点钞机冠字号图像采集系统研究

发布时间：2018-02-27 01:20

本文关键词： 点钞机纸币冠字号采集 DSP 高速　出处：《沈阳工业大学》2014年硕士论文　论文类型：学位论文

【摘要】：依据2010年颁布的最新版中华人民共和国国家标准《人民币鉴别仪通用技术条件》GB16999-2010，为使点验钞机达到A级性能指标，要求点验钞机必须具备纸币冠字号识别功能。由此可见，纸币冠字号采集模块已经成为一个重要的研究项目。针对此问题，，本文以出钞速度为每秒20张的A类点钞机为研究对象，在其中嵌入纸币冠字号采集和识别模块，实现在点钞验钞的同时识别出纸币冠字号。本文在A类点钞机中嵌入主要基于数字信号处理器（DSP）和复杂可编程逻辑器件（CPLD）的点钞机人民币纸币冠字号识别系统。本系统是在点钞机传送机构的传送下，纸币通过上下对称的两个接触式图像传感器和测量电路成像，在图像处理专用高频处理器DSP内，通过自编软件实现图像中纸币和冠字号的定位，在下一张纸币到来之前完成冠字号的采集与识别，点钞机运行结束时，可以在显示屏上显示出每一张纸币的冠字号，不需要外接计算机。本论文的特点是可以实现高速、高分辨率的纸币采集，并且具有可见光、红外光和紫外光的采集图像。实际运行结果表明，装置能够实时完整采集到三种光照下的纸币正反两面图像。本系统主要由纸币位置检测单元、纸币图像采集单元、纸币冠字号识别单元、冠字号显示单元构成。其中纸币位置检测单元利用了点钞机上的红外对管和码盘信号；纸币采集单元主要由两个上下正对称的线阵接触式图像传感器、模拟信号处理器和数字信号处理器组成；数据显示单元通过串行数据总线将识别后的结果传送给ARM，ARM处理数据后，控制识别后的冠字号显示在液晶屏上；整个系统利用CPLD产生时钟和时序信号，保证了系统能够快速采集和识别。
[Abstract]:According to the latest People's Republic of China national standard < RMB identification instrument general technical conditions issued in 2010 >GB16999-2010, in order to make the point detector A-level performance index requirements of the point detector must have a banknote crown size identification function. Thus, notes the crown size acquisition module has become an important research project. Aiming at this problem, this paper takes a note a speed of 20 frames per second currency-counting machine as the research object, in which the embedded banknotes crown size acquisition and recognition module, realize the identification of banknotes in the banknote counting crown size at the same time.
This paper mainly embedded in a currency-counting machine based on digital signal processor (DSP) and complex programmable logic device (CPLD) of the currency-counting machine RMB banknote crown size recognition system. This system is in a conveyor mechanism currency-counting machine under the bill through an asymmetric two contact image sensor and measuring circuit in imaging. Image processing of special high frequency processor DSP, the software realization of banknotes in Wacom brand image positioning, complete acquisition and recognition of the size of the crown before the next bill arrives, the end of operation currency-counting machine, can be displayed on the crown size of each note, does not need the external features of the computer. This can be achieved with high speed, high resolution and money collection, with a visible light image, infrared light and ultraviolet light. The actual operation results show that the device can complete real-time acquisition of three The paper money under the light is both positive and negative.
This system is mainly composed of banknote position detecting unit of banknote image acquisition unit, notes the crown font recognition unit, a display unit of the crown size. Note the position detection unit using the currency-counting machine on the infrared tube and the encoder signal acquisition unit consists of two notes; on a symmetrical array contact image sensor, simulation signal processor and digital signal processor; data display unit through the serial data bus will identify the results sent to the ARM, ARM data processing, control the crown size after recognition and displayed on the LCD screen; the whole system using CPLD clock and timing signal, to ensure that the system can fast acquisition and recognition.

【学位授予单位】：沈阳工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TH693.5;TP274.2

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