基于图像分析的纸质水位资料数字化技术研究  

Water Level Sheet Digitization Technology based on Image Processing

作　　者：李士进[1] 占迪[1] 高祥涛[2] 柏屏[2] 

机构地区：[1]河海大学计算机与信息学院,江苏南京210098 [2]江苏省水文水资源勘测局,江苏南京210029

出　　处：《水利信息化》2015年第5期11-16,29,共7页Water Resources Informatization

基　　金：江苏省重点研发计划项目(BE2015707);江苏省水利科技项目资金资助(2012034)

摘　　要：在水利领域,常使用纸质坐标网格图纸记录数据信息。随着时间推移,逐渐出现纸质磨损、纸张老化等现象,进而影响这些历史资料的安全及使用价值。人工将这些纸质资料录入计算机,工作量大且易出错,因此很有必要研究纸质资料数字化技术。提出利用数字图像处理技术,实现一个纸质水位资料数字化原型系统,经过图像分割、交点定位和形变校正3个主要步骤,对纸质水位资料中记录的数据进行自动提取,并存入数据库。多幅图像的实验结果表明,提出的纸质水位资料数字化技术能够以较高精度提取出整点时刻水位数据,可供计算机查询和水文水资源等专业进行分析应用,具有较重要的专业意义和应用价值。In hydrology domain, the grid drawing sheet is commonly used to record the observations from sensors. These paper drawings may be destroyed and contaminated due to improper preservation or overuse. Furthermore, it will be a heavy workload and prone to error if these data are manually transcripted into the computer. Hence, in order to digitize these drawings, establishing the corresponding data base will ensure the integrity of data and provide invaluable information for further research. This paper presents an automatic system for hydrological record image digitization, which consists of three key techniques, i.e., image segmentation, intersection point localization and distortion rectification. After the digitization of the curves, the automatically recovered measurements are stored into the data base. Experiments on several real water level records show that our proposed techniques are effective and capable of recovering the hydrological observations accurately, which can meet the requirements of hydrological sheet digitization. The recovered digital record can be further analyzed by professionals from water resources domain and thus validates the value of this study.

关 键 词：图像分析 纸质水位资料 数字化 图像分割 畸变校正 

分 类 号：P337[天文地球—水文科学]