An image processing method is used to obtain a boundary range. The method includes sampling an image from an inner side of an object capturing a first boundary curve from the image capturing a plurality of preliminary boundary curves from the image obtaining a first reference curve according to the preliminary boundary curves obtaining a thickness according to the first reference curve and the first boundary curve obtaining a plurality of candidate boundary curves by processing the preliminary boundary curves according to the first boundary curve and the thickness obtaining a second reference curve according to the candidate boundary curves selecting a set of nodes from the candidate boundary curves according to the second reference curve connecting the set of nodes to form a resultant boundary curve and defining the boundary range according to the first boundary curve and the resultant boundary curve.一種影像處理方法,用以求得一邊界範圍。該方法包含對一物體之內壁取樣一影像;從該影像擷取一第一邊界曲線;從該影像擷取複數個初始邊界曲線;根據該些初始邊界曲線求得一第一參考曲線;根據該第一參考曲線及該第一邊界曲線求得一厚度;根據該第一邊界曲線及該厚度處理該些初始邊界曲線以求得複數個候選邊界曲線;根據該些候選邊界曲線求得一第二參考曲線;根據該第二參考曲線從該些候選邊界曲線上選取一組節點;將該組節點相連以形成一結果邊界曲線;及根據該第一邊界曲線及該結果邊界曲線界定該邊界範圍。310至395‧‧‧步驟
