Coins are inseparable from people's daily life. Coins recognition research has been started at home and abroad for a long time. In this field, research has been carried out earlier in foreign countries, and a lot of work has been done. The products developed can also be roughly divided into three grades: low-grade, middle-grade and high-grade. The low-grade sorting speed is less than 1000 pieces per minute, the middle-grade is about 1000-1500 pieces per minute, and the high-grade is more than 1500 pieces per minute. There are two main types of sorting methods used, one is based on physical technology, the other is based on performance indicators. High-speed sorting basically uses performance indicators for sorting.
Many international banking equipment companies have also done a lot of work. For example, Scan CoinAB, Sweden, is a company specializing in the production of various banking instruments. It is also internationally recognized as the best company in banking instruments. It has developed a series of sorting systems for different monetary systems. However, China's currency is relatively complex, and there are still a series of problems in the application of their system in China. In domestic use, the misjudgment rate is less than 0.5%, but the company's products are expensive, and there is a technological monopoly. From the development trend, relying on foreign enterprises blindly is not conducive to the development of our national economy. Therefore, in reality and in the long run, it is necessary to master the core technology of coin recognition, possess independent intellectual property rights, break monopoly and improve international competitiveness in this field.