【作者】 樊臻；

【导师】 蒋静坪；

【作者基本信息】 浙江大学 ， 控制理论与控制工程， 2008， 博士

【摘要】 本论文研究使用自定义色纱的彩色像景的计算机辅助设计技术。与一般手工像景设计相比,采用全自动计算机设计,并且不固定色纱颜色。特别是当色纱数上升时,有许多算法问题要解决。这些挑战包括域映射策略,有效色纱选择策略,及计算分色片的稳定算法。另外,高精度的像景织造,要求对使用半色调的多色纱生成的所有颜色建立准确的物理模型。在研究了这些问题后,本文提出了新的算法和物理模型,并且将它们结合在一起,实现了智能像景CAD系统。此系统能够从任意图像中自动选择优化的色纱,并且产生各个色纱的分色片,经过组织处理后,可提供给织机织造。使用这一技术,大大提高了像景设计效率,并且色彩的准确度、色纱的利用效率均得到了提高,织物的成本也得到了有效的控制。主要工作●提出并更改了颜色半色调模型,使之适应织物颜色表现。并且提供了从模型参数到实验数据相配合的步骤。●将两个优秀策略加以融合,提出了一个有效的参数化的域映射算法。●描述了如何改变随机组合优化算法(模拟退火和遗传算法),使之能有效地搜索到重现一个给定图像的最优色纱组合。●研究出了一个鲁棒的多分辨率的算法,能够在给定色纱组合的情况下,平滑计算输入图像的分色片。●最后,在编写CAD软件的过程中,应用设计模式,研究出了通用交互式CAD系统软件的体系结构。更多还原

【Abstract】 This dissertation investigates the general problem of reproducing color images on an offsetweaving press using custom yarns in any combination and number. Many mathematical and algorithmic challenges arise when printing with inks other than the standard process colors (cyan, magenta, yellow, and black), particularly as the number of inks increases.These challenges include the development of gamut mapping strategies, efficient yarn selections trategies. and robustmethods for computing color separations in situations that may be either overconstrained or underconstrained. In addition, the demands of high-quality color printing require an accurate physical model of the colors that result from overprinting multiple inks using halftoning, including the effects of dot gain, and the interreflection of light between ink layers. As we explore these issues, we present new algorithms and physical models that together comprise a system capable of choosing optimal inks for an image and generating the appropriate color separations. Finally. we present some printed examples demonstrating the promise of our techniques.●We modify existing models of weave layering and color halftoning.●We introduce a gamut mapping algorithm that is parameterized to effectively fill a gap between two predominant strategies in the literature.●We describe how stochastic combinatorial optimization methods (simulated annealing and genetic algorithms) can be modified to find the papers and inks well-suited to reproducing a given image.●We develop a robust multiresolution algorithm that, given any combination of inks, computes separations that are as smooth as the input image.●Finally, we develop a general interactive CAD structure using design pattern.更多还原