1. Bad weather can significantly degrade visibility due to the presence of particles in the atmosphere that absorb and scatter light.
2. Existing methods for improving visibility in bad weather require multiple input images, which can be difficult to obtain in some situations.
3. The article introduces an automated method that only requires a single input image, based on observations that clear-day images have more contrast and airlight tends to be smooth. This method is applicable for both color and gray images and does not require geometrical information of the input image.