###### Abstract
At the same time, the video signal from narrow light zones is blurred so significantly relative to their width, that the traditional method of determining the parameters of the LZ (coordinates, width, and illumination) from the derivatives of the VS ceases to work. The relevance of the problem becomes more acute in the case of measuring the geometric parameters of small objects in the condition of smeared image [27; 28], for example: during contactless control over the diameters of fibres in the process of their manufacturing in fibre optics, the diameters of cables in the cable industry, the diameter of a narrow laser beam at its compression in laser optoelectronic systems in order to improve the signal/noise ratio, etc. To increase the accuracy when determining the width of blurred small-sized structural elements of various graphic images in [29; 30], the possibility of using spatial-structural parameters (mass, centroid, dissipation, extent, and brightness) is considered. In [31], to solve the problem of the determination of the light zone dimensions and coordinates by the smeared-out video signal of the scanistor \(p\)-\(n\)-\(p\) structure, it was suggested using spatio-structural parameters (SSPs). The SSPs make it possible to estimate the width of the rectangular signal of an action, localize it in space and determine its amplitude by the smeared response of the path of the signal reception and transmission. The efficiency of using the SSPs is largely determined by taking into account the features of the multiscan operation in the time-pulse mode (in particular, the effect of changing the shape and amplitude of the VS when changing the width of the information LZ and the corresponding convergence of the transient functions of the multiscan). The purpose of the present paper is to improve the accuracy of measurements of the width, location, and brightness of LZ on the MS's photosensitive surface (corresponding to the geometric parameters of small objects) using the spatial and structural parameters of the video signal. Features of the Multiscan Operation during the Determination of the Geometric Parameters of Objectsthe relief of light by the boundary of zero voltage [5; 12; 15] moving along the photosensitive surface by sawtooth voltage is used. To create the boundary, the parallel-connected MS resistive dividers are supplied with constant voltage \(E_{0}\) from the offset voltage source (OVS) to one of the pins, of which the sawtooth voltage generator (SVG) of polling with amplitude \(E_{0}\), with the opposite polarity connected. The image of an object (Ob) illuminated by a radiation source (RS) is projected on the MS in the form of a light zone (LZ) with coordinates \(x_{1}\), \(x_{2}\), and of the edges of the controlled object. The switching of one more photodiode cell in the load circuit is performed by the zero voltage line at the moment when the saw-tooth voltage reaches the voltage level on the OVS cell. The cell photodiode switches from the closed to the open position, and the switching diodes from the open to the closed position. Real MS is not an ideal device. There is a limited slope of switching of real I-V characteristics of photodiode cells, which determines the width of the volt-scanning aperture, equal to the quadruple temperature potential, \(E_{0}\)[12]. The formation of the MS output current \(I_{out}\) at the input of a current-to-voltage converter (CVC) is performed by the progressive switching of photodiodes by a sawtooth scanning voltage taking into account the volt aperture of photodiode cells. At the differentiation of the voltage from the CVC output by a differentiating unit (DU), due to the smearing of the transi  
Figure 1: Enabling a multiscan using the “scanistor” scheme in the analogue mode.