“…The pose estimation is generally difficult due to unknown location of a human body in an image, unknown number of people in the scene, (self-) occlusions, a variety of environments [71,43,28] and actions [37,36] and diverse body shapes [7,41] and clothes [58]. Reconstruction of a 3D human pose from a single 2D image is particularly challenging due to 2D-to-3D elevation ambiguities [69,29,42,44,67,66,54,49]. To compensate for the lack of information in a single-view, multi-view [2,30,12,59,47] and multi-frame (video stream) [74,76,33,26,56] approaches to 3D human pose estimation have also been proposed.…”