Figure 8

Examples of${\mathit{\sigma }}_{\mathit{m},\mathit{n}}^{\mathbf{SJR}}\mathbf{1}\le \mathit{m},\mathit{n}\le \mathbf{8}$, with different QF ₂ and ( x _S , y _S ). (a) An example image Lena. (b1) The quantization matrix for QF₂ = 90. (c1) The quantization matrix for QF₂ = 50. (b2, b3) Estimated ${\mathit{\sigma }}_{\mathit{m},\mathit{n}}^{\mathrm{SJR}}$ with QF₂ = 90, (x_S, y_S) = (4,4) and (1,6), respectively. (c2, c3) Estimated ${\mathit{\sigma }}_{\mathit{m},\mathit{n}}^{\mathrm{SJR}}$ with QF₂ = 50, (x_S, y_S) = (4,4) and (1,6), respectively.