Light waving
Holger Winnemöller, Ankit Mohan, Jack Tumblin, Bruce Gooch · 2005
Figure 1: Images are acquired with an uncalibrated camera while a handheld light is waved around the object. We use Isomap to reduce the dimensionality of input images to 3-D. The resulting co-ordinates are mapped onto the upper half of a sphere. Light positions and image samples can then be used for image-based relighting, in this case using a synthetic light-probe simulating opposing red and blue lights.