# Versatile Video Coding-Post Processing Feature Fusion:
## 4 Experimental Evaluations and Discussion
### Ablation Studies  
The ablation study involves a comparative evaluation of the performance of various feature extraction blocks. The proposed method's PSNR performance is compared in Tables 5 and 6, showcasing the impact of 8 and 16 feature extraction blocks in RA and LD configurations. Notably, the average PSNR values for RA configuration are 29.78 dB, 37.24 dB, and 37.60 dB, while those for LD configuration are 28.81 dB, 36.52 dB, and 36.91 dB. PSNR without proposed VVC-PPFF can be found at Tables S3 and S4 of the supplementary document for RA and LD configuration, respectively. A visual quality comparison is presented in Figure 11, showcasing the proposed method's performance with 8 feature extraction blocks in RA and LD scenarios at QP 42 for the MarketPlace and PartyScene sequences. The results indicate that using 16 feature extraction blocks yields an average luma PSNR gain of 0.25 dB and 0.03 dB compared to using 8 blocks for both RA and LD scenarios, respectively. Tables 7 and 8 present a PSNR comparison of the proposed method with 12 and 16 feature extraction blocks in both RA and LD configurations. The results reveal that the average PSNR values are 29.82 dB, 37.28 dB, and 37.73 dB for the RA scenario and 28.83 dB, 36.56 dB, and 36.92 dB for the LD scenario, respectively. Figure 10: RD curve performance comparison for four different test sequences in LD configuration. Figure 9: RD curve performance comparison for five different test sequences in RA configuration. \begin{table}
\begin{tabular}{c c c c c c c} \hline \hline \multirow{2}{*}{**Sequences**} & \multicolumn{4}{c}{**PSNR (8 Block)**} & \multicolumn{4}{c}{**PSNR (16 Block)**} \\ \cline{2-7}  & **Y** & **U** & **V** & **Y** & **U** & **V** \\ \hline MarketPlace & 30.81 & 38.65 & 39.04 & 30.83 & 38.73 & 39.14 \\ \hline RitualDance & 31.55 & 40.17 & 39.43 & 31.58 & 40.13 & 39.45 \\ \hline Cactus & 29.36 & 36.27 & 36.79 & 29.39 & 36.32 & 36.87 \\ \hline BasketballDrive & 30.60 & 38.09 & 37.13 & 30.63 & 38.22 & 37.18 \\ \hline BQTerrace & 28.69 & 37.72 & 40.29 & 28.72 & 37.68 & 40.27 \\ \hline BasketballDrill & 29.07 & 34.97 & 34.46 & 29.09 & 34.90 & 34.55 \\ \hline BQMall & 28.04 & 36.32 & 36.81 & 28.06 & 36.39 & 36.85 \\ \hline PartyScene & 24.35 & 33.30 & 33.68 & 24.35 & 33.21 & 33.60 \\ \hline RaceHorses & 26.88 & 33.15 & 34.56 & 26.89 & 33.24 & 34.61 \\ \hline Average & 28.81 & 36.52 & 36.91 & 28.84 & 36.54 & 36.95 \\ \hline \hline \end{tabular}
\end{table} 
Table 6: PSNR comparison of proposed method with 8 and 16 feature extraction blocks in LD configuration. Figure 11: Visual quality comparison of proposed method with 8 feature extraction blocks for RA and LD scenarios at QP 42: (**a**) MarketPlace Sequence and (**b**) PartyScene Sequence. \begin{table}
\begin{tabular}{c c c c c c c} \hline \hline \multirow{2}{*}{**Sequences**} & \multicolumn{4}{c}{**PSNR (8 Block)**} & \multicolumn{4}{c}{**PSNR (16 Block)**} \\ \cline{2-7}  & **Y** & **U** & **V** & **Y** & **U** & **V** \\ \hline MarketPlace & 30.81 & 38.65 & 39.04 & 30.83 & 38.73 & 39.14 \\ \hline RitualDance & 31.55 & 40.17 & 39.43 & 31.58 & 40.13 & 39.45 \\ \hline Cactus & 29.36 & 36.27 & 36.79 & 29.39 & 36.32 & 36.87 \\ \hline BasketballDrive & 30.60 & 38.09 & 37.13 & 30.63 & 38.22 & 37.18 \\ \hline BQTerrace & 28.69 & 37.72 & 40.29 & 28.72 & 37.68 & 40.27 \\ \hline BasketballDrill & 29.07 & 34.97 & 34.46 & 29.09 & 34.90 & 34.55 \\ \hline BQMall & 28.04 & 36.32 & 36.81 & 28.06 & 36.39 & 36.85 \\ \hline PartyScene & 24.35 & 33.30 & 33.68 & 24.35 & 33.21 & 33.60 \\ \hline RaceHorses & 26.88 & 33.15 & 34.56 & 26.89 & 33.24 & 34.61 \\ \hline Average & 28.81 & 36.52 & 36.91 & 28.84 & 36.54 & 36.95 \\ \hline \hline \end{tabular}
\end{table} 
Table 6: PSNR comparison of proposed method with 8 and 16 feature extraction blocks in LD configuration. The impact of the QP map as an additional input can be observed from the quantitative analysis presented in Tables 9 and 10. PSNR improvements with the QP map and without the QP map is shown in Table 9 for RA configuration and QP 42.