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README.md

English | 简体中文

MOT (Multi-Object Tracking)

Table of Contents

Introduction

The current mainstream multi-objective tracking (MOT) algorithm is mainly composed of two parts: detection and embedding. Detection aims to detect the potential targets in each frame of the video. Embedding assigns and updates the detected target to the corresponding track (named ReID task). According to the different implementation of these two parts, it can be divided into SDE series and JDE series algorithm.

  • SDE (Separate Detection and Embedding) is a kind of algorithm which completely separates Detection and Embedding. The most representative is DeepSORT algorithm. This design can make the system fit any kind of detectors without difference, and can be improved for each part separately. However, due to the series process, the speed is slow. Time-consuming is a great challenge in the construction of real-time MOT system.

  • JDE (Joint Detection and Embedding) is to learn detection and embedding simultaneously in a shared neural network, and set the loss function with a multi task learning approach. The representative algorithms are JDE and FairMOT. This design can achieve high-precision real-time MOT performance.

Paddledetection implements three MOT algorithms of these two series.

  • DeepSORT (Deep Cosine Metric Learning SORT) extends the original SORT (Simple Online and Realtime Tracking) algorithm, it adds a CNN model to extract features in image of human part bounded by a detector. It integrates appearance information based on a deep appearance descriptor, and assigns and updates the detected targets to the existing corresponding trajectories like ReID task. The detection bboxes result required by DeepSORT can be generated by any detection model, and then the saved detection result file can be loaded for tracking. Here we select the PCB + Pyramid ResNet101 model provided by PaddleClas as the ReID model.

  • JDE (Joint Detection and Embedding) learns the object detection task and appearance embedding task simutaneously in a shared neural network. And the detection results and the corresponding embeddings are also outputed at the same time. JDE original paper is based on an Anchor Base detector YOLOv3 , adding a new ReID branch to learn embeddings. The training process is constructed as a multi-task learning problem, taking into account both accuracy and speed.

  • FairMOT is based on an Anchor Free detector Centernet, which overcomes the problem of anchor and feature misalignment in anchor based detection framework. The fusion of deep and shallow features enables the detection and ReID tasks to obtain the required features respectively. It also uses low dimensional ReID features. FairMOT is a simple baseline composed of two homogeneous branches propose to predict the pixel level target score and ReID features. It achieves the fairness between the two tasks and obtains a higher level of real-time MOT performance.

Installation

Install all the related dependencies for MOT:

pip install lap sklearn motmetrics openpyxl cython_bbox
or
pip install -r requirements.txt

Notes:

  • Install cython_bbox for Windows: pip install -e git+https://github.com/samson-wang/cython_bbox.git#egg=cython-bbox. You can refer to this tutorial
  • Evaluation on Windows CUDA 11 environment may not be normally. It will be repaired as soon as possible. You can change to CUDA 10.2 or CUDA 10.1 environment for normal evaluation.

Model Zoo

DeepSORT on MOT-16 Training Set

backbone input shape MOTA IDF1 IDS FP FN FPS download config
ResNet-101 1088x608 72.2 60.5 998 8054 21644 - download config

DeepSORT on MOT-16 Test Set

backbone input shape MOTA IDF1 IDS FP FN FPS download config
ResNet-101 1088x608 64.1 53.0 1024 12457 51919 - download config

Notes: DeepSORT does not need to train on MOT dataset, only used for evaluation. Before DeepSORT evaluation, you should get detection results by a detection model first, and then prepare them like this:

det_results_dir
   |——————MOT16-02.txt
   |——————MOT16-04.txt
   |——————MOT16-05.txt
   |——————MOT16-09.txt
   |——————MOT16-10.txt
   |——————MOT16-11.txt
   |——————MOT16-13.txt

For MOT16 dataset, you can download the det_results_dir.zip of one detection model provided by PaddleDetection：

wget https://dataset.bj.bcebos.com/mot/det_results_dir.zip

Each txt is the detection result of all the pictures extracted from each video, and each line describes a bounding box with the following format:

[frame_id],[identity],[bb_left],[bb_top],[width],[height],[conf]

Notes:

  • frame_id is the frame number of the image
  • identity is the object id using default value -1
  • bb_left is the X coordinate of the left bound of the object box
  • bb_top is the Y coordinate of the upper bound of the object box
  • width,height is the pixel width and height
  • conf is the object score with default value 1 (the results had been filtered out according to the detection score threshold)

JDE on MOT-16 Training Set

backbone input shape MOTA IDF1 IDS FP FN FPS download config
DarkNet53 1088x608 72.0 66.9 1397 7274 22209 - model config
DarkNet53 864x480 69.1 64.7 1539 7544 25046 - model config
DarkNet53 576x320 63.7 64.4 1310 6782 31964 - model config

JDE on MOT-16 Test Set

backbone input shape MOTA IDF1 IDS FP FN FPS download config
DarkNet53(paper) 1088x608 64.4 55.8 1544 - - - - -
DarkNet53 1088x608 64.6 58.5 1864 10550 52088 - model config
DarkNet53(paper) 864x480 62.1 56.9 1608 - - - - -
DarkNet53 864x480 63.2 57.7 1966 10070 55081 - model config
DarkNet53 576x320 59.1 56.4 1911 10923 61789 - model config

Notes: JDE used 8 GPUs for training and mini-batch size as 4 on each GPU, and trained for 30 epoches.

FairMOT Results on MOT-16 Training Set

backbone input shape MOTA IDF1 IDS FP FN FPS download config
DLA-34(paper) 1088x608 83.3 81.9 544 3822 14095 - - -
DLA-34 1088x608 83.7 83.3 435 3829 13764 - model config

FairMOT Results on MOT-16 Test Set

backbone input shape MOTA IDF1 IDS FP FN FPS download config
DLA-34(paper) 1088x608 74.9 72.8 1074 - - 25.9 - -
DLA-34 1088x608 74.8 74.4 930 7038 37994 - model config

Notes: FairMOT used 8 GPUs for training and mini-batch size as 6 on each GPU, and trained for 30 epoches.

Dataset Preparation

MOT Dataset

PaddleDetection use the same training data as JDE and FairMOT. Please refer to PrepareMOTDataSet to download and prepare all the training data including Caltech Pedestrian, CityPersons, CUHK-SYSU, PRW, ETHZ, MOT17 and MOT16. The former six are used as the mixed dataset for training, and MOT16 are used as the evaluation dataset. In addition, you can use MOT15 and MOT20 for finetune. All pedestrians in these datasets have detection bbox labels and some have ID labels. If you want to use these datasets, please follow their licenses.

Data Format

These several relevant datasets have the following structure:

Caltech
   |——————images
   |        └——————00001.jpg
   |        |—————— ...
   |        └——————0000N.jpg
   └——————labels_with_ids
            └——————00001.txt
            |—————— ...
            └——————0000N.txt
MOT17
   |——————images
   |        └——————train
   |        └——————test
   └——————labels_with_ids
            └——————train

Annotations of these datasets are provided in a unified format. Every image has a corresponding annotation text. Given an image path, the annotation text path can be generated by replacing the string images with labels_with_ids and replacing .jpg with .txt.

In the annotation text, each line is describing a bounding box and has the following format:

[class] [identity] [x_center] [y_center] [width] [height]

Notes:

  • class should be 0. Only single-class multi-object tracking is supported now.
  • identity is an integer from 0 to num_identities - 1(num_identities is the total number of instances of objects in the dataset), or -1 if this box has no identity annotation.
  • [x_center] [y_center] [width] [height] are the center coordinates, width and height, note that they are normalized by the width/height of the image, so they are floating point numbers ranging from 0 to 1.

Dataset Directory

First, follow the command below to download the image_list.zip and unzip it in the dataset/mot directory:

wget https://dataset.bj.bcebos.com/mot/image_lists.zip

Then download and unzip each dataset, and the final directory is as follows:

dataset/mot
  |——————image_lists
            |——————caltech.10k.val  
            |——————caltech.all  
            |——————caltech.train  
            |——————caltech.val  
            |——————citypersons.train  
            |——————citypersons.val  
            |——————cuhksysu.train  
            |——————cuhksysu.val  
            |——————eth.train  
            |——————mot15.train  
            |——————mot16.train  
            |——————mot17.train  
            |——————mot20.train  
            |——————prw.train  
            |——————prw.val
  |——————Caltech
  |——————Cityscapes
  |——————CUHKSYSU
  |——————ETHZ
  |——————MOT15
  |——————MOT16
  |——————MOT17
  |——————MOT20
  |——————PRW

Getting Start

1. Training

Training FairMOT on 8 GPUs with following command

python -m paddle.distributed.launch --log_dir=./fairmot_dla34_30e_1088x608/ --gpus 0,1,2,3,4,5,6,7 tools/train.py -c configs/mot/fairmot/fairmot_dla34_30e_1088x608.yml

2. Evaluation

Evaluating the track performance of FairMOT on val dataset in single GPU with following commands:

# use weights released in PaddleDetection model zoo
CUDA_VISIBLE_DEVICES=0 python tools/eval_mot.py -c configs/mot/fairmot/fairmot_dla34_30e_1088x608.yml -o weights=https://paddledet.bj.bcebos.com/models/mot/fairmot_dla34_30e_1088x608.pdparams

# use saved checkpoint in training
CUDA_VISIBLE_DEVICES=0 python tools/eval_mot.py -c configs/mot/fairmot/fairmot_dla34_30e_1088x608.yml -o weights=output/fairmot_dla34_30e_1088x608/model_final.pdparams

Notes: The default evaluation dataset is MOT-16 Train Set. If you want to change the evaluation dataset, please refer to the following code and modify configs/datasets/mot.yml：

EvalMOTDataset:
  !MOTImageFolder
    task: MOT17_train
    dataset_dir: dataset/mot
    data_root: MOT17/images/train
    keep_ori_im: False # set True if save visualization images or video

3. Inference

Inference a vidoe on single GPU with following command:

# inference on video and save a video
CUDA_VISIBLE_DEVICES=0 python tools/infer_mot.py -c configs/mot/fairmot/fairmot_dla34_30e_1088x608.yml -o weights=https://paddledet.bj.bcebos.com/models/mot/fairmot_dla34_30e_1088x608.pdparams --video_file={your video name}.mp4  --save_videos

Notes: Please make sure that ffmpeg is installed first, on Linux(Ubuntu) platform you can directly install it by the following command:apt-get update && apt-get install -y ffmpeg.

Citations

@inproceedings{Wojke2017simple,
  title={Simple Online and Realtime Tracking with a Deep Association Metric},
  author={Wojke, Nicolai and Bewley, Alex and Paulus, Dietrich},
  booktitle={2017 IEEE International Conference on Image Processing (ICIP)},
  year={2017},
  pages={3645--3649},
  organization={IEEE},
  doi={10.1109/ICIP.2017.8296962}
}

@inproceedings{Wojke2018deep,
  title={Deep Cosine Metric Learning for Person Re-identification},
  author={Wojke, Nicolai and Bewley, Alex},
  booktitle={2018 IEEE Winter Conference on Applications of Computer Vision (WACV)},
  year={2018},
  pages={748--756},
  organization={IEEE},
  doi={10.1109/WACV.2018.00087}
}

@article{wang2019towards,
  title={Towards Real-Time Multi-Object Tracking},
  author={Wang, Zhongdao and Zheng, Liang and Liu, Yixuan and Wang, Shengjin},
  journal={arXiv preprint arXiv:1909.12605},
  year={2019}
}

@article{zhang2020fair,
  title={FairMOT: On the Fairness of Detection and Re-Identification in Multiple Object Tracking},
  author={Zhang, Yifu and Wang, Chunyu and Wang, Xinggang and Zeng, Wenjun and Liu, Wenyu},
  journal={arXiv preprint arXiv:2004.01888},
  year={2020}
}