BoxCars Fine-Grained Recognition of Vehicles

This is Keras+Tensorflow re-implementation of our method for fine-grained classification of vehicles decribed in BoxCars: Improving Vehicle Fine-Grained Recognition using 3D Bounding Boxes in Traffic Surveillance (link). The numerical results are slightly different, but similar. This code is for research only purposes. If you use the code, please cite our paper:

@ARTICLE{Sochor2018, 
author={J. Sochor and J. Špaňhel and A. Herout}, 
journal={IEEE Transactions on Intelligent Transportation Systems}, 
title={BoxCars: Improving Fine-Grained Recognition of Vehicles Using 3-D Bounding Boxes in Traffic Surveillance}, 
year={2018}, 
volume={PP}, 
number={99}, 
pages={1-12}, 
doi={10.1109/TITS.2018.2799228}, 
ISSN={1524-9050}
}

Installation

• Clone the repository and cd to it.

git clone https://github.com/JakubSochor/BoxCars.git BoxCars
cd BoxCars

• (Optional, but recommended) Create virtual environment for this project - you can use virtualenvwrapper or following commands. IMPORTANT NOTE: this project is using Python3.

virtuenv -p /usr/bin/python3 boxcars_venv
source boxcars_venv/bin/activate

• Install required packages

pip3 install -r requirements.txt 

• Manually download dataset https://medusa.fit.vutbr.cz/traffic/data/BoxCars116k.zip and unzip it.
• Modify scripts/config.py and change BOXCARS_DATASET_ROOT to directory where is the unzipped dataset.
• (Optional) Download trained models using scripts/download_models.py. To download all models to default location (./models) run following command (or use -h for help):

python3 scripts/download_models.py --all

Usage

Fine-tuning of the Models

To fine-tune a model use scripts/train_eval.py (use -h for help). Example for ResNet50:

python3 scripts/train_eval.py --train-net ResNet50 

It is also possible to resume training using --resume argument for train_eval.py.

Evaluation

The model is evaluated when the training is finished, however it is possible to evaluate saved model by running:

python3 scripts/train_eval.py --eval path-to-model.h5

Trained models

We provide numerical results of models distributed with this code (use scripts/download_models.py). The processing time was measured on GTX1080 with CUDNN. The accuracy results are always shown as single image accuracy/whole track accuracy (in percents). We have also evaluated the method with estimated 3D bounding boxes (see paper for details) and included the results here. The estimated bounding boxes are in data/estimated_3DBB.pkl. In order to use the estimated bounding boxes, use --estimated-3DBB path-to-pkl argument for train_eval.py script. The models which were trained with the estimated bounding boxes have suffix _estimated3DBB.

Net	Original 3DBBs	Estimated 3DBBs	Image Processing Time
ResNet50	84.29/91.61	81.78/90.79	5.8ms
VGG16	84.10/92.09	81.43/90.68	5.4ms
VGG19	83.35/91.23	81.93/91.48	5.4ms
InceptionV3	81.51/89.86	79.89/89.92	6.1ms

BoxCars116k dataset

The dataset was created for the paper and it is possible to download it from our website The dataset contains 116k of images of vehicles with fine-grained labels taken from surveillance cameras under various viewpoints. See the paper BoxCars: Improving Vehicle Fine-Grained Recognition using 3D Bounding Boxes in Traffic Surveillance for more statistics and information about dataset acquisition. The dataset contains tracked vehicles with the same label and multiple images per track. The track is uniquely identified by its id vehicle_id, while each image is uniquely identified by vehicle_id and instance_id. It is possible to use class BoxCarsDataset from lib/boxcars_dataset.py for working with the dataset; however, for convenience, we describe the structure of the dataset also here. The dataset contains several files and folders:

• images - dataset images and masks
• atlas.pkl - BIG structure with jpeg encoded images, which can be convenient as the whole structure fits the memory and it is possible to get the images on the fly. To load the atlas (or any other pkl file), you can use function load_cache from lib/utils.py. To decode the image (in RGB channel order), use the following statement.

atlas = load_cache(path_to_atlas_file)
image = cv2.cvtColor(cv2.imdecode(atlas[vehicle_id][instance_id], 1), cv2.COLOR_BGR2RGB)

• dataset.pkl - contains dictionary with following fields

cameras: information about used cameras (vanishing points, principal point)
samples: list of vehicles (index correspons to vehicle id). 
		 The structure contains several fields which should understandable. 
		 It also contains field instances with list of of dictionaries 
		 with information about images of the vehicle track. 
		 The flag to_camera defines whether the vehicle is going towards camera or not. 

• classification_splits.pkl - different splits (hard, medium from paper and additional body and make split). Each split contains structure types_mapping definig mapping from textual labels to integer labels. It also contains fields train, test, and validation which are lists and each element contains tuple (vehicle_id, class_id).

• verification_splits.pkl - similar to classification splits; however, the elements in train, test are triplets (vehicle_id1, vehicle_id2, class_id).

• json_data and matlab_data - converted pkl file

Links

• BoxCars116k dataset
• Web with our Traffic Research