Slope top/bottom line extraction system and method

The invention provides a slope top/bottom line extraction system and method, and the system comprises a data preprocessing unit which is used for carrying out the preprocessing of a pre-obtained mining area DEM image, so as to enable the processing of an edge extraction image of a gray image edge extraction unit not to be affected by the edge noise in the mining area DEM image; the grayscale image edge extraction unit is used for carrying out grayscale image edge extraction processing on the denoised DEM grayscale image of the mining area; and the slope top/bottom line extraction unit is used for extracting a slope top/bottom line from the mining area DEM gray level image subjected to gray level image edge extraction processing. According to the method, the mining area DEM image is segmented through the OTSU algorithm determined by the adaptive threshold, so that the gray values of the pixels are in one-to-one correspondence with the elevations, the mining area DEM gray image is divided into two parts, and th