Fig. 1. Flowchart for solving coefficient vector βbest by TRR algorithm
Fig. 2. Schematic diagram of test specimen
Fig. 3. Fitted background image with 10th frame thermographic data of the original thermal image sequence
Fig. 4. Comparison graph of image data in line 195 before and after TRR algorithm processing
Fig. 5. Images of experimental results
Fig. 6. Results of defect segmentation
Coefficients | Values | a | 6 448 | b | 2.814 | c | 1.256 | d | 0.004 203 | e | −0.054 59 | f | −0.010 16 | g | −0.000 071 77 | h | 0.000 191 7 | i | 0.000 229 3 | j | −0.000 019 34 | k | −0.000 000 804 4 |
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Table 1. Background fitting function coefficients of the 10th frame infrared image