MSANet: Mixed Spectral and Attention Network for Robust 3D Human Pose Estimation

Despite significant advances in 3D human pose estimation from a single-view video, existing methods often struggle to produce reasonable human poses when the human is heavily occluded or blurred. To address this issue, we propose a Mixed Spectral and Attention Network (MSANet) that stacks spectral and attention blocks alternately. The attention block captures visual cues before and after occlusions or blurs, while the spectral block perceives subtle localized occlusions or blurs for robust 3D human pose estimation. Specifically, our attention block captures the global information of intra-frame joints and enhances the coherent representation of inter-frame joints, the spectral block complements the intra- and inter-frame local occlusions information which is difficult to capture by the attention block. In addition, we improve the regression head (IRH) to narrow the grained gap between joint-level feature extraction and frame-level pose regression for smooth regression. With better temporal consistency and subtle localized occlusion awareness, our MSANet outperforms previous state-of-the-art methods on the commonly used benchmarks Human3.6M and MPI-INF-3DHP. Moreover, MSANet demonstrates broad real world applicability, realizing occlusions and blurs robust and accurate 3D pose estimation. The Code will be made public.