基于图像处理的封印Data Matrix码验证方法

A sealing Data Matrix verification method based on image processing

在对电能计量装置上的Data Matrix码进行识别过程中,拍摄角度、光照等因素会给识别过程带来困难.针对这一问题,提出一种基于局部阈值与Otsu算法的Data Matrix码识别算法.该算法首先将彩色图像进行灰度化处理,并使用中值滤波算法滤除噪声,将局部阈值与Otsu算法相结合来实现对Data Matrix码图像的二值化处理;然后,利用腐蚀、膨胀等算法进一步滤除背景,采用Canny算法检测Data Matrix码边缘;最后,使用Hough变换提取L形区域,并进行旋转、插值等操作实现对二维码区域的识别.实验结果表明,本方法在复杂光照、复杂拍摄角度的条件下,可实现对Data Matrix码的完整提取与识别,对Data Matrix码在电能计量装置上的推广有重要意义.

In the process of recognizing Data Matrix code used in the electric energy metering device,the shooting angle,illumination may cause difficulty.Aiming at this problem,this paper proposes a Data Matrix code recognition algorithm based on local threshold and Otsu algorithm.The algorithm firstly gradates the color image,and uses the median filtering algorithm to filter out the noise.The local threshold is combined with the Otsu algorithm to realize the binary processing of the Data Matrix code image.And then,the corrosion algorithm and expansion algorithm are utilized to further filter out the background,and the Canny algorithm is used to detect the edge of the Data Matrix code.Finally,the Hough transform is used to extract the L-shaped region,the rotation operation and interpolation operation are performed to realize the recognition of the twodimensional code region.The experimental results show that the method can realize the complete extraction and identification of Data Matrix code under the condition of complex illumination and complex shooting angle,which is of great significance to the promotion of Data Matrix code on electric energy metering device.