通过分析第五版人民币的特征，利用纸币中央数字的特征提取和识别的方法，通过MATLAB软件实现对第五版人民币的100元、50元和20元的识别。(By analyzing the characteristics of the fifth edition of RMB, using the method of extracting and identifying the central number of banknotes, the fifth edition of RMB can be ident