| 1. | Camera calibration is a critical step in computer vision , through which 3 - d information can be extracted from 2d images
摘要相机定标是计算机视觉中的关键步骤，通过相机定标可以从二维图象序列中获取物体的三维信息。 |
| 2. | A sprite is a texture mapped to a 2 - d surface . typically used for animation and billboarding , since multiple sprites can move within a larger image
子画面是一种映射到二维图面的纹理，通常用于动画和公告板，因为多个子画面可以在一个较大的图像内移动。 |
| 3. | 3d points are converted to images based on spherical polar coordinates , and point cloud surface information such as location , normal and color are stored in two - dimensional images
本文通过球面极坐标将点云曲面的几何信息及表面属性信息映射到二维图象中去。 |
| 4. | In recent years , autocad software has been generally used in drawing two - dimensional graphs in the design of traffic engineering structures such as ship and bridge
当前在交通工程结构物设计中，如船舶、桥梁设计等，一般都采用手工或autocad软件进行各部分的二维图绘制。 |
| 5. | According to the rules about orthographic projections , a method of 3d feature recognition is made , which recognizes 3dfeatures not only by 2d drawing elements but 3d solid
根据工程图的投影规则，制定出了基于二维工程图的三维立体特征识别的规则和过程，从体的角度，同时结合二维图元信息进行三维特征识别。 |
| 6. | However , two - dimensional graphs can not reflect the three - dimensional effect of the traffic engineering structures , which makes the design of traffic engineering structures have some drawbacks both in aesthetics and in practice
由于二维图不能反映结构物的立体效果，常常使设计出的结构物在美学、实用上存在一定的不足。 |
| 7. | The paper analyzes the framework about the data of dxf drawing , and gets the 2d drawing information , and sorts the drawing elements in order to recognize 3d features conveniently
通过对三视图的dxf图形数据的结构分析，获取了相关的二维图形信息，并按特征建模的要求对各视图的二维图元进行识别和分类，以利于三维特征的有效识别。 |
| 8. | Concerning the two - dimensional drafting , tools are developed to realize the products " overall searching , non - dimensional information ' s extraction from solid model , the statistics of part number and the filling of list table
采用catiav5com组件及接口技术，由二维图文档对象信息出发，通过对三维文档对象的遍历，完成三维实体模型非几何信息的提取、零件数量的统计等。 |
| 9. | The important features and capabilities of this cad system include , according to radical parameters of design , the design system can extract data from assigned database automatically , generate draw in autocad by using easy - use friendly interactive interface
该系统在给定基本参数条件下，通过人机交互，能够自动从软件中建立的数据库中提取数据，创建塔设备零部件二维图，并在autocad中生成图形。 |
| 10. | Modeling : this thesis develops a method different from traditional techniques that begins with the cylindrical projection of a generic model and its seamless global texture map using multiresolution technique , and then automatically fit the unwrapped cylindrical projected mesh to the texture map with an improved algorithm that based on 2d morphing to specify corresponding feature points ( or lines ) . finally , we propose a formula of inverse cylindrical projection to recompose the deformed mesh , and after the texture mapping a photo - realistic individual facial model is created
采用多分辨率技术构造纹理无缝拼接图，然后把三维网格模型投影到圆柱面上并展开，根据二维图象变形技术中特征点匹配算法的数学思想，将匹配公式进行改进后应用于模型网格点的适配，在作了一定假设后推导出逆向圆柱映射的计算公式，再将适配后的柱面网格映射回去，最后进行纹理映射生成真实感的特定人脸的三维模型。 |
