Iterated Second-Order Label Sensitive Pooling for 3D Human Pose Estimation
Catalin Ionescu, Joao Carreira and Cristian Sminchisescu


Recently, the emergence of Kinect systems has demonstrated the benefits of predicting an intermediate body part labeling for 3D human pose estimation, in conjunction with RGB-D imagery. The availability of depth information plays a critical role, so an important question is whether a similar representation can be developed with sufficient robustness in order to estimate 3D pose from RGB images. This paper provides evidence for a positive answer, by leveraging (a) 2D human body part labeling in images, (b) second-order label-sensitive pooling over dynamically computed regions resulting from a hierarchical decomposition of the body, and (c) iterative structured-output modeling to contextualize the process based on 3D pose estimates. For robustness and generalization, we take advantage of a recent large-scale 3D human motion capture dataset, Human3.6M[18] that also has human body part labeling annotations available with images. We provide extensive experimental studies where alternative intermediate representations are compared and report a substantial 33% error reduction over competitive discriminative baselines that regress 3D human pose against global HOG features.

Matlab code is available to reproduce the results in the article. The code is self-contained but data needs to be downloaded from the Human3.6M dataset.

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[90] Iterated Second-Order Label Sensitive Pooling for 3D Human Pose Estimation
C. Ionescu and Joao Carreira and C. Sminchisescu

IEEE Conference on Computer Vision and Pattern Recognition, 2014