Fig. 1. Flow chart of interference fringe processing

Fig. 2. Equalization processing of histogram. (a) Original image of interference fringe; (b) equalization result of histogram

Fig. 3. Preprocessing of interference image

Fig. 4. Hole-filling algorithm. (a) Original image; (b) complementary image; (c) image inverted by boundary point; (d) erosion image; (e) intersection of erosion image and complementary image; (f) filled hole image

Fig. 5. Effect diagram of hole-filling

Fig. 6. Template of Rosen algorithm

Fig. 7. Processing diagram of skeleton extraction algorithm

Fig. 8. Effect diagram of deburring

Fig. 9. Level calibration of interference fringes

Fig. 10. Processing resultby interference fringe detection algorithm. (a) Original image of interference fringe; (b) effect diagram of processing