毕业设计（论文）-条码检测系统—基于MATLAB的一维条码识别.doc

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华侨大学教务处印制
年月
条码检测系统——基于MATLAB的一维条码识别
摘要:条码技术是如今应用最广泛的识别和输入技术之一,由于其包含的信息量大,识别错误率低而在各个方面得到很大的重视。它发展迅速并被广泛应用于于工业、商业、图书出版、医疗卫生等各行各业。由我国目前发展现状来看,条码的正常使用受到条形码印刷质量和商品运输过程的影响,并且传统的条码识读方式是采用光电识读器,条码图像对光的不同反射效果也必然会对条码的识读产生影响。
不同的条码有着不同的识读过程。本设计研究一种基于图像处理方式的识读方法,通过计算机辨识来解决条码印刷质量不佳和条码变形等问题。该方法是采用摄像头采集条码图像,通过照相,一次性采集条码图像的方法避免了线性扫描器逐行扫描所产生的问题,同时简化了扫描条码图像的操作。然后通过一定的数字图像处理算法处理进行译码。译码算法主要分为两部分:第一部分首先对采集的条码图像进行预处理,这将为后面实现正确译码打下基础;第二部分就是对预处理后的条码图像进行译码,我们将利用统计方法、根据相似边距离来判别条码字符,再通过译码、校验、纠错处理来识读条码,得到条码所表示的文本信息。与用条码识读器硬件进行译码相比,软件译码具有更大的灵活性和较低的成本,因此具有很大的发展潜力。本设计在Matlab软件语言环境下实现。
关键词:图像处理条码识别 EAN-13 相似边距离 Matlab
The System Of Bar-Code Examination
—— 1D Bar-Code recognition based on MATLAB
Abstract: Nowadays Bar-Code is a very popular technique ofidentification and input. It has been taken serious because of it’s large information and low error rate. It develops very quickly and has already been applied in merce,publishing,medical sanitation and so on. It can be seen from the actualities in our country that the use of Bar-Code is influenced by the printing quality and goods transportation, and besides, the traditional mode of recognition is using optical scanner so that the recognitinon will be consequentially affected by the different reflection of code image by the light.
Different Bar-Code has different recognition process. This paper researches into a method based on digital image processing mode to resolve the problems of poor printing quality and code distortion, which uses the vidicon to take pictures of code images so as to avoid the traditional questions brought by the line-by-line scanning. And then applies the digital image processing algorithms to recognize the code, which includes two steps: the first is image pretreatments, the second is using statistic method and the distance of edge to similar edge method to rec