银行等一些特殊部门要对大量的硬币进行高效的处理，如计数、分类、包装等以使其再流通，无人售票车、投币电话等需要对硬币进行实时识别，自动售货机除了识别之外，还要提供找零功能等。而且在目前在世界范围内，硬币以其成本低，流通次数多、耐磨损、易回-Banks and other special departments to the efficient handling of a large number of coins, such as counting, sorting, packaging, etc. so that it is recirculated, unmanned vehicles, payphone requires real-time identification of the coin, the vending machines in addition to the identification, but also provide a homing function. And at present in the world, the coin with its low cost, the number of circulation, wear-resistant, easy to back