基于ARM及CPLD的纸币图像采集系统的设计

Design of the Image Acquisition System of Paper Based on ARM and CPLD

介绍了一种自行设计的基于ARM及CPLD技术,利用接触式图像传感器(CIS)采集纸币号码的图像采集系统,提出了一种实时采集高速图像信息及图像预处理的方法;系统以硬件设计为主,采集到的CIS图像信号经过明暗输出补偿、二阶滤波、模数转换、二值化等前置调理,保存在同步动态内存(SDRAM)中,供ARM作进一步图像处理;系统中CIS传感器的时序信号由CPLD设计,实验表明,采集到的二值化图像清晰;这项研究成果可以推广到证券、票据号码的录入系统以及其他相关领域的字符识别系统。

A sort of image acquisition system of paper＇s number with CIS （Contact Image Sensor ） based on ARM and CPLD is introduced. A real- time approach is brought out to collecting high-speed image information and image pretreatment. This system is mainly designed of hardware, the collected CIS image signal is saved in the SDRAM （ synchronous dynamic random access memory） through pretreatment of occulting output compensation, secondary filter, analog digital converter and binaryzation, getting ready for further image processing by ARM. The driving signal in CIS is designed by CPLD. And the collected image of binaryzation shows clear in the experiment. This research output can be extended to not only the entry system of securities and bill character, but also other fields characters identification system.