## 6 Experimental Results and Discussion
### Watermarked Image Quality  
Table 4 shows the results after the watermark embedding and the variation with and without the bit adjustment stage. It can be observed that the bit adjustment markedly raised the PSNR and SSIM values. Nonetheless, the best PSNR-HVS-M values fluctuated between both implementations.  
\begin{table}
\begin{tabular}{c c c c c c c} \hline \hline  & \multicolumn{4}{c}{**With Bit Adjustment**} & \multicolumn{4}{c}{**Without Bit Adjustment**} \\ \hline  & **PSNR** & **SSIM** & **PSNR-HVS** & **PSNR** & **SSIM** & **PSNR-HVS** \\ \hline Kodak-1 & 44.36 & 0.9923 & 52.49 & 43.93 & 0.9914 & 53.30 \\ Kodak-2 & 43.87 & 0.9787 & 49.02 & 43.44 & 0.9756 & 50.17 \\ Kodak-3 & 44.26 & 0.9762 & 48.02 & 43.81 & 0.9732 & 47.96 \\ Kodak-4 & 44.30 & 0.9819 & 49.73 & 43.90 & 0.9798 & 50.05 \\ Kodak-5 & 44.20 & 0.9922 & 50.89 & 43.83 & 0.9914 & 52.12 \\ Kodak-6 & 44.41 & 0.9874 & 49.10 & 43.92 & 0.9859 & 48.82 \\ Kodak-7 & 44.31 & 0.9817 & 48.99 & 43.92 & 0.9797 & 49.10 \\ Kodak-8 & 44.41 & 0.9934 & 52.16 & 43.94 & 0.9925 & 52.50 \\ Kodak-9 & 44.47 & 0.9790 & 49.10 & 44.02 & 0.9764 & 48.94 \\ Kodak-10 & 44.45 & 0.9806 & 49.90 & 43.97 & 0.9783 & 49.57 \\ Kodak-11 & 44.34 & 0.9854 & 50.99 & 43.84 & 0.9834 & 50.80 \\ Kodak-12 & 44.34 & 0.9788 & 49.47 & 43.82 & 0.9761 & 48.84 \\ Kodak-13 & 44.30 & 0.9948 & 52.49 & 43.88 & 0.9941 & 53.46 \\ Kodak-14 & 44.27 & 0.9896 & 50.76 & 43.89 & 0.9884 & 51.67 \\ Kodak-15 & 44.34 & 0.9800 & 48.10 & 43.92 & 0.9777 & 47.74 \\ Kodak-16 & 44.32 & 0.9825 & 49.82 & 43.89 & 0.9805 & 49.87 \\ Kodak-17 & 44.17 & 0.9819 & 48.40 & 43.84 & 0.9800 & 48.82 \\ Kodak-18 & 44.14 & 0.9879 & 50.11 & 43.77 & 0.9865 & 51.20 \\ Kodak-19 & 44.44 & 0.9842 & 51.12 & 43.96 & 0.9823 & 51.03 \\ Kodak-20 & 44.89 & 0.9845 & 44.99 & 44.27 & 0.9832 & 44.32 \\ Kodak-21 & 44.32 & 0.9828 & 49.16 & 43.91 & 0.9808 & 49.27 \\ Kodak-22 & 44.41 & 0.9853 & 50.35 & 43.95 & 0.9834 & 50.38 \\ Kodak-23 & 44.35 & 0.9758 & 48.43 & 43.94 & 0.9731 & 48.39 \\ Kodak-24 & 44.27 & 0.9876 & 49.16 & 43.84 & 0.9862 & 49.20 \\ \hline \hline \end{tabular}
\end{table}
Table 4: Objective quality metrics PSNR, SSIM and PSNR-HVS-M for watermarked images.  
\begin{table}
\begin{tabular}{c c c c c c c c c c} \hline \hline  & **Embedding** & **10\%** & **20\%** & **30\%** & **40\%** & **50\%** & **60\%** & **70\%** & **80\%** & **90\%** \\ \hline \multirow{3}{*}{PSNR} & 1-LSB & 27.81 & 25.02 & 23.50 & 21.79 & 20.30 & 19.01 & 17.57 & 15.79 & 13.286 \\  & 2-LSB & 35.80 & 32.71 & 30.63 & 29.25 & 28.13 & 27.06 & 26.00 & 24.82 & 23.07 \\  & 3-LSB & 35.52 & 32.48 & 30.43 & 29.08 & 28.03 & 27.06 & 26.22 & 25.27 & 23.68 \\ \hline \multirow{3}{*}{SSIM} & 1-LSB & 0.953 & 0.903 & 0.851 & 0.787 & 0.713 & 0.629 & 0.533 & 0.410 & 0.250 \\  & 2-LSB & 0.967 & 0.935 & 0.901 & 0.867 & 0.832 & 0.793 & 0.750 & 0.696 & 0.615 \\  & 3-LSB & 0.962 & 0.925 & 0.888 & 0.851 & 0.813 & 0.772 & 0.730 & 0.680 & 0.604 \\ \hline \multirow{3}{*}{PSNR-HVS-M} & 1-LSB & 26.19 & 22.83 & 20.91 & 18.94 & 17.04 & 15.26 & 13.54 & 11.49 & 8.78 \\  & 2-LSB & 33.29 & 30.19 & 28.14 & 26.69 & 25.57 & 24.37 & 23.02 & 21.32 & 18.87 \\ \cline{1-1}  & 3-LSB & 33.25 & 30.18 & 28.15 & 26.73 & 25.69 & 24.71 & 23.76 & 22.35 & 19.90 \\ \hline \hline \end{tabular}
\end{table}
Table 3: PSNR, SSIM and PSNR-HVS-M from the reconstruction process.