Parameters Impact on Video Quality

In this Section, we study the effect of the five parameters (BR, LR, CLP, FR and RA) on video quality. As it is impossible to visualize the variation of the quality as a function of all the five parameters, we chose to visualize on a set of 3D Figures in which we varied two parameters and kept the other three fixed. The MOS value is computed as a function of the values of all the five parameters by using a RNN trained with the quality databases described and evaluated in Chapter 6. It should be noted that the axis of these Figures are rotated in such a way to give the best visualization of each Figure. This means that the orientation of some axis can vary from Figure to Figure. In addition, the scale of quality axis (or Z-axis) is variable from one Figure to another to show some useful features of the given Figure. In the following subsections, we analyze the effect of each parameter on video quality and we also discuss their main combined effects.