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3D打印模型版权保护技术研究进展

冯小青1, 李黎2, 王继林1, 董克明1, 刘亚楠1, 严素蓉3(1.浙江财经大学信息管理与工程学院, 杭州 310018;2.杭州电子科技大学计算机学院, 杭州 310018;3.浙江财经大学东方学院, 海宁 314408)

摘 要
目的 近年来3D打印模型的版权标注和保护引起了研究者的关注,为了全面反映3D打印模型版权保护研究的现状和最新进展,本文对国内外公开发表的主要文献进行了梳理和分析。方法 首先在广泛文献调研的基础上,描述3D打印模型文件和3D打印模型攻击类型,分析3D打印和扫描过程对模型的影响。然后对3D打印模型的版权保护策略进行分类,详细阐述每类方法的基本框架和相关技术特征。最后根据相关文献,将3D打印数字水印方法与传统网格水印算法和抗3D打印—扫描攻击的性能进行比较。结果 基于物理特性的3D模型版权保护技术能对3D打印后的模型嵌入有效的具有一定隐蔽性的版权标识,但在提取微结构体等信息时需要借助一些专用设备,不具有普适性。基于数字水印的方法既能抵抗传统的数字模态下的相似性变换、剪切、噪声、细分、量化、光顺等攻击,又能有效抵抗3D模型的数/模等模态转换攻击,并且高精度的3D打印机和扫描仪能有效提高水印的检测率。结论 3D打印产品是设计者和生产企业的智慧和心血的结晶,包含知识产权。随着3D打印在工业领域的广泛应用,3D打印模型版权保护有着广阔的应用前景和研究价值,但目前针对3D打印模型的版权保护的检测和评估机制存在一些局限性,未来需要构建统一的3D打印模型测试库和3D打印模型水印评测体系。
关键词
Research progress on copyright protection technology of 3D printing model

Feng Xiaoqing1, Li Li2, Wang Jilin1, Dong Keming1, Liu Yanan1, Yan Surong3(1.School of Information and Engineering, Zhejiang University of Finance and Economics, Hangzhou 310018, China;2.School of Computer, Hangzhou Dianzi University, Hangzhou 310018, China;3.School of Dongfang, Zhejiang University of Finance and Economics, Haining 314408, China)

Abstract
Objective With the rapid evolution of 3D printing and scanning technologies, products on the traditional manufacturing line can be easily and rapidly copied. Copyright issues have become an unavoidable and increasingly prominent problem in the 3D printing era. Users can rapidly and easily copy and produce 3D models through 3D printing-scanning technologies. The copyright protection problems become increasingly serious. The manner by which to protect the copyright of 3D printing models effectively obtained great attention from numerous researchers in recent years. Copyright protection methods for 3D printing models have been proposed. However, the effectiveness and detection rate of the algorithms must still be further improved. This work focuses on the main literature published worldwide for comprehensive analysis to reflect the research status and latest development of the copyright protection of 3D printing models fully. Method The 3D printing model file is represented in detail in accordance with the basic framework of copyright protection of 3D printing model on the basis of extensive literature research. The attack type of the 3D printing model is elaborated. Furthermore, the influence of 3D printing and scanning process on the model is analyzed. Then, the related technologies are classified in accordance with the technical characteristics of the copyright protection strategy of 3D printing model. The basic framework of each type of method and related technical features are described. Finally, the performance analysis of 3D printing model digital watermarking is conducted in accordance with related references. Such analysis is mainly discussed from two aspects, mainly from the performance comparison of traditional grid watermarking algorithm and that of 3D printing-scanning attack. Result The 3D product model exhibits digital and solid models. The 3D printing refers to the process of converting a digital model to a physical one. A physical model is transformed to a digital scanning model during scanning. These processes involve multiple uneven sampling and quantization and are highly complicated processes. The existing 3D model digital watermarking algorithm mainly focuses on the copyright protection of a single digital modal model and ignores the copyright protection of the product model under the physical mode. The 3D printing characteristics (i.e., print resolution, layer thickness and smoothness, and step layering effect) and geometric distortion caused by 3D scanning are neglected. Therefore, the traditional 3D mesh model watermarking strategy cannot be directly applied to the 3D printing model. The related technology is divided into two categories, namely, physical characteristic method and digital watermark, in accordance with the technical characteristics of the 3D printing model copyright protection strategy. The copyright protection technology based on the physical characteristics can embed effective copyrighted logos for 3D printed models. However, this type of technology requires special equipment when extracting micro-structure information and exhibits no universality. Methods based on the digital watermarking can effectively resist not only the attacks of similarity transformation, cutting, noise, subdivision, quantization, and smoothing in the traditional digital domain but also the modal transition attack of the 3D model. The high-precision of 3D printers and scanners can effectively improve the detection rate of watermarks. Conclusion 3D printing products are the crystallization of wisdom and hard work of manufacturers and designers and contain huge intellectual property rights. With the extensive penetration of 3D printing into the industrial field, the copyright protection of 3D printing models possesses potential application and research value. However, limitations are observed in the detection and evaluation mechanism of the copyright protection of the current 3D printing model. Therefore, further research is needed. A unified 3D printing model test library and 3D printing model watermark evaluation system should be developed.
Keywords

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