Borom Tunwattanapong

Practical Image-Based Relighting and Editing with Spherical-Harmonics and Local Lights

Borom Tunwattanapong, Abhijeet Ghosh, Paul Debevec. Proceeding of the European Conference on Visual Media Production (CVMP) 2011. [paper][project][video]

      Lighting Environment                               Our Method                                  Ground Truth                                  Artistic Editing

                                                                  (20 lighting conditions)                (156 lighting conditions)

  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.