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针对路面裂缝损伤评定指数(PCI)计算方法没有顾及裂缝空间相关性的问题,在面向像素的损伤统计计算基础上,重构只含裂缝和背景的二值影像,利用网格法快速计算单个裂缝的分形维值,作为计算裂缝损伤度的有效贡献值,提出了融合裂缝影像分形维值的路面损伤评价指标(FPCI)。计算均方差误差率和相关系数来评价不同裂缝的空间关系,通过计算多个道路影像的裂缝损伤指数,构建了融入裂缝整体特征和裂缝间相互关系的路面裂缝损伤评价模型,并对20幅不同类型的水泥和沥青路面影像进行试验分析。研究结果表明:对同一幅图像,FPCI与实际损伤度(PPCI)最大相差绝对值为0.5%,最小相差绝对值为0.1%,而PCI试验结果与PPCI的最大相差绝对值为1.3%,最小相差绝对值为0.4%,说明FPCI方法比PCI方法更能准确刻画路面的损伤情况;PCI损伤度与实际损伤度间的均方根误差大于FPCI损伤度与实际损伤度间的均方根误差,FPCI比PCI更能体现路面裂缝的损害程度;FPCI在数理统计的基础上加入了裂缝的相关特征和空间几何特征分形维值,比PCI评价计算更趋合理,能更准确地表征路面裂缝损伤程度,可推广到路面坑槽、沉降、龟裂等其他类型损伤程度的量化计算。
In view of the fact that the calculation method of pavement crack damage index (PCI) did not take into account the spatial correlation of fractures, based on the pixel-oriented damage statistics, reconstructed binary images containing only cracks and background, As an effective contribution to the calculation of the degree of fracture damage, a fractal dimension evaluation index (FPCI) of fusion fractures was proposed. The mean square error rate and correlation coefficient were used to evaluate the spatial relationship of different fractures. By calculating the fracture damage index of several road images, the evaluation model of pavement crack damage integrated with the overall characteristics of fractures and fractures was established. Type of cement and asphalt pavement images for experimental analysis. The results show that the absolute value of the maximum difference between FPCI and actual injury degree (PPCI) is 0.5% and the absolute value of the minimum difference is 0.1% for the same image, while the absolute difference between the maximum difference between PCI and PPCI is 1.3% The absolute value of 0.4%, indicating that FPCI method is more accurate than the PCI method to characterize the damage of the road surface; PCI damage degree and the actual degree of injury between the root mean square error greater than the FPCI damage degree and the actual degree of injury between the RMS, FPCI Compared with PCI, the damage degree of pavement crack can be more reflected. FPCI added fractal dimension and fractal dimension value based on mathematical statistics, which is more reasonable than PCI evaluation and calculated, which can more accurately characterize the degree of pavement crack damage, Can be extended to the road pit, settlement, cracks and other types of quantitative damage calculated.