SU421881A1 - - Google Patents

Description

one

The invention relates to the field of applied television.

A device for measuring the area of objects is known, comprising two transmitting television cameras, one of which contains a Vidicon transmission tube, a Schmidt trigger, a coincidence circuit, a recording amplifier, a meter, a delay line and a marker unit.

However, in such a device, the shape of the object affects the accuracy of measurements.

The purpose of the invention is to reduce the influence of the shape of an object on the accuracy of measurements.

This is achieved by adding an additional Schmidt trigger and an "OR." Scheme to the proposed device. One input of the circuit is connected to the marker block, the second input is connected to the output of the delay line, the third input is connected via an additional Schmidt trigger to the output of the second transmitting television camera, and the output is connected to the input of the meter.

The drawing shows a block diagram of the described device.

The device contains a television camera 1, Schmidt trigger 2, a coincidence circuit 3, an OR circuit 4, a delay line 5, a recording amplifier 6, a television camera 7, Schmidt trigger 8, a marker unit 9 and a meter 10. The television camera 7 has a transmitter

tube type vidicon (not shown in the drawing).

The device works as follows. A multi-gradation (halftone) television video signal produced by a television camera 1, 1 is fed to a trigger 2, which converts a multi-gradation video signal into a two-gradation signal. In this case, the conversion is carried out at a given level of restriction. From the trigger 2, the video signal is transmitted to the coincidence circuit, to the same circuit, through the OR circuit, a pulse is sent from block 9, with a duration shorter than the video signal duration from the selected line figure, and

the location of the pulse time must coincide with the video signal from the selected shape. Since these two signals coincide in time, but do not coincide in duration, the coincidence circuit outputs to the delay line

and a video recording amplifier corresponding to the pulse duration. The recording amplifier amplifies this signal to the magnitude necessary to efficiently draw the video signal through the cathode to a set of video cameras 7.

At the target of the Vidicon, the recorded potential relief due to charge spreading and reading by the defocused beam before the start of the next scan cycle takes a slightly larger area than the UFO.