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大型数字印刷控制系统中关键技术的研究
王欣波
学位类型工学博士
导师王云宽
2016
学位授予单位中国科学院研究生院
学位授予地点北京
关键词大型数字印刷控制系统 数字半色调 误差扩散 循环供墨 参数整定
摘要近年来,随着印刷技术的发展,新工艺方法的出现以及计算机技术的不断成熟,加上消费者对印刷产品个性化、及时化的要求,印刷领域发生了革命性的变化,从传统印刷走向了数字化印刷。数字印刷作为当今印刷技术发展的一个焦点,在我国主要用于商业,在工业中的应用相对落后。当今先进的数字喷墨印刷控制技术主要被富士施乐、惠普、柯尼卡美能达、理光等国际印刷企业垄断,严重制约我国工业印刷行业的发展。因此,研究并开发具有自主知识产权的大型数字印刷控制系统,对于打破国外技术垄断,提高我国数字印刷技术水平以及促进相关产业的发展具有重大意义。
论文结合重大技术转让项目“大幅面数字瓷砖印刷控制系统设计”及相关后续项目,针对大型数字印刷控制系统中的系统设计方案、数字半色调技术以及循环供墨技术进行了深入地研究,完成的主要工作如下:
(1)针对目前国内工业用数字印刷控制系统设计水平低下,无法进行大幅面多通道印刷,且印刷速度低下等问题,提出了一种具有自主知识产权的大型数字印刷控制系统构架,该构架主要由喷头阵列、核心印刷驱动系统以及循环供墨系统组成。印刷驱动系统采用可拓展式的系统构架,结合基于实时与非实时相结合的印刷调度控制算法,设计灵活,可拓展性好,能够实现大幅面多通道的快速印刷,在国内同行业具有领先水平。循环供墨系统具有双重循环结构,主循环用来产生喷头所需的负压以及保证墨量的供给,副循环在消除杂质的同时,保证墨水的均匀性,从而为印刷质量提供保障。
(2)为解决以往误差扩散算法中存在的非期望人工结构以及细节表现能力不足等缺点,构建了一种基于纹理结构与噪声调制相结合的阈值模型。根据局部视觉偏差,将图像分为平坦区、轻度纹理区和高度纹理区。根据纹理程度的不同,分别采用噪声调制和纹理反馈信息对阈值模型进行修正,在避免误差扩散算法中存在的人工结构的同时,保证细节纹理的清晰再现。
(3)针对误差扩散算法中误差过滤器的设计问题,提出一种基于蚁群算法的色调感知误差过滤器参数设计方法。结合蓝噪声的频谱特性以及图像的空间视觉特性,定义半色调输出图像的评价指标,采用蚁群算法离线完成了基于色调感知的误差过滤器的搜索,既保留了传统误差扩散算法的高效性,又保证了输出半色调图像的蓝噪声特性。
(4)为提高本文设计的循环供墨系统的通用性,提出一种自适应控制算法。首先采用加权递推最小二乘法对循环供墨系统进行辨识,建立离散数学模型,之后通过遗传算法对PID参数进行整定,为供墨系统在实际应用中的参数设计提供指导。
(5)基于以上技术,设计多套大型数字印刷控制系统,包括基于星光喷头的大幅面单Pass纺织印花机(200个喷头阵列)和基于京瓷喷头的多Pass宽幅扫描机。 目前,这些系统均在合作厂家得到稳定应用。
其他摘要In recent years, with the development of printing techniques, the appearance of new methods and the maturity of computer technology, coupled with the requirements of consumers for personalized and timely printing products, the field of printing has changed from traditional printing to digital printing revolutionarily. As a focal point of the development of printing technology, in China, the application of digital printing technology is mainly distributed in the business, while the application in industry is relatively backward. Moreover, advanced digital ink jet printing control technology is monopolized by the international printing enterprise like Fuji Xerox, HP, Konica Minolta, Ricoh, etc, which restricts the development of the printing industry in China. Thus, researching and developing of large scale digital printing control system with independent intellectual property rights is of great significance to break the monopoly of foreign technology and promote the development of related industries.
With the major technology transfer project "Design of large format ceramic digital printing control system” and related follow-up projects, this thesis is concentrated on the system design, digital halftoning technology and ink circulation technology. The main contributions can be summarized as follows:
(1) In order to solve the problems exist in large scale digital printing control system in our country, a framework of digital printing control system with independent intellectual property rights is proposed, which consists of Nozzle array, printing drive system and ink supply circulation system. A scalable system architecture is used in the printing drive system. With the combination of printing scheduling control algorithm based on real time and non real time, the printing drive system has the advantages of flexible design and good expansibility. It can realize the rapid printing with large area and multi channel. The ink supply system has the structure of double circulation. The main loop is used to generate the negative pressure required by the print head and to ensure the supply of ink. The slave circulation is used to eliminate impurities and to ensure the uniformity of ink.
(2) In order to solve the problem of the non expected artificial structure and the lack of detail performance in the error diffusion algorithm, a threshold model based on noise modulation and texture structure is proposed. According to local visual deviation, an image can be divided into flat area, light texture area and high texture area. The threshold model is modified by performing the noise modulation in flat area and by utilizing the texture information in textured area. Experiments shows that this threshold model can not only reduce the unexpected artifacts, but also ensure the details of the texture structure.
(3) An error filter model based on ant colony algorithm is proposed for the optimization of error filter in error diffusion algorithm. Firstly, with the consideration of the spectral characteristics of the blue noise and the spatial visual characteristics of the image, the evaluation index of a halftoning image is defined. Then, this thesis gets the adaptive error diffusion coefficients by using ant colony optimization. This error filter not only retains the efficiency of the traditional error diffusion algorithm, but also ensures the output of the blue noise characteristics of the half tone image.
(4) An adaptive control algorithm is proposed in order to make the ink supply circulation system be suitable for various occasions. Firstly, the model is established by using the weighted recursive least square method to identify the circulating ink supply system. Then the PID parameters are determined by genetic algorithm to guide the design of PID control.
(5) Two large scale digital printing control system are designed, including large scale single pass textile printing system based on Dimatix print head and multi pass wide scanning system based on Kyocera print head. At present, these two systems are applied in practice by our cooperative manufacturers.
文献类型学位论文
条目标识符http://ir.ia.ac.cn/handle/173211/14198
专题毕业生_博士学位论文
作者单位1,中国科学院自动化研究所
推荐引用方式
GB/T 7714
王欣波. 大型数字印刷控制系统中关键技术的研究[D]. 北京. 中国科学院研究生院,2016.
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