Interactive 3D video streaming [Guest Editorial]

Streaming of single-view video is now commonplace, so we expect to access any video content anywhere on any device. The delivery of 3D video streams, however, brings new technical challenges along with the promise of adding visual realism to the 3D scene by enhancing the perception of depth. The term "3D video" encompasses different types of video: · Stereoscopic video, with two slightly shifted video views for the observer\´s left and right eyes · Multiview video, where more than two video views are encoded for either an advanced multiview display terminal, or interactive applications where an observer can freely select any of the captured views for observation · Free viewpoint video, where geometric information of the 3D scene (e.g., depth maps) are transmitted along with multiview videos so that novel images can be synthesized at virtual viewpoints via depth-image-based rendering (DIBR)