## 6 Experimental Results and Discussion
### Differences between Original and Temporal Recovery Data in Multifractal Spectrum Estimation  
Different crf values from 20 to 40 are applied to demonstrate the effect of compression levels in practice. The standard effect of crf selection can be seen in Figure 9. If the crf increases, frame sizes are smaller, and the decreasing trend of trace sum is obvious in Figure 9a. In Figure 9b, the change in crf value selection is shown in the multifractal domain. This is demonstrated via multifractal spectra and six crf values for compressed UHD ReadySetGo sequence of 120 fps. Six spectra are found for sequences that are named as original here, since no TRR is applied in Figure 9b. The lowest crf values show narrower spectra, meaning the spectrum width is relatively small and vice versa. Multifractal spectra for ReadySetGo with crf24 are presented in Figure 10a, where TRR is compared with the original. Similarly, TRR spectrum is shown for crf36, where it can be noticed that the relation is quite different, especially in terms of asymmetry (_a_), as opposed to the higher quality in crf24, as shown in Figure 10b. The calculation of multifractal characteristics enables going a step further with the analysis and the comparison between the two scenarios/cases: TRR and original. It is believed that significant data loss in TRR can be manifested through specific features compared with original UHD 120 fps sequences. Each spectrum is characterized by several points: minimum \(\alpha\) value (\(\alpha_{\text{min}}\)), maximum \(\alpha\) value (\(\alpha_{\text{max}}\)), \(\alpha\) corresponding to curve maximum (\(\alpha_{0}\)), and \(\alpha\) corresponding to information dimension (\(\alpha_{1}\)). These traditional characteristics, along with spectrum width, are presented in Table 4 for TRR and six crf values. Similarly, these characteristics are shown for original sequences and six crf values in Table 5.  
Wider widths are generally found in the TRR case, and this can be a suitable feature if a reference/original exists. Unfortunately, this is not the case in practical implementations. Similar results can be obtained for the right slope and other characteristics since, for the ReadySetGo details and motion, spectra are quite different in TRR compared with \begin{table}
\begin{tabular}{c c c c c c c} \hline \hline
**No.** & **Description** & **crf20** & **crf24** & **crf28** & **crf32** & **crf36** & **crf40** \\ \hline
1 & Temporal recovery & 0.7910 & 0.7840 & 0.7807 & 0.7957 & 0.8100 & 0.8212 \\
2 & Original & 0.8652 & 0.8943 & 0.8848 & 0.8721 & 0.8678 & 0.8585 \\
3 & \(H_{diff}\) & \(-8.58\%\) & \(-12.33\%\) & \(-11.77\%\) & \(-8.76\%\) & \(-6.67\%\) & \(-4.34\%\) \\
4 & \(H_{diff,average}\) & \(-8.74\%\) & \(-11.51\%\) & \(-7.65\%\) & \(-7.94\%\) & \(-3.29\%\) & \(+1.30\%\) \\ \hline \hline \end{tabular}
\end{table} 
Table 3: Differences in Hurst evaluation using R/S statistics for UHD 120 fps compressed ReadySetGo sequence. Figure 9: (**a**) Decreasing trend of trace sum; (**b**) multifractal spectra for ReadySetGo with different crf values. the original, regardless of crf selection. When a compressed video has a lot of details, particularly recovered video, the right side, for example, expressed through \(w_{r}\), contributes to the wider width. This is illustrated in Figure 11a. An additional case is also represented, and it is evident that similar results compared to the original data are obtained. Six TRR and six original sequences are presented in Figure 11a in multifractal domain. This is repeated for other UHD 120 fps video content as well. The spectra for HoneyBee and YachtRide are also presented in Figure 11, precisely Figure 11b and Figure 11c, respectively. By examining the cases and corresponding characteristics for other spectra, it can be seen that the abovementioned features are not suitable for possible recovery detection, regardless of crf and video content.