Fig. 1. Atmospheric scattering model

Fig. 2. Operation flow of mean comparison method of quarter dark channel method and corresponding result. (a) Quarter dark channel method; (b) the same position of original image

Fig. 3. Polarization images captured when polarizer rotates four fixed angles. (a) 0°; (b) 45°; (c) 90°; (d) 135°

Fig. 4. Output images at each stage in mist for scene 1.(a) I⊥; (b) I∥; (c) dehazing image obtained by single image dark channel method; (d) quarter dark channel process; (e) selection of A∞; (f) dehazing image

Fig. 5. Dehazing effect in mist for scene 2. (a) Synthetic original hazed image; (b) hazed image obtained by quarter dark channel mean comparison method; (c) hazed image obtained by single image dark channel method; (d)‒(f) local enlarged images of Figs. 5(a)‒5(c)

Fig. 6. Dehazing effect under dense haze for scene 3. (a) Synthetic dense haze image; (b) preliminary defogging effect; (c) dehazing local magnification; (d) corrected dehazing effect; (e) local amplification after correction; (f) single image dark channel dehazing

Fig. 7. Dehazing effect under dense haze for scene 4. (a) Image with haze; (b) dehazing image obtained by proposed method; (c) dehazing image obtained by single image dark channel method; (d)~(f) enlargement images of selected boxes in Figs. 7(a)‒(c)

Fig. 8. Comparison of image gray histograms before and after defogging. (a) Before dehazing of scene 1; (b) after dehazing of scene 1; (c) before dehazing of scene 3; (d) after dehazing of scene 3