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PoseAugment

The official code for our ECCV 2024 paper PoseAugment: Generative Human Pose Data Augmentation with Physical Plausibility for IMU-based Motion Capture. In this project, we will provide a detailed implementation of our method, including PoseAugment model training and evaluation. Readers are recommended to read the original paper first.

Before Started

PoseAugment is a light-weight data augmentation method for human poses. This project will provide three functionalities for users with different needs:

Choices 1 and 2 do not need to reproduce the baseline methods and their datasets. Readers with these two needs can skip the baseline part (marked as optional in the following instructions).

WARNING: this project involves multiple sub projects, and the code during developing are rapidly changing. A small part of the code may need you to modify manually to work normally. But do not worry, we simplied this procedure as simple as possible. You only need to search for # NOTE globally to locate them, and detailed instructions are provided in comments.

Environment

We run our project on MacOS Sonoma 14.2.1 (M1 Pro chip) and Ubuntu 20.04.6, with Python 3.9. We haven't tested it on Windows.

First, install the latest packages with pip:

pip install numpy torch opencv-python scipy matplotlib tqdm pandas aitviewer qpsolvers cvxopt quadprog clarabel proxsuite tensorboard

Then, you should install rbdl with python wrapper and urdf reader addon to use the physical optimization module. You can either add the final built rbdl-build dir to your system paths or just place it in the project root dir. We will add it to the system path before importing it. To build the python wrapper and urdf reader addon, you should turn on these two options in CMakeLists.txt:

OPTION (RBDL_BUILD_ADDON_URDFREADER "Build the (experimental) urdf reader" ON)
OPTION (RBDL_BUILD_PYTHON_WRAPPER "Build experimental python wrapper" ON)

Note: you should better make sure the Python compile version when building the rbdl module matches the runtime version, otherwise warnings like this may occur (but it won't cause any exceptions and runs normally in our experiments):

<frozen importlib._bootstrap>:228: RuntimeWarning: compile time Python version 3.8 of module 'rbdl' does not match runtime version 3.9

Prepare the Datasets

Prepare AMASS dataset

We use 18 datasets of the AMASS collection to train the VAE model. The datasets are the same with TransPose and be listed in config.py:General.amass. You should download the raw datasets from AMASS, and place them in data/dataset_raw/amass as specified in config.py:Paths.

Note: the dataset BioMotionLab_NTroje is BMLrub in AMASS, please refer to issue.

Prepare the DIP-IMU test dataset

This step is identical with TransPose, you can follow it or download the original DIP-IMU dataset (without normalization) from here. The raw dip dataset should be placed at data/dataset_raw/dip.

Prepare the SMPL body model

Download the SMPL body model from here. You should choose [Download version 1.0.0 for Python 2.7 (female/male. 10 shape PCs)], and copy the models from smpl/models into data/model, and change config.py:Paths.smpl_file to it accordingly. You can either use the male model or famale model.

(Optional) Prepare the SMPL-X model for visualization

We visualize the human poses using aitviewer. You should follow this instruction, download the SMPL-X model from here to configure the SMPL-X model for the aitviewer, and modify the model path in aitvconfig.yaml. The dir the path in aitvconfig.yaml point to should be look like this:

- smpl_model/
	- mano/
	- smpl/
	- smplh/
	- smplx/

Note that the SMPL-X model used for visualization is not exactly the same with the SMPL model used for generating poses.

Prepare the physical models

You can follow PIP to prepare physical models and place them in data/model to use the physical optimizer. The models include physics.urdf, plane.obj and plane.urdf. After that, check config.py:Paths.physics_model_file accordingly.

Preprocess the Dataset

We now have the AMASS and DIP raw datasets. To preprocess the datasets for model training, you need to follow preprocess.py to preprocess AMASS, DIP train, and DIP test datasets. This step will resample and align the data to 60 Hz, and synthesize the IMU data from raw pose datasets. The preprocessed data will be stored in data/dataset_work.

(Optional) Train the VAE Model

Note: this step is optional unless you would like to train the VAE model on your own datasets or tune it for your own purposes. Otherwise, you can simply use the released VAE model to augment your pose data.

The VAE model trained by ourselves is in data/model/mvae_weights.pt. If you want to train VAE yourself, please use train_mvae.py. The trained model will be placed in data/vae/<model_name>/best.pt.

Augment Pose Data

You can use augment.py to augment the pose and the corresponding IMU datasets using the trained PoseAugment model. The data augmentation process will use the pretrained VAE model and physical optimization in VAEOptimizer to optimize the generated poses. Change n_aug at the beginning of augment_data to modify the augmented data scale. The augmented data is cut to lengths <= 200 for training the MoCap models. The augmented datasets will be placed in data/dataset_aug.

We implemented augmenting AMASS, MotionAug, ACTOR, MDM-T2M, and MDM-M2M datasets. The last four are our baselines in the evaluation. We showcase the usage of PoseAugment in the augment_amass() function in augment.py. Readers can refer to the code for more details.

Till now, you can use PoseAugment to generate human pose data. You can stop now if you only want to use PoseAugment to augment your own data. In the following sections, we will walk you through the evaluation of PoseAugment in our work, including the comparison with baselines, and training TransPose model, which are all optional.

(Optional) Prepare Baseline Datasets

We compare our method with MotionAug, ACTOR, MDM-T2M, and MDM-M2M by training IMU-based motion capture models using these methods. For MotionAug, we directly use the released dataset. Please refer to preprocess_motionaug() and augment_motionaug() in augment.py. For ACTOR and MDM, we first cutomized their code to generate data. Please refer to actor/README.md and mdm/README.md for more details. After that, use preprocess_xxx() and augment_xxx() in augment.py to generate the datasets.

(Optional) Evaluation

After preparing the baseline datasets, we now have the training datasets for TransPose.

You can refer to train_transpose.py to run test_xxx() functions to test the data augmentation performance by training the TransPose model. In each training process, we will compare PoseAugment with Jitter, and the corresponding baseline method. We will train the models with different data augmentation scale (n_aug from 1 to 5) as described in the training details in the paper. The trained models will be placed in data/transpose.

After that, you should run evaluate_xxx() functions in evaluate_transpose.py. They will test the trained TransPose models on different datasets using DIP test data, and store the final results in data/analysis/.

Congrats! We have finished the evaluations by now.

(Optional) Visualization

We also provided a visualization demo in visualization.py, which is based on aitviewer. You can use it to visualized the augmented poses.