摘要： 变造币是一种利用拼接技术合成的假币。针对第5 套人民币中100 元的图像特征，文章提出了两种利用模板匹配识别变造币横竖条码的方法。一种方法是运用传统的二维模板匹配算法，依次截取横条码中的字符与竖条码中的对应字符比较，依据模板和目标图像的相关性判断它们是否相同；另一种方法是分别得到横竖条码在水平和垂直方向的一维灰度投影曲线，根据它们的相关性判断两幅图像是否匹配。实验结果表明这两种识别方法均精确快速有效。

关键词: 变造币；横竖条码；数学形态学；模板匹配；灰度投影曲线

Abstract: Composite-RMB is false money which stick some parts of real money and some parts of counterfeit money together by adhesive tape.In this paper, two algorithms based on cyclostyle matching are proposed for recognizing horizontal and erect numbers of composite-RMB, especially for 100 yuan RMB of fifth series. One method uses 2-D cyclostyle matching algorithm to select characters of horizontal list and compares with erect list if its not homology; The other method uses 1-D cyclostyle matching algorithm to obtain horizontal and erect gray scale projection curves of two list images, then compares with them if its not homology. The methods are proved to be highly effective by many simulated data.

Key words: Composite-RMB; Horizontal and erect characters; Mathematical morphology; Cyclostyle matching; Gray scale projection curve