Algorithm 1 Structure of proposed scheme to estimate adaptive PSF

1:  Input: Initial matrix IMG1, IMG2

2:  Output: Complete matrix FSFσ 3:  FunctionInitialize (): 4:    Sigmaval = 0.01 to end (empirically); 5:    Preallocation (SSIMval, FSIMval); 6:  END 7:  Function Main (): 8:    For val = Sigmaval (start): Sigmaval (end) do 9:         PSFval $\leftarrow$ Input sigma in Equation (2) (val); 10:       IMG1_blur = IMG1 $\otimes \otimes$ PSFval; 11:       SSIMval (val) $\leftarrow$ Calculate the Equation (5) (IMG1_blur, IMG2); 12:       FSIMval (val) $\leftarrow$ Calculate the Equation (6) (IMG1_blur, IMG2); 13:    END For 14:    SSIMσ = find the index (max (SSIMval)); 15:    FSIMσ = find the index (max (FSIMval)); 16:    FSFσ = average (SSIMσ, FSIMσ); 17: Return FSFσ

18: END