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开放式数字印刷控制系统中的关键技术研究
Alternative TitleResearch on Key Technologies of Open Digital Printing Control System
胡建华
Subtype工学博士
Thesis Advisor王云宽
2014-05-29
Degree Grantor中国科学院大学
Place of Conferral中国科学院自动化研究所
Degree Discipline控制理论与控制工程
Keyword开放式大幅面多通道数字印刷控制系统 阈值噪声调制 误差扩散 高实时性数字印刷传输协议 Large Format Multi-channel Open Digital Printing Control System Threshold Noise Modulation Error Diffusion High Real-time Performance Digital Printing Transmission Protocol
Abstract数字印刷是印刷术与数字化技术相结合的产物。相对于传统印刷技术,数字印刷技术具有无需制版、无接触、印刷内容灵活可变、绿色环保等优势,因而在个性化印刷、可变数据印刷、按需出版等行业突显出巨大的发展潜力。目前大幅面数字印刷控制技术主要被富士施乐、惠普、柯达等国际印刷巨头垄断,造成国内数字印刷行业成本高、效益低。因此,研究并开发具有自主知识产权的大幅面开放式数字印刷控制系统,打破国外技术垄断,对提高我国数字印刷技术水平和促进相关产业的发展具有重大意义。 本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”,围绕开放式数字印刷控制系统中大幅面多通道控制技术、高效数字半色调技术、高速高实时传输协议等关键技术进行了研究,完成的主要工作有: 1.针对国内数字印刷控制系统设计封闭,无法进行大幅面多通道印刷及无缝印刷等问题,提出了一种基于令牌的开放式多通道数字印刷控制结构,成功解决了上述技术难题。该结构将数字印刷控制系统抽象为应用层、分解层、生成层、非实时调度层、实时调度层、执行层6层结构,各层间的数据交换均通过令牌进行。借助于令牌机制的灵活性,该控制结构实现了数字印刷控制功能的解耦,使不同层次的控制任务分布至不同的控制单元进行,有效提高了控制系统性能,从而大幅提高了印刷宽度。此外,该结构借助于FPGA技术的高度并行性以及令牌技术,每个喷头都可以作为独立通道进行控制,进而实现了高速无缝印刷。 2.针对常规误差扩散半色调算法输出结果中存在的Idle-Tone现象以及频谱不对称性的问题,提出了一种基于遗传算法优化的阈值噪声频率调制误差扩散半色调算法(Threshold Noise Frequency Modulation Error Diffusion, TNFMED),该算法有效减弱了输出结果中的Idle-Tone现象,改善了频谱的对称性,提高了视觉效果。在误差扩散过程中,TNFMED根据图像中的局部灰度信息添加特定概率的调制噪声,使误差扩散引入了更多的随机性,从而有效减弱了Idle-Tone现象。为了改善输出频谱的对称性,TNFMED采用可变式误差滤波器设计,针对不同的局部灰度选取不同的最优误差滤波器。由于最优滤波器的获取采用了基于两段式径向平均功率谱密度(Radially Averaged Power Spectral Density, RAPSD)的遗传算法离线进行,因此TNFMED在保留了基本误差扩散法高效性的同时,有效改善了输出频谱的对称性。实验证明,TNFMED可以有效改善输出图像的频谱结构、减弱Idle-Tone现象,从而获得良好的视觉感受。 3.针对数字印刷控制系统中数据通信的高并发性、高实时性、高速性、高可靠性要求,研究制定了数字印刷专用传输协议(Printhead Serial Transmission Protocol,PSTP)。首先,在物理层,提出了一种基于8B/10B冗余编码的优先级可抢占式同步传输技术。高优先级消息可以随时中断低优先级消息抢先传输,传输完毕后自动恢复低优先级消息传输,最大限度保证了数据传输的高速性和实时性;然后,在链路层,针对数字印刷控制系统实时性要求高于数据可靠性要求的特点,提出采用RS(80,64)交织缩短码进行链路层前向纠错。相对于常规的校...
Other AbstractAs a combination of printing technology and digital technology, digital printing has the advantages of being free of printing-plates, contactless with printing medium, easy for each impression modification, and environment friendly over the traditional offset printing, and it has demonstrated its huge potential in various applications such as personalized printing, variable data printing, and printing on demand etc. Currently the key technologies of large format controlling system for digital printing are monopolized by a few foreign printing companies such as Xerox, HP, Kodak, etc. and consequently digital printing companies in China are in a very disadvantageous situation of high cost but low profit. Hence developing our own large format open digital printing control systems is of great significance to break up the foreign monopoly and to advance our national printing industries. This dissertation is initiated and supported by the joint project “Design of wide format ceramic digital printing control system” by our institute with a large Chinese printing company, and the resulting systems have been successfully transferred and used in the company. The dissertation is concentrated on research and development of some key technologies in open digital printing control system, including large format multi-channel printing control technology, high efficient digital halftoning technology, high speed and high real-time performance transmission protocol technology etc. The dissertation is rather application-oriented research, the main contributions include: 1.A token based multi-channel open digital printing control architecture is proposed. This architecture has the advantages of large format printing, multi-channel printing and seamless printing over the traditional digital printing control architecture. In this architecture, the whole digital printing control system is divided into six layers: application layer, decomposition layer, generation layer, non-real time dispatching layer, real-time dispatching layer, execution layer and the communication between layers is based on tokens. Due to the flexibility of the token, the control task is distributed to several control units, so the performance of the control system is enhanced effectively and the printing format is significantly enlarged. In addition, due to the high parallelism of FPGA and token technology, each printhead is controlled individually, so the control channels can be separated and s...
shelfnumXWLW1992
Other Identifier201118014628007
Language中文
Document Type学位论文
Identifierhttp://ir.ia.ac.cn/handle/173211/6638
Collection毕业生_博士学位论文
Recommended Citation
GB/T 7714
胡建华. 开放式数字印刷控制系统中的关键技术研究[D]. 中国科学院自动化研究所. 中国科学院大学,2014.
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