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[CVPR 2020] Instance-aware Image Colorization

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[Paper] [Project Website] [Google Colab]

Image colorization is inherently an ill-posed problem with multi-modal uncertainty. Previous methods leverage the deep neural network to map input grayscale images to plausible color outputs directly. Although these learning-based methods have shown impressive performance, they usually fail on the input images that contain multiple objects. The leading cause is that existing models perform learning and colorization on the entire image. In the absence of a clear figure-ground separation, these models cannot effectively locate and learn meaningful object-level semantics. In this paper, we propose a method for achieving instance-aware colorization. Our network architecture leverages an off-the-shelf object detector to obtain cropped object images and uses an instance colorization network to extract object-level features. We use a similar network to extract the full-image features and apply a fusion module to full object-level and image-level features to predict the final colors. Both colorization networks and fusion modules are learned from a large-scale dataset. Experimental results show that our work outperforms existing methods on different quality metrics and achieves state-of-the-art performance on image colorization.

Instance-aware Image Colorization
Jheng-Wei Su, Hung-Kuo Chu, and Jia-Bin Huang
In IEEE Conference on Computer Vision and Pattern Recognition (CVPR), 2020.


  • CUDA 10.1
  • Python3
  • Pytorch >= 1.5
  • Detectron2
  • OpenCV-Python
  • Pillow/scikit-image
  • Please refer to the env.yml for detail dependencies.

Getting Started

  1. Clone this repo:
git clone
cd InstColorization
  1. Install conda.
  2. Install all the dependencies
conda env create --file env.yml
  1. Switch to the conda environment
conda activate instacolorization
  1. Install other dependencies
sh scripts/

Pretrained Model

  1. Download it from google drive.
sh scripts/
  1. Now the pretrained models would place in checkpoints.

Instance Prediction

Please follow the command below to predict all the bounding boxes fo the images in example folder.

python --test_img_dir example

All the prediction results would save in example_bbox folder.

Colorize Images

Please follow the command below to colorize all the images in example foler.

python --name test_fusion --sample_p 1.0 --model fusion --fineSize 256 --test_img_dir example --results_img_dir results

All the colorized results would save in results folder.

Training the Model

Please follow this tutorial to train the colorization model.


This work is licensed under MIT License. See LICENSE for details.


If you find our code/models useful, please consider citing our paper:

  author = {Su, Jheng-Wei and Chu, Hung-Kuo and Huang, Jia-Bin},
  title = {Instance-aware Image Colorization},
  booktitle = {IEEE Conference on Computer Vision and Pattern Recognition (CVPR)},
  year = {2020}


Our code borrows heavily from the amazing colorization-pytorch repository.

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