# Data Embedding in SHVC Video Using Threshold-Controlled Block Splitting
## 4 Experimental Results
### Embedding Capacity  
The embedding capacity of each video using the proposed method is recorded in Tables 4 and 5 for the LDP and AI configurations, respectively. Generally, video sequences with complex texture or fast-moving scenes (e.g., _PartyScene_ and _BasketballDrill_), which are predicted by using more small PBs, can offer more rooms for data embedding, and vice versa (e.g., _RushHour_). In the best case scenario, the sequence _PartyScene_ embeds 516.9 kbps with an average 7.0% bit rate overhead for the LDP configuration, while it embeds 1578.6 kbps with an average 2.9% bit rate overhead for the AI configuration. On the other hand, the sequence _RushHour_, which contains smooth regions of different sizes and mostly static background (due to the air ripples caused by heat) offers the smallest embedding capacity. The embedding capacity for this video sequence is expected to be small because most slices in the video are coded by using large PB.  
Figure 7: Rate distortion curve for the original compressed videos and the processed videos using the AI configuration.  
\begin{table}
\begin{tabular}{l c c c c c c c c c c} \hline \hline \multirow{2}{*}{**Sequence**} & \multirow{2}{*}{**QP**} & \multicolumn{3}{c}{\(\tau_{\mathbf{0}}\)} & \multicolumn{3}{c}{\(\tau_{\mathbf{5}}\)} & \multicolumn{3}{c}{\(\tau_{\mathbf{10}}\)} \\  & & **BL** & **EL** & **Total** & **BL** & **EL** & **Total** & **BL** & **EL** & **Total** \\ \hline  & 22 & 15.7 & 6.7 & 22.4 & 42.9 & 36.1 & 79.1 & 79.5 & 138.8 & 218.3 \\ _RushHour_ & 26 & 6.4 & 2.3 & 8.7 & 19.0 & 12.0 & 31.1 & 35.2 & 45.8 & 81.0 \\ @30 Hz & 30 & 2.3 & 0.7 & 3.0 & 7.7 & 4.4 & 12.2 & 15.7 & 17.5 & 33.2 \\  & 34 & 0.7 & 0.2 & 0.8 & 2.6 & 1.3 & 3.9 & 6.1 & 6.5 & 12.6 \\ \hline  & 22 & 43.6 & 79.7 & 123.3 & 78.7 & 182.4 & 261.1 & 106.6 & 296.7 & 403.2 \\ _FourPeple_ & 26 & 28.7 & 49.2 & 77.9 & 54.0 & 107.0 & 161.0 & 78.3 & 178.1 & 256.4 \\ @60 Hz & 30 & 14.9 & 24.7 & 39.6 & 31.0 & 56.6 & 87.6 & 48.2 & 99.8 & 148.0 \\  & 34 & 5.0 & 8.1 & 13.1 & 12.1 & 20.7 & 32.8 & 22.1 & 43.4 & 65.6 \\ \hline  & 22 & 21.5 & 78.9 & 100.4 & 47.5 & 174.1 & 221.6 & 66.3 & 242.4 & 308.7 \\ _BlueSky_ & 26 & 14.1 & 47.1 & 61.2 & 35.5 & 120.4 & 155.9 & 54.4 & 185.0 & 239.3 \\ @24 Hz & 30 & 7.5 & 22.3 & 29.8 & 25.4 & 78.7 & 104.0 & 41.1 & 126.8 & 167.9 \\  & 34 & 3.5 & 7.9 & 11.5 & 13.3 & 35.1 & 48.3 & 29.6 & 82.9 & 112.6 \\ \hline  & 22 & 23.0 & 67.6 & 90.6 & 44.8 & 141.8 & 186.6 & 65.6 & 218.5 & 284.1 \\ _BasketballDrill_ & 26 & 14.8 & 34.9 & 49.7 & 28.7 & 72.2 & 100.9 & 44.1 & 113.0 & 157.1 \\ @50 Hz & 30 & 8.4 & 18.8 & 27.2 & 17.4 & 38.8 & 56.1 & 27.9 & 64.6 & 92.5 \\  & 34 & 3.5 & 7.9 & 11.4 & 8.2 & 18.6 & 26.9 & 14.9 & 33.5 & 48.4 \\ \hline  & 22 & 43.9 & 190.5 & 234.4 & 86.7 & 341.2 & 427.9 & 108.6 & 408.4 & 516.9 \\ _PartyScene_ & 26 & 30.7 & 142.1 & 172.8 & 63.7 & 255.4 & 319.1 & 86.8 & 316.1 & 402.9 \\ @50 Hz & 30 & 17.4 & 91.2 & 108.6 & 39.5 & 172.7 & 212.2 & 59.5 & 225.5 & 285.0 \\  & 34 & 6.6 & 37.8 & 44.4 & 17.9 & 85.2 & 103.1 & 31.4 & 127.9 & 159.  
Results also suggest that when \(\tau\) is set to a larger value, higher embedding capacity is achieved. This trend is most apparent for the sequence _RushHour_ because, when \(\tau\) increases, more split blocks are coded instead of the block sizes suggested by RDO. Hence, a trade-off between embedding capacity and bit rate overhead can be achieved by tuning \(\tau\). It is observed that AI achieves, in general, a higher embedding capacity in comparison to LDP. The largest difference is observed in the sequence _FourPeople_, followed by _BasketballDrill_, _BlueSky_, _PartyScene_, _RaceHorses_ and _RushHour_. Notably, for the sequence _FourPeople_, AI achieves, on average, \(\sim\)5.9 \(\times\) more embedding capacity for \(\tau_{10}\) in comparison to LDP. This is because the sequence _FourPeople_ contains 70% static background scenes. On the other hand, for the sequence _RushHour_, AI achieves 2.2\(\sim\)4.3 \(\times\) more embedding capacity in comparison to LDP for \(\tau_{10}\).