This paper presents a novel approach to estimate the human pose from a body-scanned point cloud. To do so, a predefined skeleton model is first initialized according to both the skeleton base point and its torso limb obtained by Principal Component Analysis (PCA). Then, the body parts are iteratively clustered and the skeleton limb fitting is performed, based on Expectation Maximization (EM). The human pose is given by the location of each skeletal node in the fitted skeleton model. Experimental results show the ability of the method to estimate the human pose from multiple point cloud video sequences representing the external surface of a scanned human body; being robust, precise and handling large portions of missing data due to occlusions, acquisition hindrances or registration inaccuracies.

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This paper presents a novel approach to address the head pose estimation (HPE) problem in real world and demanding applications. We propose a new framework that combines the detection of facial landmarks with the tracking of salient features within the head region. That is, rigid facial landmarks are detected from a given face image, while at the same time, salient features are detected within the head region. The 3D coordinates of both set of features result from their intersection on a simple geometric head model (e.g., cylinder or ellipsoid). We then formulate the HPE problem as a perspective-n-point problem that we separately solve by minimizing the reprojection error of each 3D features set and their corresponding facial or salient features in the next face image. The resulting head pose estimations are then combined using Kalman Filter, which allows us to take advantage of the high accuracy when using facial landmarks while enabling us to handle extreme head poses by using salient features. Results are comparable to those from the related literature, with the advantage of being robust under real world situations that might not be covered in the evaluated datasets.

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