Fig. 1. Topological structure of neural network

Fig. 2. Distribution diagram of density function to be reconstructed

Fig. 3. Residual histograms of theoretical values and active terms estimated by different methods. (a) NNMM; (b) DCPD method

Fig. 4. Curve of estimated and theoretical values of active terms varying with x coordinates

Fig. 5. Residual distribution of density reconstruction results and theoretical values. (a) NNMM; (b) DCPD method

Fig. 6. Variation curve of reconstruction result. (a) Variation curve of residual with x coordinate; (b) variation curve of residual

Fig. 7. Video measurement optical path

Fig. 8. Experimental model and measurement area

Fig. 9. Measurement result of deflection angle

Fig. 10. Density reconstruction result of NNMM

Fig. 11. Density reconstruction result of DCPD method. (a) Result; (b) deviation of result from NNMM results

Fig. 12. Density reconstruction result by FEM. (a) Result; (b) deviation of result from NNMM results

Fig. 13. Curve comparison of density reconstruction results under different y values. (a) y=35 mm; (b) y=-10 mm