## 4 Comparative Results
The medium-motion segment shows slightly higher PSNR for the same bpp values compared to the slow-motion segment, indicating that medium-motion scenes might handle data embedding more efficiently. Table 12 illustrates the performance of the film's fast-motion segment. The results confirm the observed trend, where PSNR increases with bpp. For example, at 100 bpp, the PSNR is 31.98 dB, compared to 46.95 dB at 17.65 bpp. The PSNR values are lower across the board in the fast-motion segment compared to the slow and medium-motion segments, which may be attributed to the challenges of maintaining visual quality in high-motion scenes. The \(C\) threshold is the normalized version of the \(C^{\prime}\) parameter shown in Equation (7). The parameter \  
In the Octree segmentation technique, there is another critical parameter that needs to be studied, which is the minimum cube size. Therefore, another experiment was performed to examine the effect of tuning the minimum cube size parameter. Tables 13-15 present the results obtained when hiding using different sizes of the allowed minimum cube sizes. Tables 13-15 show that increasing the cube sizes, increases the hiding capacity. The reason is that by reducing the size of the minimum cube size the number of cubes increases and, therefore, each cube will produce some significant DCT coefficients to maintain the structure of the cube to be able to regenerate the spatial representation with minor degradations. Naturally, increasing the number of significant DCT coefficients will reduce the number of insignificant DCT coefficients, and therefore, reduced capacity rates will be achieved. \begin{table}
\begin{tabular}{c c c c c c c} \hline \hline
**Host** & **Frames** & **C** & **Scale \(k\)** & **Capacity (bpp)** & **PSNR (dB)** & **SSIM** & **CCQE (\%)** \\ \hline \multirow{8}{*}{Documentary} & \multirow{8}{*}{16} & 25 & 12.75 & 37.28 & 0.9219 & 58.93 \\ \cline{3-6}  & & 50 & 12.75 & 43.42 & 0.9778 & 61.86 \\ \cline{3-6}  & & 75 & 12.75 & 46.73 & 0.9899 & 62.99 \\ \cline{3-6}  & & 100 & 12.75 & 48.75 & 0.9942 & 63.61 \\ \cline{3-6}  & & 25 & 21.61 & 33.29 & 0.8542 & 74.7 \\ \cline{3-6}  & & 50 & 21.61 & 35.79 & 0.9316 & 77.26 \\ \cline{3-6}  & & 75 & 21.61 & 36.28 & 0.9482 & 77.79 \\ \cline{3-6}  & & 100 & 21.61 & 36.4 & 0.9537 & 77.96 \\ \cline{3-6}  & & 25 & 23.63 & 28.36 & 0.7479 & 75.01 \\ \cline{3-6}  & & 50 & 23.63 & 28.88 & 0.7937 & 76.28 \\ \cline{3-6}  & & 75 & 23.63 & 28.91 & 0.8009 & 76.47 \\ \cline{3-6}  & & 100 & 23.63 & 28.9 & 0.8026 & 76.51 \\ \hline \hline \end{tabular}
\end{table} 
Table 13: Detailed results of the proposed Octree-hiding technique using the **Documentary slow-motion segment** as the host video segment with different minimum cube sizes. \begin{table}
\begin{tabular}{c c c c c c c c} \hline \hline
**Host** & **Frames** & **C** & **Scale \(k\)** & **Capacity (bpp)** & **PSNR (dB)** & **SSIM** & **CCQE (\%)** \\ \hline \multirow{8}{*}{Documentary} & \multirow{8}{*}{8} & 25 & 12.75 & 37.15 & 0.9258 & 59 \\ \cline{3-6}  & & & 50 & 12.75 & 43.19 & 0.9794 & 61.85 \\ \cline{3-6}  & & 75 & 12.75 & 46.31 & 0.9907 & 62.91 \\ \cline{3-6}  & & 100 & 12.75 & 48.07 & 0.9946 & 63.44 \\ \cline{3-6}  & & 25 & 21.61 & 32.87 & 0.8689 & 74.96 \\ \cline{3-6}  & & 50 & 21.61 & 35.08 & 0.9387 & 77.26 \\ \cline{3-6}  & & 75 & 21.61 & 35.47 & 0.9535 & 77.72 \\ \cline{3-6}  & & 100 & 21.61 & 35.56 & 0.9583 & 77.87 \\ \cline{3-6}  & & 25 & 23.63 & 27.3 & 0.7421 & 74.6 \\ \cline{3-6}  & & 50 & 23.63 & 27.74 & 0.784 & 75.76 \\ \cline{3-6}  & & 75 & 23.63 & 27.77 & 0.7901 & 75.92 \\ \cline{3-6}  & & 100 & 23.63 & 27.77 & 0.7912 & 75.94 \\ \hline \hline \end{tabular}
\end{table} 
Table 14: Detailed results of the proposed Octree-hiding technique using the **Documentary medium-motion segment** as the host video segment with different minimum cube sizes. The advantage on the other hand of using a small minimum cube size is the enhanced quality of the carrier signal generated by the proposed Octree-hiding scheme.