotary type slice segmentation controller and a printer.
Background
With the development of related fields such as machinery, materials, computers and the like, the 3D printing technology (also called additive manufacturing technology) is gradually becoming a new type of force in the manufacturing industry, and in recent years, the 3D printing technology has become a thermoelectric research in the manufacturing industry by virtue of its high material utilization rate, convenience in use and high adaptability to complex models. The 3D printing technology can be divided into, according to the material used and the printing method used, the following: fused Deposition Modeling (FDM), Stereolithography (SLA), three-dimensional powder bonding (3DP), Selective Laser Sintering (SLS), low-order build (LOM), Digital Light Processing (DLP), fuse fabrication (FFF), electron beam melting modeling (EMB), and the like; the difference in projection effect is classified into line exposure (scanning) and surface exposure (scanning), and since a cut piece is projected simultaneously when the same layer is printed by the surface exposure method, the in-plane accuracy of the molded article is higher than that of linear exposure (scanning), and thus the method has attracted much attention of researchers.
However, surface exposure also has some disadvantages, and surface exposure uses optical projection, and the size of the optical projection limits the overall size of the print. The prior methods for solving the problem of large-scale surface exposure printing comprise the following steps: increasing the size or number of machines: the disadvantage of this method is that the size of the print is still dependent on the optical machine itself, and it is impossible to extend the size or increase the number of optical machines infinitely, under the limits of the practical budget and the development of the hardware itself; exposure with movement of the light machine(s): during printing, the optical machine can move along one or more directions, and surface exposure is carried out in a constant-speed push-scan exposure mode (the whole printing plane is divided into rectangular strips with a certain specification (projection size) along the direction of a coordinate system, the position of the optical machine is continuously moved at a constant speed according to a Z-shape from an initial position 4, scanning and projection are carried out simultaneously until a whole working area is traversed) or a point-to-point stop exposure mode (the whole printing plane is divided into squares with a certain specification (projection size) along the direction of the coordinate system, the position of the optical machine is continuously moved according to the Z-shape from the initial position 4, the optical machine is moved to the center of each square and the stop exposure is carried out). The prior art does not solve the problem of printing large-scale exposure surfaces with respect to the splitting scheme.
Disclosure of Invention
The invention aims to provide a rotary type slice segmentation method, a rotary type slice segmentation system, a rotary type slice segmentation controller and a rotary type slice segmentation printer.
The technical scheme for solving the technical problems is as follows: a rotary type slice segmentation method based on a single optical machine comprises the following steps:
step 1, establishing an equipment coordinate system by taking a gravity center point of an effective projection rectangle of an optical machine as a first origin, and establishing a global coordinate system by taking the gravity center point of an input image as a second origin;
step 2, calculating and adjusting the single rotation amount of the effective projection rectangle of the optical machine;
step 3, converting a coordinate system of the annular region to be segmented under the global coordinate system according to the equipment coordinate system, wherein the annular region to be segmented is obtained according to an input image;
and 4, segmenting the region to be segmented converted based on the coordinate system based on the single rotation amount.
The invention has the beneficial effects that: rotary motion printing can be compatible to some extent with the requirements of single axis precision and two dimensional printing range. The invention reduces the loss of printing precision caused by division by a rotary cutting printing mode, and adjusts the whole printing pattern according to the projection shape of the optical machine and the like each time by adopting a division printing mode, thereby further meeting different printing tasks and meeting the requirement of large-scale printing.
On the basis of the technical scheme, the invention can be further improved as follows.
Further, obtaining the annular region to be segmented according to the input image includes:
and dividing the input image in an effective circular ring mode, and determining the image belonging to the inner part of the circular ring as the annular region to be segmented.
The further scheme has the beneficial effect that the printing area of the optical machine can be effectively distinguished through processing the input image.
Further, the step 2 specifically includes:
calculating the single rotation amount θ by a first formula:
Figure BDA0003351470050000031
wherein, a is the length dimension of the effective projection of the optical machine, b is the width dimension of the effective projection of the optical machine, and r is the radius of the circle which can not be projected inside and is influenced by the rotary printing;
when the single rotation theta is not an integer factor of 360,
replacing the a value corresponding to the first integer factor closest to the single rotation amount theta in all the integer factors of 360 with the a value corresponding to the current single rotation amount theta;
or, taking the input image as the annular region to be segmented, calculating a first single rotation amount through the first formula, and taking the first single rotation amount as the single rotation amount theta.
Further, the coordinate system conversion specifically includes:
converting the annular region to be segmented under the global coordinate system into the projection coordinates of the annular region to be segmented under the equipment coordinate system by a second formula, wherein the second formula is as follows:
Figure BDA0003351470050000032
wherein N is the number of rotations, xc,ycThe relation between the round points of the equipment coordinate system and the rotation times is as follows:
Figure BDA0003351470050000033
further, step 4 is followed by:
step 5, after a circle of division, offsetting the preset value along the current rotation directionAngle of rotation
Figure BDA0003351470050000034
And (4) repeating the step (4) until the printing is finished.
The beneficial effect of adopting above-mentioned further scheme is that, avoid when actually printing because error such as scraper, rotation angle can have certain space or seam, form the abnormal state of printing. The method of offsetting the preset angle ensures that the seams of each layer are not at the same angle and have uniform errors.
Another technical solution of the present invention for solving the above technical problems is as follows: a rotary type slicing and dividing method based on multiple optical machines comprises the steps that each first optical machine is divided by the rotary type slicing and dividing method based on the single optical machine, wherein the multiple first optical machines are arranged along the tangential direction of an annular region to be divided, and the number of the first optical machines is determined according to the distance angle of the first optical machines;
each second optical machine is divided by adopting the single optical machine-based rotary slice dividing method, wherein the plurality of second optical machines are arranged along the radial direction of the annular region to be divided, and the number of the second optical machines is calculated according to the annular region to be divided and the projection area of the optical machines.
The invention has the beneficial effects that: rotary motion printing can be compatible to some extent with the requirements of single axis precision and two dimensional printing range. The invention reduces the loss of printing precision caused by division by a rotary cutting printing mode, and adjusts the whole printing pattern according to the projection shape of the optical machine and the like each time by adopting a division printing mode, thereby further meeting different printing tasks and meeting the requirement of large-scale printing.
Another technical solution of the present invention for solving the above technical problems is as follows: the utility model provides a rotation type section segmentation system based on single ray apparatus which characterized in that includes:
the establishing module is used for establishing an equipment coordinate system by taking the gravity center point of the optical machine effective projection rectangle as a first origin, and establishing a global coordinate system by taking the gravity center point of the input image as a second origin;
the calculation module is used for calculating and adjusting the single rotation amount of the effective projection rectangle of the optical machine;
the conversion module is used for carrying out coordinate system conversion on the annular region to be segmented under the global coordinate system according to the equipment coordinate system, wherein the annular region to be segmented is obtained according to an input image;
and the segmentation module is used for segmenting the region to be segmented converted based on the coordinate system based on the single rotation amount.
The invention has the beneficial effects that: rotary motion printing can be compatible to some extent with the requirements of single axis precision and two dimensional printing range. The invention reduces the loss of printing precision caused by division by a rotary cutting printing mode, and adjusts the whole printing pattern according to the projection shape of the optical machine and the like each time by adopting a division printing mode, thereby further meeting different printing tasks and meeting the requirement of large-scale printing.
Further, obtaining the annular region to be segmented according to the input image includes:
and dividing the input image in an effective circular ring mode, and determining the image belonging to the inner part of the circular ring as the annular region to be segmented.
The method has the advantages that the printing area of the optical machine can be effectively distinguished through preprocessing the input image, and the gray value of the invalid image is set to be 0 so as to facilitate the identification of the area to be processed.
Further, the calculation module is specifically configured to:
calculating the single rotation amount θ by a first formula:
Figure BDA0003351470050000051
wherein, a is the length dimension of the effective projection of the optical machine, b is the width dimension of the effective projection of the optical machine, and r is the radius of the circle which can not be projected inside and is influenced by the rotary printing;
when the single rotation theta is not an integer factor of 360,
replacing the a value corresponding to the first integer factor closest to the single rotation amount theta in all the integer factors of 360 with the a value corresponding to the current single rotation amount theta;
or, taking the input image as the annular region to be segmented, calculating a first single rotation amount through the first formula, and taking the first single rotation amount as the single rotation amount theta.
Further, the coordinate system conversion specifically includes:
converting the annular region to be segmented under the global coordinate system into projection coordinates (x, y) of the annular region to be segmented under the equipment coordinate system through a second formula, wherein the second formula is as follows:
Figure BDA0003351470050000052
wherein N is the number of rotations, xc,ycThe relation between the round points of the equipment coordinate system and the rotation times is as follows:
Figure BDA0003351470050000061
further, still include: a repeating module for deviating a preset angle along the current rotation direction after cutting one circle
Figure BDA0003351470050000062
The division module is repeatedly executed until printing is completed.
The beneficial effect of adopting above-mentioned further scheme is that, avoid when actually printing because error such as scraper, rotation angle can have certain space or seam, form the abnormal state of printing. The method of offsetting the preset angle ensures that the seams of each layer are not at the same angle and have uniform errors.
Another technical solution of the present invention for solving the above technical problems is as follows: a controller comprises a control chip, wherein the control chip is used for executing any one of the rotary slicing and cutting method based on the single optical machine.
The invention has the beneficial effects that: rotary motion printing can be compatible to some extent with the requirements of single axis precision and two dimensional printing range. The invention reduces the loss of printing precision caused by division by a rotary cutting printing mode, and adjusts the whole printing pattern according to the projection shape of the optical machine and the like each time by adopting a division printing mode, thereby further meeting different printing tasks and meeting the requirement of large-scale printing.
Another technical solution of the present invention for solving the above technical problems is as follows: a printer includes any one of the controllers.
The invention has the beneficial effects that: rotary motion printing can be compatible to some extent with the requirements of single axis precision and two dimensional printing range. The invention reduces the loss of printing precision caused by division by a rotary cutting printing mode, and adjusts the whole printing pattern according to the projection shape of the optical machine and the like each time by adopting a division printing mode, thereby further meeting different printing tasks and meeting the requirement of large-scale printing.
Drawings
FIG. 1 is a schematic flow chart of a method for slicing a rotary slice according to an embodiment of the present invention;
FIG. 2 is a block diagram of a rotary slicing and separating system according to an embodiment of the present invention;
FIG. 3 is a schematic view of a rotary slicing method according to an embodiment of the present invention;
fig. 4(a) is a schematic view of an effective printing range at the center of a circle provided by an embodiment of a method for dividing a rotary slice based on a single optical machine according to the present invention;
FIG. 4(b) is a schematic diagram of an effective printing range provided by an embodiment of a method for dividing a rotary cut-sheet based on a single optical machine according to the present invention;
FIG. 5 is a schematic diagram of image secondary processing provided by an embodiment of a method for rotary slice segmentation based on a single optical machine according to the present invention;
FIG. 6 is a schematic diagram of a dual coordinate system provided by an embodiment of a method for dividing a rotary slice based on a single optical machine according to the present invention;
FIG. 7 is a schematic diagram of a rotational coordinate transformation provided by an embodiment of a method for slicing by rotation based on a single optical machine according to the present invention;
FIG. 8 is a schematic diagram illustrating rotation of a non-integer angle factor according to an embodiment of a method for slicing by rotation based on a single light machine according to the present invention;
FIG. 9 is a schematic diagram of a single-rotation division area according to an embodiment of the method for dividing a rotary slice based on a single optical machine according to the present invention;
FIG. 10 is a schematic view of a coordinate of a segmentation area provided in an embodiment of a method for segmenting a rotary slice based on a single optical machine according to the present invention;
fig. 11(a) is a schematic diagram of an irregular polygon segmentation provided in an embodiment of a method for segmenting a rotary slice based on a single optical machine according to the present invention;
FIG. 11(b) is a schematic diagram of curve segmentation provided by an embodiment of a method for rotary slicing segmentation based on a single optical machine according to the present invention;
FIG. 12 is a schematic view of a tangential add optical machine according to an embodiment of the present invention;
FIG. 13 is a schematic view of printing a large-scale circular object according to an embodiment of the method for dividing a rotary slice based on a single optical machine of the present invention;
FIG. 14 is a schematic view of a radial add optical machine according to an embodiment of the present invention;
fig. 15 is a schematic view of a dual-optical-machine nested printing cylinder according to an embodiment of the method for dividing a rotary slice based on a single optical machine.
In the drawings, the components represented by the respective reference numerals are listed below:
1. the image processing device comprises an image effective area, an area outside a circular ring, a circular ring area, a starting position, a first optical machine, a second optical machine and a repeated projection area, wherein the image effective area is 2, the area outside the circular ring is 3, the circular ring area is 4, the starting position is 5, the first optical machine is 6, the second optical machine is 7, and the repeated projection area is 7.
Detailed Description
The principles and features of this invention are described below in conjunction with examples which are set forth to illustrate, but are not to be construed to limit the scope of the invention.
As shown in fig. 1, a rotary slicing and dividing method based on a single optical machine includes:
step 1, establishing an equipment coordinate system by taking a gravity center point of an effective projection rectangle of an optical machine as a first origin, and establishing a global coordinate system by taking the gravity center point of an input image as a second origin;
step 2, calculating and adjusting the single rotation amount of the effective projection rectangle of the optical machine;
step 3, converting a coordinate system of the annular region to be segmented under the global coordinate system according to the equipment coordinate system, wherein the annular region to be segmented is obtained according to an input image;
and 4, segmenting the region to be segmented converted based on the coordinate system based on the single rotation amount.
In some possible embodiments, rotary motion printing may be somewhat compatible with the requirements of single axis precision and two dimensional printing range. The invention reduces the loss of printing precision caused by division by a rotary cutting printing mode, and adjusts the whole printing pattern according to the projection shape of the optical machine and the like each time by adopting a division printing mode, thereby further meeting different printing tasks and meeting the requirement of large-scale printing.
Example 1, as shown in fig. 3 and 4, the effective projected rectangular area of a given optical engine is a × b. A grey circular area (affected by practical factors) not projected in the center of the tray, with radius r 1. The effective printing area (measure with the circle) of current ray apparatus is for using R2 to circle radius, use R1 to be circle radius's ring region, the effective pixel of printing the image need be in R2 for circle radius and the scope of this ring of using R1 to circle radius, can accomplish the printing target, R2 is the circular radius that effective projection rectangle formed, when selecting the printing piece, some foraminiferous of many choices, the circular-like printing piece, through setting up the foraminiferous part of printing piece in central grey region, print ring class sample etc. and avoid the influence. At the intercepting stage of the effective area, the algorithm comprises four boundaries which can be used as intercepting elements, namely an inner polygon, an outer polygon and an inner circle, the range of a circular ring is smaller than that of the area between the polygons, but the selected image cannot be accurately limited by taking the polygons as intercepting measurement modes, so that a circular ring intercepting method is adopted. For the input image (within the valid range), in BMP format, rectangular. Given a width W (pixels), a height H (pixels), the resolution is m × n (measured in number of pixels). The annular region 3 is cut using the above-mentioned effective annular ring, the annular effective region 1 is an effective pixel portion, a square image (secondary processed image) with 2 × R1 as a side length is stored, and the gray level of the portion of the annular outer region 2 is set to 0, as shown in fig. 5.
The rotational slicing algorithm requires two coordinate systems to be done together. A global coordinate system (x, y) with the center of the disk as the origin (also the center of the image), the global coordinate system also being used as the coordinate system of the original image and the secondary processed image; the other is the coordinate system (x, y) of the device in the center of the effective projection rectangle of the optical machine, which is the coordinate system used by the optical machine, and the range of the coordinate system is (xwL, xwR, ywB, ywT). When the image is divided, a part needing to be projected is divided by using the global coordinate system of the image, the gray value of a corresponding pixel is set, and when the optical machine projects the part, the global coordinate is required to be converted into the device coordinate for projection.
According to the coordinate system transformation principle, the relationship between the global system coordinate (x, y) and the corresponding device coordinate (x, y) is as follows:
Figure BDA0003351470050000101
where N represents the number of rotations, and the initial position 4 is a position where the image coordinate system and the global coordinate system are in alignment (the number of rotations is 0); theta is the single rotation; (x)c,yc) Is the center of the projection area (origin of the device coordinate system) and has a relationship with the number of rotations
Figure BDA0003351470050000102
In order to ensure the completeness of the polygon, the upper left corner of the projection rectangle projected by the optical machine after the disk rotates at least coincides with the upper right corner of the rectangle before the disk rotates, namely, the maximum angle theta of single rotation ensures that the whole polygon area can be covered in successive rotation.
The coordinate system in fig. 6 is a global coordinate system, according to the rotation transformation in the two-dimensional affine transformation (the disk rotates counterclockwise, and the projection area rotates clockwise accordingly). The rotation transformation process is shown in fig. 8, and the relationship between the single rotation amount θ and the device parameter is:
Figure BDA0003351470050000103
where a is the long dimension of the optical engine effective projection, b is the wide dimension of the optical engine effective projection, r is the radius of the inner non-projectable circle affected by the rotation printing, and when the rotation angle θ is not a factor of 360 °, it cannot form a complete regular polygon, and its printing effective area is between a factor smaller than it and a factor larger than it (in case of a certain value of b). (e.g., an effective print area of 13 ° is larger than 12 ° and smaller than 15 °). In this case, there are two kinds of operations available as a solution:
and directly reducing the current a to a value a corresponding to the degree of the maximum 360-degree integer factor smaller than the current theta, and converting the value a into a symmetrical integer rotation mode.
As shown in fig. 7, the irregular area actually covered is calculated to be the maximum effective area, and the rotation is still performed according to the angle θ obtained by the calculation. However, this method results in different rotation positions for each layer, each layer needs to be recalculated, and the image of the last rotation position of each layer is different from the selection of other effective pixel positions, which may cause a large amount of calculation.
R < a < b in the normal case, then
Figure BDA0003351470050000111
Then theta e (0,53 deg.), where 360 is 2 deg., 4 deg., 6 deg., 8 deg., 10 deg., 12 deg., 18 deg., 20 deg., 24 deg., 30 deg., 36 deg., 40 deg., 45 deg.. It can be seen that the difference between adjacent factors is at most 6 °, and therefore, for the case where θ is a factor other than 360 °, the rounding method (the first method) does not cause a large error, and the calculation amount can be reduced.
The area of the graph in which the single rotation slice area (for the secondary processing image) has been processed into a circular area is shown in fig. 9 and 10, the corresponding effective pixels of the secondary processing image are projected according to the coordinate transformation in the portion inside the area, the gray value outside the area is set to 0, and in addition, in fig. 10, the coordinates of four points are respectively:
[-0.5acosNθ+(b+r)sinNθ,0.5asinNθ+(b+r)cosNθ]，
[0.5acosNθ+(b+r)sinNθ,-0.5asinNθ+(b+r)cosNθ]，
Figure BDA0003351470050000112
Figure BDA0003351470050000113
theoretically, the splicing of the two-time curing surface is complete during exposure, but a certain gap or seam exists due to errors such as a scraper and a rotating angle during actual printing, so that an abnormal state of a printed piece is formed. In order to ensure that the seams of each layer are not at the same angle and have uniform errors, the seams need to be continuously shifted to the current direction by an angle after exposure for one circle
Figure BDA0003351470050000114
From this position the printing of the next layer is started. In addition, in the case of integer factor rotation other than 360 °, if it is changed to an integer number of rotations according to the first solution described above, the processing method is the same as just before, and if the second method is adopted, since the rotation position of each layer is different, the processing method is the sameThe seam position is not at an angle, and subsequent treatment is not needed.
The shape of the rotary segmentation pattern can adopt any other segmentation shape which can complete 360-degree splicing. In addition to the isosceles trapezoid division, irregular polygons and curved shapes as exemplified in fig. 11 may be used. The shape of the division can be determined according to the actual printed object, for example, for a printed matter such as a turbine blade, because the shape is divided into sectors around the center, the curve division adapted to the shape can improve the precision of the printed matter, and the printed matter is attached to a printing area, so that the printed matter has a better printing effect.
Preferably, in any of the above embodiments, step 1 further comprises:
reading image data in a preset mode, obtaining an input image, and preprocessing the input image to obtain a preprocessing result, wherein the preprocessing result comprises: the image belonging to the inner part of the circular ring is the annular region to be segmented and is stored in a fixed size, the image not belonging to the inner part of the circular ring is an invalid image, the gray value of the invalid image is set to be 0, and the preprocessing comprises the following steps: the input image is divided in an effective circular ring manner.
In some possible embodiments, the printing area of the optical machine can be effectively distinguished through preprocessing of the input image, and the gray value of the invalid image is set to 0 so as to facilitate the identification of the area to be processed.
It should be noted that, the image data in the preset mode is: BMP format, rectangular. Given a width W (pixels), a height H (pixels), the resolution is m × n (measured in number of pixels). The fixed size is stored as: square images with 2 × R1 as the side length were stored, and the effective circle was the circle region with R2 as the inner circle radius and R1 as the outer circle radius in example 1.
Preferably, in any of the above embodiments, the step 2 specifically includes:
calculating the single rotation amount θ by a first formula:
Figure BDA0003351470050000121
wherein, a is the length dimension of the effective projection of the optical machine, b is the width dimension of the effective projection of the optical machine, and r is the radius of the circle which can not be projected inside and is influenced by the rotary printing;
when the single rotation theta is not an integer factor of 360,
replacing the a value corresponding to the first integer factor closest to the single rotation amount theta in all the integer factors of 360 with the a value corresponding to the current single rotation amount theta;
or, taking the input image as the annular region to be segmented, calculating a first single rotation amount through the first formula, and taking the first single rotation amount as the single rotation amount theta.
It should be noted that, in the closest sense, this is understood to be a first integer factor smaller than the current single rotation amount θ.
Preferably, in any of the above embodiments, the coordinate system conversion specifically includes:
converting the annular region to be segmented under the global coordinate system into the projection coordinates of the annular region to be segmented under the equipment coordinate system by a second formula, wherein the second formula is as follows:
Figure BDA0003351470050000131
wherein N is the number of rotations, xc,ycThe relation between the round points of the equipment coordinate system and the rotation times is as follows:
Figure BDA0003351470050000132
preferably, in any of the above embodiments, the step 4 is further followed by:
step 5, after a circle of division, deviating a preset angle along the current rotation direction
Figure BDA0003351470050000133
And (4) repeating the step (4) until the printing is finished.
In some possible embodiments, in order to avoid that a certain gap or seam exists due to errors of a scraper, a rotation angle and the like when actually printing, an abnormal state of the printed matter is formed. The method of offsetting the preset angle ensures that the seams of each layer are not at the same angle and have uniform errors.
Another technical solution of the present invention for solving the above technical problems is as follows: a rotary type slicing and cutting method based on multiple optical machines enables each first optical machine to be cut by adopting the rotary type slicing and cutting method based on a single optical machine, wherein the multiple first optical machines are arranged along the tangential direction of an annular region to be cut, and the number of the first optical machines is determined according to the distance angle of the first optical machines;
each second optical machine is divided by adopting the single optical machine-based rotary slice dividing method, wherein the plurality of second optical machines are arranged along the radial direction of the annular region to be divided, and the number of the second optical machines is calculated according to the annular region to be divided and the projection area of the optical machines.
In some possible embodiments, rotary motion printing may be somewhat compatible with the requirements of single axis precision and two dimensional printing range. The invention reduces the loss of printing precision caused by division by a rotary cutting printing mode, and adjusts the whole printing pattern according to the projection shape of the optical machine and the like each time by adopting a division printing mode, thereby further meeting different printing tasks and meeting the requirement of large-scale printing.
Embodiment 2, in order to promote printing efficiency, increase the printing area and obtain different printing effects, can adopt a plurality of ray apparatus to carry out radial and tangential combination projection's mode and print.
(1) In the tangential direction
In the tangential direction, two or more photomasks at certain angles on the circumference are used for rotary printing, such as the two photomasks shown in fig. 12.
Action 1: time is saved, for example, printing can be completed by each half-cycle of rotation of two symmetrical light machines, the smaller the distance angle between the light machines is, the more light machines are used, and the more time is saved in printing; however, it should be considered that when the optical engine is too dense, the same position of the picture may be exposed repeatedly, and corresponding picture transformation is required according to the situation.
Action 2: different light machines can adopt different wavelengths or illumination time to finish different curing properties at different positions, and the printing precision and efficiency are improved.
When the number of the optical machines is increased along the tangential direction, attention is paid to the overlapping problem between the optical machines, taking fig. 12 as an example, if the optical machines rotate counterclockwise at the right upper position, the first four rotations overlap with the first position, and the fifth position is separated from the first position. If a further optical machine needs to be added, the optical machine needs to be placed at a fifth or later rotation position, and the placed position cannot be overlapped with the initial position 4, in this case, the cutting algorithm cannot be changed and is the same as that of the single optical machine. Different or the same cutting pictures can be transmitted to different photomasks according to requirements (the printing speed is increased or secondary exposure is carried out), and the photomasks can also adopt different wavelengths for projection, so that different curing effects of materials are achieved.
For printing a large ring-shaped object exceeding the size of the optical machine, a plurality of optical machines can be placed on a circle with a larger radius to perform tangential rotation, for example, in fig. 13, the distance of changing the radius is increased in the radial direction by the coordinate of the cut picture, and only r in the above disclosure needs to be adjusted, and the rest is the same as the case of a single optical machine.
(2) In the radial direction
The number of the radial ray machines is increased along the radial direction, and the projection area can be enlarged to solve the problem that the area of the ray machines is not enough to cover the printing projection area, which is similar to the principle of increasing the number of the ray machines tangentially; or as shown in fig. 14, in which there is a repeated projection area 7, the same pattern is projected on the same area by using a plurality of light machines, so that the projection time can be reduced under the condition that the material solidification degree is the same. The two principles are different, the former is to increase the exposure area, and the latter is to increase the exposure time.
Furthermore, by using the radial movement and rotational nature of rotary printing, it is possible to print articles beyond the size of the optical machine and nest annular or similar patterns.
The slice is not necessarily covered from the center in the optical machine projection, as shown in fig. 15, the large cylindrical ring of the outer ring is printed by the first optical machine 5, according to the design of the original single optical machine, the large cylindrical ring cannot be contained, the optical machine with a larger size needs to be used or pushed and swept, but the inside of the cylindrical ring is a hole, the printing is not needed actually, the size of the circular ring is seen independently, the optical machine can move a certain distance in the radial direction, the slice is rotated and divided for printing, and the consumption of the large optical machine is saved. The position and parameter design is the same as the arrangement of a larger printing circle radius arranged in the tangential direction.
Simultaneously, for make full use of print platform, other printed object can be placed to middle hole, for example the centre of a circle position is the same, and the cylinder ring that the radius is less uses second ray apparatus 6 to print, and second ray apparatus 6 all rotates around the same shafting with first ray apparatus 5, but the circumference radius size of locating is different, sets up the effect that two nested prints simultaneously of object of big or small difference can be realized for two ray apparatuses, has improved the efficiency of once printing.
3. The optical machine can move along radial direction and tangential direction
(3) Radial movement function
The optical machine can also be added with a function of moving along the radial direction, the problem of printing a gray area in the middle of the optical machine can be solved, and the optical machine is moved to the center (0,0) to perform one-time projection after one-circle rotation is finished (the gray area in the center is generally far smaller than the projection area of the optical machine under the condition of a single optical machine, and one-time projection can be covered).
Meanwhile, the projection area can be enlarged to solve the problem that the optical machine area is not enough to cover the printing projection area. The radial movement can be realized by stopping projection by using projection points one by one, and also can be realized by adopting a push-broom projection mode, namely, the projection image is changed in real time, and the optical machine moves at a uniform speed along the radial direction or the tangential direction to complete printing. Compared with horizontal/vertical push-broom printing, the method has better effect on printing of curve outlines.
As shown in fig. 2, a rotary slicing and dividing system based on a single optical machine includes:
the establishing module 100 is used for establishing an equipment coordinate system by taking the gravity center point of the optical machine effective projection rectangle as a first origin, and establishing a global coordinate system by taking the gravity center point of the input image as a second origin;
a calculation module 200 for calculating a single rotation amount for adjusting the effective projection rectangle of the optical machine;
the conversion module 300 is configured to perform coordinate system conversion on the annular region to be segmented in the global coordinate system according to the device coordinate system, where the annular region to be segmented is obtained according to an input image;
and a segmentation module 400, configured to segment the region to be segmented after the coordinate system transformation based on the single rotation amount.
In some possible embodiments, rotary motion printing may be somewhat compatible with the requirements of single axis precision and two dimensional printing range. The invention reduces the loss of printing precision caused by division by a rotary cutting printing mode, and adjusts the whole printing pattern according to the projection shape of the optical machine and the like each time by adopting a division printing mode, thereby further meeting different printing tasks and meeting the requirement of large-scale printing.
Preferably, in any of the above embodiments, further comprising: the preprocessing module is used for reading image data in a preset mode, obtaining an input image, preprocessing the input image, and obtaining a preprocessing result, wherein the preprocessing result comprises: the image belonging to the inner part of the circular ring is the annular region to be segmented and is stored in a fixed size, the image not belonging to the inner part of the circular ring is an invalid image, the gray value of the invalid image is set to be 0, and the preprocessing comprises the following steps: the input image is divided in an effective circular ring manner.
In some possible embodiments, the printing area of the optical machine can be effectively distinguished through preprocessing of the input image, and the gray value of the invalid image is set to 0 so as to facilitate the identification of the area to be processed.
Preferably, in any of the above embodiments, the computing module 200 is specifically configured to:
calculating the single rotation amount θ by a first formula:
Figure BDA0003351470050000171
wherein, a is the length dimension of the effective projection of the optical machine, b is the width dimension of the effective projection of the optical machine, and r is the radius of the circle which can not be projected inside and is influenced by the rotary printing;
when the single rotation theta is not an integer factor of 360,
replacing the a value corresponding to the first integer factor closest to the single rotation amount theta in all the integer factors of 360 with the a value corresponding to the current single rotation amount theta;
or, taking the input image as the annular region to be segmented, calculating a first single rotation amount through the first formula, and taking the first single rotation amount as the single rotation amount theta.
Preferably, in any of the above embodiments, the coordinate system conversion specifically includes:
converting the annular region to be segmented under the global coordinate system into projection coordinates (x, y) of the annular region to be segmented under the equipment coordinate system through a second formula, wherein the second formula is as follows:
Figure BDA0003351470050000172
wherein N is the number of rotations, xc,ycThe relation between the round points of the equipment coordinate system and the rotation times is as follows:
Figure BDA0003351470050000173
preferably, in any of the above embodiments, further comprising: a repeating module for deviating a preset angle along the current rotation direction after cutting one circle
Figure BDA0003351470050000174
The division module 400 is repeatedly executed until printing is completed.
In some possible embodiments, in order to avoid that a certain gap or seam exists due to errors of a scraper, a rotation angle and the like when actually printing, an abnormal state of the printed matter is formed. The method of offsetting the preset angle ensures that the seams of each layer are not at the same angle and have uniform errors.
Another technical solution of the present invention for solving the above technical problems is as follows: a controller comprises a control chip, wherein the control chip is used for executing any one of the rotary slicing and cutting method based on the single optical machine.
In some possible embodiments, rotary motion printing may be somewhat compatible with the requirements of single axis precision and two dimensional printing range. The invention reduces the loss of printing precision caused by division by a rotary cutting printing mode, and adjusts the whole printing pattern according to the projection shape of the optical machine and the like each time by adopting a division printing mode, thereby further meeting different printing tasks and meeting the requirement of large-scale printing.
Another technical solution of the present invention for solving the above technical problems is as follows: a printer includes any one of the controllers.
In some possible embodiments, rotary motion printing may be somewhat compatible with the requirements of single axis precision and two dimensional printing range. The invention reduces the loss of printing precision caused by division by a rotary cutting printing mode, and adjusts the whole printing pattern according to the projection shape of the optical machine and the like each time by adopting a division printing mode, thereby further meeting different printing tasks and meeting the requirement of large-scale printing.
The reader should understand that in the description of this specification, reference to the description of the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described method embodiments are merely illustrative, and for example, the division of steps into only one logical functional division may be implemented in practice in another way, for example, multiple steps may be combined or integrated into another step, or some features may be omitted, or not implemented.
The above method, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention essentially or partially contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-only memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
While the invention has been described with reference to specific embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (10)

1. A rotary type slice segmentation method based on a single optical machine is characterized by comprising the following steps:
step 1, establishing an equipment coordinate system by taking a gravity center point of an effective projection rectangle of an optical machine as a first origin, and establishing a global coordinate system by taking the gravity center point of an input image as a second origin;
step 2, calculating and adjusting the single rotation amount of the effective projection rectangle of the optical machine;
step 3, converting a coordinate system of the annular region to be segmented under the global coordinate system according to the equipment coordinate system, wherein the annular region to be segmented is obtained according to an input image;
and 4, segmenting the region to be segmented converted based on the coordinate system based on the single rotation amount.
2. The method according to claim 1, wherein the obtaining the annular region to be segmented according to the input image comprises:
and dividing the input image in an effective circular ring mode, and determining the image belonging to the inner part of the circular ring as the annular region to be segmented.
3. The rotary slicing and dividing method based on the single optical machine as claimed in claim 2, wherein the step 2 specifically comprises:
calculating the single rotation amount θ by a first formula:
Figure FDA0003351470040000011
wherein, a is the length dimension of the effective projection of the optical machine, b is the width dimension of the effective projection of the optical machine, and r is the radius of the circle which can not be projected inside and is influenced by the rotary printing;
when the single rotation theta is not an integer factor of 360,
replacing the a value corresponding to the first integer factor closest to the single rotation amount theta in all the integer factors of 360 with the a value corresponding to the current single rotation amount theta;
or, taking the input image as the annular region to be segmented, calculating a first single rotation amount through the first formula, and taking the first single rotation amount as the single rotation amount theta.
4. The method of claim 3, wherein the coordinate system transformation specifically comprises:
converting the annular region to be segmented under the global coordinate system into projection coordinates (x, y) of the annular region to be segmented under the equipment coordinate system through a second formula, wherein the second formula is as follows:
Figure FDA0003351470040000021
wherein N is the number of rotations, xc,ycThe relation between the round points of the equipment coordinate system and the rotation times is as follows:
Figure FDA0003351470040000022
5. the method according to claim 1, further comprising the following step after step 4:
step 5, after a circle of division, deviating a preset angle along the current rotation direction
Figure FDA0003351470040000023
And (4) repeating the step (4) until the printing is finished.
6. A rotary type slice segmentation method based on a multi-optical machine is characterized by comprising the following steps:
enabling each first optical machine to be divided by adopting a single optical machine-based rotary slicing and dividing method according to any one of claims 1-5, wherein a plurality of first optical machines are arranged along the tangential direction of an annular region to be divided, and the number of the first optical machines is determined according to the first optical machine spacing angle;
the single-light-machine-based rotary slicing method for dividing each second light machine is adopted according to any one of claims 1 to 5, wherein a plurality of second light machines are arranged along the radial direction of the annular region to be divided, and the number of the second light machines is calculated according to the annular region to be divided and the projection area of the light machines.
7. The utility model provides a rotation type section segmentation system based on single ray apparatus which characterized in that includes:
the establishing module is used for establishing an equipment coordinate system by taking the gravity center point of the optical machine effective projection rectangle as a first origin, and establishing a global coordinate system by taking the gravity center point of the input image as a second origin;
the calculation module is used for calculating and adjusting the single rotation amount of the effective projection rectangle of the optical machine;
the conversion module is used for carrying out coordinate system conversion on the annular region to be segmented under the global coordinate system according to the equipment coordinate system, wherein the annular region to be segmented is obtained according to an input image;
and the segmentation module is used for segmenting the region to be segmented converted based on the coordinate system based on the single rotation amount.
8. The rotary slice segmentation system based on a single optical machine as claimed in claim 7, wherein the obtaining the annular region to be segmented according to the input image comprises:
and dividing the input image in an effective circular ring mode, and determining the image belonging to the inner part of the circular ring as the annular region to be segmented.
9. A controller comprising a control chip, wherein the control chip is configured to perform the method of any one of claims 1 to 5.
10. A printer comprising any of the controllers recited in claim 9.
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