Benefited from the advantages provided by depth sensors, 3D human pose estimation has become feasible. However, the current estimation systems usually yield poor results due to severe occlusion and sensor noise in depth data. In this paper, we focus on a post-process step, pose correction, which takes the initial estimated poses as the input and deliver more reliable results. Although the regression based correction approach has shown its effectiveness in decreasing the estimated errors, it cannot guarantee the regularity of corrected poses. To address this issue, we formulate pose correction as an optimization problem, which combines the output of the regression model with a pose prior model learned on a pre-captured motion data set. By considering the complexity and the geometric property of the pose data, the pose prior is estimated by von Mises-Fisher distributions in subspaces following divide-and-conquer strategies. By introducing the pose prior into our optimization framework, the regularity of the corrected poses is guaranteed. The experimental results on a challenging data set demonstrate that the proposed pose correction approach not only improves the accuracy, but also outputs more regular poses, compared to the-state-of-the-art.
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