Realistic Processing Of Face Organs And Its Application In The Craniofacial Recovery

Computer-aided craniofacial rehabilitation is a technology that recover the corresponding 3D face models based on unknown skulls. Because 3D face models which are generated by craniofacial recovery lack corresponding texture data, it affects the realistic result seriously. For these 3D face models, we propose the algorithms of 3D mesh segmentation, texture mapping, mesh deformation, and other technologies to realize the realistic processing of local organs of 3D human face. This research has an important theoretical and practical value. It mainly includes:(1) Propose a method through which we can do realistic processing respectively on the local organs of 3D human face. We should separate local organ models out from 3D human face firstly, and then use photos which are most similar to the local organ models to map, therefore, we realize the realistic processing of 3D human face.(2) We use an improved mesh segmentation algorithm based on random walk to realize the segmentation of the local organs. In order to determine the area of local organs more accurately and to facilitate user interaction, we propose another segmentation algorithm based on closed curves to segment 3D model surface.(3) Propose a method of texture mapping for local organs based on its shapes. Because it is impossible to get the textures of 3D face models which are generated by craniofacial recovery, we propose a classification criterion for eyes, nose and mouth by their shapes, then choose the most similar textures by the classification of the local organ models. We use cylindrical texture mapping algorithm to realize the texture mapping of local organs.(4) To solve the problem that eyes are closed in some craniofacial models, we propose an algorithm of 3D mesh deformation based on differential technology to lift the upper eyelid. After the deformation, there will be a hole between the upper and lower eyelids, so, we use Delaunay triangulation to fill this hole. The upper and lower eyelids are connected by the continuous triangular surfaces generated by Delaunay triangulation, and then we can simulate the eye fissure.(5) According to the demand of the realistic processing of local organs of 3D human face, we develop the realistic local organs of 3D human face processing system by Visual C++6.0 and OpenGL 3D graphics library for the virtual operation. It implements the relevant algorithms involved in this paper.