Table 2 The PSNR comparison of the synthetic images corrupted by speckle 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 | 40.0128 | 40.1669 | 39.9244 | 37.6524 | 35.2580 | 33.4122 | 31.1031 |
SBF | 31.4337 | 28.1467 | 25.9877 | 22.9204 | 21.0456 | 18.9869 | 17.0807 |
Median | 28.8297 | 26.1794 | 24.2668 | 21.3757 | 19.4888 | 17.2021 | 14.7029 |
SRAD | 40.5927 | 35.3693 | 28.4001 | 20.6506 | 17.1747 | 14.0807 | 11.6757 |
NL-means | 28.6967 | 28.5895 | 28.4449 | 28.0558 | 27.8197 | 27.1815 | 25.5873 |
Lee | 35.0228 | 33.1100 | 31.9598 | 30.6620 | 30.0365 | 29.6552 | 29.0178 |
Kuan | 29.3561 | 28.0564 | 26.8034 | 24.7770 | 23.1643 | 21.1534 | 19.3770 |