作為自由曲線在圖像區域邊緣描述的應用，本文把區域邊界用這種自由曲線描述，并且通過描述曲線的曲率曲線，得到曲線的唯一性描述，從而作為曲線圍繞區域的特征，對區域的辨識也就轉為對特征的判斷。這種方法涉及到的數據量少，特征明確，有移不變性以及旋轉平移不變性，即使放大縮小也可以判斷，在圖形辨識方面有廣泛的應用價值。經過編程，結果很有效。
關鍵詞：曲率曲線；邊緣檢測；圖形匹配

Abstract：As the application of free curve in the district edge of images, this paper described the district edge with this kind of free curve. By describing the curvature curve, We get the unique describe, then recognizing of district is turned into judgment of characteristic as characteristic of surrounding the district. This method involves little measure, the characteristic is clear, there is the unchanged characteristic in moving and revolving. Because zooming can be judged there is the extensive application value in imaging’s recognizing. The result of program working is very valid.
Keywords：Curvature curve；Edge detection；Graph matching