A Multitarget Visual Attention Based Algorithm on Crack Detection of Industrial Explosives

Figure 6

Image preprocessing. Step  2: the first row shows the SE type of a diamond (scale 10); from left to right, the adjustment is 0.5, 1.5, and 2.0. The second row shows the SE type of a disk (scale 10); from left to right, the adjustment is 0.5, 1.5, and 2.0. The last row shows the SE type of a line, with scale of 45 and slope angle of 0.25π; from left to right, the adjustment is 1.0, 1.5, and 2.0.

(a) Brightness adjustment

(b) Histogram