\vspace{20pt}
\begin{table}[!htb]
\centering
\caption{Average results for  allowing the adaptive sampler to non uniformly allocate the sampling budget across time-frames.}
\label{tab:NU-ssim-psnr-nmse}
\resizebox{\textwidth}{!}{%
\begin{tabular}{ccccccccccc}
\hline
\multicolumn{2}{c}{\multirow{2}{*}{\textbf{Method}}} &
  \multicolumn{3}{c}{\textbf{$4 \times$}} &
  \multicolumn{3}{c}{\textbf{$6 \times$}} &
  \multicolumn{3}{c}{\textbf{$8 \times$}} \\ \cline{3-11} 
\multicolumn{2}{c}{} &
  SSIM &
  pSNR &
  NMSE &
  SSIM &
  pSNR &
  NMSE &
  SSIM &
  pSNR &
  NMSE \\ \hline
\multirow{2}{*}{\begin{tabular}[c]{@{}c@{}}Frame-specific\\ (1D)\end{tabular}} &
  Adpt-NU &
  0.9881 &
  46.32 &
  0.0031 &
  0.9833 &
  44.34 &
  0.0048 &
  0.9755 &
  41.91 &
  0.0085 \\
 &
  Adpt-NU-N1 &
  0.9873 &
  46.27 &
  0.0031 &
  0.9830 &
  {44.58} &
  {0.0047} &
  {0.9769} &
  {42.46} &
  {0.0075} \\ \hline

\end{tabular}%
}
\end{table}


