Application of Histogram Equalization for Image Enhancement in Corrosion Areas

Table 2

Information entropy indicators of image sets.

Enhanced method	Information entropy mean	Information entropy variance
Original image	5.9519	0.1883
Dark detail enhancement [24]	6.6281	0.0820
Defogging algorithm [17]	7.3701	0.0331
Homomorphic filtering [15]	6.8541	0.1929
Histogram [26]	7.5277	0.0313
Proposed algorithm	7.5281	0.0168