Fig. 1. Structure of residual block

Fig. 2. Schematic diagram of channel attention mechanism

Fig. 3. Structure of our network

Fig. 4. Structure of residual channel attention block

Fig. 5. Reconstruction results of different algorithms. (a) Original images; (b) bicubic interpolation algorithm; (c) SRCNN algorithm; (d) ESPCN algorithm; (e) VDSR algorithm; (f) our algorithm

Fig. 6. PSNR curves of reconstructed mural image. (a) Buddha mural; (b) caisson mural

Fig. 7. Parameter amounts and training time of different reconstruction algorithms. (a) Parameter amount; (b) training time