Image dehazing is an ill-posed problem that has been extensively studied in the recent years. The objective performance evaluation of the dehazing methods is one of the major obstacles due to the lacking of a reference dataset. While the synthetic datasets have shown important limitations, the few realistic datasets introduced recently assume homogeneous haze over the entire scene. Since in many real cases haze is not uniformly distributed we introduce NH-HAZE, a non-homogeneous realistic dataset with pairs of real hazy and corresponding haze-free images. This is the first non-homogeneous image dehazing dataset and contains 55 outdoor scenes. The non-homogeneous haze has been introduced in the scene using a professional haze generator that imitates the real conditions of hazy scenes. Additionally, this work presents an objective assessment of several state- of-the-art single image dehazing methods that were evaluated using NH-HAZE dataset.
NTIRE is a CVPR workshop that aims to provide an overview of the new trends and advances in the areas of image restoration, enhancement and manipulation. Moreover, it offers an opportunity for academic and industrial attendees to interact and explore collaborations. The third image dehazing online challenge was organized jointly with the NTIRE 2020 workshop.