Fast Image Defogging Method Based on Dark Channel and Global Estimation

Fig. 4. Relationship between $I_{m i n}^{c} (x)$ and $J_{m i n}^{c} (x)$ . (a) Foggy image; (b) the fog component in the image is small; (c) the fog component in the image is large

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Fig. 5. Dehazing results of hazy images with abrupt change of depth of field and sky region by different methods. (a) Original foggy image; (b) DC-GF method; (c) Zhu's method; (d) Berman's method; (e) Cai's method; (f) Chen's method; (g) DC-GE method

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Table 1. Effective detail intensity, hue restoration degree, structural similarity and comprehensive evaluation of the obtained image

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Table 1. Effective detail intensity, hue restoration degree, structural similarity and comprehensive evaluation of the obtained image

Image	Method	Effective detail intensity	Hue restoration degree	Structural similarity	Comprehensive evaluation
Img 1	DC-GF	0.394	0.513	0.834	0.169
	Zhu	0.369	0.74	0.937	0.256
	Berman	0.267	0.781	0.84	0.175
	Cai	0.406	0.653	0.916	0.243
	Chen	0.376	0.818	0.897	0.276
	DC-GE	0.408	0.561	0.868	0.199
Img 2	DC-GF	0.664	0.608	0.568	0.229
	Zhu	0.652	0.532	0.703	0.244
	Berman	0.501	0.529	0.517	0.137
	Cai	0.653	0.597	0.654	0.255
	Chen	0.608	0.623	0.693	0.262
	DC-GE	0.667	0.612	0.609	0.249
Img 3	DC-GF	0.370	0.625	0.797	0.192
	Zhu	0.365	0.681	0.863	0.214
	Berman	0.306	0.661	0.781	0.158
	Cai	0.386	0.637	0.914	0.225
	Chen	0.357	0.771	0.957	0.263
	DC-GE	0.389	0.656	0.810	0.207
Img 4	DC-GF	0.583	0.543	0.689	0.218
	Zhu	0.510	0.54	0.791	0.218
	Berman	0.519	0.678	0.723	0.254
	Cai	0.502	0.36	0.838	0.151
	Chen	0.523	0.602	0.851	0.268
	DC-GE	0.516	0.86	0.847	0.376
Img 5	DC-GF	0.302	0.524	0.817	0.129
	Zhu	0.28	0.687	0.866	0.167
	Berman	0.271	0.65	0.696	0.123
	Cai	0.32	0.759	0.898	0.218
	Chen	0.358	0.542	0.879	0.171
	DC-GE	0.283	0.773	0.832	0.182
Img 6	DC-GF	0.483	0.61	0.706	0.208
	Zhu	0.569	0.844	0.685	0.329
	Berman	0.458	0.549	0.57	0.143
	Cai	0.469	0.583	0.844	0.231
	Chen	0.506	0.681	0.753	0.259
	DC-GE	0.472	0.651	0.765	0.235

Table 2. Processing time of the algorithm
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Table 2. Processing time of the algorithm
Images Img 1 Img 2 Img 3 Img 4 Img 5 Img 6
Method DC-GF DC-GE DC-GF DC-GE DC-GF DC-GE DC-GF DC-GE DC-GF DC-GE DC-GF DC-GE
Time /s 0.405 0.094 0.452 0.109 1.479 0.234 0.577 0.078 1.513 0.265 0.624 0.109

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Xianzhen Sang, Hongtai Zhu, Hu Cheng, Ye Zhang. Fast Image Defogging Method Based on Dark Channel and Global Estimation[J]. Laser & Optoelectronics Progress, 2022, 59(10): 1010006

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