Light Waving: Estimating Light Positions From Photographs Alone

We present an algorithm to automatically estimate three-dimensional light positions from an unordered set of images. We collect images using a single stationary camera while manually moving a light source around an object. Rather than measuring light positions directly, the algorithm extracts a threedimensional manifold of positions from the images using dimensionality reduction techniques. This obviates the need for calibration and specialized equipment, making our approach inexpensive, portable and applicable to objects of almost any size. We demonstrate our results using image-based relighting applications. Categories and Subject Descriptors (according to ACM CCS): I.3.7 [Computer Graphics]: ThreeDimensional Graphics and Realism I.2.0 [Artificial Intelligence]: Vision and Scene Understanding I.4.1 [Image Processing and Computer Vision]: Digitization and Image Capture

• Type: Journal
• Year: 2005
• Where: CGF
• Authors: Holger Winnemöller, Ankit Mohan, Jack Tumblin, Bruce Gooch
• Keywords: CGF 2005, Image, Light Positions, Three-dimensional Light Positions