As a bonus for fxinsider members, we have two full presentations from the CVMP conference. The first is some research by Paul Debevec’s ICT team into simplifying image-based lighting. The other is Jodri Bares covering new lighting techniques and pipelines being implemented at The Mill.
We’ll be rolling out more of these over the coming weeks…
Practical Image-Based Relighting and Editing with Spherical-Harmonics and Local Lights
Borom Tunwattanapong (University of Southern California), Abhijeet Ghosh (USC-ICT), Paul Debevec (USC-ICT)
Abstract
We present a practical technique for image-based relighting under environmental illumination which greatly reduces the number of required photographs compared to traditional techniques, while still achieving high quality editable relighting results. The proposed method employs an optimization procedure to combine spherical harmonics, a global lighting basis, with a set of local lights.
Our choice of lighting basis captures both low and high frequency components of typical surface reflectance functions while generating close approximations to the ground truth with an order of magnitude less data. This technique benefits the acquisition process by reducing the number of required photographs, while simplifying the modification of reflectance data and enabling artistic lighting edits for post-production effects. Here, we demonstrate two desirable lighting edits, modifying light intensity and angular width, employing the proposed lighting basis.
Lighting techniques for the 21st century
Jordi Bares, The Mill
A journey exploring current lighting techniques and future methods and their structural and logistical implications, from network and disk space to workflow limitations and render management. During the talk Bares proposes a change on practices that will leverage a different economic scenario along new workflow from scanning to delivery.
