Table 4 The SNR comparison of the synthetic images corrupted by speckle and Gaussian noise under different noise levels (dB)
From: Rayleigh-maximum-likelihood bilateral filter for ultrasound image enhancement
Noise image | SNR = 15 dB | SNR = 12 dB | SNR = 10 dB | SNR = 7 dB | SNR = 5 dB | SNR = 3 dB | SNR = 1 dB |
|---|---|---|---|---|---|---|---|
Proposed | 27.7353 | 28.3570 | 28.3151 | 25.0501 | 21.7660 | 19.7310 | 17.5150 |
SBF | 21.9157 | 18.7967 | 16.6018 | 13.7071 | 11.8087 | 9.9209 | 7.8395 |
Median | 20.7309 | 17.6163 | 15.4225 | 11.3534 | 10.2713 | 8.0520 | 5.6002 |
SRAD | 25.5620 | 22.8780 | 17.9199 | 11.3920 | 7.9691 | 5.1211 | 2.5685 |
NL-means | 17.8788 | 17.7779 | 17.7091 | 17.4288 | 17.1081 | 16.8585 | 15.1291 |
LEE | 18.5462 | 18.2778 | 16.7909 | 15.1985 | 13.4685 | 12.1603 | 10.1315 |
Kuan | 23.5905 | 21.8682 | 19.6651 | 13.0058 | 8.8894 | 5.7629 | 3.2307 |