Multiple Light Source Estimation in a Single Image
Article first published online: 20 AUG 2013
© 2013 The Authors Computer Graphics Forum © 2013 The Eurographics Association and John Wiley & Sons Ltd.
Computer Graphics Forum
Volume 32, Issue 8, pages 170–182, December 2013
How to Cite
Lopez-Moreno, J., Garces, E., Hadap, S., Reinhard, E. and Gutierrez, D. (2013), Multiple Light Source Estimation in a Single Image. Computer Graphics Forum, 32: 170–182. doi: 10.1111/cgf.12195
- Issue published online: 27 NOV 2013
- Article first published online: 20 AUG 2013
- computational photography;
- image/video editing;
- light source estimation;
- I.4.8 [Image Processing and Computer Vision]: Scene Analysis—Photometry
Many high-level image processing tasks require an estimate of the positions, directions and relative intensities of the light sources that illuminated the depicted scene. In image-based rendering, augmented reality and computer vision, such tasks include matching image contents based on illumination, inserting rendered synthetic objects into a natural image, intrinsic images, shape from shading and image relighting. Yet, accurate and robust illumination estimation, particularly from a single image, is a highly ill-posed problem. In this paper, we present a new method to estimate the illumination in a single image as a combination of achromatic lights with their 3D directions and relative intensities. In contrast to previous methods, we base our azimuth angle estimation on curve fitting and recursive refinement of the number of light sources. Similarly, we present a novel surface normal approximation using an osculating arc for the estimation of zenith angles. By means of a new data set of ground-truth data and images, we demonstrate that our approach produces more robust and accurate results, and show its versatility through novel applications such as image compositing and analysis.