Fragments comparison and reassembly are necessary in art conservation or artifacts restoration.An approach to the problem of object reconstruction from broken fragments of arbitrary 3D objects is proposed in this paper.The triangle mesh model derived from the range data of fragment is preprocessed to remove some unwanted limitations

and then the fragment contour is extracted.The discrete points on the boundary curve are interpolated by quintic B-spline.With the spline curve

the curvature and torsion of every point are calculated and the geometric property is also analyzed.Feature points are detected based on the total curvature of every point

and the contour is segmented accordingly.The similarity between feature segments belonging to different contours is measured according to the variations of curvature and torsion

meanwhile the normal vector is utilized to verify the matchable probability of similar space curves.Thus

the Euclidean transformation of matching contours is computed to achieve the fragment reassembly.Experimental results demonstrate the approach is robust and efficient.