Figure 2

The GGD of the. (a) horizontal detail subband $x_1^{\left(HL\right)}\left({\beta }_1^{\left(HL\right)}=1.07\right)$, (b): vertical detail subband $x_1^{\left(LH\right)}\left({\beta }_1^{\left(LH\right)}=1.14\right)$, (c): diagonal detail subband $x_1^{\left(HH\right)}\left({\beta }_1^{\left(HH\right)}=1.15\right)$. The detail coefficients of the "einst" image are optimized by minimizing their ℓ₂-norm.