Why are the hand keypoints used from synth hands dataset in the form of a 22x3 array?

shalini-maiti

From what I know, the open pose network outputs 22x2, i.e 2d coordinates for each keypoint. Why does it use 3d coordinates from the hand keypoints from the synth hands?

Jane333

In the SynthHands dataset, the 3D positions are given in the depth camera space. For how to compute the 2D joint positions from these provided 3D positions, see the SynthHands FAQ here: [https://handtracker.mpi-inf.mpg.de/projects/OccludedHands/SynthHands.htm](url)