面向实时逼真绘制的非传统相机模型研究

项目名称： 面向实时逼真绘制的非传统相机模型研究

项目编号： No.61272349

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 自动化技术、计算机技术

项目作者： 王莉莉

作者单位： 北京航空航天大学

项目金额： 80万元

中文摘要： 相机模型是三维场景绘制过程中的重要元素，它决定三维场景的投影方式和二维呈现结果。小孔相机模型能够近似模拟人眼观察的透视效果，且易于计算，一直在计算机图形学中得到广泛的使用，但是它仍然存在着一定的局限性，制约了一些复杂三维场景、现象的绘制算法的设计、效果和计算效率，因此近年来对于非小孔相机模型的研究备受关注。本课题针对小孔相机模型单一投影方式、平面均匀采样和视点单一等方面的限制，提出一系列更为复杂的相机计算模型，拟解决对于包含大量对象，而且对象可能具有多种材质属性、复杂遮挡关系等场景的逼真绘制还存在着无法用统一相机模型计算和投影绘制效率不高两方面的难点问题，研究内容具体包括基于像素聚类的复合相机模型、采样点累积相机模型和带状相机模型等，着重研究这些类相机的构造方法，光线投影方法和结果图像的重构绘制方法，并给出它们在三维图形实时逼真绘制中的应用示例。

中文关键词： 实时绘制；逼真绘制；相机模型；反射绘制；软阴影

英文摘要： Camera model is the important element during 3D scene drawing, and decides 3D scene's projection and 2D rendering effects. The pinhole camera model is popular used in computer graphics for simulating perspective effect of human eyes approximately and being computed easily, but it still has some limitations which affect the drawing effects and efficiency in some complex 3D scenes and phenomenon. So the research of non-pinhole camera models has attracted much more attention in recent years. According to the restrictions of pinhole camera model's single projection、plane uniform sampling and single viewpoint, we propose series of more complex camera models including the composite camera model based on pixel clustering、 the sample cumulation camera model and the ribbon camera model, etc. We mainly research on these kinds of models' construction、 projection and the result image reconstruction, and demonstrate their applications on real-time realistic rendering. To accelerate computation, all the approaches are investigated and designed in parallel to form an algorithm library, which is easily integrated in current 3D graphics rendering platform.

英文关键词： real-time rendering；photorealistic rendering；camera model；reflection；soft shadow