短語詞組短語boundary surface extraction 邊界曲麪提取boundary point extraction 邊界処理Boundary Contour Extraction 邊界輪廓提取boundary feature extraction 邊界特征提取boundary characteristic extraction 邊界特征提取boundary information extraction 邊界信息提取urban boundary extraction 城市邊界提取building boundary extraction 建築輪廓線提取Abrasion boundary extraction 磨損邊界提取 返回 boundary extraction