利用数字图像相关性实现岩土自动跟踪

为了实时了解岩土微细结构动态演变规律，针对土颗粒在载荷下的移动特点，研究了适于岩土自动跟踪系统的图像相关性计算公式、配准模板、搜索区域. 通过比较4 种相关系数的计算耗时、峰度、统计分布，提出在相关性计算公式中用平方运算代替一般的开方运算，并将正方形模板和正方形搜索区域改为矩形模板和矩形搜索区域，充分利用模板的灰度信息，满足了岩土跟踪的实时性要求. 实验表明该方法可靠，可为岩土微细结构连续变化特性研究提供实验手段.

Automatic Tracking of Soil Using Digital Image Correlation

In order to explore the dynamic evolution law of soil microstructures in real time, image correlation, matching template and search region adapted to the automatic tracking system are studied towards moving features of soil particles under loadings. It is vital to satisfy the real-time requirement and accuracy performance of the tracking system. By analyzing calculation time, kurtosis and statistical distribution of four types of correlation coefficients, we propose to use the square relation instead of the traditional cubic formula. The rectangular template and search region are used to replace the square template and search region to take advantage of the template's gray information and meet the real-time requirement. Experimental results show that the automatic tracking system is reliable, which provides an experimental means for the research of continuous deformation in the soil microstructure.