Research Article
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 |
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