Study on Digital Design Methods for Leather Texture on Plastic Parts

皮革毛化是塑料件表面装饰技术之一。这种制造过程一直依赖于使用化学蚀刻在模具表面雕刻纹理的手工工作。它阻碍了审美装饰的产生。近年来，使用皮革纹理的数字3D数据的数控铣床得到了应用。在这项研究中，提出了一种利用X射线CT扫描系统(XCT)扫描真实皮革样品来生成纹理数据的方法。我们开发了一种提高XCT扫描精度的方法，并将有限区域的扫描纹理数据扩展到需要覆盖待装饰零件表面的任意较大区域。对于前一个问题，我们发现伪影是影响精度的关键因素，我们的新的校正方法减少了伪影。对于后者，我们扩展了一种纹理合成方法，使其对皮革纹理是最优的。皮革纹理数据被应用到一个真实的制造中，以生产塑料手机外壳。

Leather texturing is one of the surface decoration technologies for plastic parts. This manufacturing process has been dependent on manual work using chemical etching for graving textures on die surfaces. It hinders generation of aesthetic decoration. Recently NC milling machines are applied using digital 3D data of the leather textures. In this study methods for generating texture data by scanning real leather samples with an X-rays CT scanning system (XCT) was proposed. We developed a method to improve scanning accuracy of XCT and also a method to extend the scanned texture data of a limited area to arbitrary larger areas needed to cover a part surface to be decorated. For the former issue, we found artifact is critical factor for the accuracy and was reduced by our new correction method. For the latter we extended a texture synthesis method to be optimal for leather textures. Leather texture data was applied to a real manufacturing to produce cases of mobile phones made of plastic.