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图像分析效率是数字散斑相关方法(DSCM)在岩土工程试验应用中的关键问题之一,而一些岩土类材料在荷载作用下的位移大小与方向具有缓慢变化的图像特征。为提高DSCM图像分析效率,提出了一种基于岩土渐进变形特征的“局部定向搜索”(LDSM)优化分析方法,给出了该方法适用的前提条件以及具体算法和实用公式,并在自行研制的数字照相量测软件Photo Infor中编程实现了相应功能。此外,给出了“局部定向搜索法”的关键参数——搜索角度的推荐取值范围(30°~45°)。研究表明:“局部定向搜索”优化方法分析结果与常规方法相同;在搜索角度为45°时,其计算效率相对于常规方法提高(1.3~1.6)倍;随着测点数量的增多,计算效率呈现出一定的稳定性。局部定向搜索法对于DSCM在岩土力学与工程试验研究领域中的广泛应用,具有比较重要的的实用价值。
The efficiency of image analysis is one of the key issues in the geotechnical engineering application of digital speckle correlation method (DSCM). However, some geotechnical materials have slowly varying image characteristics in displacement and direction under load. In order to improve the efficiency of DSCM image analysis, a method of “Local Directed Search” (LDSM) based on progressive deformation of geomaterials is proposed. The preconditions, specific algorithms and practical formulas for this method are given. Self-developed digital photogrammetric software Photo Infor programming to achieve the corresponding function. In addition, the key parameter of “local directional search method” is given - the recommended range of search angle (30 ° ~ 45 °). The results show that the results of the “Localized Directional Search ” method are the same as those of the conventional method. When the search angle is 45 °, the computational efficiency is 1.3 ~ 1.6 times higher than that of the conventional method. With the increase of the number of measuring points, The calculation efficiency shows a certain stability. Local directional search method for DSCM in the field of geotechnical and engineering experiments widely used, has more important practical value.