Fig. 3From: Non-uniform illumination endoscopic imaging enhancement via anti-degraded model and L 1 L 2-based variational retinexFlowchart of the proposed algorithm. a Original image. b–d Dark channel, transmission map, and refined transmission map of (a). e Haze-free image of (a). f Naturalness component of (e). g Naturalness component with gamma correction. h Detail component of (e). i Reflectance component of (h). j Output imageBack to article page