Photoelectric Banknote Image Processing Subsystems

Currency sorter is an advanced financial processing device integrated with optics, mechanics, electronics and magnetics. Its main function is to recognize the denomination and face direction of the bills and distinguish the newer bills from the older ones. Henceforth, currency sorter may satisfy the general operation on ATM such as drawing out bills and the selection of reusable bills automatically. With the high-speed development of the theory of pattern recognition in the last thirty years, the computer technology of bill's photoelectric image recognition which used on currency sorter to improve its recognition ratio, has appeared in succession in the last decade of 20 century. The early currency sorter which used the digital image recognition technology is restricted by capability of CPU. They have some shortages: poor calculation skills, complex mechanism, bulky machinery and so on. With the invention of high-performance DSPs, the goal that minimize and quicken current sorter simultaneously has became more feasible. To break monopolization of foreign currency sorter, the advanced financial facility company instituted an important goal to research and develop currency sorter which used the streamlined CMOS chip technology and it has both good performance and low price.Firstly, the current status of the bill sorter development is summarized, then a system has been established which consists of five parts, that is, image process portion(including TMS320C6414 and memories),input channel(included contact image sensor, analog-digital converters and buffers),logic controller, debugger(JTAG) and power manager.The key component of this system is the DSP chip TMS320C6414 made in TI. The logic is controlled by CPLD. This DSP owns powerful capabilities of processing datum, 1024 KB internal Cache/RAM structure and abundant resource of integrated peripherals. It can execute varieties of tasks, which are required by bill image processing algorithm, and is fit for the rigorous demand of real-time. There are two innovations in the hardware system in currency sorter field. One of the innovations is that the TMS320C6414 is applied on currency sorter system for the first time. This project...