Improved Dark Channel Defogging Algorithm for Defect Detection in Underwater Structures

Table 4

Standard deviation for the six sets of effect charts.

	Image 1	Image 2	Image 3	Image 4	Image 5	Image 6
Original image	11900	11600	13300	12700	13800	18000
D image (He)	12885	12675	14300	12995	14452	17752
Tarel image	32.49	35.25	33.50	32.74	33.24	33.00
Joost image	33.20	33.03	32.01	33.38	31.78	31.55
DR image	13000	12900	12700	14300	14500	18100