研究背景,目标与内容(1) 1.项目的研究背景 虚拟现实(VR技术是信息领域的前沿,对 视觉建模和绘制的真实感和实时性有很高 的要求 计算机图形学面临的两大挑战:高度真实 感,实时性 IBMR(基于图像的建模和绘制)是1990年 代初提出的新兴研究方向,鲜明特点 具有高度真实感和较好的实时性 缺乏几何信息
二、研究背景，目标与内容(1) 1. 项目的研究背景 ➢ 虚拟现实(VR)技术是信息领域的前沿，对 视觉建模和绘制的真实感和实时性有很高 的要求 ➢ 计算机图形学面临的两大挑战：高度真实 感，实时性 ➢ IBMR（基于图像的建模和绘制）是1990年 代初提出的新兴研究方向，鲜明特点： ✓ 具有高度真实感和较好的实时性 ✓ 缺乏几何信息
、研究背景,目标与内容(2) Traditional Computer Graphics Input: Geometry, Material Properties( Color Reflectance,.etc.), Lighting Transformation and rasterization I Transform Rasterization→ ( lighting Computer Vision methods to recover models
二、研究背景，目标与内容(2) ⚫ Traditional Computer Graphics – Input: Geometry, Material Properties (Color, Reflectance,…etc.), Lighting. – Transformation and Rasterization. – Computer Vision methods to recover models. Transform (& Lighting) Rasterization
、研究背景,目标与内容(3) ● Top Level Survey 3D Graphics Sample-Based Geometry or Graphics Surface based Rendering modeling Image-Based Volume Rendering Rendering modeling
二、研究背景，目标与内容(3) ⚫ Top Level Survey 3D Graphics Image-Based Rendering & Modeling Geometry or Surface Based Rendering & Modeling Sample-Based Graphics Volume Rendering
、研究背景,目标与内容(4) Geometry-based versus image-based rendering conceptual world real world Image constructi on ffl acquisiti on geometry Images Image real-time analy sis image-based rendering ndering real-time interactive flythrough of scene o 1997 Marc Levoy
二、研究背景，目标与内容(4)
研究背景,目标与内容(5 ● Why ibr? Geometry IBR Modeling Difficult Easy Complexity #triangles eIs Fidelity Synthetic Acquired Problems of triangle-based graphics always starts from scratch Millions of sub-pixel triangles
二、研究背景，目标与内容(5) ⚫ Why IBR? – Problems of triangle-based graphics: ⚫ Always starts from scratch. ⚫ Millions of sub-pixel triangles. Geometry IBR Modeling Difficult Easy Complexity #triangles #pixels Fidelity Synthetic Acquired