Fig. 1. Schematic of fog degenerate model

Fig. 2. Flow chart of the proposed algorithm

Fig. 3. Schematic of sparse representation model

Fig. 4. Flow chart of parameter solution

Fig. 5. Initial refinement of the medium transmission image. (a) Rough medium transmission image td(x); (b) sample image tg(x); (c) reconstructed image; (d) preliminary optimized image t'd(x)

Fig. 6. Comparison of dehazing effects. (a) Haze image; dehazing effects of (b) Ref. [8-9], (c) Ref. [4], (d) Ref. [5], (e) Ref. [19], and (f) proposed algorithm

Fig. 7. Comparison of the sky regions dehazing effects. (a) Haze image; dehazing effects of (b) Ref. [8-9], (c) Ref. [19], (d) Ref. [20], and (e) proposed algorithms

Fig. 8. Comparison of the detail regions dehazing effects. (a) Haze image; dehazing effects of (b) Ref. [8-9], (c) Ref. [4], (d) Ref. [5], (e) Ref. [19], and (f) proposed algorithm