CN117183336A - Anti-aliasing printing method, device, equipment and storage medium based on DLP - Google Patents
Anti-aliasing printing method, device, equipment and storage medium based on DLP Download PDFInfo
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Abstract
The application discloses an anti-aliasing printing method, device, equipment and storage medium based on DLP, relates to the technical field of 3D printing, and can solve the problems that a DLP 3D printing device in the prior art generates aliasing and has poor surface smoothness. The specific technical scheme is as follows: firstly, at least one original slice image of a target model is acquired; then reading image information of at least one original slice image, and performing cross rendering on the image information to obtain at least one rendered slice image, wherein the image information at least comprises vertexes, pixels and size information, and the at least one rendered slice image is a slice image with different resolutions; and finally, performing attribute interpolation on at least one rendering slice image to obtain at least one antialiasing slice image, wherein the at least one antialiasing slice image is a slice image with the same resolution and size. The application improves the model edge information in the slice image of the target model, smoothes the edge contour of each layer and achieves the anti-aliasing effect.
Description
Technical Field
The application relates to the technical field of 3D printing, in particular to an anti-aliasing printing method, device and equipment based on DLP and a storage medium.
Background
The DLP 3D printing is to utilize DMD digital micromirror equipment to project a two-dimensional pattern layer by layer to solidify photosensitive resin materials, so that a three-dimensional model is constructed layer by layer in a stacking way. The printing process uses a light source in the ultraviolet or visible light band to directly influence the curing effect. Unlike other photo-curing printing such as laser, the DLP technology has the advantages of high imaging speed, large area, high resolution and the like. Currently, DLP 3D printers are applied to the fields of dentistry, jewelry, industry, etc. In the application process, the technology needs to be closely matched by adopting an electronic computer, and the 3D model which is already shaped into the part can be automatically cut according to the thickness required by the production design of the product by the electronic computer.
The 3D printing process is to obtain a three-dimensional CAD model of the part, perform layering slicing treatment on the model, then plan a printing strategy, perform each layer of flat exposure and solidification, add materials and stack, and finally obtain the firmware to be printed. However, conventional slicing strategies are relatively simple and the model process is rough, the model is processed in a computer to a geometric model, the edge smoothness is lost, the model is further rasterized into a straight line during slicing, or jaggies are generated, and the desired surface smoothness is not achieved after printing the molded device.
Disclosure of Invention
The embodiment of the application provides an anti-aliasing printing method, device, equipment and storage medium based on DLP, which can solve the problems of aliasing and poor surface smoothness of a DLP 3D printing device in the prior art. The technical scheme is as follows:
according to a first aspect of an embodiment of the present application, there is provided a DLP-based antialiasing printing method, the method comprising:
acquiring at least one original slice image of a target model;
reading image information of the at least one original slice image, and performing cross rendering on the image information to obtain at least one rendered slice image, wherein the image information at least comprises vertexes, pixels and size information, and the at least one rendered slice image is a slice image with different resolutions;
and performing attribute interpolation on the at least one rendering slice image to obtain at least one antialiasing slice image, wherein the at least one antialiasing slice image is a slice image with the same resolution and size.
The anti-aliasing printing method based on DLP provided by the embodiment of the application comprises the steps of firstly obtaining at least one original slice image of a target model; then reading image information of at least one original slice image, and performing cross rendering on the image information to obtain at least one rendered slice image, wherein the image information at least comprises vertexes, pixels and size information, and the at least one rendered slice image is a slice image with different resolutions; and finally, performing attribute interpolation on at least one rendering slice image to obtain at least one antialiasing slice image, wherein the at least one antialiasing slice image is a slice image with the same resolution and size. According to the application, rendering drawing of canvases with different multiplying powers is carried out on slice images of different layers in a cross rendering mode, so that model contours in different slice images are mutually covered or are arranged differently, pixels at the edges of the models in the slice images are increased to a certain extent, edge pixel information is overlapped through DLP 3D printing layer coverage, the edges of a target model show more details, single error overlapping is filtered to a certain extent, and side edge vertical lines are caused. On the aspect of attribute interpolation, based on the technical principle of image processing, bilinear quadratic interpolation is used, pixel gray values are subjected to certain-degree smooth optimization, distortion in the rasterization process is caused, and model edges in a target model slice image have certain smoothness through the smooth gray values to a certain extent. Under the combined action of the two processing modes, the model edge information in the target model slice image is improved, the edge contour of each layer is smoothed, and the anti-aliasing effect is achieved.
As still further aspects of the application: the obtaining the original slice image of the target model specifically includes:
and carrying out slicing treatment on the target model to obtain the original slice image.
As still further aspects of the application: the reading the image information of the at least one original slice image, and performing cross rendering on the image information to obtain at least one rendered slice image specifically includes:
reading image information of the at least one original slice image;
and drawing resolution canvases with different multiplying powers on an odd layer and an even layer in the at least one original slice image respectively to obtain the at least one rendering slice image.
As still further aspects of the application: the drawing the resolution canvas by adopting different multiplying powers for the odd layer and the even layer in the at least one original slice image respectively comprises:
and drawing the resolution canvas for the odd layers in the at least one original slice image by 4 times, and drawing the resolution canvas for the even layers by 8 times.
As still further aspects of the application: the performing attribute interpolation on the at least one rendering slice image to obtain at least one antialiasing slice image specifically includes:
and carrying out attribute interpolation on each image in the at least one rendering slice image according to the bilinear quadratic interpolation function, and changing the gray value of the pixel point of the contour edge to obtain the at least one antialiasing slice image.
As still further aspects of the application: the method further comprises the steps of:
debugging DLP printing optical machine parameters;
and printing and forming the at least one antialiased slice image according to the parameters.
As still further aspects of the application: the debugging parameters include:
the exposure time of the DLP printing optical machine is adjusted to be 15-25 s, and the exposure intensity is adjusted to be 150-200 mW/cm 2 The thickness of the layer is 20-30 mu m, and the moving speed of the scraper is 500-1000 mm/min.
According to a second aspect of an embodiment of the present application, there is provided a DLP-based antialiasing printing apparatus, including an acquisition module, a rendering module, and an optimization module;
the acquisition module is used for acquiring at least one original slice image of the target model;
the rendering module is used for reading the image information of the at least one original slice image, and performing cross rendering on the image information to obtain at least one rendered slice image, wherein the image information at least comprises vertexes, pixels and size information, and the at least one rendered slice image is a slice image with different resolutions;
the optimization module is configured to perform attribute interpolation on the at least one rendered slice image to obtain at least one antialiased slice image, where the at least one antialiased slice image is a slice image with the same resolution and size.
The anti-aliasing printing device based on the DLP provided by the embodiment of the application comprises an acquisition module, a rendering module and an optimization module; the acquisition module acquires at least one original slice image of the target model; the rendering module reads image information of at least one original slice image, and performs cross rendering on the image information to obtain at least one rendered slice image, wherein the image information at least comprises vertexes, pixels and size information, and the at least one rendered slice image is a slice image with different resolutions; the optimization module performs attribute interpolation on at least one rendering slice image to obtain at least one antialiasing slice image, wherein the at least one antialiasing slice image is a slice image with the same resolution and size. According to the application, rendering drawing of canvases with different multiplying powers is carried out on slice images of different layers in a cross rendering mode, so that model contours in different slice images are mutually covered or are arranged differently, pixels at the edges of the models in the slice images are increased to a certain extent, edge pixel information is overlapped through DLP 3D printing layer coverage, the edges of a target model show more details, single error overlapping is filtered to a certain extent, and side edge vertical lines are caused. On the aspect of attribute interpolation, based on the technical principle of image processing, bilinear quadratic interpolation is used, pixel gray values are subjected to certain-degree smooth optimization, distortion in the rasterization process is caused, and model edges in a target model slice image have certain smoothness through the smooth gray values to a certain extent. Under the combined action of the two processing modes, the model edge information in the target model slice image is improved, the edge contour of each layer is smoothed, and the anti-aliasing effect is achieved.
According to a third aspect of embodiments of the present application, there is provided a DLP-based antialiasing printing apparatus comprising a processor and a memory having stored therein at least one computer instruction that is loaded and executed by the processor to implement the steps performed in the DLP-based antialiasing printing method as described in any of the above.
According to a fourth aspect of embodiments of the present application, there is provided a computer readable storage medium having stored therein at least one computer instruction loaded and executed by a processor to implement the steps performed in the DLP-based antialiasing printing method as described in any of the above.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application as claimed.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description, serve to explain the principles of the application.
FIG. 1 is a flow chart of a DLP based antialiasing printing method provided by an embodiment of the present application;
FIG. 2 is a block diagram of pixel arrangements and cross rendering results for output slices of odd and even layers under different resolution canvases according to an embodiment of the present application;
FIG. 3 is a graph of edge contour comparisons before and after optimization using bilinear quadratic interpolation provided by an embodiment of the present application;
FIG. 4 is a graph showing a comparison of print results provided by an embodiment of the present application;
fig. 5 is a block diagram of an anti-aliasing printing device based on DLP according to an embodiment of the present application.
Detailed Description
Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations consistent with the application. Rather, they are merely examples of systems and methods that are consistent with aspects of the application as detailed in the accompanying claims.
The embodiment of the application provides an anti-aliasing printing method based on DLP, as shown in FIG. 1, comprising the following steps:
step 101, at least one original slice image of the target model is acquired.
Specifically, the target model is a 3D model of the device to be printed.
In one embodiment, acquiring the original slice image of the object model specifically includes:
and performing slicing treatment on the target model to obtain an original slice image.
In practical use, the object model is introduced into a submerged DLP printer system equipped with an independent slicing and printing integrated system, slicing processing is performed, and slice images are derived.
And 102, reading image information of at least one original slice image, and performing cross rendering on the image information to obtain at least one rendered slice image.
Specifically, the image information includes at least vertices, pixels, and size information, and at least one of the rendered slice images is a slice image having a different resolution.
In one embodiment, reading image information of at least one original slice image, and performing cross-rendering on the image information to obtain at least one rendered slice image specifically includes:
reading image information of at least one original slice image;
and drawing resolution canvases with different multiplying powers on an odd layer and an even layer in at least one original slice image respectively to obtain at least one rendering slice image.
Specifically, drawing the resolution canvas by adopting different multiplying powers for the odd layer and the even layer in at least one original slice image respectively comprises:
a4-fold rendering resolution canvas is employed for an odd layer in at least one original slice image, and an 8-fold rendering resolution canvas is employed for an even layer.
In actual use, image information of slice images of a target model is read through digital image processing, a cross rendering multiplying power mode is adopted, different layers are rendered by using different resolution multiplying powers, edge detail filtering is carried out on contour edges of slice images of the target model, specifically, 4 times resolution canvas is used for drawing slice images of odd layers, and 8 times resolution canvas is used for drawing slice images of even layers.
As shown in fig. 2, where a is the pixel arrangement of the output slice of the odd layer under the 4-fold resolution canvas, b is the pixel arrangement of the output slice of the even layer under the 8-fold resolution canvas, and c is the cross rendering result of the odd layer and the even layer. According to the different parity layers, canvas with different multiplying power resolutions is used for rendering slice images of a common radian wafer model, the slice images are sequentially printed and overlapped by a light machine of a printer, and edge pixel complementation can be performed to a certain extent through different layer pixel arrangements.
And 103, performing attribute interpolation on at least one rendering slice image to obtain at least one antialiasing slice image.
Wherein the at least one antialiased slice image is a uniformly sized slice image of equal resolution.
In this embodiment, performing attribute interpolation on at least one rendering slice image to obtain at least one antialiasing slice image specifically includes:
and carrying out attribute interpolation on each image in at least one rendering slice image according to the bilinear quadratic interpolation function, and changing the gray value of the pixel point of the contour edge to obtain at least one antialiased slice image.
Specifically, bilinear quadratic interpolation is an interpolation algorithm applied to image processing, and the basic principle is as follows: 4 adjacent pixel points in the neighborhood of the point to be interpolated on the image are subjected to one-dimensional linear interpolation in the horizontal direction to obtain 2 intermediate values; and then carrying out one-dimensional linear interpolation on the 2 intermediate values in the vertical direction to obtain a final interpolation pixel value. In step 102, canvas with different multiplying power resolutions is used to draw each layer of slice image of the target model, at this time, the print sizes of the slice images are different, two-dimensional images of the target model with the same resolution need to be output for printing by a printer, and in this process, the slice images need to be scaled. As shown in fig. 3, a is an optimized edge contour map, b is an un-optimized edge contour map, and on the basis of cross rendering, slices of a wafer model with a common radian are optimized by bilinear quadratic interpolation, and as can be seen from the edge contour of an enlarged image, the sawtooth spacing of the optimized edge is obviously reduced. As shown in fig. 4, where a is an unoptimized printing result, and b is a printing result after optimization processing, it can be clearly seen that the method provided by the present application performs printing forming of a general radian wafer model: compared with the graph a, after the optimization treatment by the method, the edge saw teeth of the graph b model are reduced and tend to be distributed smoothly, so that the anti-saw tooth effect is achieved to a certain extent.
In one embodiment, the method further comprises:
debugging DLP printing optical machine parameters;
and printing and forming at least one antialiased slice image according to the parameters.
In practical use, the DLP printing optical machine is a sinking DLP printer provided with an independent slicing and printing integrated system, and the parameters specifically comprise exposure time, exposure intensity, layer thickness and scraper moving speed.
In one embodiment, the debug parameters include:
the exposure time for debugging the DLP printing optical machine is 15-25 s, and the exposure intensity is 150-200 mW/cm 2 The thickness of the layer is 20-30 mu m, and the moving speed of the scraper is 500-1000 mm/min.
Specifically, the exposure time may be 15s,20s,25s; the exposure intensity can be 150mW/cm 2 ，200mW/cm 2 The method comprises the steps of carrying out a first treatment on the surface of the The layer thickness may be 20 μm,30 μm; the scraper movement may be at a speed of 500mm/min,1000mm/min. For example, in one embodiment, the exposure time is set to 20s; the exposure intensity was 150mW/cm 2 The method comprises the steps of carrying out a first treatment on the surface of the The layer thickness is 30 μm; the doctor blade moving speed was 1000mm/min.
The anti-aliasing printing method based on DLP provided by the embodiment of the application comprises the steps of firstly obtaining at least one original slice image of a target model; then reading image information of at least one original slice image, and performing cross rendering on the image information to obtain at least one rendered slice image, wherein the image information at least comprises vertexes, pixels and size information, and the at least one rendered slice image is a slice image with different resolutions; and finally, performing attribute interpolation on at least one rendering slice image to obtain at least one antialiasing slice image, wherein the at least one antialiasing slice image is a slice image with the same resolution and size. According to the application, rendering drawing of canvases with different multiplying powers is carried out on slice images of different layers in a cross rendering mode, so that model contours in different slice images are mutually covered or are arranged differently, pixels at the edges of the models in the slice images are increased to a certain extent, edge pixel information is overlapped through DLP 3D printing layer coverage, the edges of a target model show more details, single error overlapping is filtered to a certain extent, and side edge vertical lines are caused. On the aspect of attribute interpolation, based on the technical principle of image processing, bilinear quadratic interpolation is used, pixel gray values are subjected to certain-degree smooth optimization, distortion in the rasterization process is caused, and model edges in a target model slice image have certain smoothness through the smooth gray values to a certain extent. Under the combined action of the two processing modes, the model edge information in the target model slice image is improved, the edge contour of each layer is smoothed, and the anti-aliasing effect is achieved.
Based on the DLP-based antialiasing printing method described in the above-described embodiment corresponding to fig. 1, the following is an embodiment of the system of the present application, which may be used to perform an embodiment of the method of the present application.
The embodiment of the application provides an anti-aliasing printing device based on DLP, which comprises an acquisition module 201, a rendering module 202 and an optimization module 203 as shown in FIG. 5;
an acquisition module 201 for acquiring at least one original slice image of the object model;
the rendering module 202 is configured to read image information of at least one original slice image, and perform cross rendering on the image information to obtain at least one rendered slice image, where the image information at least includes vertices, pixels, and size information, and the at least one rendered slice image is a slice image with different resolutions;
the optimizing module 203 is configured to perform attribute interpolation on at least one rendered slice image to obtain at least one antialiased slice image, where the at least one antialiased slice image is a slice image with a resolution and a same size.
The anti-aliasing printing device based on DLP provided by the embodiment of the application comprises an acquisition module 201, a rendering module 202 and an optimization module 203. The acquisition module 201 acquires at least one original slice image of the object model; the rendering module 202 reads image information of at least one original slice image, and performs cross rendering on the image information to obtain at least one rendered slice image, wherein the image information at least comprises vertexes, pixels and size information, and the at least one rendered slice image is a slice image with different resolutions; the optimization module 203 performs attribute interpolation on at least one of the rendered slice images to obtain at least one antialiased slice image, where the at least one antialiased slice image is a slice image with the same resolution and size. According to the application, rendering drawing of canvases with different multiplying powers is carried out on slice images of different layers in a cross rendering mode, so that model contours in different slice images are mutually covered or are arranged differently, pixels at the edges of the models in the slice images are increased to a certain extent, edge pixel information is overlapped through DLP 3D printing layer coverage, the edges of a target model show more details, single error overlapping is filtered to a certain extent, and side edge vertical lines are caused. On the aspect of attribute interpolation, based on the technical principle of image processing, bilinear quadratic interpolation is used, pixel gray values are subjected to certain-degree smooth optimization, distortion in the rasterization process is caused, and model edges in a target model slice image have certain smoothness through the smooth gray values to a certain extent. Under the combined action of the two processing modes, the model edge information in the target model slice image is improved, the edge contour of each layer is smoothed, and the anti-aliasing effect is achieved.
In one embodiment, the obtaining module 201 is specifically configured to perform slicing processing on the object model, and obtain an original slice image.
In one embodiment, the rendering module 202 includes a reading unit 2021 and a drawing unit 2022;
a reading unit 2021 for reading image information of at least one original slice image;
and a drawing unit 2022, configured to draw resolution canvases with different magnifications for odd layers and even layers in at least one original slice image, respectively, to obtain at least one rendered slice image.
In one embodiment, the drawing unit 2022 is specifically configured to use a 4-fold drawing resolution canvas for an odd layer and an 8-fold drawing resolution canvas for an even layer in at least one original slice image.
In one embodiment, the optimization module 203 is specifically configured to perform attribute interpolation on each of the at least one rendered slice image according to a bilinear quadratic interpolation function, and change a gray value of a pixel point of a contour edge to obtain at least one antialiased slice image.
In one embodiment, the apparatus further comprises a debug module 204 and a print module 205;
a debugging module 204, configured to debug the DLP printer parameters;
and a printing module 205, configured to print and shape the at least one antialiased slice image according to the parameters.
Based on the above-described anti-aliasing printing method based on DLP described in the corresponding embodiment of fig. 1, another embodiment of the present application further provides an anti-aliasing printing device based on DLP, which comprises a processor and a memory in which at least one computer instruction is stored, which is loaded and executed by the processor to implement the anti-aliasing printing method based on DLP described in the corresponding embodiment of fig. 1.
Based on the anti-aliasing printing method based on DLP described in the corresponding embodiment of fig. 1, the embodiment of the present application further provides a computer readable storage medium, for example, a non-transitory computer readable storage medium may be a Read Only Memory (ROM), a random access Memory (RandomAccess Memory, RAM), a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, and the like. The storage medium has at least one computer instruction stored thereon for executing the DLP-based antialiasing printing method described in the above-described embodiment corresponding to fig. 1, which is not described herein.
Other embodiments of the application will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the application following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the application pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.
It is to be understood that the application is not limited to the precise arrangements and instrumentalities shown in the drawings, which have been described above, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the application is limited only by the appended claims.
Claims (10)
1. A DLP-based antialiasing printing method, the method comprising:
acquiring at least one original slice image of a target model;
reading image information of the at least one original slice image, and performing cross rendering on the image information to obtain at least one rendered slice image, wherein the image information at least comprises vertexes, pixels and size information, and the at least one rendered slice image is a slice image with different resolutions;
and performing attribute interpolation on the at least one rendering slice image to obtain at least one antialiasing slice image, wherein the at least one antialiasing slice image is a slice image with the same resolution and size.
2. The DLP-based antialiasing printing method as claimed in claim 1, characterized in that the acquisition of the original slice image of the object model specifically comprises:
and carrying out slicing treatment on the target model to obtain the original slice image.
3. The DLP-based antialiasing printing method as claimed in claim 1, characterized in that the reading of the image information of the at least one original slice image and the cross-rendering of the image information to obtain at least one rendered slice image specifically comprises:
reading image information of the at least one original slice image;
and drawing resolution canvases with different multiplying powers on an odd layer and an even layer in the at least one original slice image respectively to obtain the at least one rendering slice image.
4. The DLP-based antialiasing printing method as claimed in claim 3, characterized in that said rendering a resolution canvas with different magnifications for odd and even layers, respectively, in said at least one original slice image comprises:
and drawing the resolution canvas for the odd layers in the at least one original slice image by 4 times, and drawing the resolution canvas for the even layers by 8 times.
5. The DLP-based antialiasing printing method as claimed in claim 1, characterized in that said obtaining at least one antialiased slice image by attribute interpolation of the at least one rendered slice image specifically comprises:
and carrying out attribute interpolation on each image in the at least one rendering slice image according to the bilinear quadratic interpolation function, and changing the gray value of the pixel point of the contour edge to obtain the at least one antialiasing slice image.
6. The DLP-based antialiasing printing method as claimed in claim 1, characterized in that the method comprises:
debugging DLP printing optical machine parameters;
and printing and forming the at least one antialiased slice image according to the parameters.
7. The DLP-based antialiasing printing method as claimed in claim 6, characterized in that the debug parameters include:
the exposure time of the DLP printing optical machine is adjusted to be 15-25 s, and the exposure intensity is adjusted to be 150-200 mW/cm 2 The thickness of the layer is 20-30 mu m, and the moving speed of the scraper is 500-1000 mm/min.
8. A DLP-based antialiasing printing apparatus, comprising: the system comprises an acquisition module, a rendering module and an optimization module;
the acquisition module is used for acquiring at least one original slice image of the target model;
the rendering module is used for reading the image information of the at least one original slice image, and performing cross rendering on the image information to obtain at least one rendered slice image, wherein the image information at least comprises vertexes, pixels and size information, and the at least one rendered slice image is a slice image with different resolutions;
the optimization module is configured to perform attribute interpolation on the at least one rendered slice image to obtain at least one antialiased slice image, where the at least one antialiased slice image is a slice image with the same resolution and size.
9. A DLP-based antialiasing printing apparatus, characterized in that it comprises a processor and a memory, in which at least one computer instruction is stored, which is loaded and executed by the processor to implement the steps performed in the DLP-based antialiasing printing method as claimed in any of claims 1 to 7.
10. A computer readable storage medium having stored therein at least one computer instruction loaded and executed by a processor to implement the steps performed in the DLP-based antialiasing printing method as recited in any of claims 1 to 7.
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