Overview Proposed Approach Experiments Compositional inference

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Deeply Learned Compositional Models for Human Pose Estimation Wei Tang, Pei Yu and Ying Wu Overview Proposed Approach Experiments Compositional inference Comparisons of PCKh@0.5 scores on the MPII testing set Motivations Spatially local information summarization (SLIS) There are problems with prior compositional models for human pose estimation Unrealistic assumptions on subpart-part relationships Exponentially large state spaces for higher-level parts Approximate inferences not well understood Child parts should not be far away from their parents → spatially local MAX and AVE poolings acted on score maps → information passing Contributions The first attempt to explicitly learn the hierarchical compositionality of visual patterns via CNNs A novel part representation to compactly encode the orientation, scale and shape of each part and avoid large state spaces A novel network architecture with a hierarchical compositional structure with bottom-up/top-down inference stages across multiple semantic levels Model compositional inference functions with CNNs Part sharing and higher-order potentials: z Network architecture Compositional structure: 3 semantic levels Parts sharing a common parent are connected to each other CNNs: hourglass modules Background: Compositional Models Bone-based part representation Embed type information into score maps State variables only denote locations Represent each part with its bones Gaussian kernels along part segments The score function of a basic compositional model