基于小波多分辨率分析的 PDF417 定位算法

为提高二维条码自动检测定位的效率, 提出了一种利用小波多分辨率分析进行 PDF417 二维条码自动检测定位的新方法, 该方法在高频子图基于特征向量利用纹理相似性原理, 采用区域增长法产生二维条码数据区域的候选子区域集合, 然后在低频子图利用二维条码的起始符、终止符及其边界特征对候选子区域进行验证, 最后得到二维条码在图像中的位置. 实验证明该方法能准确定位受到不同污损程度的二维条码图像, 特别在污损程度高的情况下, 该方法具有独特的优势.

Location Algorithm of PDF417 Based on Wavelet Multi-resolution Analysis

To improve the efficiency of detecting and locat- ing PDF417 two-dimensional barcode,an automatic detecting and locating approach based on wavelet multi-resolution analy- sis is presented,in which the regional growth method based on feature vector and texture comparability theory is adopted to produce the candidate sub-area set of two-dimensional barcode in high frequency sub-images,and then the candidate sub-area set are verified by examining the start/stop pattern and edge characteristics of PDF417 in low frequency sub-image to gain the location of PDF417 in original image.Experiments show that the approach can detect and locate exactly the two dimen- sional barcode for PDF417 with different backgrounds,and is superior to the traditional algorithms in practicability.