Table 5 The PSNR 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 | 37.1843 | 37.8060 | 37.7641 | 34.3361 | 31.7660 | 29.1620 | 26.9639 |
SBF | 31.3647 | 28.2465 | 26.0508 | 23.1560 | 21.2576 | 19.3698 | 17.2884 |
Median | 30.1799 | 27.0653 | 24.8715 | 20.8024 | 19.7203 | 17.5010 | 15.0511 |
SRAD | 35.0140 | 32.3199 | 27.3698 | 20.8410 | 17.4187 | 14.5701 | 12.0175 |
NL-means | 27.3287 | 27.2269 | 27.1580 | 26.8778 | 26.5577 | 26.3074 | 24.5780 |
Lee | 34.4946 | 32.7927 | 31.6582 | 30.5488 | 30.0358 | 26.7189 | 24.7268 |
Kuan | 36.1296 | 34.8856 | 33.1143 | 29.7408 | 28.5548 | 26.1472 | 24.8663 |