Q235钢在模拟大气环境中早期腐蚀图像小波包分析.PDFVIP

中国腐蚀与防护学报 Journal of Chinese Society for Corrosion and Protection Q235 钢在模拟大气环境中早期腐蚀图 像小波包分析 韩夏冰 高志明 党丽华 王 迎 毕慧超 天津大学材料科学与工程学院 天津300072 摘要：应用适用于现场暴露试样的三维腐蚀形貌图像采集系统对Q235 钢在模拟大气环境中的腐蚀形貌 图像进行了采集。所得图像统一转换为灰度图像，进行中值滤波处理。为了更好的观察图像的细节信息， 根据熵标准应用小波包变换对预处理后的图像进行分解，选取最优子图像后并提取其能量值。结果表明， 根据图像能量值的变化可以对腐蚀试样进行定性的判断，而进一步根据计算出的图像特征值可以定量判断 大气腐蚀早期腐蚀程度。 关键词：大气腐蚀 腐蚀形貌 小波包变换 图像分析 腐蚀预测 1 中图分类号：（请补充中图分类号） 文献标识码： A 文章编号：1005-4357(2010)xx-0000-00 v 8 Wavelet Packet Analysis of Early Corrosion Image of Q235 Steel in 5 Simulated Atmospheric Environment 4 0 0. HAN Xiabing, GAO Zhiming, DANG Lihua, WANG Ying, BI Huichao 1 School of Material Sciences and Engineering, Tianjin University, Tianjin 300072, China 1 6 Abstract: The corrosion morphology of Q235 steel in simulated atmospheric environment 1 was obtained using the established image acquisition system. In order to gain the detailed 0 information of the images, wavelet packet– based image analysis method was applied to 2 : decompose the improved images and energies of sub-images (according to the Shannon entropy v i standard to choose the optimal sub-images with high regularity) were extracted as characteristic X information. The results showed that the corrosion extent of Q235 steel specimens was a n qualitatively analyzed which correlated well with the change of the energies of sub-images. The i relationship between the characteristic information and corro