StarMap for Category-Agnostic Keypoint and Viewpoint Estimation

PyTorch implementation for category-agnostic keypoint and viewpoint estimation.

Xingyi Zhou, Arjun Karpur, Linjie Luo, Qixing Huang,
StarMap for Category-Agnostic Keypoint and Viewpoint Estimation
ECCV 2018 (arXiv:1803.09331)

Supplementary material with more qualitative results and higer resulution can be found here.

Contact: zhouxy2017@gmail.com. Any questions or discussions are welcomed!

Abstract

Previous methods for keypoints can only be applied to one specific category of fixed topology. As a result, this keypoint representation is not suitable when objects have a varying number of parts, e.g. chairs with varying number of legs. We propose a category-agnostic keypoint representation encoded with their 3D locations in the canonical object views. Our intuition is that the 3D locations of the keypoints in canonical object views contain rich semantic and compositional information. Our representation thus consists of a single channel, multi-peak heatmap (StarMap) for all the keypoints and their corresponding features as 3D locations in the canonical object view (CanViewFeature). Additionally, we show that when augmented with an additional depth channel (DepthMap) to lift the 2D keypoints to 3D, our representation can achieve state-of-the-art results in viewpoint estimation.

Installation

The code was tested with Anaconda Python 2.7 and PyTorch v0.1.12. After install Anaconda and Pytorch:

1. Clone the repo:

STARMAP_ROOT=/path/to/clone/StarMap
git clone https://github.com/xingyizhou/StarMap STARMAP_ROOT

2. Install dependencies (h5py, opencv, and progressbar):

conda install h5py
conda install --channel https://conda.anaconda.org/menpo opencv
conda install --channel https://conda.anaconda.org/auto progress

3. Optionally, install tensorboard for visializing training.

pip install tensorflow

Demo

• Download our pre-trained model (trained on Pascal3D+ dataset, or alternatively model trained on ObjectNet3D dataset) and move it to STARMAP_ROOT/models.
• Run

cd STARMAP_ROOT/tools
python demo.py -demo /path/to/image [-loadModel /path/to/model/] [-GPU 0]

The demo code runs in CPU by default.

We provide example images in STARMAP_ROOT/images/. The results are shown with predicted canonical view (triangle), the predicted 3D keypoints (cross), and the rotated keypoints with the estimated viewpoint (star). If setup correctly, the output will look like:

We also provide some custom images of novel categories in STARMAP_ROOT/images/. The expected results should be:

Setup Datasets

If you want to reproduce the results in the paper for benchmark evaluation and training, you will need to setup dataset.

1. Download and extract Pascal3D+ dataset (~7.5G).

cd STARMAP_ROOT/data
wget ftp://cs.stanford.edu/cs/cvgl/PASCAL3D+_release1.1.zip
unzip PASCAL3D+_release1.1.zip

2. Setup the path.

mv STARMAP_ROOT/lib/paths.py.examples STARMAP_ROOT/lib/paths.py

You can change the dataset path in STARMAP_ROOT/lib/paths.py in put the dataset elsewhere.

3. Convert the annotation.

cd STARMAP_ROOT/tools
python getPascal3DDataset.py

Optionally, setup the ObjectNet3D dataset (~7G) following the similar commands and run python getObjectNet3DDataset.py

Benchmark Evaluation

• Evaluate viewpoint estimation on Pascal3D+ (Table. 2 in the paper):

  • Download our pre-trained model on Pascal3D+ and move it to STARMAP_ROOT/models.

  • Run the network to get the feature predictions (Our result here).

cd STARMAP_ROOT/tools
python main.py -expID Pascal3D -task starembdep -loadModel ../models/Pascal3D-cpu.pth -test

• Align the predicted keypoints and the predicted features to solve viewpoint.

python EvalViewPoint.py ../exp/Pascal3DTEST/preds.pth

• The result should be:

  	aeroplane	bicycle	boat	bottle	bus	car	chair	diningtable	motorbike	sofa	train	tvmonitor	Mean
  Acc10	0.4982	0.3475	0.1466	0.5737	0.8896	0.6786	0.4549	0.2857	0.2794	0.4615	0.5929	0.3739	0.4851
  Acc30	0.8218	0.8559	0.5043	0.9243	0.9740	0.9156	0.7910	0.6190	0.8750	0.9231	0.7699	0.8288	0.8235
  Mid	10.05	14.50	29.42	9.02	3.02	6.29	11.13	23.66	14.23	10.97	7.41	13.14	10.38

• Evaluate keypoint classification on Pascal3D+ (Table. 1 in the paper):
  • Run

 cd STARMAP_ROOT/tools
 python EvalPTPCK.py ../exp/Pascal3DTEST/preds.pth

• The result should be:

  	aeroplane	bicycle	boat	bottle	bus	car	chair	diningtable	motorbike	sofa	train	tvmonitor	Mean
  Acc	0.7505	0.8343	0.5529	0.8718	0.9439	0.8984	0.7545	0.5802	0.6867	0.7901	0.5385	0.8610	0.7858

• Evaluate viewpoint evaluation on ObjectNet3D dataset. download our model, move it to STARMAP_ROOT/models, and run

cd STARMAP_ROOT/tools
python main.py -expID ObjectNet -dataset ObjectNet3D -task starembdep -loadModel ../models/ObjectNet3D-all-cpu.pth -test
python EvalViewPointObjectNet3D.py ../exp/ObjectNet3DTEST/preds.pth

Training

• Training viewpoint estimation.

cd STARMAP_ROOT/tools

1. Train the Starmap: log, model

python main.py -expID Pstar -task star

2. Train Starmap and CanviewFeature: log, model

python main.py -expID Pstaremb -task staremb -loadModel ../exp/Pstar/model_last.pth -dropLR 60

3. Train Starmap, CanviewFeature, and DepthMap: log, model

python main.py -expID Pstarembdep -task starembdep -loadModel ../exp/Pstaremb/model_last.pth -dropLR 60

• For training on ObjectNet3D dataset, add -dataset ObjectNet3D to the above commends (and of course, change the expID and loadModel path). And set -ObjectNet3DTrainAll to train on all objects (by default it leaves 20 categories for testing only).

• We also provide our implementation of the resnet baselines discussed in Table.2 following Viewpoint and Keypoint.

  • Category agnostic:

    python main.py -expID cls -task cls -arch resnet18 -trainBatch 32 -LR 0.01 -dropLR 20

  • Category specific:

    python main.py -expID clsSpec -task cls -arch resnet18 -trainBatch 32 -LR 0.01 -dropLR 20 -specificView

• For more training options, see lib/opts.py

Citation

@InProceedings{zhou2018starmap,
author = {Zhou, Xingyi and Karpur, Arjun and Luo, Linjie and Huang, Qixing},
title = {StarMap for Category-Agnostic Keypoint and Viewpoint Estimation},
journal={European Conference on Computer Vision (ECCV)},
year={2018}
}