Pivotal Technical Research Of Paper Lacuna Inspection Based On DSP

The surface quality inspection for paper is a most important way for paper corporations to improve their products' quality and thereby enhance their competition capability. The on-line inspection for the surface defect of paper strips using techniques of computer-vision and image-process need to do fleet operation for a great deal of image data being collected. Just with this capability, the system is able to finish collecting quality information of paper strip surface within an accepted time range. Digital image process has become the key point of realization of system real-timeness.In recent years, the development of DSP technology has put the theory achievement of digital signal processing field into practical application systems and pushed the progress of new theory and application. At the same time, it plays an important role in the field of image processing. The DSP-based image processing system can be applicable in many kinds of practical fields.The dissertation is based on our lab's research production in the field of the surface defect inspection system of paper. During the analysis of the structure of traditional image processing system and inspection process, the dissertation find the choke point of the system real-timeness, and bring forward the design of surface defect inspection system based on PC host, image-collected card and DSP. The design of new system is carried out both in hardware and in software. In hardware, the traditional system is improved by adding DAM642 whose chip is TMS320C642 of TI. This image process equipment is used to do the part which impacts system real-timeness seriously. In software, principal-and-subordinate software structure is brought. The code running both in DSP and in host is written to do the Cache and EDMA defect inspection. During programming, several new techniques such as on-line emulation and optimization are used to increase the efficiency of system. The final aim of this research is to accomplish on-line surface inspection system for paper strips which is able to fill the supply of industrial manufacture.The research finally accomplishes primary design of on-line surface inspection system for paper strips. After several tests, the real-timeness and precision of the system has improved obviously, and can satisfy the demand of real production.At the end of the dissertation, amelioration and expectation for inspection system development based on DSP are mentioned.