
Figure 1.
The gradient map and the adaptively truncating gradient map corresponding to the reference image and the distorted image. (a) the reference image. (b) the distorted image. (c) and (d) are the gradient map of (a) and (b), respectively. (e) and (f) are the adaptively truncating gradient map of (a) and (b), respectively.

Figure 2.
SROCC performance with different T0 values on six databases
TABLE I
COMPARISON THE PERFORMANCE RESULTS OF TEN IQA METRICS ON SIX PUBLIC DATABASES. THE FIRST TWO ARE MARKED IN BOLD
| Database | criteria | PSNR | SSIM (2004) | MS-SSIM (2003) | IFC (2005) | VIF (2006) | FSIM (2011) | GMSD (2014) | DASM (2017) | SSRM (2018) | Proposed |
|---|---|---|---|---|---|---|---|---|---|---|---|
| SROCC | 0.6396 | 0.7417 | 0.7859 | 0.5389 | 0.6769 | 0.8015 | 0.8038 | 0.8025 | 0.7500 | 0.8105 | |
| TID2013 | KROCC | 0.4698 | 0.5588 | 0.6047 | 0.3939 | 0.5147 | 0.6289 | 0.6334 | 0.6321 | 0.5718 | 0.6387 |
| PLCC | 0.7017 | 0.7895 | 0.8329 | 0.5538 | 0.7720 | 0.8589 | 0.8542 | 0.8574 | 0.8078 | 0.8601 | |
| RMSE | 0.8832 | 0.7608 | 0.6861 | 1.0322 | 0.7880 | 0.6349 | 0.6444 | 0.6547 | 0.7307 | 0.6324 | |
| SROCC | 0.5531 | 0.7749 | 0.8542 | 0.5675 | 0.7491 | 0.8805 | 0.8906 | - | 0.8332 | 0.8913 | |
| TID2008 | KROCC | 0.4027 | 0.5768 | 0.6568 | 0.4236 | 0.5860 | 0.6946 | 0.7090 | - | 0.6535 | 0.7042 |
| PLCC | 0.5734 | 0.7732 | 0.8451 | 0.7340 | 0.8090 | 0.8738 | 0.8786 | - | 0.8379 | 0.8745 | |
| RMSE | 1.0994 | 0.8511 | 0.7173 | 0.9113 | 0.7888 | 0.6525 | 0.6408 | - | 0.7324 | 0.6458 | |
| SROCC | 0.8756 | 0.9479 | 0.9513 | 0.9259 | 0.9636 | 0.9634 | 0.9546 | 0.9601 | 0.9608 | 0.9531 | |
| LIVE | KROCC | 0.6865 | 0.7963 | 0.8045 | 0.7579 | 0.8282 | 0.8337 | 0.8237 | 0.8218 | 0.8312 | 0.8211 |
| PLCC | 0.8721 | 0.9449 | 0.9430 | 0.9248 | 0.9598 | 0.9597 | 0.9515 | 0.9571 | 0.9695 | 0.9379 | |
| RMSE | 13.368 | 8.9455 | 9.0956 | 10.392 | 7.6734 | 7.6780 | 7.1131 | 7.7716 | 5.6639 | 8.0188 | |
| SROCC | 0.8058 | 0.8756 | 0.9133 | 0.7671 | 0.9195 | 0.9242 | 0.9571 | 0.9523 | 0.9369 | 0.9251 | |
| CSIQ | KROCC | 0.6084 | 0.6907 | 0.7393 | 0.5897 | 0.7537 | 0.7567 | 0.8122 | 0.8041 | 0.7791 | 0.7575 |
| PLCC | 0.8001 | 0.8613 | 0.8998 | 0.8381 | 0.9277 | 0.9120 | 0.9543 | 0.9531 | 0.9097 | 0.9055 | |
| RMSE | 0.1575 | 0.1334 | 0.1145 | 0.1432 | 0.0980 | 0.1077 | 0.0791 | 0.0799 | 0.1138 | 0.1114 | |
| SROCC | 0.6884 | 0.9018 | 0.8980 | 0.8993 | 0.8964 | 0.9262 | 0.8789 | 0.8966 | 0.9047 | 0.9103 | |
| IVC | KROCC | 0.5218 | 0.7223 | 0.7203 | 0.7202 | 0.7158 | 0.7564 | 0.6882 | 0.7179 | 0.7310 | 0.7352 |
| PLCC | 0.7199 | 0.9119 | 0.8934 | 0.9080 | 0.9028 | 0.9376 | 0.8549 | 0.9190 | 0.9132 | 0.9206 | |
| RMSE | 0.8456 | 0.4999 | 0.5474 | 0.5105 | 0.5239 | 0.4236 | 0.6320 | 0.5220 | 0.4965 | 0.4758 | |
| SROCC | 0.6189 | 0.8066 | 0.8394 | 0.3185 | 0.6223 | 0.9181 | 0.9103 | 0.9215 | 0.8527 | 0.9062 | |
| A57 | KROCC | 0.4309 | 0.6058 | 0.6478 | 0.2378 | 0.4589 | 0.7639 | 0.7513 | 0.7782 | 0.6604 | 0.7289 |
| PLCC | 0.6587 | 0.8017 | 0.8504 | 0.4548 | 0.6158 | 0.9252 | 0.9085 | 0.9429 | 0.8528 | 0.8530 | |
| RMSE | 0.1849 | 0.1469 | 0.1293 | 0.2189 | 0.1936 | 0.0933 | 01027 | 0.0813 | 0.0707 | 0.1283 |
TABLE II
COMPARISON SROCC FOR INDIVIDUAL DISTORTION OF TEN IQA METRICS ON TID2013 DATABASE. THE FIRS TTWO ARE MARKED IN BOLD
| Database | Distortion type | PSNR | SSIM (2004) | MS-SSIM (2003) | IFC (2005) | VIF (2006) | FSIM (2011) | GMSD (2014) | DASM (2017) | SSRM (2018) | Proposed |
|---|---|---|---|---|---|---|---|---|---|---|---|
| TID2013 | |||||||||||
| Awgn | 0.9291 | 0.8671 | 0.8646 | 0.6612 | 0.8994 | 0.8973 | 0.9461 | 0.9299 | 0.8545 | 0.9293 | |
| Awgn-color | 0.8986 | 0.7726 | 0.7730 | 0.5352 | 0.8299 | 0.8208 | 0.8689 | 08612 | 0.7757 | 0.8463 | |
| Spatial-correlated | 0.9197 | 0.8515 | 0.8544 | 0.6601 | 0.8835 | 0.8750 | 0.9348 | 0.9301 | 0.8392 | 0.9178 | |
| Mask-noise | 0.8321 | 0.7767 | 0.8073 | 0.6932 | 0.8450 | 0.7944 | 0.7085 | 0.8019 | 0.8184 | 0.8068 | |
| HF-noise | 0.9140 | 0.8634 | 0.8604 | 0.7406 | 0.8972 | 0.8984 | 0.9164 | 0.9179 | 0.8754 | 0.9069 | |
| Impulse-noise | 0.8969 | 0.7503 | 0.7629 | 0.6408 | 0.8537 | 0.8072 | 0.7633 | 0.8550 | 0.7872 | 0.8336 | |
| Quantization-noise | 0.8801 | 0.8657 | 0.8706 | 0.6282 | 0.7854 | 0.8719 | 0.9057 | 0.9032 | 0.8496 | 0.8629 | |
| GB | 0.9155 | 0.9668 | 0.9673 | 0.8907 | 0.9650 | 0.9551 | 0.9114 | 0.9546 | 0.9674 | 0.9686 | |
| Denoising | 0.9481 | 0.9254 | 0.9268 | 0.7779 | 0.8911 | 0.9302 | 0.9525 | 0.9496 | 0.9288 | 0.9361 | |
| JPEG | 0.9189 | 0.9200 | 0.9265 | 0.8357 | 0.9192 | 0.9324 | 0.9500 | 0.9473 | 0.9287 | 0.9515 | |
| JP2K | 0.8840 | 0.9468 | 0.9504 | 0.9078 | 0.9516 | 0.9577 | 0.9656 | 0.9620 | 0.9562 | 0.9635 | |
| JPEG-trans-error | 0.7682 | 0.8493 | 0.8475 | 0.7425 | 0.8409 | 0.8464 | 0.8401 | 0.8534 | 0.8369 | 0.8802 | |
| JP2K-trans-error | 0.8886 | 0.8828 | 0.8889 | 0.7769 | 0.8761 | 0.8913 | 0.9135 | 0.8966 | 0.8765 | 0.9141 | |
| Pattern-noise | 0.6864 | 0.7821 | 0.7968 | 0.5737 | 0.7720 | 0.7917 | 0.8143 | 0.8138 | 0.7745 | 0.7632 | |
| Block-distortion | 0.1552 | 0.5720 | 0.4801 | 0.2414 | 0.5306 | 0.5489 | 0.6630 | 0.6338 | 0.3186 | 0.6635 | |
| Mean-shift | 0.7671 | 0.7752 | 0.7906 | 0.5522 | 0.6276 | 0.7531 | 0.7356 | 0.6127 | 0.6919 | 0.6143 | |
| Contrast change | 0.4416 | 0.3775 | 0.4634 | -0.1798 | 0.8386 | 0.4686 | 0.3253 | 0.3498 | 0.4519 | 0.4889 | |
| Saturation change | 0.0944 | -0.4141 | -0.4099 | -0.4029 | -0.3099 | -0.2748 | -0.1907 | 0.0382 | -0.2513 | -0.2602 | |
| Multiple-noise | 0.8911 | 0.7803 | 0.7786 | 0.61423 | 0.8468 | 0.8469 | 0.8880 | 0.8814 | 0.8067 | 0.8698 | |
| Comfort-noise | 0.8410 | 0.8566 | 0.8528 | 0.81620 | 0.8946 | 0.9121 | 0.9298 | 0.9203 | 0.8921 | 0.9112 | |
| Noisy-compression | 0.9144 | 0.9057 | 0.9068 | 0.8180 | 0.9204 | 0.9466 | 0.9631 | 0.9402 | 0.9164 | 0.9367 | |
| Color quantization | 0.9269 | 0.8542 | 0.8555 | 0.6006 | 0.8414 | 0.8760 | 0.9098 | 0.9177 | 0.8546 | 0.8952 | |
| Chromatic abbr. | 0.8871 | 0.8775 | 0.8784 | 0.8210 | 0.8848 | 0.8715 | 0.8517 | 0.8693 | 0.8844 | 0.8849 | |
| Sparse sample | 0.9044 | 0.9461 | 0.9483 | 0.8885 | 0.9353 | 0.9565 | 0.9684 | 0.9669 | 0.9541 | 0.9601 |