基于局部透视变换的圆柱体侧表面PDF417条码矫正方法

摘要

PDF417条码作为一种应用广泛的二维条码,正在逐步应用于标识各种商品.目前,对于生活中很常见的圆柱体商品,其侧表面PDF417条码的识别还没有研究报导.本文提出了一种基于局部透视变换的图像矫正算法,将圆柱体侧表面PDF417条码分割为若干子区域,然后对各个子区域分别进行透视变换,将各个子区域分别矫正之后再行拼接,最后得到平面PDF417条码的图像.实验结果表明,该方法可以有效地将圆柱体侧表面的PDF417条码矫正为平面PDF417条码,并且正确地解码出条码所含信息.%The PDF417 barcode,as one of the widely used two-dimensional barcodes,is being applied to various kinds of goods. There are few researches on the recognition of the PDF417 barcode upon cylinder side surface,though goods in cylinder shape are common in life. To rectify the PDF417 barcode,an algorithm based on local warp perspective transformation is proposed. The PDF417 barcode upon cylinder side surface is segmented into several sub areas first,then the perspective transformation will be done on these sub areas. Finally, these sub areas are joined together and the rectified barcode is obtained. Experimental results show that this algorithm can effectively transform the PDF417 barcode upon cylinder side surface into one upon plane,so that the contained information can be decoded successfully.