The Design Of The Vision System Based On DSP

Computer vision, which is a comprehensive study of many subjects, has being applied in nearly all of domains that need human vision, such as science & technology, national defense, aviation & space navigation, medicine & therapies as well, along with the development of digital image technology and the computer technology. The industrial vision system has been developed greatly because of two reasons. The first one is that the image processing technology is getting more perfect and more reliable and its cost reduces greatly. The second one is that the high automation of industry needs new detecting method, which is more effective, more accurate and can work at higher speed. The vision system based on DSP (Digital Signal Processor) has many merits, such as short design cycle, quickly designing and verifying of product prototype, rapid applications of new algorithm, new standard and new protocol and it is easy to be upgraded by only renewing its software. This thesis designs a visual system based on DSP, for the requirement of automatic visual fabric-defect detecting and the visual fabric-printing motor servo in the textile industry. This system uses high-precision line-scan digital camera (2048 pixels per line) as image-grabbing equipment, and general DSP, which is programmable, of great stability and highly integrated with many extended I/O interfaces, so that the system can satisfy the requirement of high pixel resolution and high image-processing speed for industrial applications,as well as it is convenient to be used for different industrial applications. The integral structure of this vision system is designed basing on the analysis with the DSP and line-scan cameral used in the system, including their working principles and characteristics. The keystone of the system is the image-processing card, which realizes the main functions of the system. The design of the card including both of its hardware and software is discussed detailedly in this thesis. The application of the vision system in fabric-defect detecting and visual fabric-printing motor servo control is briefly discussed too. Finally, some advices are put forward for the hardware upgrading and algorithm realization to improve the system.