遥感图像的变化检测是对不同时间获取的同一区域 的两个或多个时相的遥感图像地物目标的变化情况进行检测,通过对两时相遥感图像的对比分析，获取该区域特定目标的变化信息。-The analysis of remotely sensed data for object extraction is a key step in an increasing number of GIS(Geographic Information Science) applications, in particular for

国内较新的列车车轮踏面擦伤图像检测算法，采用图像增强、图像分割、目标边缘提取等技术，通过自动搜索边缘获取缺陷径向、轴向、面积尺寸。 -A new image detection algorithm for wheel tread of train wheel in China is adopted, which is based on image enhancement, image segmentation and object edge extraction.