Table 3 Simulation data for the test image #13, noise model ( 1), PSNR metric

${\mathbf{\sigma }}_{\mathsf{si}}^{\mathbf{2}}$

MSE_inp

PSNR (δ _V  = -1, δ _k  = -1)

PSNR (δ _V  = -0, δ _k  = -0)

max_PSNR

δ _{V max}

δ _{k max}