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Image-based remodeling: a framework for creating, visualizing, and editing image-based models.

机译：基于图像的重塑：用于创建，可视化和编辑基于图像的模型的框架。

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摘要

Image-based models are geometric models created from photographs and textured with the photographs for realistic rendering. In recent years, it has become increasingly easy to capture many photographs of an object and use computer vision techniques to model the object with image-based geometry. However, it can be difficult to display and interact with these models in a manner that reproduces the visual fidelity of the original photographs. It is even more difficult to support the interactive manipulation and editing that one might expect from other types of geometric models.;The overarching goal of this thesis is to create a framework for building, visualizing, and editing image-based models. Toward this goal, I first describe the related literature and outline the associated research challenges related to geometric representation, navigation, creation, and editing of image-based geometry.;One of the challenges in visualizing image-based geometry is discovering camera viewpoints and navigation paths that are both visually pleasing and enable story telling. To address this challenge, I describe a GPU-accelerated, image-based rendering algorithm that enables the creation of such visualizations in the form of camera paths and cinematic effects commonly used by cinematographers. In order to avoid objectionable rendering artifacts such as occlusion holes, the fast rendering algorithm is used to quickly sample the parameter space of camera viewpoints and define a viable region of camera parameters. This region is subsequently used to constrain an optimization for a camera path that maximizes parallax and conforms to cinematic conventions. This rendering algorithm also allows users to create more complex camera paths interactively, while experimenting with effects such as focal length, depth of field, and selective, depth-based desaturation or brightening.;A greater challenge is editing image-based geometry. To move image-based models away from the limitations of view-only geometry to the broader class of editable geometry, I describe a new approach for creating and visualizing editable image-based architectural models in a photorealistic manner. Using this approach, I present an interactive system that enables modeling, and remodeling of image-based geometry in the context of home interior architecture. This system supports creation of concise, parameterized, and constrained geometry, as well as remodeling directly from within the photographs. Real-time texturing of modified geometry is made possible by precomputing view-dependent textures for all of the faces that are potentially visible to each original camera viewpoint, blending multiple viewpoints and hole-filling where necessary. The resulting textures are stored and accessed efficiently, enabling intuitive, real-time, realistic visualization, modeling, and editing of the building interior.;Finally, I demonstrate how the image-based remodeling system enables lighting effects. Using a combination of the texture created in the image-based remodeling system and radiosity form-factor calculations, we estimate the irradiance at any location in the model. We can utilize this irradiance estimate to further refine light source estimates, and calculate surface reflectance properties. Given the additional estimates, edited models can be re-rendered to reflect lighting changes due to edited geometry, changing light properties, and the addition of synthetic objects.
机译：基于图像的模型是从照片创建并用照片进行纹理化以进行逼真的渲染的几何模型。近年来，捕获对象的许多照片并使用计算机视觉技术以基于图像的几何形状为对象建模变得越来越容易。但是，可能难以以再现原始照片的视觉保真度的方式显示这些模型并与之交互。要支持其他类型的几何模型可能期望的交互式操作和编辑，甚至会更加困难。；本文的总体目标是创建一个用于构建，可视化和编辑基于图像的模型的框架。为了实现这一目标，我首先描述了相关文献，并概述了与基于图像的几何图形的几何表示，导航，创建和编辑有关的相关研究挑战。可视化基于图像的几何图形的挑战之一是发现相机的视点和导航既美观又能讲述故事的路径。为了解决这一挑战，我描述了一种GPU加速的，基于图像的渲染算法，该算法能够以摄影机路径和电影摄影师通常使用的电影效果的形式创建这种可视化效果。为了避免令人讨厌的渲染伪影（例如遮挡孔），快速渲染算法用于快速采样相机视点的参数空间并定义相机参数的可行区域。该区域随后用于约束相机路径的优化，以使视差最大化并符合电影惯例。该渲染算法还允许用户交互地创建更复杂的相机路径，同时尝试诸如焦距，景深和选择性的基于深度的去饱和或增亮等效果。更大的挑战是编辑基于图像的几何图形。为了将基于图像的模型从仅查看几何的限制转移到更广泛的可编辑几何类别，我描述了一种以逼真的方式创建和可视化基于图像的可编辑建筑模型的新方法。通过这种方法，我提出了一个交互式系统，该系统可以在家庭内部建筑环境中对基于图像的几何进行建模和重塑。该系统支持创建简洁，参数化和受约束的几何图形，以及直接从照片内部进行重塑。通过为每个原始相机视点可能潜在可见的所有面部预先计算与视图相关的纹理，并在必要时混合多个视点和填充孔，可以实时修改纹理的纹理。可以有效地存储和访问生成的纹理，从而可以对建筑物内部进行直观，实时，逼真的可视化，建模和编辑。最后，我演示了基于图像的重塑系统如何实现照明效果。通过结合在基于图像的重塑系统中创建的纹理和辐射度形状因子计算，我们可以估算模型中任何位置的辐照度。我们可以利用此辐照度估算值进一步完善光源估算值，并计算表面反射率属性。给定额外的估算值，可以重新渲染已编辑的模型，以反映由于已编辑的几何形状，更改的灯光属性以及添加的合成对象而导致的光照变化。

著录项

  • 作者

    Colburn, R. Alex.;

  • 作者单位

    University of Washington.;

  • 授予单位 University of Washington.;
  • 学科 Computer Science.
  • 学位 Ph.D.
  • 年度 2014
  • 页码 144 p.
  • 总页数 144
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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