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

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...

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 generates real objects through 3D printing technology, the traditional watermark hidden in the digital model will no longer be able to function and lose its effectiveness

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