Development of a Dynamic Relighting System for Moving Planar Objects with Unknown Reflectance

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• 作者：Ryosuke Nakahata (16)
  Keta Hirai (16)
  Takahiko Horiuchi (16)
  Shoji Tominaga (16)
  
• 关键词：Relighting ; Spectral reflectance estimation ; Color reproduction ; Dynamic system ; Illuminant estimation
• 刊名：Lecture Notes in Computer Science
• 出版年：2015
• 出版时间：2015
• 年：2015
• 卷：9016
• 期：1
• 页码：81-90
• 全文大小：1,094 KB
• 参考文献：1. Wen, Z., Liu, Z., Huang, T.S.: Face relighting with radiance environment maps. In: Proc. CVPR, pp.158鈥?65 (2003)
  2. Debevec, P., Hawkins, T., Tchou, C., Duiker, H.-P., Sarokin, W., Sagar, M.: Acquiring the reflectance field of a human face. In: Proc. SIGGRAPH, pp.145鈥?56 (2000)
  3. Manakoy, A., Restrepo, J.F., Klehm, O., Hegedus, R., Eisemann, E., Seidel, H.-P., Ihrke, I.: A reconfigurable camera add-on for high dynamic range, multispectral, polarization, and light-field imaging. ACM Trans. Graph. 32(4) (2013); Proc. SIGGRAPH
  4. Park, J.-I., Lee, M.-H., Grossberg, M.D., Nayar, S.K.: Multi spectral imaging using multiplexed illumination. In: Proc. ICCV (2007)
  5. Tominaga, S., Nishioka, D., Horiuchi, T.: An integrated spectral imaging system for producing color images of static and moving objects. Color Research and Application (Early View, April 2014)
  6. Tominaga, S., Horiuchi, T.: Spectral Imaging by Synchronizing Capture and Illumination. JOSA A 29(9), 1764鈥?775 (2012) CrossRef
  
• 作者单位：Ryosuke Nakahata (16)
  Keta Hirai (16)
  Takahiko Horiuchi (16)
  Shoji Tominaga (16)
  
  16. Graduate School of Advanced Integration Science, Chiba University, Chiba, Japan
  
• 丛书名：Computational Color Imaging
• ISBN：978-3-319-15979-9
• 刊物类别：Computer Science
• 刊物主题：Artificial Intelligence and Robotics
  Computer Communication Networks
  Software Engineering
  Data Encryption
  Database Management
  Computation by Abstract Devices
  Algorithm Analysis and Problem Complexity
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1611-3349

文摘

Relighting is a technique to modify an image to account for alternate illumination conditions. Conventionally, the reflectance characteristics of an object are provided, and a relighted image is calculated using input light source information. In this paper, we propose a dynamic relighting system for moving planar objects with unknown reflectance. By acquiring the surface spectral reflectance of moving objects, our system is able to reproduce accurate colors on a display device. In the reflectance acquisition, we use a programmable light source that can produce any spectral curve. The surface spectral reflectance of an object in a darkroom is obtained based on the lighting technique with five spectral basis functions that are generated by the programmable light source. The acquired reflectance and user-input illumination information are used to calculate accurate CIEXYZ values of the relighted image. Finally, CIEXYZ values are accurately transformed to RGB values. In the experiment, illuminant A and D65 are used as the illuminants for relighting. As a result, by comparing a computer simulation with actual experiments with real objects, we observe an average color difference \( \Delta {\text{E}}^{*}_{\text{ab}} \) of approximately 7. This system operates at a rate of 1 frame per second. In addition, in this study, we have implemented another relighting system for objects under an environmental lighting condition by determining the spectral power distribution of the illumination source.