边缘检测技术在确定流体包裹体迹线中的应用  

DETERMINATION OF FLUID INCLUSION LINES USING EDGE-DETECTION TECHNIQUE

作　　者：徐金明[1] 赵晓波[1] 

机构地区：[1]上海大学土木工程系,上海200072

出　　处：《岩石力学与工程学报》2007年第6期1132-1137,共6页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金资助项目(40572162)

摘　　要：岩体裂隙中大量存在着流体包裹体,它们是流体包裹体迹面和流体包裹体迹线的组成成分。具有不同几何和形态参数的微观成分和显微构造记录岩体变形和破坏过程的重要信息。把冷热台中显微镜摄得的数字图像作为原始图像并转换成相应的灰度图像,采用四叉树分解和区域分割等方法把整个图像分解成多个子块,使用拐点与导数判定等方法检测流体包裹体,使用膨胀与腐蚀等数学形态学方法判定包裹体边界,经过重新定位后得到单个包裹体在整体坐标系中的位置信息,根据包裹体几何参数与最小二乘法获得了流体包裹体迹线及其形态和几何参数。这些处理过程均通过编制的应用程序在计算机中自动实现。由于流体包裹体迹线反映岩体中显微裂隙的一些特性、显微构造与宏观构造又具有一定的成生联系,因此,研究结果将为研究岩体地区各种地质现象变化过程的微观机制提供较好的理论基础。Fluid inclusions（FI）are widely spread in microcracks and composed of fluid inclusion planes（FIP） and fluid inclusion lines（FIL） -- the intersections of FIP with some observed planes. These microscopic compositions（FI） or structures（FIP and FIL） with different geometrical and configuration parameters may record the history of deformations and/or fractures in rocks. The original images are obtained from a camera on a heating-freezing stage. These images are first transformed into gray images and broken into blocks by image segmentations. For each block, the inflection point, derivative and color-based methods are all used to detect the edges for each fluid inclusion. The Roberts, Prewitt and Sobel algorithms are used in the inflection point. The LOG and Canny algorithms are used in the derivative method. In order to get better boundaries, the mathematical morphological analyses are used to extend edges, connect discontinuous points, fill pores in outlines, eliminate irrelative parts, smoothen projecting parts and aggregate the smaller inclusions into big ones. The inflation, erosion, seed-filling, boundary connection, smoothening methods are used in the mathematical morphological analysis. After re-orientation for each block, edge points and lines are ascertained in the global coordinate system. According to the geometrical properties of inclusions from edge detection, especially from the mathematical morphological analysis, FILs and their configuration parameters are finally obtained with the least square method. The geometrical properties include positions, areas and long-axis directions. The configuration parameters include length, and width. All of these procedures are coded into a program. Due to the reflection of FIL on the characteristics of microcracks and the formation relationships between the micro- and macro-structures, the analysis presented here may theoretically provide a good foundation to reveal the micromechanics of the change process for different geological phenomena in rock

关 键 词：岩石力学 流体包裹体 边缘检测 几何和形态参数 流体包裹体迹线 

分 类 号：TU45[建筑科学—岩土工程]