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Noise variance estimation results on different test images.
| Test image | I | II | III | IV | V | VI | VII | VIII | Average error |
|---|---|---|---|---|---|---|---|---|---|
| σ = 4 | 4.125 | 4.027 | 4.039 | 4.031 | 3.945 | 4.042 | 3.994 | 4.028 | 0.044 |
| σ = 9 | 9.120 | 9.029 | 9.052 | 9.063 | 9.158 | 9.061 | 9.016 | 8.966 | 0.066 |
| σ = 16 | 15.901 | 16.057 | 16.101 | 16.112 | 15.867 | 16.073 | 16.026 | 16.059 | 0.082 |
