| 英文摘要 | As 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... |
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