1、 本科毕业设计 英文文献及翻译 学院学院 班级班级 学号学号 姓名姓名 指指 导导 教教 师师 职职 称称 Concepts and Descriptions of 3D Models In the following, the concepts, descriptions and research directions for newly- developed digital media, 3D models, are presented. Based on three aspect of technical requirements, the basic concepts and the
2、commonly-used techniques for multimedia compression, multimedia watermarking, multimedia retrieval and multimedia perceptual hashing are then summarized. 3D Models A model is the abstract representation of an objective, including structures, attributes, variation laws and relationships among compone
3、nts.3D modelsare the fourth generation of multimedia following sound, images and videos. A 3D model represents a 3D object using a collection of points in the 3D space, connected by various geometric entities such as triangles, lines, curved surfaces, etc. A typical example is shown in Fig. 1.1. Bei
4、ng a collection of data (points and other information), 3D models can be created by hand, algorithmically (procedural modeling), or scanned. 3D models have been widely used anywhere in 3D graphics. Actually, their use predates the widespread use of 3D graphics on personal computers. Many computer ga
5、mes use pre-rendered images of 3D model as sprites before computers can render them in real-time. Today, 3D models are used in a wide variety of fields. The medical industry uses detailed models of organs. The movie industry uses them as characters and objects for animated and real-life motion pictu
6、res. The video game industry uses them as assets for computer and video games. The science sector uses them as highly detailed models of chemical compounds. The architecture industry uses them to demonstrate proposed buildings and landscapes through software architectural models. The engineering community uses them as designs of new devices, vehicles and structures, as well as for a host of other uses. In recent decades, the earth science community has started to construct 3D geological
