Fig. 1. Sample result of our proposed method，（a）original real hazy infrared image，（b）reconstructed image obtained by our technique

Fig. 2. The relationship between scattering efficiency and the ratio of the wavelength to the radius of scattered particles. As the particle radius increases，the scattering efficiency eventually converges about 2 after a slight oscillation

Fig. 3. The flowchart of the proposed algorithm

Fig. 4. Example of RAG in local region (a) A local region in fine segmented layer, (b) the corresponding RAG,(c) the next RAG after merge of P1 and P5 if the weight w is greater than wT

Fig. 5. Searching method to obtain A. Marked region is the next sub-block (a) process of modified quadtree method based on superpixels, (b) result and process of traditional quadtree method, (c) result of our method

Fig. 6. Relationship between transmission and reconstructed image. Haze is added to a block with t=0.6. Dehazing the artificial block with t is（a）0.3，（b）0.5，（c）0.7，（d）0.9，and the histogram distribution for each block.

Fig. 7. The input values of［0，65535］are mapped to the output with a small t. The information in the red region is lost because the values are truncated

Fig. 8. Visual comparisons in mutation scene (a) original image, (b) CLAHE, (c) MSR, (d) Bo et al., (e) Zheng et al.(f) proposed technique. The zoomed-in details are shown on the right side of the picture

Fig. 9. Visual comparisons in slowly-varying scene (a) original image, (b) CLAHE, (c) MSR, (d) Bo et al., (e) Zheng et al.,(f) proposed technique. The zoomed-in details are shown on the right side of the picture

Fig. 10. Example of comparison on pre-processing before CLAHE. (a) original infrared image,(b) Pre-processing image by bilateral filtering, (c) result of CLAHE in (a), (d) result of CLAHE in (b)