How to convert night image to day image?
One problem with this is that dark images simply contain less information. Anyone with a background in photography will tell you it’s easier to decrease exposure on a bright image than increase exposure on a dark one (you can’t create what’s not there but you can throw away information you have). If you want all images on the same playing field, perhaps do the reverse. Or, try to extract only edges or high contrast regions from all images. Or, model them differently.