Paul Debevec
Chloe LeGendre
ABSTRACT
We present a technique to reduce the dynamic range of an HDRI lighting environment map in an efficient, energy-preserving manner by spreading out the light of concentrated light sources. This allows us to display a reasonable approximation of the illumination of an HDRI map in a lighting reproduction system with limited dynamic range such as virtual production LED Stage. The technique identifies regions of the HDRI map above a given pixel threshold, dilates these regions until the average pixel value within each is below the threshold, and finally replaces each dilated region’s pixels with the region’s average pixel value. The new HDRI map contains the same energy as the original, spreads the light as little as possible, and avoids chromatic fringing.
- Paul Debevec, Andreas Wenger, Chris Tchou, Andrew Gardner, Jamie Waese, and Tim Hawkins. 2002. A Lighting Reproduction Approach to Live-Action Compositing. ACM Trans. Graph. 21, 3 (Jul 2002), 547–556. https://doi.org/10.1145/566654.566614Google Scholar
Digital Library
- Pierre-Loïc Hamon, James Harmer, Stuart Penn, and Nicolas Scapel. 2014. Gravity: Motion Control and Face Integration. In ACM SIGGRAPH 2014 Talks (Vancouver, Canada) (SIGGRAPH ’14). Association for Computing Machinery, New York, NY, USA, Article 35, 1 pages. https://doi.org/10.1145/2614106.2614193Google ScholarDigital Library
- Chloe LeGendre, Xueming Yu, Dai Liu, Jay Busch, Andrew Jones, Sumanta Pattanaik, and Paul Debevec. 2016. Practical Multispectral Lighting Reproduction. ACM Trans. Graph. 35, 4, Article 32 (Jul 2016), 11 pages. https://doi.org/10.1145/2897824.2925934Google ScholarDigital Library
Recommendations
Physically-based Environment and Area Lighting using Progressive Rendering in WebGL
Web3D '20: Proceedings of the 25th International Conference on 3D Web TechnologyThis paper presents a progressive rendering approach that enables rendering of static 3D scenes, lit by physically-based environment and area lights. Multi-frame sampling strategies are used to approximate elaborate lighting that is refined while ...
Tabletop Computed Lighting for Practical Digital Photography
We apply simplified image-based lighting methods to reduce the equipment, cost, time, and specialized skills required for high-quality photographic lighting of desktop-sized static objects such as museum artifacts. We place the object and a computer-...
Performance comparison of techniques for approximating image-based lighting by directional light sources
SCIA'07: Proceedings of the 15th Scandinavian conference on Image analysisImage-Based Lighting (IBL) has become a very popular approach in computer graphics. In essence IBL is based on capturing the illumination conditions in a scene in an omni-directional image, called a light probe image. Using the illumination information ...
Comments