# Internet Video Delivery Improved by Super-Resolution with GAN
## 7 Experimental Results
### Data Transfer Decrease  
This subsection presents the evaluation to measure the decrease in the amount of data that flows throughout the networking infrastructure. This infrastructure connects the video source and surrogate servers that distribute video sequences in mono-resolution and multi-resolution modalities.  
In the first scenario, we show the decrease in data transfer for a mono-resolution modality. In this modality, the assumption is that low-resolution videos \(V^{LR}\) encoded in 360p or 540p are super-resolved using a 2\(\times\) factor, and engaged audiences access this content at 720p or 1080p resolution (see Figure 6(a)).  
Figure 7(a) shows the CDF of the decrease in data transfer for the mono-resolution modality. The low-resolution streams, i.e., 360p and 540p, have the highest quality (\(QP=0\)), and we used 220 video sequences. Equation (11) gives the decrease in the amount of data.  
\[D_{ceressing}(V_{i})=1-\frac{size(V_{i}^{LR})}{size(V_{i}^{HR})} \tag{11}\]  
In the 360p mono-resolution modality, the probability is zero that the decrease in data transfer will reach a value less than 69.48%, and the probability is 100% that the decrease in data transfer will reach 82.23%. In other words, this decrease will be in the range of 69.48% and 82.23%. The decrease in the 540p mono-resolution modality will be from 66.67% to 81.61%.  
Numerically, the 360p mono-resolution modality has 220 video sequences that demand 13.64 GB on data transfer, i.e., 2.6 GB (360p) and 11.04 GB (760 p), a decrease equal to 76.45% results in less than 8.44 GB going into the video service infrastructure. The 560p mono-resolution modality has 220 video sequences, the demands on data transfer are 6.0 GB (540p) and 25.9 GB (1080p), and a decrease equal to 76.8% results in less 19.9 GB going into that infrastructure.  
Figure 7(b) shows the CDF of the multi-resolution modality, i.e., we transmit 360p and 540p video sequences to surrogate servers and super-resolved them to 720p and 1080p, respectively. In this scenario, four versions of each video sequence are available to audiences as shown in Figure 6(b).  
Figure 6: The super-resolution-based content distribution policy for mono- and multi-resolution services. (a) Monoresolution service: 720p or 1080p resolution. (b) Multiresolution service: 360p, 540p, 720p, and 1080p.  
Equation (12) gives the decrease in data transfer.  
\[D_{ceasing}(V_{i})=1-\frac{size\Big{(}V_{i360p}^{LR}+V_{i540p}^{LR}\Big{)}}{size \Big{(}V_{i360p}^{LR}+V_{i540p}^{LR}+V_{i720p}^{HR}+V_{i1080p}^{HR}\Big{)}} \tag{12}\]  
Figure 8b shows the CDF of the decrease in data transfer for the multi-resolution modality. The decrease ranges from 75.67% to 84.59%. Numerically, 8.63 GB is the amount of data demanded by low-resolution videos (360p and 540p). In contrast, 45.57 GB is the amount of data after the super-resolving procedure, which includes the four resolutions, i.e., 360p, 540p, 720p, and 1080p, resulting in an absolute gain of 36.94 GB. This results in 81.06% fewer data going into the distribution infrastructure to serve the audience from the surrogate servers.