Table 1: PSNR values obtained with difference filters (template 3 × 3).

Noise levelPSNR(dB) for Lena/vegetables image
Noisy imageAverage filterMedian filterTV filterMNRATV

0.0513.73/13.6722.08/22.1523.66/23.5625.06/25.2625.47/26.04
0.1011.40/11.3919.71/19.7421.32/21.2522.48/22.4823.81/24.14
0.1510.25/102418.36/18.4619.85/19.8020.64/20.7422.64/22.92
0.209.54/9.5217.46/17.5018.78/18.6619.44/19.4021.74/21.78
0.259.05/9.0516.84/16.8717.96/17.8318.54/18.5621.05/21.12
0.308.69/8.6816.40/16.4917.29/17.1617.86/17.8520.46/20.51
0.358.42/8.4016.02/15.9816.67/16.6217.29/17.3319.93/20.02
0.408.19/8.2015.68/15.7116.24/16.4016.86/16.9019.56/19.62