Shin Choonsung, Hong Sung-Hee, Jeong Hieyoung, Yoon Hyoseok, Koh Byoungsoo
Graduate School of Culture, Chonnam National University, Gwangju, Korea.
Hologram Research Center, Korea Electronics Technology Institute, Seoul, Korea.
Math Biosci Eng. 2022 Sep 26;19(12):14102-14115. doi: 10.3934/mbe.2022657.
This paper presents an all-in-one encoder/decoder approach for the nondestructive identification of three-dimensional (3D)-printed objects. The proposed method consists of three parts: 3D code insertion, terahertz (THz)-based detection, and code extraction. During code insertion, a relevant one-dimensional (1D) identification code is generated to identify the 3D-printed object. A 3D barcode corresponding to the identification barcode is then generated and inserted into a blank bottom area inside the object's stereolithography (STL) file. For this objective, it is necessary to find an appropriate area of the STL file and to merge the 3D barcode and the model within the STL file. Next the information generated inside the object is extracted by using THz waves that are transmitted and reflected by the output 3D object. Finally, the resulting THz signal from the target object is detected and analyzed to extract the identification information. We implemented and tested the proposed method using a 3D graphic environment and a THz time-domain spectroscopy system. The experimental results indicate that one-dimensional barcodes are useful for identifying 3D-printed objects because they are simple and practical to process. Furthermore, information efficiency can be increased by using an integral fast Fourier transform to identify any code located in areas deeper within the object. As 3D printing is used in various fields, the proposed method is expected to contribute to the acceleration of the distribution of 3D printing empowered by the integration of the internal code insertion and recognition process.
本文提出了一种用于三维（3D）打印物体无损识别的一体化编码器/解码器方法。所提出的方法由三部分组成：3D代码插入、基于太赫兹（THz）的检测和代码提取。在代码插入过程中，生成一个相关的一维（1D）识别码来识别3D打印物体。然后生成与识别条形码对应的3D条形码，并将其插入物体立体光刻（STL）文件内部的空白底部区域。为了实现这一目标，有必要找到STL文件的合适区域，并将3D条形码与STL文件中的模型合并。接下来，利用输出3D物体透射和反射的太赫兹波提取物体内部生成的信息。最后，对来自目标物体的太赫兹信号进行检测和分析，以提取识别信息。我们使用3D图形环境和太赫兹时域光谱系统对所提出的方法进行了实现和测试。实验结果表明，一维条形码对于识别3D打印物体很有用，因为它们处理起来简单实用。此外，通过使用积分快速傅里叶变换来识别位于物体更深区域的任何代码，可以提高信息效率。由于3D打印应用于各个领域，预计所提出的方法将有助于通过内部代码插入和识别过程的集成来加速3D打印的推广。
