Fig. 1. Relationship between different parameters and depth of field. (a) Transmittance; (b) atmospheric light curtain

Fig. 2. Modification relationship between different parameters and depth of field. (a) Transmittance；(b) atmospheric light curtain

Fig. 3. Fog images under different conditions and performance curves. (a) Original image; (b) brightness；(c) saturation; (d) relationship among brightness, saturation, and gray scale

Fig. 4. Diagram of depth of field for color priori attenuation under different conditions. (a) Original images；(b) brightness; (c) saturation; (d) depth of field

Fig. 5. Comparison results under different depths of field. (a) Original images; (b) CAP algorithm；(c) depth of field d₀(x); (d) depth of field d₁(x); (e) final depth of field d(x)

Fig. 6. Correspondence between atmospheric light curtain and minimum color channel. (a) Original image；(b) minimum color channel; (c) atmospheric light curtain

Fig. 7. Correspondence between atmospheric light curtain and depth of field. (a) Original image; (b) minimum color channel；(c) variation curve of atmospheric light curtain with depth of field; (d) atmospheric light curtain

Fig. 8. Schematic of atmospheric light curtain estimation and restoration. (a) Degradation scenarios；(b) depth of field; (c) atmospheric light curtains; (d) scenes of restoration

Fig. 9. Atmospheric light curtain under different conditions. (a) Degradation scenarios; (b) local atmospheric light；(c) bright channel atmospheric light; (d) proposed algorithm

Fig. 10. Color restoration results of degraded scene in sand and dust weather. (a) Sand－dust scene; (b) correction of scenes

Fig. 11. Restoration results of degraded scene. (a) Degraded scene; (b) depth of field; (c) atmospheric light curtain；(d) restored scene

Fig. 12. Block diagram of proposed algorithm

Fig. 13. Restoration results of real fog images under different algorithms. (a) Degradation scenarios; (b) Ref. [1]；(c) Ref. [7]; (d) Ref. [4]; (e) Ref. [10]; (f) Ref. [14]; (g) Ref. [12]; (h) proposed algorithm

Fig. 14. Restoration results of sand and dust scene under different algorithms. (a) Degradation scenarios; (b) Ref. [1]；(c) Ref. [7]; (d) Ref. [4]; (e) Ref. [10]; (f) Ref. [14]; (g) Ref. [12]; (h) proposed algorithm

Fig. 15. Recovery results of RESIDE test set under different algorithms. (a) Composite fog chart; (b) Ref. [1]；(c) Ref. [7]; (d) Ref. [10]; (e) Ref. [14]; (f) Ref. [12]; (g) proposed algorithm; (h) real scenes