The image we obtained in bad weather conditions is often significantly degraded by fog and mist. It greatly decreased the use of the image and make bad effect on the information processing in military, traffic, remote-sensing etc. As a result, the research on how to effectively process this kind of degraded images has very important meaning.First the degradation effect on the image by bad weather is presented, and the Oakley degradation model and the degradation model based on the atmosphere transfer functi...