A DLP-based anti-aliasing printing method, device, equipment and storage medium

Abstract

This invention discloses a DLP-based anti-aliasing printing method, apparatus, device, and storage medium, relating to the field of 3D printing technology. It solves the problems of jagged edges and poor surface smoothness in existing DLP 3D printing devices. The specific technical solution is as follows: First, acquire at least one original slice image of the target model; then, read the image information of the at least one original slice image and perform cross-rendering on the image information to obtain at least one rendered slice image. The image information includes at least vertex, pixel, and size information, and the at least one rendered slice image is a slice image with a different resolution; finally, perform attribute interpolation on the at least one rendered slice image to obtain at least one anti-aliased slice image, which is a slice image with the same resolution and size. This invention improves the model edge information in the target model slice image, smooths the edge contour of each layer, and achieves an anti-aliasing effect.

Description

Technical Field

[0001] This invention relates to the field of 3D printing technology, and specifically to a DLP-based anti-aliasing printing method, apparatus, device, and storage medium. Background Technology

[0002] DLP 3D printing utilizes a DMD (Digital Micromirror Device) to project two-dimensional patterns layer by layer to cure photosensitive resin materials, thus building a three-dimensional model through layer-by-layer stacking. The printing process uses ultraviolet or visible light sources, directly affecting the curing effect. Unlike laser and other photopolymer printing methods, DLP technology offers advantages such as fast imaging speed, large area, and high resolution. Currently, DLP 3D printers are used in dental, jewelry, and industrial fields. This technology requires close collaboration with a computer during application, allowing the computer to autonomously cut the pre-formed 3D model of the part according to the required thickness for product manufacturing.

[0003] The 3D printing process begins by obtaining a 3D CAD model of the part, which is then sliced ​​into layers. A printing strategy is planned, and each layer is cured by flat exposure, with additive manufacturing processes to ultimately produce the desired printed component. However, traditional slicing strategies are relatively simple and result in coarse model processing. The model is processed into a geometric model in the computer, losing edge smoothness. During the slicing process, it is rasterized into straight lines or jagged edges, failing to achieve the expected surface smoothness after printing. Summary of the Invention

[0004] This invention provides a DLP-based anti-aliasing printing method, apparatus, device, and storage medium, which can solve the problems of jagged edges and poor surface smoothness in existing DLP 3D printed devices. The technical solution is as follows:

[0005] According to a first aspect of the present invention, a DLP-based anti-aliasing printing method is provided, the method comprising:

[0006] Obtain at least one original slice image of the target model;

[0007] Read the image information of the at least one original slice image and perform cross-rendering on the image information to obtain at least one rendered slice image. The image information includes at least vertex, pixel and size information. The at least one rendered slice image is a slice image with different resolutions.

[0008] Attribute interpolation is performed on the at least one rendered slice image to obtain at least one anti-aliased slice image, wherein the at least one anti-aliased slice image is a slice image with the same resolution and size.

[0009] The anti-aliasing printing method based on DLP provided in this invention first acquires at least one original slice image of the target model; then, it reads the image information of the at least one original slice image and performs cross-rendering on the image information to obtain at least one rendered slice image. The image information includes at least vertex, pixel, and size information, and the at least one rendered slice image is a slice image with a different resolution; finally, it performs attribute interpolation on the at least one rendered slice image to obtain at least one anti-aliased slice image, which is a slice image with the same resolution and size. This invention uses cross-rendering to render and draw different layers of slice images on canvases at different magnifications, so that the model outlines in different slice images overlap or show different arrangements. This increases the number of pixels at the edges of the model in the slice images to a certain extent. Through the layer-by-layer overlay of DLP 3D printing, the edge pixel information is superimposed, and the edges of the target model show more details. This also filters out the superposition of single errors that cause the appearance of side edge vertical lines to a certain extent. For attribute interpolation, based on image processing principles, bilinear quadratic interpolation is used to smooth and optimize pixel grayscale values ​​to a certain extent. This smooths out distortions that occur during rasterization, resulting in smoother edges in the target model slice image. The combined effect of these two processing methods improves the edge information of the target model slice image, smooths the contours of each edge layer, and achieves an anti-aliasing effect.

[0010] As a further aspect of the present invention: obtaining the original slice image of the target model specifically includes:

[0011] The target model is sliced ​​to obtain the original sliced ​​image.

[0012] As a further aspect of the present invention: the step of 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:

[0013] Read the image information of the at least one original slice image;

[0014] The at least one rendered slice image is obtained by drawing a resolution canvas on the odd-numbered and even-numbered layers of the at least one original slice image using different magnification ratios.

[0015] As a further aspect of the present invention: the step of drawing a resolution canvas by applying different magnifications to the odd-numbered and even-numbered layers in the at least one original slice image includes:

[0016] For the at least one original slice image, odd-numbered layers are rendered using a canvas with 4 times the rendering resolution, and even-numbered layers are rendered using a canvas with 8 times the rendering resolution.

[0017] As a further aspect of the present invention: the step of performing attribute interpolation on the at least one rendered slice image to obtain at least one anti-aliased slice image specifically includes:

[0018] Based on the bilinear quadratic interpolation function, attribute interpolation is performed on each image in the at least one rendered slice image to change the grayscale value of the outline edge pixels, thereby obtaining the at least one anti-aliased slice image.

[0019] As a further aspect of the present invention, the method further includes:

[0020] Adjusting the optical engine parameters for DLP printing;

[0021] The at least one anti-aliased slice image is printed according to the parameters.

[0022] As a further aspect of the present invention: the debugging parameters include:

[0023] The exposure time of the DLP printer's optical engine was set to 15–25 seconds, and the exposure intensity to 150–200 mW / cm². 2 The layer thickness is 20-30 μm, and the scraper moving speed is 500-1000 mm / min.

[0024] According to a second aspect of the present invention, a DLP-based anti-aliasing printing apparatus is provided, comprising an acquisition module, a rendering module, and an optimization module;

[0025] The acquisition module is used to acquire at least one original slice image of the target model;

[0026] The rendering module is used to read the image information of the at least one original slice image and perform cross-rendering on the image information to obtain at least one rendered slice image. The image information includes at least vertex, pixel and size information, and the at least one rendered slice image is a slice image with different resolutions.

[0027] The optimization module is used to perform attribute interpolation on the at least one rendered slice image to obtain at least one anti-aliased slice image, wherein the at least one anti-aliased slice image is a slice image with the same resolution and size.

[0028] The anti-aliasing printing device based on DLP provided in this invention includes 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 the image information of the at least one original slice image and performs cross-rendering on the image information to obtain at least one rendered slice image. The image information includes at least vertex, pixel, 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 the at least one rendered slice image to obtain at least one anti-aliased slice image, and the at least one anti-aliased slice image is a slice image with the same resolution and size. This invention uses cross-rendering to render and draw slice images of different layers at different magnifications, so that the model outlines in different slice images overlap or show different arrangements. This increases the number of pixels at the edges of the model in the slice images to a certain extent. Through the layer-by-layer coverage of DLP 3D printing, the edge pixel information is superimposed, and the edges of the target model show more details. This also filters out the superposition of single errors that cause the appearance of side edge vertical lines to a certain extent. For attribute interpolation, based on image processing principles, bilinear quadratic interpolation is used to smooth and optimize pixel grayscale values ​​to a certain extent. This smooths out distortions that occur during rasterization, resulting in smoother edges in the target model slice image. The combined effect of these two processing methods improves the edge information of the target model slice image, smooths the contours of each edge layer, and achieves an anti-aliasing effect.

[0029] According to a third aspect of the present invention, a DLP-based anti-aliasing printing apparatus is provided, the DLP-based anti-aliasing printing apparatus comprising a processor and a memory, the memory storing at least one computer instruction, the instruction being loaded and executed by the processor to perform the steps performed in any of the preceding DLP-based anti-aliasing printing methods.

[0030] According to a fourth aspect of the present invention, a computer-readable storage medium is provided, the storage medium storing at least one computer instruction, the instruction being loaded and executed by a processor to perform the steps performed in the DLP-based anti-aliasing printing method described in any of the preceding claims.

[0031] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit the invention. Attached Figure Description

[0032] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0033] Figure 1This is a flowchart of a DLP-based anti-aliasing printing method provided in an embodiment of the present invention;

[0034] Figure 2 This invention provides the pixel arrangement and cross-rendering results of output slices for odd and even layers under different resolution canvases.

[0035] Figure 3 This is a comparison image of the edge contours before and after optimization using bilinear quadratic interpolation, provided in an embodiment of the present invention.

[0036] Figure 4 These are comparison images of printing results provided in embodiments of the present invention;

[0037] Figure 5 This is a structural diagram of a DLP-based anti-aliasing printing device provided in an embodiment of the present invention. Detailed Implementation

[0038] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of systems and methods consistent with some aspects of the invention as detailed in the appended claims.

[0039] This invention provides a DLP-based anti-aliasing printing method, such as... Figure 1 As shown, it includes the following steps:

[0040] Step 101: Obtain at least one original slice image of the target model.

[0041] Specifically, the target model is the 3D model of the device to be printed.

[0042] In one embodiment, obtaining the original slice image of the target model specifically includes:

[0043] The target model is sliced ​​to obtain the original sliced ​​image.

[0044] In practical use, the target model is imported into a sunken DLP printer system equipped with an independent slicing and printing system, where it is sliced ​​and the sliced ​​images are exported.

[0045] Step 102: Read the 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.

[0046] Specifically, the image information includes at least vertex, pixel, and size information, and at least one rendered slice image is a slice image with different resolutions.

[0047] In one embodiment, reading image information from at least one original slice image and performing cross-rendering on the image information to obtain at least one rendered slice image specifically includes:

[0048] Read image information from at least one original slice image;

[0049] At least one rendered slice image is obtained by drawing a resolution canvas on the odd-numbered and even-numbered layers of at least one original slice image using different magnifications.

[0050] Specifically, the process of rendering a resolution canvas at different magnifications for odd-numbered and even-numbered layers in at least one original slice image includes:

[0051] For at least one original slice image, odd-numbered layers are rendered using a canvas with 4 times the rendering resolution, and even-numbered layers are rendered using a canvas with 8 times the rendering resolution.

[0052] In practical use, image information is read from the sliced ​​images of the target model through digital image processing. A cross-rendering ratio method is adopted, with different layers rendered using different resolution ratios. Edge detail filtering is performed on the contour edges of the sliced ​​images of the target model. Specifically, odd-numbered sliced ​​images are drawn using a 4x resolution canvas, while even-numbered sliced ​​images are drawn using an 8x resolution canvas.

[0053] like Figure 2 As shown in the figure, 'a' represents the pixel arrangement of the output slices from odd-numbered layers at 4x resolution, 'b' represents the pixel arrangement of the output slices from even-numbered layers at 8x resolution, and 'c' represents the cross-rendering result of odd and even layers. The figure demonstrates that, depending on the number of odd or even layers, different resolution canvases are used to render slice images of a typical curved circular model. These slice images are sequentially printed and superimposed by the printer's optical engine. The different pixel arrangements in each layer allow for some degree of edge pixel complementarity.

[0054] Step 103: Perform attribute interpolation on at least one rendered slice image to obtain at least one anti-aliased slice image.

[0055] Among them, at least one anti-aliased slice image is a slice image with the same resolution and size.

[0056] In this embodiment, performing attribute interpolation on at least one rendered slice image to obtain at least one anti-aliased slice image specifically includes:

[0057] Based on the bilinear quadratic interpolation function, attribute interpolation is performed on each image in at least one rendered slice image to change the grayscale value of the outline edge pixels, thereby obtaining at least one anti-aliased slice image.

[0058] Specifically, bilinear quadratic interpolation is an interpolation algorithm used in image processing. Its basic principle is: for the four neighboring pixels in the neighborhood of the point to be interpolated in the image, first perform one-dimensional linear interpolation in the horizontal direction to obtain two intermediate values; then perform one-dimensional linear interpolation in the vertical direction on these two intermediate values ​​to obtain the final interpolated pixel value. In step 102, canvases with different magnification resolutions are used to draw each slice of the target model. Since the print sizes of the slice images are different, the output needs to be a two-dimensional image of the target model with the same resolution as the printer's print size. During this process, the slice images need to be scaled. For example... Figure 3 As shown, where a is the optimized edge contour map and b is the unoptimized edge contour map, based on cross-rendering, bilinear quadratic interpolation is used to optimize the slices of a general arc-shaped circular model. As can be seen from the magnified image edge contour, the jagged edge spacing is significantly reduced after optimization. Figure 4 As shown, where a is the unoptimized printing result and b is the optimized printing result, when printing a general arc-shaped circular model according to the method provided by the present invention, it can be clearly seen that: compared with Figure a, after optimization by the method of the present invention, the jagged edges of the model in Figure b are reduced and tend to be smoothly distributed, achieving an anti-aliasing effect to a certain extent.

[0059] In one embodiment, the above method further includes:

[0060] Adjusting the optical engine parameters for DLP printing;

[0061] Print at least one anti-aliased slice image according to the parameters.

[0062] In actual use, the DLP printer is a recessed DLP printer equipped with an independent slicing and printing integrated system. The specific parameters include exposure time, exposure intensity, layer thickness and squeegee movement speed.

[0063] In one embodiment, the debugging parameters include:

[0064] The exposure time for adjusting the DLP printer's optical engine is 15–25 seconds, and the exposure intensity is 150–200 mW / cm². 2 The layer thickness is 20-30 μm, and the scraper moving speed is 500-1000 mm / min.

[0065] Specifically, the exposure time can be 15s, 20s, or 25s; the exposure intensity can be 150mW / cm². 2 200mW / cm 2 The layer thickness can be 20μm or 30μm; the scraper movement speed can be 500mm / min or 1000mm / min. For example, in one embodiment, the exposure time is set to 20s; the exposure intensity is 150mW / cm².2 The layer thickness is 30μm; the scraper moving speed is 1000mm / min.

[0066] The anti-aliasing printing method based on DLP provided in this invention first acquires at least one original slice image of the target model; then, it reads the image information of the at least one original slice image and performs cross-rendering on the image information to obtain at least one rendered slice image. The image information includes at least vertex, pixel, and size information, and the at least one rendered slice image is a slice image with a different resolution; finally, it performs attribute interpolation on the at least one rendered slice image to obtain at least one anti-aliased slice image, which is a slice image with the same resolution and size. This invention uses cross-rendering to render and draw different layers of slice images on canvases at different magnifications, so that the model outlines in different slice images overlap or show different arrangements. This increases the number of pixels at the edges of the model in the slice images to a certain extent. Through the layer-by-layer overlay of DLP 3D printing, the edge pixel information is superimposed, and the edges of the target model show more details. This also filters out the superposition of single errors that cause the appearance of side edge vertical lines to a certain extent. For attribute interpolation, based on image processing principles, bilinear quadratic interpolation is used to smooth and optimize pixel grayscale values ​​to a certain extent. This smooths out distortions that occur during rasterization, resulting in smoother edges in the target model slice image. The combined effect of these two processing methods improves the edge information of the target model slice image, smooths the contours of each edge layer, and achieves an anti-aliasing effect.

[0067] Based on the above Figure 1 The anti-aliasing printing method based on DLP described in the corresponding embodiments is described below as a system embodiment of the present invention, which can be used to execute the method embodiment of the present invention.

[0068] This invention provides a DLP-based anti-aliasing printing device, such as... Figure 5 As shown, the device includes an acquisition module 201, a rendering module 202, and an optimization module 203;

[0069] The acquisition module 201 is used to acquire at least one original slice image of the target model;

[0070] The rendering module 202 is used to read the 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. The image information includes at least vertex, pixel and size information, and the at least one rendered slice image is a slice image with different resolutions.

[0071] The optimization module 203 is used to perform attribute interpolation on at least one rendered slice image to obtain at least one anti-aliased slice image, wherein the at least one anti-aliased slice image is a slice image with the same resolution and size.

[0072] This invention provides a DLP-based anti-aliasing printing device, comprising 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 target model; the rendering module 202 reads the image information of the at least one original slice image and performs cross-rendering on the image information to obtain at least one rendered slice image. The image information includes at least vertex, pixel, 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 the at least one rendered slice image to obtain at least one anti-aliased slice image, and the at least one anti-aliased slice image is a slice image with the same resolution and size. This invention uses cross-rendering to render and draw slice images of different layers at different magnifications, causing the model outlines in different slice images to overlap or exhibit different arrangements. This increases the number of pixels at the edges of the model in the slice images to a certain extent. Through layer-by-layer DLP 3D printing, the edge pixel information is superimposed, and the edges of the target model exhibit more detail, filtering out the superposition of single errors that cause side edge vertical lines to a certain extent. For attribute interpolation, based on image processing principles, bilinear quadratic interpolation is used to smooth and optimize pixel grayscale values ​​to a certain extent. This smooths out distortions that occur during rasterization, resulting in smoother edges in the target model slice image. The combined effect of these two processing methods improves the edge information of the target model slice image, smooths the contours of each edge layer, and achieves an anti-aliasing effect.

[0073] In one embodiment, the acquisition module 201 is specifically used to perform slicing processing on the target model to obtain the original slice image.

[0074] In one embodiment, the rendering module 202 includes a reading unit 2021 and a drawing unit 2022;

[0075] The reading unit 2021 is used to read image information of at least one original slice image;

[0076] The drawing unit 2022 is used to draw resolution canvases on odd-numbered and even-numbered layers in at least one original slice image at different magnifications to obtain at least one rendered slice image.

[0077] In one embodiment, the drawing unit 2022 is specifically used to apply a 4x drawing resolution canvas to odd-numbered layers and an 8x drawing resolution canvas to even-numbered layers in at least one original slice image.

[0078] In one embodiment, the optimization module 203 is specifically used to perform attribute interpolation on each image in at least one rendered slice image according to the bilinear quadratic interpolation function, change the gray value of the outline edge pixels, and obtain at least one anti-aliased slice image.

[0079] In one embodiment, the above-described apparatus further includes a debugging module 204 and a printing module 205;

[0080] Debugging module 204 is used to debug the optical engine parameters of DLP printers;

[0081] Printing module 205 is used to print at least one anti-aliased slice image according to parameters.

[0082] Based on the above Figure 1 In addition to the DLP-based anti-aliasing printing method described in the corresponding embodiments, another embodiment of the present invention also provides a DLP-based anti-aliasing printing device, which includes a processor and a memory. The memory stores at least one computer instruction, which is loaded and executed by the processor to implement the above-described method. Figure 1 The corresponding embodiment describes a DLP-based anti-aliasing printing method.

[0083] Based on the above Figure 1 In addition to the DLP-based anti-aliasing printing method described in the corresponding embodiments, this invention also 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 (RAM), a CD-ROM, magnetic tape, a floppy disk, or an optical data storage device. This storage medium stores at least one computer instruction for executing the above-described... Figure 1 The DLP-based anti-aliasing printing method described in the corresponding embodiments will not be repeated here.

[0084] Other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and practice of the disclosure herein. This application is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of the invention are indicated by the following claims.

[0085] It should be understood that the present invention is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the invention is limited only by the appended claims.

Claims

1. A DLP-based anti-aliasing printing method, characterized in that, The method includes: Obtain at least one original slice image of the target model; The image information of the at least one original slice image is read, and the image information is cross-rendered to obtain at least one rendered slice image. The image information includes at least vertex, pixel and size information. The at least one rendered slice image is a slice image with different resolutions. The odd-numbered layers and even-numbered layers in the at least one original slice image are drawn with different resolution canvases. The odd-numbered layers are drawn with a resolution canvas of 4 times, and the even-numbered layers are drawn with a resolution canvas of 8 times. According to the bilinear quadratic interpolation function, attribute interpolation is performed on each image in the at least one rendered slice image, and the gray value of the outline edge pixel is changed to obtain at least one anti-aliased slice image. The at least one anti-aliased slice image is a slice image with the same resolution and size.

2. The DLP-based anti-aliasing printing method according to claim 1, characterized in that, The process of obtaining the original slice image of the target model specifically includes: The target model is sliced ​​to obtain the original sliced ​​image.

3. The DLP-based anti-aliasing printing method according to claim 1, characterized in that, The method includes: Adjusting the optical engine parameters for DLP printing; The at least one anti-aliased slice image is printed according to the parameters.

4. The DLP-based anti-aliasing printing method according to claim 3, characterized in that, The debugging parameters include: The exposure time of the DLP printer optical engine was adjusted to 15-25 seconds, and the exposure intensity to 150-200 mW / cm². 2 The layer thickness is 20~30 μm, and the scraper moving speed is 500~1000 mm / min.

5. A DLP-based anti-aliasing printing device, characterized in that, include: Acquisition module, rendering module, and optimization module; The acquisition module is used to acquire at least one original slice image of the target model; The rendering module is used to read the image information of the at least one original slice image and perform cross-rendering on the image information to obtain at least one rendered slice image. The image information includes at least vertex, pixel and size information. The at least one rendered slice image is a slice image with different resolutions. Specifically, the odd-numbered layers and even-numbered layers in the at least one original slice image are drawn with different resolution canvases. The odd-numbered layers are drawn with a resolution canvas of 4 times, and the even-numbered layers are drawn with a resolution canvas of 8 times. The optimization module is used to perform attribute interpolation on each image in the at least one rendered slice image according to the bilinear quadratic interpolation function, change the gray value of the outline edge pixels, and obtain at least one anti-aliased slice image, wherein the at least one anti-aliased slice image is a slice image with the same resolution and size.

6. A DLP-based anti-aliasing printing device, characterized in that, The DLP-based anti-aliasing printing device includes a processor and a memory, the memory storing at least one computer instruction, which is loaded and executed by the processor to perform the steps in the DLP-based anti-aliasing printing method according to any one of claims 1 to 4.

7. A computer-readable storage medium, characterized in that, The storage medium stores at least one computer instruction, which is loaded and executed by a processor to perform the steps in the DLP-based anti-aliasing printing method according to any one of claims 1 to 4.

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