E.V. Kurennoy

One of the ways of enhancing the receiving television images of small television systems of surveillance is increasing the contrast of small-gains details which is done through transmission picture signals through two-dimensional not casual filter of lower frequencies and the following subtraction of the results of processing from proceeding video signal. In order to provide not power-intensive processing of video signals in real time and also large-sized characteristics of filters it is advisable to use discrete-analogue medium performed, for example, on line devices with charged communication. It is more interesting to use cheap short lines with small amount of cells. In this case the equivalent width of impulse characteristics can exceed the length of computing medium that provides receiving more narrow frequency characteristics. But restrictions of the medium of processing lead to the distortion of filter characteristics. This article is devoted to this problem.