Research On Deformation Technology Of 3D Model Based On Contour And Depth Map

In recent years,3D models have been widely used,and related technologies derived from them have also attracted attention,but the source of all is still the acquisition of 3D geometric models.With the establishment and sharing of various models,coupled with the flexibility of the mesh model itself,it is easy to modify and adjust.Therefore,it is a new research direction to make full use of the existing model resources and obtain a new model that meets the specific application requirements through moderate deformation.In order to improve the utilization rate of existing models and get rid of the dependence on manual selection of control points in the existing three-dimensional model deformation technology,this paper studies the deformation technology of three-dimensional model based on contour and depth maps.The main work done in this paper is as follows:(1)Three-dimensional thin plate spline deformation.The change trend of control points before and after deformation in 3D model is analyzed.The constraint function in 3D model deformation is studied.The thin plate spline function used in image deformation is transferred to 3D model,and the 3D model of thin plate spline function constraint is designed.The deformation method,by optimizing the energy equation of the mesh surface and solving the coefficients of the mapping function,and then applying the coefficients to the other mesh vertices of the model,realizes the deformation of the three-dimensional model based on the thin-plate spline function.(2)Research on 3D model deformation technology based on single image.Aiming at the problem of relying on manual selection of control points in the deformation process,the extraction method of image feature points is analyzed,and the three-dimensional thin plate spline deformation method guided by contour is proposed,which realizes the automaticselection of control points and the reconstruction of picture objects.Firstly,a three-dimensional model similar to the image is retrieved and projected,and the contours of the input image and the projected image are extracted.Secondly,the feature point of the input image is detected as a target control point,and then according to the proportional relationship of the contour length,corresponding to the projected image The source control point;finally,the mesh vertex corresponding to the contour point is indexed on the three-dimensional model as the final control point,and the thin plate spline is deformed.(3)Research on 3D model deformation technology based on depth image driving.Aiming at the problem that the third-dimensional coordinate information is insufficient when the image is driven to deform,the depth image conversion point cloud and the point cloud feature point extraction and matching are deeply studied.The depth image-driven 3D model deformation method is proposed,and the depth map is realized.Three-dimensional reconstruction.Firstly,the symmetry point of the initial control point is determined by the symmetry detection method,the feature points of the depth image occlusion surface are complemented,the symmetry point is also detected for the target control point,and then the deformation control point of the entire model is determined,and the model is deformed using all the matching pairs with Thin plate spline.