Clarification on Hand Keypoint Ordering in OakInk2 (Missing Index Finger Joints?)

[aiming1998]

Hello, thank you for providing this dataset！
I have visualized the hand keypoints, but I noticed that for the left index finger there seem to be only two keypoints visible. In addition, the points corresponding to index 29 cannot be visualized in this episode. Could you please explain what might cause this issue?

I also found a reference for a 30-DOF hand joint naming convention, but it doesn’t seem to match the hand data format used in OakInk2. Could you provide the correct keypoint ordering for OakInk2?‘

 'left_index1', 
  'left_index2',
  'left_index3',
  'left_middle1',
  'left_middle2',
  'left_middle3',
  'left_pinky1',
  'left_pinky2',
  'left_pinky3',
  'left_ring1',
  'left_ring2',
  'left_ring3',
  'left_thumb1',
  'left_thumb2',
  'left_thumb3',
  'right_index1',
  'right_index2',
  'right_index3',
  'right_middle1',
  'right_middle2',
  'right_middle3',
  'right_pinky1',
  'right_pinky2',
  'right_pinky3',
  'right_ring1',
  'right_ring2',
  'right_ring3',
  'right_thumb1',
  'right_thumb2',
  'right_thumb3',

[kelvin34501]

Thank you for your interest in OakInk2 dataset!

OakInk2 uses SMPL-X and MANO parameters for annotation. For specific keypoint definitions and ordering, please refer to the SMPLXLayer and MANOLayer used in the project.

Note that both implementations are consistent with upstream keypoint definitions, where you can find the relevent documentation at here for smplx and here for manopth.

Hope this information helps!