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Jeff-sjtu / HybrIK

Official code of "HybrIK: A Hybrid Analytical-Neural Inverse Kinematics Solution for 3D Human Pose and Shape Estimation", CVPR 2021
MIT License
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Relationship between cam_root, transl, cam_trans and cam_scale in pose_output #101

Open Tengoles opened 1 year ago

Tengoles commented 1 year ago

Hello! wanted to get some clarification on what is the relationship between the pose_output parameters mentioned in the title. I know they are all related with the world coordinates, camera coordinates and root position of the body but not sure exactly how.

Jeff-sjtu commented 1 year ago

Hi @Tengoles, camera_root is the root position in the camera coordinates. But the SMPL model will add a default offset to the root joint after both forward kinematics and inverse kinematics. Therefore, we use the term transl which considers the default offset. cam_trans and cam_scale are used for training. Following HMR, cam_trans is related to tx and ty, and cam_scale is the scale term.

nnop commented 5 days ago

the SMPL model will add a default offset to the root joint after both forward kinematics and inverse kinematics

Could you provide the line of this operation?