龙门石窟奉先寺的红外成像监测与分析——基于MATLAB图像处理技术

Infrared imaging monitoring and analysis of Fengxian Temple at Longmen Grottoes based on MATLAB image-processing techniques

龙门石窟奉先寺的安全长期受到风化及渗水等病害影响。针对奉先寺石造像阿难头部区域及卢舍那大佛南侧渗水区域,利用红外成像设备对该区域进行为期一年的实时监测,并借助MATLAB语言的图像处理技术对大量红外图像进行数据分析。结果发现佛像头部裂隙处存在温差引起的循环热应力,该温差主要由灌浆加固区域和岩体本体之间热传导性能差异导致,且晴天上午前后的温差应力变化最显著;归纳了监测期间降雨和渗水发生的时间规律,统计得出了不同区域渗水程度的差异。将红外成像和大数据分析结合应用于石窟预防性保护中,实现了对病害同时进行图像监测和统计评估,为其他石窟寺的监测与数据分析工作提供参考。

The safety of Fengxian Temple at Longmen Grottoes has long been threatened by weathering and water seepage.An infrared imager was used to monitor the head area of the Ananda stone statue at Fengxian Temple and the water-seepage area on the south side of Locana Buddha for one year,and many infrared images were collected and analyzed using MATLAB image-processing techniques.The results show that there is a cyclic thermal stress caused by temperature difference at the fissure of the Buddha’s head.This temperature difference mainly comes from the difference in thermal conductivity between the grouting area and the rock;the change of thermal stress is the most significant around the morning of a sunny day.The temporal pattern of water seepage during the monitoring period was summarized,and the degree of water seepage in different areas was statistically calculated.The combination of infrared imaging and big data analysis was applied to the preventive conservation of the grottoes in order to achieve the image monitoring and statistical assessment of deterioration simultaneously.This work provides a reference for the monitoring and data analysis work at other grottoes.