Single-View Relighting with Normal Map Painting

This paper presents an interactive technique for changing the illumination of objects in a real photograph. 1 Because lighting effects are very sensitive to surface normal perturbations but hard to automatically analyze, we rely on a pen-based interface to quickly draw an approximate normal map over a photo. The photo and the approximate normal map are then given as input to a novel algorithm that refines the map and assigns reflectance to every pixel. We present relighting results for a variety of scenes, and use our technique to match the illumination of multiple pho-