摘要：With the coming of information age and the development of computer science, digitalization of whole garment is becoming more and more important. The surface of whole garment is sequent and glossy so that it is lack of the texture characteristic which is the key of digital 3d modeling. According to this reason, the structure illumination is steered into a method of this paper. The paper proposes the method by which 3d model of whole garment is created from 2d image sequences directly but not by the common techniques using general CAd model. In the paper the structure illumination is generated by the slide projector and the modeling of whole garment is based on the strict theory of the digital photogrammetry, computer vision and image processing pattern recognition. Because whole garment is lack of the applicable texture for matching, the characteristic texture generated by the structure illumination is added onto the surface of whole garment. After the characteristic texture is extracted from images and is matched well, 3d coordinates of the characteristic texture can be calculated out by the space forward intersection. Then the whole garment model is acquired by connecting all neighhour space points in the TIN and rendering the real texture of whole garment automatically. The 3d modeling method is untouched so that it is nondestructive which is just suitable for the messaline and the clothing. The method of whole garment 3d modeling proposed in the paper is flexible, effective and practical, which is confirmed by the results of the reconstructing experiments.

摘要：We present a method for computed tomography(CT)image processing and modeling for tibia microstructure,achieved by using computer graphics and fractal *** the large-scale image data of tibia species with dICOM standard for clinical applications,we take advantage of algorithms such as image binarization,hot pixel removing and close operation to obtain visually clear image for tibia *** of these images are based on 20 CT scanning images with 30μm slice thickness and 30μm interval and continuous changes in *** each pore,we determine its profile by using an improved algorithm for edge ***,to calculate its three-dimensional fractal dimension,we measure the circumference perimeter and area of the pores of bone microstructure using a line fitting method based on the least ***,we put forward an algorithm for the pore profiles through ellipse *** results show that the pores have significant fractal characteristics because of the good linear correlation between the perimeter and the area parameters in log–log scale coordinates system,and the ratio of the elliptical short axis to the long axis through ellipse fitting tends to *** on support vector machine and structural risk minimization principle,we put forward a mapping database theory of structure parameters among the pores of CT images and fractal dimension,Poisson’s ratios,porosity and equivalent *** this basis,we put forward a new concept for 3d modeling called precision-measuring digital expressing to reconstruct tibia microstructure for human hard tissue.

摘要：A method to set up 3d collar prototype is developed in this paper by using the technique of cubic spline and bicubic surface patch. Then the relationship between the parameters of 3d collar prototype and different collar styles are studied. Based on the relationship, we can develop some algorithms of transferring style requirements to the parameters value of the collar prototype, and obtain some generation rules for the design of 3d collar style. As such, the knowledge base can be constructed, and the intelligent design system of 3d collar style is built. Using the system, various 3d collar styles can be designed automatically to satisfy various style requirements.

摘要：To improve the reusability of three-dimensional （3d） models and simplify the complexity of natural scene reconstruction, this paper presents a 3d model database for universal 3d GIS. After the introduction of its extensible function architecture, accompanied by the conclusion of implicit spatial-temporal hierarchy of models in any reconstructed scene of 3d GIS for general purpose, several key issues are discussed in detail, such as the storage and management of 3d models and related retrieval and load method, as well as the interfaces for further on-demand development. Finally, the validity and feasibility of this model database are proved through its application in the development of 3d visualization system of railway operation.

摘要：Because of its good condition with mechanics, logarithmic spiral double curve arch bam has been widely used in the practical engineering. The introduction of a new method in how to divide transverse joint in arch dam will be given and the further research of its calculation has been done. The C＋＋ is used in electronic procedure and the 3d simulation has been finished with AutoCAd, which will provide the object model for computer simulation of the arch dam and the division of finite element mesh. Meanwhile, this method in dividing the transverse joint in arch dam also can be taken as the calculated basis for the design and calculation of arch dam, construction lofting and the calculation of the work amount.