Table 1 The SNR 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 | 30.5639 | 28.2034 | 25.8091 | 23.9633 | 21.6541 | 18.3528 | 16.2720 |
SBF | 22.3715 | 19.0805 | 16.9216 | 13.8543 | 11.9803 | 9.9208 | 8.0415 |
Median | 19.7635 | 17.1132 | 15.2007 | 12.3096 | 10.4227 | 8.1360 | 5.6368 |
SRAD | 31.5266 | 26.3032 | 19.3339 | 11.5845 | 8.1085 | 5.0146 | 2.6095 |
NL-means | 19.6304 | 19.5233 | 19.3788 | 18.9897 | 18.7536 | 18.1153 | 16.0211 |
Lee | 20.3398 | 18.8931 | 17.5508 | 15.3167 | 14.0998 | 12.1313 | 10.306 |
Kuan | 24.9467 | 18.9903 | 17.7373 | 15.7109 | 14.0892 | 12.0872 | 10.3109 |