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This paper presents Volumetric Transformer Pose estimator (VTP), the first 3Dvolumetric transformer framework for multi-view multi-person 3D human poseestimation. VTP aggregates features from 2D keypoints in all camera views anddirectly learns the spatial relationships in the 3D voxel space in anend-to-end fashion. The aggregated 3D features are passed through 3Dconvolutions before being flattened into sequential embeddings and fed into atransformer. A residual structure is designed to further improve theperformance. In addition, the sparse Sinkhorn attention is empowered to reducethe memory cost, which is a major bottleneck for volumetric representations,while also achieving excellent performance. The output of the transformer isagain concatenated with 3D convolutional features by a residual design. Theproposed VTP framework integrates the high performance of the transformer withvolumetric representations, which can be used as a good alternative to theconvolutional backbones. Experiments on the Shelf, Campus and CMU Panopticbenchmarks show promising results in terms of both Mean Per Joint PositionError (MPJPE) and Percentage of Correctly estimated Parts (PCP). Our code willbe available.

VTP: Volumetric Transformer for Multi-view Multi-person 3D Pose Estimation