QR码图像预处理中的滤波研究_邹雄.pdfVIP

31 3 Vol. 31 No. 3 2010 5 Journal of Applied Optics May 2010 : 1002-2082(2010) 03-0413-05 QR 邹　雄, 刘国栋, 曾文平 ( , 330013) 摘　要: QR 码图像采集过程中会出现椒盐噪声, 为了在滤除图像椒盐噪声 同时能很好地保持 图像 细节, 将几种常用中值滤波方法应用到 码 图像预处理中, 进 一步对其结果进行比较, QR 得出QR 码图像中值滤波 规律。据此提出利用窗口系数 新中值滤波方法, 先二值化, 然后进 行基于滤波窗系数 中值滤波处理, 经过实验比较找到一组系数。实验结果表明: 将该系数 中 值滤波用在QR 码图像预处理中可以大大提高译码 效率和准确率。在加噪 一定情况下, 实验 识别率达到了100% 。 关键词: 二维码; QR 码; 中值滤波; 滤波窗系数; 图像预处理 : TN911.73; TP751. 2: A Fil tering f or QR code image pre-processing , - , - ZOU Xiong IU Guo dong ZENG Wen ping (Jiangxi ScienceTechnology Normal University Nanchang, 330013, China) Abstract: Salt and pepper noise often appears in the acquisition of QR code image. In order to reduce salt and pepper noise as well as maintain image details, median filtering is fequently used - - . , in two dimensional code image pre processing However the typical median filtering algorithm requires a lot of time Several median filtering methods were applied to the QR code image. preprocessing, then the results were compared and Q R code image median filtering rules were obtained, the new median filtering method was proposed, which used the window coefficients. Binarization is the first step then the binary image is processed by median filtering based on, filtering window coefficients, and a group of data is obtained through the experimental comparison. T he experimental results show the decoding efficiency and accuracy are greatly improved when this coefficients median fitering is adopted in the QR code image preprocess