二维条形码印刷在商品表面后不可避免的受到环境的影响，复杂的背景、光线、污损、残缺等因素都会影响摄像头获取的条形码图像的质量，从而干扰到二维条形码的成功识别。如何克服噪声的影响，将条形码从图像复杂的背景中准确的定位出来并快速识别出其所包含的信息是本文所研究的重点，在此基础上整个条形码识别系统的构成也是需要探讨的问题。-After the 2D bar code is printed on the surface of product,it will be influenced by the circumstance,background,light,dirty and deformity will influence the quality of bar code image,therefore,it will disturb the successful recognition of 2D bar code.How to get over the disturbing of noise and locate the bar code precisely from the background and read the information quickly is the research point of this paper,as well as the whole reader system based on that technology.