Synthesizing Realistic Shadows with Bumpy Surface and Object Model Estimated by Shadows in Single Image

摘要

Shadows play an important role in the human perception of 3D geometry in photographs, and properly synthesized shadows produce a realistic rendering result. Shadows, especially hard shadows, define powerful constraints between a light source, occluders, and the surfaces onto which shadows are cast. We aim to create a pseudo 3D scene in which the light produces shadows that are the same as those in the input image by taking the shadow constraints into account. Our method requires only a few user annotations and an input image, with the objects and their cast-shadows segmented in advance. The segmentation and the user annotations are used to create a shadow-free texture and a 3D scene, and users can then interactively edit the image by moving the objects and changing the lighting. Our system produces realistic shadows in real-time while enabling interactive editing.