Skip to content
Switch branches/tags


A general python framework for visual object tracking and video object segmentation, based on PyTorch.

LWL and KYS released!


LWL, KYS, PrDiMP, DiMP and ATOM Trackers

Official implementation of the LWL (ECCV 2020), KYS (ECCV 2020), PrDiMP (CVPR 2020), DiMP (ICCV 2019), and ATOM (CVPR 2019) trackers, including complete training code and trained models.

Tracking Libraries

Libraries for implementing and evaluating visual trackers. It includes

  • All common tracking and video object segmentation datasets.
  • Scripts to analyse tracker performance and obtain standard performance scores.
  • General building blocks, including deep networks, optimization, feature extraction and utilities for correlation filter tracking.

Training Framework: LTR

LTR (Learning Tracking Representations) is a general framework for training your visual tracking networks. It is equipped with

  • All common training datasets for visual object tracking and segmentation.
  • Functions for data sampling, processing etc.
  • Network modules for visual tracking.
  • And much more...


The toolkit contains the implementation of the following trackers.


[Paper] [Raw results] [Models] [Training Code] [Tracker Code]

Official implementation of the LWL tracker. LWL is an end-to-end trainable video object segmentation architecture which captures the current target object information in a compact parametric model. It integrates a differentiable few-shot learner module, which predicts the target model parameters using the first frame annotation. The learner is designed to explicitly optimize an error between target model prediction and a ground truth label. LWL further learns the ground-truth labels used by the few-shot learner to train the target model. All modules in the architecture are trained end-to-end by maximizing segmentation accuracy on annotated VOS videos.

LWL overview figure


[Paper] [Raw results] [Models] [Training Code] [Tracker Code]

Official implementation of the KYS tracker. Unlike conventional frame-by-frame detection based tracking, KYS propagates valuable scene information through the sequence. This information is used to achieve an improved scene-aware target prediction in each frame. The scene information is represented using a dense set of localized state vectors. These state vectors are propagated through the sequence and combined with the appearance model output to localize the target. The network is learned to effectively utilize the scene information by directly maximizing tracking performance on video segments KYS overview figure


[Paper] [Raw results] [Models] [Training Code] [Tracker Code]

Official implementation of the PrDiMP tracker. This work proposes a general formulation for probabilistic regression, which is then applied to visual tracking in the DiMP framework. The network predicts the conditional probability density of the target state given an input image. The probability density is flexibly parametrized by the neural network itself. The regression network is trained by directly minimizing the Kullback-Leibler divergence.


[Paper] [Raw results] [Models] [Training Code] [Tracker Code]

Official implementation of the DiMP tracker. DiMP is an end-to-end tracking architecture, capable of fully exploiting both target and background appearance information for target model prediction. It is based on a target model prediction network, which is derived from a discriminative learning loss by applying an iterative optimization procedure. The model prediction network employs a steepest descent based methodology that computes an optimal step length in each iteration to provide fast convergence. The model predictor also includes an initializer network that efficiently provides an initial estimate of the model weights.

DiMP overview figure


[Paper] [Raw results] [Models] [Training Code] [Tracker Code]

Official implementation of the ATOM tracker. ATOM is based on (i) a target estimation module that is trained offline, and (ii) target classification module that is trained online. The target estimation module is trained to predict the intersection-over-union (IoU) overlap between the target and a bounding box estimate. The target classification module is learned online using dedicated optimization techniques to discriminate between the target object and background.

ATOM overview figure


[Paper] [Models] [Tracker Code]

An unofficial implementation of the ECO tracker. It is implemented based on an extensive and general library for complex operations and Fourier tools. The implementation differs from the version used in the original paper in a few important aspects.

  1. This implementation uses features from vgg-m layer 1 and resnet18 residual block 3.
  2. As in our later UPDT tracker, seperate filters are trained for shallow and deep features, and extensive data augmentation is employed in the first frame.
  3. The GMM memory module is not implemented, instead the raw projected samples are stored.

Please refer to the official implementation of ECO if you are looking to reproduce the results in the ECO paper or download the raw results.

Model Zoo

The tracker models trained using PyTracking, along with their results on standard tracking benchmarks are provided in the model zoo.


Clone the GIT repository.

git clone

Clone the submodules.

In the repository directory, run the commands:

git submodule update --init  

Install dependencies

Run the installation script to install all the dependencies. You need to provide the conda install path (e.g. ~/anaconda3) and the name for the created conda environment (here pytracking).

bash conda_install_path pytracking

This script will also download the default networks and set-up the environment.

Note: The install script has been tested on an Ubuntu 18.04 system. In case of issues, check the detailed installation instructions.

Windows: (NOT Recommended!) Check these installation instructions.

Let's test it!

Activate the conda environment and run the script pytracking/ to run ATOM using the webcam input.

conda activate pytracking
cd pytracking
python dimp dimp50    

What's next?

pytracking - for implementing your tracker

ltr - for training your tracker


Main Contributors

Guest Contributors