Fig. 1. Reference image and distorted images of varying degrees in TID2013 database. (a) Reference image; (b) distorted image (EMSE=76.54, RPSNR=29.29); (c) distorted image (EMSE=0.88, RPSNR=48.68)

Fig. 2. SROCC curves varying with r. (a) General mean pooling strategy 1; (b) general mean pooling strategy 2

Fig. 3. SROCC mesh graphs varying with ω. (a) Variation in SROCC of GM-C-SSIM2 with ω2 and ω3; (b) variation in SROCC of GM-C-GSSIM2 with ω2 and ω3; (c) variation in SROCC of GM-C-FSIM2 with ω1 and ω2

Fig. 4. Scatter plots between objective scores and MOS of each evaluation algorithm in TID2013 database. (a) C-SSIM; (b) C-GSSIM; (c) C-FSIM; (d) GM-C-SSIM1; (e) GM-C-GSSIM1; (f) GM-C-FSIM1; (g) GM-C-SSIM2; (h) GM-C-GSSIM2; (i) GM-C-FSIM2