此程序为第五套人民币面值为20，50，100的识别，程序中有四种识别方法，第一种为纸币的长宽比确认，第二种为通过纸币头像部分的主色调的面值识别，第三种为纸币正面左下角的面额数字的识别，第四种为纸币正面中间的面值数字的识别。-This program is the fifth set of RMB nominal value of identifiable 20,50,100, the program has four identification methods, the first one is the aspect ratio of the banknote, the second by the nominal value is recognized as part of the main colors of banknotes Avatar identify the lower left corner of the front third of the banknote denomination figures, the fourth digit of the nominal value of banknotes to identify the front in the middle.