Research On Modelling By Interpolation And Its Visualization In 3D Reconstruction

The reconstruction of 3D sceneries from 2D images has been a hot research subject in image processing,digital photograph survey,and computerized vision. As part of the subject,3D reconstruction is an interdisciplinary project,which encompasses computer technology,computer graphics,image-processing technology,display technology and other high technologies. The development in computer software and hardware and the maturation of graphic & image technology will result in the bettering of 3D reconstruction and its broader application.The stereo-matching is to solve the problem of counterpoints in a pair of images. It is a key technology,because disparity can be obtained according to the principle of stereoscopic imaging if counterpoints of the pair of images are settled. On the basis of this,the in-depth information of a scene can be found out. Because of the overlapping of the scenes and the limitations of the stereo-matching algorithm,one can only get a few data points instead of the in-depth information of all points. Therefore,interpolation becomes a very important part in 3D modeling. On the basis of a comparative study of algorithm,the algorithm of Guass wavelet interpolation,which is based on Delaunay triangularion,is proposed in this thesis. This algorithm is characterized with simple calculation and good interpolating effect. Furthermore,unlike other algorithm,it is free of the definition of weight and estimation of parametersIn order to get a realistic image,it is necessary to do processing works,such as transform of plot,hidden-line elimination,illumination,texture mapping,to the 3D models constructed through interpolation. The transform of plot includes the translation,rotation,matching,zoom and the projection of the entire scene so that a better observation is made possible. With hidden-line elimination,ambiguity of graphic can be eliminated,which is important in getting a realistic scene. However,one cannot get a satisfactorily realistic image even when the scene is depleted of the hidden facets. Chapter 4 will be an introduction of the treatment of different lighting effects produced on the surface of an object,and of how to get a more realistic image by applying different shades of color,which determines the realistic effect of scenes and images. Images produced with methods mentioned above seem to be unrealistic as a result of thepolished and monotonous surface. To make the image realistic,surface minutia,i.e. the different texture,is to be added to the surface. An image can be finalized by adding the transformed 2D texture to the surface of a 3D object. Such an image is a realistic 3D scene.