Study on Digital Design Methods for Leather Texture on Plastic Parts

皮革纹理化是塑料件表面装饰技术之一。这种制造工艺一直依赖于使用化学蚀刻在模具表面上雕刻纹理的手工工作。它阻碍了审美装饰的产生。最近，数控铣床使用皮革纹理的数字3D数据。提出了一种利用X射线CT扫描系统（XCT）对真实的皮革样品进行扫描，生成纹理数据的方法。我们开发了一种方法来提高扫描精度的XCT，也是一种方法来扩展扫描的纹理数据的一个有限的区域到任意较大的区域所需的覆盖一个零件表面进行装饰。对于前一个问题，我们发现伪影是准确性的关键因素，并通过我们的新校正方法减少。对于后者，我们扩展了一种纹理合成方法，使其最适合皮革纹理。将皮革纹理数据应用于真实的制造，以生产塑料制成的移动的手机外壳。

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.