Papers › Beyond Weak Perspective for Monocular 3D Human Pose Estimation
Beyond Weak Perspective for Monocular 3D Human Pose Estimation
Imry Kissos, Lior Fritz, Matan Goldman, Omer Meir, Eduard Oks, Mark Kliger
We consider the task of 3D joints location and orientation prediction from a monocular video with the skinned multi-person linear (SMPL) model. We first infer 2D joints locations with an off-the-shelf pose estimation algorithm. We use the SPIN algorithm and estimate initial predictions of body pose, shape and camera parameters from a deep regression neural network. We then adhere to the SMPLify algorithm which receives those initial parameters, and optimizes them so that inferred 3D joints from the SMPL model would fit the 2D joints locations. This algorithm involves a projection step of 3D joints to the 2D image plane. The conventional approach is to follow weak perspective assumptions which use ad-hoc focal length. Through experimentation on the 3D Poses in the Wild (3DPW) dataset, we show that using full perspective projection, with the correct camera center and an approximated focal length, provides favorable results. Our algorithm has resulted in a winning entry for the 3DPW Challenge, reaching first place in joints orientation accuracy.
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Tasks
Results from the paper archive 2025-07-28
| Task | Dataset | Model | Metric | Value | Rank at snapshot | Leaderboard | Report |
|---|---|---|---|---|---|---|---|
| 3D Human Pose Estimation | 3D Poses in the Wild Challenge | BeyondWeak | MPJAE | 19.69 | #1 of 5 | Archive leaderboard | report |
| 3D Human Pose Estimation | 3D Poses in the Wild Challenge | BeyondWeak | MPJPE | 83.15 | #1 of 5 | Archive leaderboard | report |
| 3D Human Pose Estimation | 3DPW | BeyondWeak | MPJPE | 83.2 | #89 of 119 | Archive leaderboard | report |
| 3D Human Pose Estimation | 3DPW | BeyondWeak | PA-MPJPE | 59.7 | #89 of 119 | Archive leaderboard | report |
Ranks are positions in the archive's leaderboards as they stood at the 2025-07-28 snapshot. Results published since then are not among these rows, so a rank here is not a current standing.
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