【作者】 任石；

【导师】 秦茂玲； 刘弘；

【作者基本信息】 山东师范大学 ， 计算机软件与理论， 2007， 硕士

【摘要】 在非真实感绘制领域中,艺术风格的生成与转换一直是一个研究热点。艺术图案(线条画)被广泛的应用于科技文献插图、工业图案设计以及平面广告设计等领域,因此,风格的重用和转换技术尤为重要,它是提高图案设计质量和效率的关键因素,也是制约企业发展的重要因素。迄今为止,人们已经提出了多种风格转换算法,但是这些算法在理论和方法上仍不完善,因此对艺术风格转换方法的进一步研究,不仅有助于算法理论的完善,更有助于方法的推广应用。同时,随着计算机网络技术的发展,各种形式的多媒体作品如音频、视频、动画、图像等都纷纷以网络的形式发布,这使得侵权者能够以低廉的成本复制和传播未经授权的数字图像,这也成为制约企业发展的重要因素。因此本文提出对风格转换后的线条画加水印进行版权保护。本文对线条画风格转换技术进行了较为系统的分析和研究,提出了一种基于区域的线条画风格转换方法。并在分析和总结了国内外二值图像数字水印算法的基础上,提出了一种基于DCT域的二值图像零水印方法。本文主要包括以下一些内容:(1)非真实感绘制的概述和线条画风格转换的基础知识。首先介绍了非真实感绘制的概念、产生背景及其相关研究。其次介绍了手绘线条画的特点,分析了早期计算机生成线条画的方法。(2)线条画风格转换的预备知识。本文把线条画的风格抽象为线条画的组成元素—笔划的风格,通过对笔划的形状和宽度的规范化表示,对线条画的风格转换方法进行了研究。并介绍了笔划的提取以及笔划的绘制和相似性比较的方法。(3)提出一种基于区域的线条画风格转换方法。基于样本的线条画风格转换方法可以较好的获得具有样本风格的目标图像,但是,它是把整幅样本图像作为一种风格来进行风格转换的,而有些线条画中却包含有多种风格的线条,不同风格的线条可以给人不同的感觉。本文在分析了以上情况的基础上,提出了一种改进的线条画风格转换方法-基于区域的线条画风格转换的方法,试验证明该方法可以更加灵活的实现线条画的风格转换。(4)提出一种基于DCT域的二值图像零水印方法。首先介绍了二值图像的特点,并总结了国内外二值图像水印算法,最后根据对一个图像进行各种几何变换时,图像全局DCT系数(中低频)符号基本保持不变的特性,提出了一种提出一种基于DCT域的二值图像零水印方法。仿真试验证明,该方法具有较好的抗几何攻击能力,鲁棒性好,具有较好的实用价值。更多还原

【Abstract】 Style learning and transformation have been a hotspot in NPR area. Art designs (line drawings)are widely used in scientific literature illustrations, graphic design industrial design and plane design, etc. So that, style re-using and transformation have been especially important. On the side of patterns design and marking, some enterprises such as printing, dyeing and ceramics, advertisement, cartoon marking, etc, behave poorly in innovation and manufacturing because of difficulty in re-using and adjusting the style. Up to now, researchers have studied and found many effective algorithms for style translation, however, these algorithms are still not perfect in theory. Therefore, the further research on methods of artistic styles not only conducive the improvement of algorithm theory but also help promote the method of application.With the development of computer network technology, all kinds of multimedia works such as audio, video, animation, images and so on have released in the form of the network. Violators can copy and disseminate the unauthorized digital images at the lower cost. This has also become an important factor restricting the development of enterprises. So the line drawing on the way for copyright protection was proposed.This paper is focused on technologies for a more systematic analysis and research, and a method of style translation for line drawings based on example regional lines was presented. Based on the analysis and conclusion of the digital watermarking algorithm for binary image, an adaptive binary image watermark algorithm based on the combination of space and frequency domain was proposed. Include the following elements:(1) NPR overview and line drawings translation on the basis of knowledge. First the concept of non-photorealistic rending, the background and related research are introduced. Second, the paper introduces the line-drawings features, analyzes the line drawings method which computer generated, and also proposes a brief overview of the style translation methods.(2) Prior knowledge of style translation for line drawings. The style of a line drawing is abstracted as the styles of its elements: strokes, which are the trace of the artists’pen. With standard representation of the strokes’shape and width, the methods of style translation for line drawings are discussed. And the extraction of strokes, drawing of strokes and the methods for similar comparison are also introduced in this paper.(3) Style translation for line drawings based on example regions. The method of style translation for line drawings based on example can be used to obtain the image with the target image style, and it seems example as a whole style. However, some line drawings have included a variety of styles of line, and different styles of lines can give the different impression. On the basis of the above, an improved method of style translation for line drawing is proposed. The experiments showed that this method could be more flexible in the style translation for line drawing.(4) A binary image zero-watermark algorithm based on the DCT domain. First this paper introduces the characteristics of the binary image and summarizes the binary image watermark algorithm. Finally, a binary image non-watermarking algorithm based on the DCT domain is proposed, because the DCT coefficient (low frequency) sign basically unchanged, when images receive a variety of geometric attack. Simulation shows that the method has the better anti-geometric attack capability, robust, and has good practical value.更多还原