关键词: 膝关节腔体； 自动提取； 区域生长法； 孔洞修补

Abstract:

A method for automatically extracting the knee cavity model is presented. Test of intersection between normal and facets is utilized to distinguish the boundary facets of cavity, and these boundary facets are used as seeds to extract two inner cavity surfaces of the femur and tibia by region growing, and then the holes on the extracted surfaces are filled once the boundaries of the holes are automatically detected. Smoothing handle is also implemented to eliminate the jagged outline. At last, the cavity model of knee joint is created by suturing the two extracted surfaces.

Key words: knee cavity; automatic extraction; region growing; hole filling