## 3 Results and Discussion
### The Mechanism of the Formation of the Multiscan Video Signal on the Basis of Its Impulse Response
In the case of the conventional method for measuring the light zone width, the observed multiscan video signal \(v(\hat{t})\) was differentiated; after that, the extrema of the first derivative of the video signal were determined. The extrema coordinates were taken as the light zone boundaries. From the analysis of the diagrams in Figure 8a it follows that the reconstruction of the LZ width using the SSPs (dashed line) is in accordance with the law close to the linear law  
over the entire range of the zone width values (in the region of narrow zones as well). At the same time, it can be seen that in the conventional method for the reconstruction of a light zone width (solid line on the diagrams in Figure 8a), the zone width is characterized by non-linear dependence, which gives a significant overestimation of the width value for narrow zones. The diagrams of the relative error at the light zone reconstruction are given in Figure 8b and indicate the high accuracy of the zone width reconstruction with the use of the SSPs, even in the region of very narrow LZs. It should also be noted that in the region of wide LZs, both methods provide the possibility of estimating the zone width with a high accuracy and sufficiently close to the real values. Therefore, in the diagrams in Figure 8, the range of the normalized values of the LZ width is limited by the value 0.025. Figure 9 presents the results of the measurements of the normalized light zone brightness. For normalization, the zone brightness value was taken as 1. Brightness was computed with the use of the SSPs in accordance with expression (27). When the LZ brightness was reconstructed by the conventional method, the extremum of the observed multiscan video signal \(v(\hat{t})\) was found. The analysis of the diagrams in Figure 9a shows that in the region of narrow zones, the conventional method gives a significant loss of brightness. It is associated with the smearing of the LZ rectangular pulse by the multiscan and the \"depression\" of the pulse amplitude, especially in the region of a narrow zone, which is illustrated in \[M=W_{0} \tag{18}\]3 Conversely, the determination of the light zone brightness by the offered method using the SSPs allows for a highly accurate reconstruction of its value in the region of narrow zones as well. Figure 9b shows the dependencies of the relative error in the LZ brightness determination. From the analysis of the dependencies, it follows that the use of the conventional method for the reconstruction of the amplitude of the smeared narrow rectangular pulse is impossible due to the high error values. In the case of the use of the SSPs, there is the possibility of the highly-accurate reconstruction of the LZ brightness for very narrow zones. \[M=W_{0} \tag{18}\]4 Results of the reconstruction of the light zone width by the video signal \(v(\hat{t})\) (solid line—for the conventional method for the reconstruction using the first derivative of the video signal \(v(\hat{t})\); dashed line—for the reconstruction with the use of the SSPs): (**a**) the dependence of the measured values of the normalized width of the LZ on the real values of the width; (**b**) relative error of the LZ width determination depending on its real value. Figure 10 presents the results of the experiments on the localization of the light spot on the multiscan surface for LZs of different widths. For this, in the centre of the multiscan, a light zone was formed. The left edge of the zone remained immobile and its coordinate corresponded to the value of 0.5. The right edge of the zone was moved to the right, making the zone wider (as it had been in the previous experiments). In this case, the middle of the LZ also moved to the right.