基于遥感影像的土地变化边缘提取

The Edge Extraction of Land Change Based on Remote Sensing Images

运用Sobel算子提取不同时期同一地区的遥感影像的轮廓，对提取后的影像用后期遥感影像减去对应的前期遥感影像相对应的相素，在相减时采用一个三阶算子，这样可以很好的消除不同时期影像匹配时的误差。并对相减后的影像采用一个的滤波方法算子进行滤波，可以很好的滤掉噪声。得到的影像能很好的反映出不同时期土地的变化边缘。

the outlines of remote sensing images that from the same area in different periods were extracted with Sobel operator.For the images extracted,we subtract the pixels of early-stage remote sensing images from that of late-stage remote sensing images, using the third order operator in the subtraction.This method can be good to eliminate the errors produced in different-period image matching. Through taking the filtering method designed by myself, the noise of images obtained after the subtraction can be well filtered off. And the ultimate images can be good to reflect the land edge changes of different periods.