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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 cur­ vature 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 conduc­ ted to calculate the new mesh vertex coordinates. Finally, based on the visual curvature, the curved contour line is ex­ tracted 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.

基于视觉曲率估算的文物线图绘制方法 (Drawing Method of Cultural Relics Line Drawing Based on Visual Curvature Estimation).