Fig. 3
From: A multi-camera and multimodal dataset for posture and gait analysis

Transformations to spatially align the Xsens skeleton data from a world referential (left) to the walker’s posture camera referential (right). Transformations are shown in 3D space along with the 3D point cloud for reference. Once the skeleton is aligned in 3D space, it is possible to project it to the cameras’ referential.