Abstract: In order to solve the problem of the effective extraction of the feature lines of the three-dimensional model whose surface has noise,the reasons for the loss of texture details in the preprocessing stage was discussed and a new method of line drawing based on visual curvature estimation of the cultural relics was proposed.First, the discrete curvature on triangular mesh vertex is estimated and the cultural relic model is divided into the flat region and the non-flat region according to the curvature distribution.Then the sharpening filter on the vertex of the non-flat region is conducted to calculate the new mesh vertex coordinates.Finally,based on the visual curvature,the curved contour line is extracted to achieve automatic drawing of line drawing of cultural relics of the triangular mesh model.The experimental results show that the non-flat contour lines based on the visual curvature remains the details of the surface texture of the 3D model and avoid the sharp phenomena of the line drawing of the directed ridge line & valley line drawing.

Key words: Cultural relics,Line drawing,3D model,Visual curvature,Feature contour line