TXT file in Human3.6m

[RuipengZhang118]

Hello, first of all, thank you very much for your open source code. I am a newcomer to research. Can you ask some questions? What is stored in each frame of each TXT file in Human3.6m? I am a bit confused about what is the mathematical meaning, why can I remove some data directly? thank you very much.

[una-dinosauria]

Hi @RuipengZhang118,

The file contains the Euler angle representation of a kinematic tree that represents the human body. With these transformations and a list of bone lengths, you can represent a pose and with a series you can represent motion.

If you are not familiar with kinematic trees, understanding this function

human-motion-prediction/src/forward_kinematics.py

Lines 14 to 28 in c9a2774

	def fkl( angles, parent, offset, rotInd, expmapInd ):
	"""
	Convert joint angles and bone lenghts into the 3d points of a person.
	Based on expmap2xyz.m, available at
	https://github.com/asheshjain399/RNNexp/blob/7fc5a53292dc0f232867beb66c3a9ef845d705cb/structural_rnn/CRFProblems/H3.6m/mhmublv/Motion/exp2xyz.m
	Args
	angles: 99-long vector with 3d position and 3d joint angles in expmap format
	parent: 32-long vector with parent-child relationships in the kinematic tree
	offset: 96-long vector with bone lenghts
	rotInd: 32-long list with indices into angles
	expmapInd: 32-long list with indices into expmap angles
	Returns
	xyz: 32x3 3d points that represent a person in 3d space
	"""

might be a good place to start.

Cheers,

[RuipengZhang118]

I already know that every third digit from the seventh to the 99th represents an axis-angle - the process of rigid body rotation, but what does the first six numbers mean? Also how to restore a skeleton that is visible to the naked eye?For example, intuitively use three numbers to represent key point coordinates. I didn't understand your visual code. I hope you can give me some more complete theoretical materials or videos. Thank you again. @una-dinosauria

[liwj812]

I already know that every third digit from the seventh to the 99th represents an axis-angle - the process of rigid body rotation, but what does the first six numbers mean? Also how to restore a skeleton that is visible to the naked eye?For example, intuitively use three numbers to represent key point coordinates. I didn't understand your visual code. I hope you can give me some more complete theoretical materials or videos. Thank you again. @una-dinosauria

Hi @RuipengZhang118 I have the same question right now,have you work out,need your help.

[RuipengZhang118]

I directly use the author's tools to generate the human skeleton.