Fei Gao, Xueyong Li, Shuo Zhang, Changhou Lu. Magneto-Optical Imaging Restoration Method for Damaged Characters with Orthogonal Excitation[J]. Laser & Optoelectronics Progress, 2023, 60(10): 1011003
- Laser & Optoelectronics Progress
- Vol. 60, Issue 10, 1011003 (2023)
Fig. 1. Magnetic field change at characters. (a) Character magnetic coupling model; (b) x-axis direction; (c) y-axis direction
Fig. 2. Principle of magneto-optical imaging
Fig. 3. Magnetic field distribution in the iron core
Fig. 4. Results of simulation. (a) Three-dimensional finite element model; (b) plot of magnetic induction field; (c) horizontal excitation; (d) vertical excitation
Fig. 5. Magneto-optical imaging recovery system for damaged characters
Fig. 6. Enhancement result of different algorithms. (a) LHE; (b) BPDHE; (c) CLAHE
Fig. 7. Grayscale curve obtained by different algorithms. (a) Grayscale value of horizontal excitation 220th row pixel; (b) grayscale value of vertical excitation 140th column pixel
Fig. 8. Magncto-optical imaging result of damaged characters. (a) Character E; (b) character F; (c) character H; (d) character D
Fig. 9. Result of different fusion algorithms. (a) Proposed method; (b) average weighting; (c) wavelet transform
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Table 1. Results of magneto-optical imaging appearances for different characters
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Table 2. Objective evaluation result of the three fusion algorithms
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