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本科毕业设计说明书
题目:基于数字图像处理的条形码识别方法
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二〇一二年六月
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。本文研究的是一种基于图像处理方式的识读方法,该方法是采用摄像头采集条码图像,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,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。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;相似边距离;MATLAB
Abstract
Bar code technology is now one of the most widely applied to identify and one of input technology, because it contains large amount of information, the error rate is low and recognition in all respects, got a lot of attention. It developed rapidly and widely used in the industrial, commercial, and book publishing, medical and health, and other industries. The present development situation of our, bar code by the normal use of the bar code printing quality and goods transportation influence, and the traditional way with barcode is adopting photoelectric device to read, barcode image of different light reflection effects also will affect the barcode to read.
Different codes have different reading process. This paper is a study of the mode recognition method based on image processing, the method is to use a camera image acquisition bar code, one-time acquisition barcode image method avoided the linear scanner manufacture progressive-scan generated and, at the same time, simplify the bar code image scanning operation. Then through certain digital image processing algorithm processing decode. Decoding algorithm are divided into two parts: the first part of the first image preprocessing collection bar code, this will lay the foundation behind achieve correct decoding; The second part is the bar code image after pretreatment decoding, the use of statistical methods, ac