NTIRE 2019 Challenge on Image Colorization: Report

Gu S., Timofte R., Zhang R., Suin M., Purohit K., Rajagopalan A. N., ...More

32nd IEEE/CVF Conference on Computer Vision and Pattern Recognition (CVPR), California, United States Of America, 16 - 20 June 2019, pp.2233-2240 identifier identifier

  • Publication Type: Conference Paper / Full Text
  • Volume:
  • Doi Number: 10.1109/cvprw.2019.00276
  • City: California
  • Country: United States Of America
  • Page Numbers: pp.2233-2240
  • Istanbul Technical University Affiliated: Yes


This paper reviews the NTIRE challenge on image colorization (estimating color information from the corresponding gray image) with focus on proposed solutions and results. It is the first challenge of its kind. The challenge had 2 tracks. Track 1 takes a single gray image as input. In Track 2, in addition to the gray input image, some color seeds (randomly samples from the latent color image) are also provided for guiding the colorization process. The operators were learnable through provided pairs of gray and color training images. The tracks had 188 registered participants, and 8 teams competed in the final testing phase.