An improved image defogging algorithm based on global dark channel prior and fuzzy logic control

To overcome the weakness of original dark channel prior algorithm on losing effectiveness in bright regions, an adaptive defogging algorithm was proposed. In this method, the fuzzy logic controller was adopted to automatically estimate the threshold of bright regions and the adjustment factor of transmission, and the misestimated transmission in bright regions was corrected using the adaptive threshold. Experiment results show that the presented method can effectively eliminate the distortion in bright regions, and the visibility of defogging image can be significantly enhanced.