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Image-based lighting in integration of computer-generated imagery and live-action for cinematic visual effects.

机译:基于图像的照明,结合了计算机生成的图像和真人电影动作的视觉效果。

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摘要

Image-based lighting (IBL), in the context of cinematic visual effects, significantly facilitates the integration of computer-generated imagery (CGI) and live action. Improved global-illumination sampling algorithms and ever-increasing machinery-computing speeds have encouraged the development of IBL techniques adopted by the industry for productions. The techniques have evolved from a conventional approach----consisting of a single environment map projected onto a mathematically infinite sphere to derive diffuse indirect illumination and reflections for computer-graphics (CG) objects----to a more elaborate lighting setup incorporating high dynamic range (HDR) imagery-based set reconstruction to drive both the direct and indirect illumination for addressing spatially aware lighting.;This study presents a systematic research dedicated to the field of IBL. It covers theoretical foundations of IBL-related disciplines and includes a review of real-world IBL practices with designed shots, featuring integration of CGI and live action. The review's purpose is to understand the benefits and limitations of various approaches of generating omnidirectional HDR environment maps in distinct lighting conditions. Additionally, the review examines rendering techniques of IBL for integrating CG objects into background plates of designed shots, in which each shot presents unique challenges in terms of matching the CG lighting to that present in the plates. At the end, the review leads to the proposal for an experimental workflow model that incorporates physically-based set reconstruction and pre-computation of a light-stage style data set. The proposed workflow model addresses issues discussed in the review and achieves interactive lighting design through the aid of image-based relighting. In addition, the proposed workflow model facilitates the process of lighting CG characters using HDR images of real-world lights to enhance the experiences of matching CG lighting to cinematic lighting created on a film set. Two examples are included to demonstrate the efficiency that the proposed workflow achieves and the limitations that current implementation causes.
机译:在电影视觉效果的背景下,基于图像的照明(IBL)极大地促进了计算机生成图像(CGI)和实景动作的集成。改进的全球照明采样算法和不断提高的机械计算速度鼓励了业界为产品所采用的IBL技术的发展。该技术已从传统方法演变为更复杂的照明设置,该方法包括将单个环境图投影到数学上无限的球体上以得出计算机图形(CG)对象的漫反射间接照明和反射。基于高动态范围(HDR)图像的集合重构,以驱动直接照明和间接照明,以解决空间感知照明问题。本研究提出了专门针对IBL领域的系统研究。它涵盖了IBL相关学科的理论基础,并通过设计镜头对现实世界中的IBL实践进行了回顾,并结合了CGI和现场表演。审查的目的是了解在不同的光照条件下生成全向HDR环境图的各种方法的优点和局限性。此外,本文还探讨了将CG对象整合到设计镜头的背景板中的IBL渲染技术,其中,在将CG照明与板中照明相匹配方面,每个镜头都面临着独特的挑战。最后,通过审查得出了关于实验工作流模型的建议,该模型包含了基于物理的集合重建和灯光阶段样式数据集的预计算。提出的工作流程模型解决了评论中讨论的问题,并通过基于图像的重新照明实现了交互式照明设计。此外,建议的工作流程模型有助于使用现实世界的HDR图像对CG角色进行照明,以增强将CG照明与电影胶片上创建的电影照明相匹配的体验。包括两个示例,以演示所提出的工作流程实现的效率以及当前实施方式造成的限制。

著录项

  • 作者

    Huang, Chih-Yuan.;

  • 作者单位

    The University of Texas at Dallas.;

  • 授予单位 The University of Texas at Dallas.;
  • 学科 Cinematography.;Engineering Computer.
  • 学位 Ph.D.
  • 年度 2011
  • 页码 170 p.
  • 总页数 170
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 康复医学;
  • 关键词

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