Foggy Image Enhancement Based on Adaptive Dynamic Range CLAHE

Fig. 4. Effect diagram of CLAHE algorithm before and after improvement. (a) Original image; (b) traditional CLAHE algorithm; (c) improved CLAHE algorithm

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Fig. 5. Flow chart of homomorphic filter enhancement

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Fig. 6. The processed results of various algorithms. (a) Original image; (b) HE; (c) CLAHE; (d) reference[25]; (e) reference[6]; (f) reference[8]; (g) proposed algorithm

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Fig. 7. Visual presentation of evaluation results. (a) Information entropy; (b) local contrast; (c) average gradient; (d) running time

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Table 1. Information entropy of different images processed by different algorithms

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Table 1. Information entropy of different images processed by different algorithms

Picture	Original	HE	CLAHE	Ref.［25］	Ref.［6］	Ref.［8］	Proposed algorithm
Village	6.36	6.29	6.93	6.92	7.23	6.96	6.91
Street	7.27	6.98	7.50	7.31	7.64	7.46	7.75
City	6.81	6.66	7.24	7.17	6.84	7.15	7.22
Crops	7.13	7.05	7.57	7.54	6.95	7.23	7.44
Outskirt	6.82	6.77	7.59	7.61	7.57	7.41	7.14

Table 2. Local contrast of different images processed by different algorithms

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Table 2. Local contrast of different images processed by different algorithms

Picture	Original	HE	CLAHE	Ref.［25］	Ref.［6］	Ref.［8］	Proposed algorithm
Village	0.06	0.29	0.17	0.13	0.25	0.15	0.22
Street	0.18	0.41	0.31	0.25	0.43	0.41	0.42
City	0.14	0.30	0.23	0.20	0.29	0.29	0.33
Crops	0.22	0.47	0.41	0.34	0.39	0.40	0.50
Outskirt	0.06	0.27	0.23	0.19	0.30	0.19	0.24

Table 3. Average gradient of different images processed by different algorithms

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Table 3. Average gradient of different images processed by different algorithms

Picture	Original	HE	CLAHE	Ref.［25］	Ref.［6］	Ref.［8］	Proposed algorithm
Village	10.85	33.70	48.70	39.36	35.56	34.87	62.91
Street	33.59	59.67	113.09	86.15	104.66	98.89	159.05
City	17.13	35.61	65.38	52.46	39.47	46.48	84.94
Crops	28.76	110.07	117.81	93.26	64.11	68.66	146.81
Outskirt	9.86	51.17	58.70	47.40	39.89	36.95	71.98

Table 4. Running time of different images processed by different algorithms

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Table 4. Running time of different images processed by different algorithms

Picture	Running time /s
Picture	HE	CLAHE	Ref.［25］	Ref.［6］	Ref.［8］	Proposed algorithm
Village	1.49	0.17	0.56	1.11	4.20	0.44
Street	1.23	0.10	0.35	0.48	2.27	0.41
City	1.39	0.16	0.44	1.26	3.10	0.39
Crops	0.80	0.16	0.23	0.98	4.76	0.54
Outskirt	0.84	0.14	0.29	0.87	2.30	0.45

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Danyang Fang, Qingqing Fu, Aiping Wu. Foggy Image Enhancement Based on Adaptive Dynamic Range CLAHE[J]. Laser & Optoelectronics Progress, 2023, 60(4): 0410008

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Paper Information

Category: Image Processing

Received: Oct. 29, 2021

Accepted: Dec. 21, 2021

Published Online: Feb. 14, 2023

The Author Email: Fu Qingqing (36820653@qq.com)

DOI:10.3788/LOP212835

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology