Three-dimensional visible physical watermark copyright anti-counterfeit marking method for 3D printed model

A 3D printing and anti-counterfeiting marking technology, which is applied in image data processing, equipment, business, etc., can solve the problems that traditional watermarks cannot continue to function and lose effectiveness, and achieve the effects of low deformation, avoiding modification, and good integration

Inactive Publication Date: 2018-11-16
ZHEJIANG UNIV OF FINANCE & ECONOMICS
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AI Technical Summary

Problems solved by technology

The traditional watermarking algorithm is oriented to the protection of digital models and can only be recognized in the digital state. When the digital model gener

Method used

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  • Three-dimensional visible physical watermark copyright anti-counterfeit marking method for 3D printed model
  • Three-dimensional visible physical watermark copyright anti-counterfeit marking method for 3D printed model
  • Three-dimensional visible physical watermark copyright anti-counterfeit marking method for 3D printed model

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[0056] The present invention will be further described below with reference to the drawings and examples.

[0057] Such as Figure 1-4 As shown, the 3D entity watermark copyright anti-counterfeiting identification method for 3D printing models includes:

[0058] Step 1: Calculate the saliency of the 3D network model, and extract the non-saliency area as the watermark editing target area.

[0059] Step 1.1 For the input three-dimensional mesh model, calculate the average curvature C(p) of each vertex in the vertex set with a distance σ from the vertex p.

[0060] Step 1.2 Calculate the Gaussian weighted average curvature G(C(p),σ) of each vertex:

[0061]

[0062] Let the set of vertices of σ distance from vertex p be N(p,σ)={x|||x-p|| <σ},

[0063] x is the vertex on the mesh model, σ is fine-grained, and 2σ is coarse-grained.

[0064] Step 1.3 Calculate the Gaussian weighted average curvature difference S(p) of each vertex with different granularities:

[0065] S(p)=|G(C(p),σ)-G(C(p),2σ)|...

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Abstract

The invention discloses a three-dimensional visible physical watermark copyright anti-counterfeit marking method for a 3D printed model. The method comprises firstly calculating the saliency value ofthe model and extracting a non-saliency region as an editing region of a visible watermark; then performing planar parameterization on the 3D model to obtain a 3D-to-2D mapping relationship and calculating the normal map of the model; selecting watermark image information to be edited and locating the watermark image information to be edited in the non-saliency region of the normal map; solving anew normal vector according to the embedding strength of the watermark, and performing a surface reconstruction algorithm based on a kernel function to map a 2D watermark image to the surface of the 3D model; and finally adding a visible physical watermark to the surface of the 3D printed model. The method can automatically select a low-detail region for surface editing, effectively avoids the modification of the visible watermark to important features of the model, provides a reconstructed curved surface with low deformation degree by using the surface reconstruction algorithm based on the kernel function, and can fuse with the grids of a non-editing region.

Description

technical field [0001] The invention relates to a three-dimensional visible entity watermark copyright anti-counterfeiting identification method for 3D printing models. Background technique [0002] 3D printing is a rapid prototyping technology that has been widely used in many fields such as film and television, aerospace, biomedicine, and industrial design. This technology is not only a major technological revolution, but also a subversion of traditional manufacturing. With the rapid development and commercialization of the current 3D rapid prototyping technology, a large number of digital models are materialized through 3D printing and other technologies and put into commercial applications, which also brings the demand for model management and copyright protection. The traditional watermarking algorithm is oriented to the protection of digital models and can only be recognized in the digital state. When the digital model generates real objects through 3D printing techno...

Claims

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Application Information

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IPC IPC(8): G06T1/00G06Q30/00
CPCG06Q30/0185G06T1/0021
Inventor 冯小青王继林董克明李黎
Owner ZHEJIANG UNIV OF FINANCE & ECONOMICS
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