抗环境光照影响的边坡变形摄像监测方法

边坡变形监测是滑坡灾害防治和预警的重要手段,基于图像分析的近景摄影测量方法凭借全场、非接触的优势在边坡变形监测中的应用越来越广泛.而在长期野外监测应用中,环境光照变化对边坡图像的灰度一致性产生很大影响,导致该方法的测量精度受到严重制约,甚至出现测量失败的情况.从环境光照的物理过程出发,深入分析光照变化特征及其对图像灰度...

Study on the Method of Slope Deformation Camera Monitoring Resistant to Environmental Light

Slope deformation monitoring is an important means in the prevention and early warming for landslide disaster.. The close-range photogrammetry based on image analysis has been widely used in the field of slope deformation monitoring with the advantages of full-field and non-contact. However, considering the fact that the change of environmental light reduces the gray consistency of captured slope images in the long-term field monitoring application, the close-range photogrammetry will be seriously limited in measurement accuracy and even fail. In this investigation based on the physical process of environmental lighting, the characteristics of lighting changes and their impact on image grayscale were deeply analyzed, and an image matching method based on gray gradient direction characteristics was proposed with the ability to resist the interference of environmental light. The results of indoor slope shrinkage model experiment and real field slope observation experiment show that this method can effectively suppress the influence of environmental light, improve the accuracy and stability of deformation measurement. A new idea is provided for slope deformation monitoring using photogrammetry and plays a supporting role in the practicality of photogrammetry.