摘要
现有的墨点形态特征检验方法由于在提取特征前缺少形态学滤波过程,使得墨点图像色度不均,导致检验结果受噪声影响大、检验结果不可靠,对此提出一种复印文件笔画边缘墨点形态特征定量检验方法。把膨胀与腐蚀运算依据不同顺序级联组成开启与闭合运算,分别利用开、闭运算去除较小的过亮和过暗细节,通过形态学滤波使得图像色度均匀;选择8×8方形结构算子,通过膨胀运算与腐蚀运算实现墨点图像边缘提取,结合二值化处理获得边缘信息,并检验墨点边界周长、直径、面积、圆度、矩形度及伸长度6个形态特征,实现特征定量检验。实验结果表明:该方法可有效滤除噪声、均匀图像色度,边缘的提取效果较好,并且通过该方法获取的边缘墨点形态特征检验结果与实际结果最为接近,应用价值最高。
The existing ink dot morphological feature test method lacks the morphological filtering process before extracting features,which makes the ink dot image chromaticity uneven,which may lead to the problem that the test result is greatly affected by noise and the test result is unreliable.Quantitative test method for morphological characteristics of ink dots on the edge of a copy document.The expansion and corrosion operations are cascaded according to different sequences to form open and close operations,respectively,using open and closed operations to remove smaller over-bright and too dark details,and morphological filtering to make the image chroma uniform;select 8×8 square structure,through the expansion operation and corrosion operation to achieve the edge extraction of the ink dot image,combined with the binarization process to obtain the edge information,and test the ink dot boundary perimeter,diameter,area,circularity,squareness and elongation a total of 6 morphological features,to achieve quantitative testing of features.The experimental results show that the proposed method can effectively filter out the noise and uniform image chromaticity,and the edge extraction effect is better.The edge dot morphological feature test results obtained by this method are the closest to the actual results,and the application value is the highest.
作者
李志荣
LI Zhi-rong(Department of Document Examination Technology,Criminal InvestigationPolice University of China,Shenyang 110035,China)
出处
《科学技术与工程》
北大核心
2020年第3期1125-1130,共6页
Science Technology and Engineering
基金
公安部科技强警基础工作专项(2015GABJC05)。
关键词
复印文件
笔画边缘
墨点
形态特征
定量检验
copy file
stroke edge
ink dot
morphological feature
quantitative test
