条形码知识

摘要伴随着科学技术口益发展的今天，条形码己经成为了一种商品交易语言，市场上的商品都会通过不同类型的条形码对其进行标识。越来越发达完善的条形码技术，推动了电子商务的发展，提高了生产和经营效率。随着计算机网络的快速发展和智能手机等设备的应用，通过对条形码进行拍照并利用网络，可以方面的了解商品的信息、辨别商品的真伪，而且还可以很快了解相关商品的信息。因此，这就需要通过运用图像处理和识别的相关方法来实现对条形码的定位和识读。通过采用图像处理方法，我们可以改善图像质量，减少或者消除噪声、光照不均、图像模糊等对条形码识别带来的影响，然后对条形码区域的实现自动定位，并进行条形码的识读和译码。在本论文中，首先对商品条形码的编码规则进行了论述。然后通过运用数字图像处理算法实现了对商品条形码区域的定位。最后针对手机等设备拍摄的条形码图像因光线不足导致分辨率较低和大量的噪声、设备的抖动导致的图像模糊、拍摄角度的原因导致的视角倾斜等问题，我们提出了一种新的基于条形码投影曲线的识读方法和基于全局和局部的欧氏距离算法实现了对条形码的识读。本论文算法己在MATLAB环境下进行仿真实现。通过在条形码库上进行测试，结果反映了我们的算法很够很好的对低分辨率、不同距离、视角倾斜、光照不均和图像模糊的条形码图像进行识别，并且此方法具有简单，识别率高，实时性等优点。关键词:商品条形码;条形码定位;条形码识别;投影曲线;解码technologypromotesthedevelopmentofelectroniccommerce,improvesproductivityandoperatingefficiency.Withtherapiddevelopmentofcomputernetworksandtheapplicationofsmartphonesandotherequipment,firstwecanunderstandtheinformation,identifytheauthenticityofthegoods,butalsopicturesforbarwecanquicklyunderstandtheinformationoftherelevantgoodsbytakingcode,andthenrecognitionneedtobeusedtousingthenetwork.Themethodsofimageprocessingandlocatethebarcodearea.Usingdigitalimageprocessingmethod,thequalityoftheimagecanbeimprovedfirst,toreduceoreliminatethebadeffectsonbarcodereadingcausedbynoise,nonuniformillumination,imageblur,etal.Thenwecanlocatethebarcodearea,readanddecodethebarcode.Inthispaper,firstofalltheencodingrulesofbarcodeforcommodityarediscussed.Thenusingdigitalimageprocessingmethods,thebarcodeareaislocalized.Finally,forthelowqualityofthebarcodeimagestakenbymobilephonesandotherequipmentincludinglowresolutionandalotofnoiseimageangles,blur,perspectivetiltbecauseofinsufficientlightequipmentshakeandcamerarespectively,weproposedanewmethodsbasedprojectioncurveandanewbarcodedecodingmethodsbasedlocalEuclideandistancealgorithm.barcodereadingontheglobalandThealgorithmsinthispaperlibraryareallsimulatedinMATLABenvironment.Varioustestresultsinthebarcodeshowthatouralgorithmsforbarcodelocalizationandrecognitionareeffectiveforimagenoise,nonuniformillumination,imageblur.AndThealgorithmshavetheadvantagesofsimple,highrecognitionrate,real-timeetc.Keywords:barcodeforcommodity;barcodelocalization;barcoderecognition;projectioncurve;decode目录摘要...........................................................................................................................................IAbstract...............................................................................................................................……II第一章绪论............................................................................................................................61.1条形码的技术概述.....................................................................................................61.1.1条形码的发展历史..........................................................................................61.1.2我国条形码技术的应用现状..........................................................................41.1.3条形码技术的优点.........................................................................................._51.1.4条形码的分类.................................................................................................._51.1._5一维条形码和二维条形码的区别..................................................................71.2本课题研究背景和研究内容.....................................................................................81.3国内外研究现状.......................................................................................................101.4章节安排...................................................................................................................121._5本章小结...................................................................................................................12第二章相关技术基础............................................................................................................132.1条形码编码规则.................................................................................................……132.1.1本文主要研究对象..................................................................................……132.1.2EAN-13的商品条码结构.............................................................................142.1.3EAN-13条形码字符集的二进制表示.........................................................162.1.4EAN-13条形码的前置码.............................................................................162.1.5EAN-13条形码的校验.................................................................................182.1.6UPC-A商品条形码结构...............................................................................192.1.7商品条形码的识读原理................................................................................192.2图像处理相关技术...................................................................................................202.2.1灰度变换........................................................................................................202.2.2改进的sobel边缘提取算法.........................................................................232.2.3中值滤波........................................................................................................242.2.4均值滤波........................................