A PCA and ELM Based Adaptive Method for Channel Equalization in MFL Inspection

Table 2

PSNR of raw data and corrected data.

Index of flaw	PSNR of raw data	PSNR of median corrected data	PSNR of baseline estimation equalized data	PSNR of adaptive channel equalized data	flaw size (length width depth, unit mm)
1	16.8393	25.6999	26.0056	26.7182	40 × 20 × 1
2	18.6216	30.4281	31.0981	32.5947	6 perforation
3	19.0502	29.0965	29.2674	30.0454	8 perforation
4	18.5951	24.0668	24.1328	24.6181	20 × 40 × 4
5	17.5086	25.5968	25.8254	26.5034	40 × 20 × 4
6	16.8988	21.7448	22.9136	24.0683	20 × 20 × 2
7	16.4687	26.5349	26.8903	28.1939	40 × 20 × 2
8	17.5993	26.5228	26.8162	27.8077	20 × 40 × 2