Fig. 1. Input-output fringes

Fig. 2. Architecture of denoising CNN

Fig. 3. Comparison of highlight areas determined by different methods. (a) Normal exposure time fringe pattern; (b) short exposure time fringe pattern; (c) modulation of Fig. 3(a); (d) modulation of Fig. 3(b); (e) result image of Fig. 3(a) using Otsu threshold method; (f) result image of Fig. 3(b) using Otsu threshold method

Fig. 4. Fusion process of iterative initial value

Fig. 5. Complete flow chart of fringe inpainting

Fig. 6. Results of inpainting. (a) Standard fringe pattern; (b) simulated fringe pattern with highlight region; (c) initial value of the iteration with Gaussian noise; (d) inpainting result of Ref. [19] method; (e) inpainting result of Ref. [20] method; (f) inpainting result of proposed method

Fig. 7. Experimental setup

Fig. 8. Comparison of inpainting results with different initial values. (a) Normal exposure time fringe pattern; (b) inpainting result of Fig. 8(a); (c) initial image-fused by proposed method; (d) inpainting result of Fig. 8(c)

Fig. 9. Fringe pattern inpainting results. (a) Original fringe pattern; (b) initial value for iteration; (c) inpainting result of Ref. [4] method; (d) inpainting result of Ref. [19] method; (e) inpainting result of Ref. [20] method; (f) inpainting result of proposed method

Fig. 10. Phase reconstruction results. (a) Result of Ref. [4] method; (b) result of Ref. [19] method; (c) result of Ref. [20] method; (d) result of iterative initial value; (e) result of proposed method

Fig. 11. Comparsion of gray distribution of fringe pattern under different exposure time. (a) Normal exposure time fringe pattern; (b) short exposure time fringe pattern; (c) inpainting result of proposed method; gray distribution of 170--370 columns in 256 row of (d) normal exposure time fringe pattern and (e) inpainting fringe pattern

Fig. 12. Comparison of reconstruction results. (a) Reconstruction result using normal exposure time fringe pattern; (b) reconstruction result using proposed method inpainting fringe pattern

Table 1. Comparison in execution time, PSNR, and RMSE of phase reconstruction with Ref. [19] method, Ref. [20] method, and proposed method