Fig. 1. Block diagram of the improved-RL algorithm

Fig. 2. Structural diagram of the neutron imaging system

Fig. 3. Sketch of the rocking curve

Fig. 4. Photograph of the line-pair sample

Fig. 5. Neutron photographic image of line-pair sample, restored results and corresponding line grey profile (a) Original neutron photographic image, (b) RL algorithm, (c) Wavelet-RL, (d) SK-TV-RL, (e) Method in Ref.[12], (f) Our method, (g) Corresponding line grey profile of original neutron photographic image, (h) Corresponding line grey profile of RL algorithm, (i) Corresponding line grey profile of wavelet-RL, (j) Corresponding line grey profile of SK-TV-RL, (k) Corresponding line grey profile of method in Ref.[12], (l) Corresponding line grey profile of our method

Table 1. AGs and SFs of restored images based on the algorithm presented in Ref.[12] and improved-RL algorithm