Method for printing planar color content by layered color mixing with an fdm printer based on a multilayer color inverse solving algorithm

Abstract

The invention discloses a method for carrying out layered color mixing printing on plane color content by using an FDM printer based on a multilayer color reverse solution algorithm, and belongs to the technical field of 3D printing, and the method comprises the following steps: step 1, carrying out vectorization conversion on color information of an input image to obtain a preprocessed image with a clear contour and pure color; and 2, building a multilayer color reverse solving system based on an improved Kubelka-Munk model, reversely and accurately calculating color values of all layers, and ensuring that the color of each layer strictly conforms to the actual color generation capability range of the consumable. And step 3, carrying out layer-by-layer printing on the layering result according to a specific thickness and sequence, and finally presenting the original picture color on the contact surface of the printed piece and the hot plate. The method has the advantages that patterns with richer colors can be presented on the surface layer of a printed piece, and the limitation that the color of a printing material is limited in presentation in FDM multi-color printing is improved; meanwhile, under the condition that the printing process and hardware iteration cost are not increased, richer color selection is achieved.

Description

(19) State Intellectual Property Office (12) Invention Patent Application (10) Application Publication Number (43) Application Publication Date (21) Application Number 202511165449.8 (22) Application Date 2025.08.20 (71) Applicant Jin Yu Address 3304, Building 5, Phase I, Greenland, Huashan District, Ma'anshan City, Anhui Province 243000 (72) Inventor Jin Yu Liao Xin (51) Int.Cl. B29C 64 / 118 (2017.01) B29C 64 / 386 (2017.01) B33Y 10 / 00 (2015.01) B33Y 50 / 00 (2015.01) (54) Invention Title: A Method for Layered Color Printing of Planar Color Content Using an FDM Printer Based on a Multi-Layer Color Inverse Solving Algorithm (57) Abstract: This invention discloses a method for layered color printing of planar color content using an FDM printer based on a multi-layer color inverse solving algorithm, belonging to the field of 3D printing technology, including the following steps: Step 1: Vectorize the color information of the input image to obtain a preprocessed image with clear outlines and pure colors. Step 2: Build a multi-layer color inverse solving system based on the improved Kubelka-Munk model, and accurately calculate the color values ​​of each layer in reverse, ensuring that the color of each layer strictly conforms to the actual color rendering capability range of the consumables. Step 3: Print the layered results layer by layer according to a specific thickness and order, and finally present the original image colors on the contact surface between the printed part and the hot plate. The advantages of this invention are that it can present richer patterns on the surface of the printed part, improving the limitations of FDM multi-color printing due to the color limitations of the printing material; at the same time, it achieves richer color selection without increasing the printing process and hardware iteration costs. Claims 1 page, Description 2 pages, Drawings 1 page, CN 121043402 A 2025.12.02 CN 1 21 04 34 02 A 1. A layered color mixing printing method for printing planar color content using an FDM printer, characterized by comprising the following steps: Step 1: Preliminary preprocessing of the color information of the planar content to remove noise and unclear outline features; Step 2: Using a multi-layer color inverse solution system based on an improved Kubelka-Munk model, the color values ​​of each layer (Layer 1, Layer 2, Layer 3, Layer 4) are calculated in reverse and accurately according to the target printing color effect and the optical characteristics data of the consumables, ensuring that the color of each layer strictly conforms to the actual color rendering capability range of the consumables; Step 3: The layered results are printed layer by layer according to a specific thickness and order, and the final effect is presented on the contact surface between the printed part and the hot plate. 2. The layered color mixing printing method for using an FDM multi-color printer according to claim 1, characterized in that,In step one, the target color content is vectorized and eliminated by path fitting to remove discrete noise and blurred edges; the purified vector graphics are then rasterized back into bitmaps. 3. According to claim 1, a layered color mixing printing method using an FDM multicolor printer is characterized in that the color layering of the image in step two is obtained by inverse solving of an improved Kubelka-Munk model. 4. According to claim 1, a layered color mixing printing method using an FDM multicolor printer is characterized in that the layer-by-layer printing in step three sets the layer height to 0.1mm, and the layer sequence is optimized by placing dark layers and high-viscosity layers at the bottom and light layers and low-viscosity layers at the top. Claims 1 / 1 page 2 CN 121043402 A A method for layered color mixing printing of planar color content using an FDM printer based on a multi-layer color inverse solving algorithm Technical Field

[0001] This invention belongs to the field of 3D printing technology, specifically, it relates to a layered color mixing printing method using an FDM multicolor printer. Background Technology

[0002] In recent years, 3D printing technology has been widely used in manufacturing, medical, and art and cultural creation fields. FDM fused deposition modeling technology is one of the important development directions. The principle of FDM printing is to feed thermoplastic filament material to the nozzle through a filament feeding mechanism. The heated nozzle moves along the cross-sectional contour plane of the printed product and fills the trajectory under the control of a computer. At the same time, the heated hot melt consumable is extruded and coated on the worktable. After one layer of cross-section is formed, the next layer is fused and coated. In this way, the cross-sectional contour is printed layer by layer, and finally a three-dimensional product part is formed.

[0003] The existing FDM multi-color printing technology is directly limited by the color of the consumable during multi-color printing. At the same time, color bleeding or abrupt color transition also affects the final color performance. Other multi-color printing technology solutions, such as inkjet coloring after printing, still have high equipment costs at this stage.

[0004] In order to solve the above problems, this application proposes a layered color mixing printing method for 3D printing.

[0005] In view of the problems in the related technologies, the present invention proposes a layered color mixing printing method using an FDM printer to overcome the above-mentioned technical problems existing in the existing related technologies when printing color planar content.

[0006] In order to achieve the above objective, the present invention adopts the following technical solution:

[0007] A layered color mixing printing method using an FDM printer, comprising the following steps:

[0008] Step 1: Preprocessing the color information of the input image to generate a preprocessed image with clear outlines and pure colors.

[0009] Step 2: Using a multi-layered color inverse solution system based on the improved Kubelka-Munk model, according to...The target printing color effect and optical characteristic data of the consumables are used to reverse calculate the color values ​​of each layer (Layer 1, Layer 2, Layer 3, Layer 4) to ensure that the color of each layer strictly conforms to the actual color rendering capability range of the consumables.

[0010] Step 3: Print the layered results layer by layer according to a specific thickness and order;

[0011] Preferably, in Step 1, the target color content is vectorized and path fitting is used to eliminate discrete noise and blurred edges; the purified vector graphics are rasterized back into bitmaps to generate a preprocessed image with clear outlines and pure colors.

[0012] Preferably, in Step 2, the color change magnitude of the image within a single sample layer is graded by computer using color skipping, and the color combination with the largest spectral feature difference is selected to ensure uniform distribution in the CIE LAB space.

[0013] Furthermore, the image processing speed of the reverse solution is optimized by pre-computation acceleration, multi-core parallel processing, and GPU parallel computing, and real-time operation is achieved using the GPU through shader language.

[0014] Preferably, in step three, the layer sequence is optimized based on the physical characteristics of the consumables' color and optical transparency, covering a higher color gamut to achieve a better color rendering effect. Specification 1 / 2 page 3 CN 121043402 A

[0015] In summary, the technical effects and advantages of the present invention are:

[0016] 1. By utilizing the physical characteristics of the consumables and calculating color separation control for overlay printing, the tendency of color mixing and overlay in FDM printing is transformed into a characteristic and utilized.

[0017] 2. Under the condition that the colors of the FDM printer's printing consumables are fixed and the quantity is limited, a richer and more vivid color expression is presented.

[0018] 3. Without the need for complex printing equipment and process iterations, and at a lower cost, richer color selection is achieved through algorithmic adjustments.

[0019] Figure 1 is a diagram showing the effect of each layer after color separation of the image to be printed according to the present invention;

[0020] Figure 2 is a diagram showing the actual color gamut of the printing effect of the present invention; Detailed Description

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0022] A layered color mixing printing method using an FDM printer to print a wider color gamut includes the following steps:

[0023] Step 1: Perform preliminary preprocessing on the color information of the original image to remove noise and unclear outline features, and obtain a preprocessed image with clear outlines and pure colors;

[0024] The preprocessing of the image adopts a vectorization method to remove possible interference in the color layering process, and regenerates the bitmap for export after preprocessing.

[0025] Step 2: Using an algorithm built on a multi-layer color inverse solution system based on the improved Kubelka-Munk model, the colors of the content to be printed are layered as Layer 1, Layer 2, Layer 3, and Layer 4;

[0026] Referring to Figure 1, the layering scheme combines the color configuration of the standard 3D printing resin consumables provided by CMYK and RGBW. The color solution and superposition scheme are based on the color transmission properties of the printing material.

[0027] Step 3: The color information of the layered image is converted into a model, merged, and then arranged and printed layer by layer according to the order provided by the algorithm;

[0028] Referring to Figure 1, the printing order is generated based on the image model, strictly following the layering result of the algorithm. The thickness parameter is also solved inversely based on the algorithm.

[0029] Referring to Figure 2, the individually printed layers are stacked in order and printed as a whole, presenting a color gamut breadth and color richness that are difficult to represent by existing FDM multi-head printing technology.

[0030] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included within the protection scope of the present invention. Instruction Manual 2 / 2 Page 4 CN 121043402 A Figure 1 Figure 2 Instruction Manual Appendix 1 / 1 Page 5 CN 121043402 A 1 A Method for Layered Color Printing of Planar Content Using an FDM Printer Based on a Multi-Layer Color Inverse Solving Algorithm Abstract This invention discloses a method for layered color printing of planar content using an FDM printer based on a multi-layer color inverse solving algorithm, belonging to the field of 3D printing technology, including the following steps: Step 1: Vectorize the color information of the input image to obtain a preprocessed image with clear outlines and pure colors; Step 2: Build a multi-layer color inverse solving system based on the improved Kubelka-Munk model, and accurately calculate the color values ​​of each layer in reverse, ensuring that the color of each layer strictly conforms to the actual color rendering capability range of the consumables; Step 3: Print the layered results layer by layer according to a specific thickness and order, and finally present the original image colors on the contact surface between the printed part and the hot plate. The advantages of this invention are that it can present richer colored patterns on the surface of printed parts, improving the limitations of FDM multicolor printing due to the color limitations of printing materials; at the same time, it achieves a wider range of color choices without increasing printing process or hardware iteration costs. Method for printing planar color content by layered color mixing with an FDM printer based on a multilayer color inverse solvingalgorithm ABSTRACT The invention discloses a method for printing planar color content by layered color mixing with an FDM printer based on a multilayer color inverse solving algorithm, which belongs to the technical field of 3D printing and includes the following steps: Step 1: Perform vectorization conversion on color information of an input image to obtain a preprocessed image with clear contours and pure colors; Step 2: Establish a multilayer color inverse solving system based on the improved Kubelka-Munk model, accurately calculate the color value of each layer in an inverse manner, and ensure that the color of each layer strictly conforms to the actual color rendering capability range of the printing consumables; Step 3: Print the layered results layer by layer according to the specified thickness and sequence, and finally restore the original image colors on the contact surface between the printed part and the hot bed. The invention can present patterns with richer colors on thesurface layer of printed parts, and overcomes the presentation limitation caused by the color constraint of printing materials in FDM multi-color printing. Meanwhile, more optional colors are realized without increasing the cost of printing processes and hardware upgrading.

Claims

1. A method for layered color mixing printing of planar color content using an FDM printer, characterized in that, Includes the following steps: Step 1: Perform preliminary preprocessing on the color information of the graphic content to remove unwanted colors and unclear outline features; Step 2: Using the multi-layer color inverse solution system based on the improved Kubelka-Munk model, the color values ​​of each layer (Layer1, Layer2, Layer3, Layer4) are accurately calculated in reverse according to the target printing color effect and the optical characteristics data of the consumables, ensuring that the color of each layer strictly conforms to the actual color rendering capability range of the consumables. Step 3: Print the layered results layer by layer according to a specific thickness and order. The final effect is presented on the contact surface between the printed part and the hot plate.

2. The layered color mixing printing method using an FDM multicolor printer according to claim 1, characterized in that, In step one, the target color content is converted into a vector, and discrete noise and blurred edges are eliminated by path fitting; the purified vector graphics are then rasterized back into a bitmap.

3. A method for layered color mixing printing using an FDM multicolor printer according to claim 1, characterized in that, The color layering of the image in step two was achieved by inversely solving the improved Kubelka-Munk model.

4. A layered color mixing printing method using an FDM multicolor printer according to claim 1, characterized in that, In step three, the layer-by-layer printing is set with a layer height of 0.1mm, and the layer sequence is optimized by placing dark and high-viscosity layers at the bottom and light and low-viscosity layers at the top.

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