SU1412001A1 - Device for detecting the video signal of object against background noise - Google Patents

Abstract

The invention relates to television. The purpose of the invention is to increase the accuracy of the video signal of the object from the background. The device contains a block of suppression of 1 background component, multipliers (P) 2 and 5, gamma corrector 3 and dual channel r-r 4 compensating signals, consisting of master r-6 and two channels 7, made each of adder 8 and gamma corrector 9. When entering horizontal and frame sync pulses on r-4, it adjusts the span, symmetry and fixation level of the sawtooth and parabolic forms of the horizontal and frame frequencies generated by r-6, as well as the span shape compensating signal. The received signals are sent to P 2 and 5. P 2 reduces the unevenness of the background component of the video signal from the real plot and increases the range of the video pulses in areas with low light sensitivity. Next, the video signal suppresses the component and the received signal goes to R5. Here, the unevenness in the raster of the range of video pulses from dimly lit objects is reduced to a minimum. At the same time, the magnitudes of video pulses from dimly lit objects and objects with medium illumination, which will increase the accuracy of the selection of the signal, approach each other. Device according to p. 2 and 3 f-ry differs in the performance of the G-4 and 6. GW. f-ly, 1 silt ... with

Description

The invention relates to television, specifically to camera channels of applied television systems.

The purpose of the invention is to improve the accuracy of the selection of the video signal of the object.

The drawing shows a structural electrical circuit of the device for separating the video signal of an object from the background.

A device for separating a video signal of an object from the background comprises

a background component suppression unit 1, a first multiplier of 2 signals, an output gamma corrector 3, a two-channel generator of 4 compensating signals, a second multiplier of 5 signals. The two-channel generator 4 of the compensating signals contains the master oscillator 6, the first and second identical channels 7-1, 7-2 form the output signals, the first and second adders 8-1, 8-2, the first and second gamma correctors 9-1, 9- 2

A device for separating a video signal of an object from the background works as follows.

When the horizontal and vertical sync pulses arrive at the inputs of the master oscillator 6, which enters the two-channel oscillator 4 of the compensating signals, synchronized voltages of the sawtooth and parabolic frequencies of the horizontal and vertical frequencies are formed at its outputs.

From the output of the generator 6, signals are fed respectively to the inputs of the first and second adders 8-1, 8-2,, the first and second identical channels 7-1, 7-2, where the span, symmetry and voltage clamping level of the sawtooth and parabolic forms of horizontal and frame frequencies from the output of adders 8-1, 8-2. The signals are supplied to the first and second gamma correctors 9-1, 9-2, respectively, in which the shape of the compensating signal is adjusted. In this case, the shape and magnitude of the compensating signal is set such that, at the output of the first multiplier, 2 signals will have minimal irregularity in raster: video signal; from uniform illumination, and at the output of the second multiplier 5 signals - from small, for example, point details of the optical image. When the video signal from the real connection is transmitted through the first multiplier 2 signals, the video signal with reduced irregularity of the background component and the increased range of video pulses in the areas with reduced light sensitivity will be received at the output of block 1 by partly limiting video pulses on top and subsequent low-pass filtering, the background component is made, which is then subtracted from the video signal.

The signal from block 1 is input to the second multiplier 5

signals, to the second, the input of which pos Turns off the signal from the second identical channel 7-2 of the two-channel generator 4 compensating signals. In the second signal multiplier 5, the non-uniformity of the raster of the range of video pulses from dimly lit Objects is reduced to a minimum,

about c 0 5

-

five

When passing through the output gamma corrector 3, the video signal from bright objects in the raster areas amplified in the first and second multipliers 2 and 5 signals with maximum coefficients is compressed in accordance with the minimum, for example, 0.2, gamma value on the upper plot the amplitude characteristics of the output gamma corrector 3 with a gamma not exceeding 1.0, and the minimum, for example 0.2, in the upper part of its amplitude response.

The reduction in the first multiplier 2 of the irregularity signal along the raster of the signal amplitude from the objects and the background is due to the unevenness in the sensitivity field, a decrease in the second multiplier; 5 non-uniformity of the signal raster from objects. It is caused by non-uniformity of the signal from objects and irregularity in the field of resolution. Introduction of the output gamma corrector 3 of the video signal at the output of the device improves the accuracy of separating the video signal of the object from the background.

Claims (3)

Invention Formula 1, a device for separating a video signal of an object from the background, comprising a background component suppression unit, the output of which is connected to the first input of the first signal multiplier, characterized in that, in order to improve the accuracy of the object video signal, an output gamma corrector is entered, a two-channel compensating signal generator and a second signal multiplier, whose first input is a video signal input, the output of the second signal multiplier is connected to the input of the background component suppressor unit, and the first and Torah two outputs. channel generator of the compensating signals are connected to the second inputs of the first and second transistors respectively. signal multipliers, the output of which is connected to the input of the output gamma corrector.  t 2. The device according to claim 1, about tl and h a-: yusch e e so that the two-channel generator of compensating signals / contains a master oscillator, which contains serially connected cyt-iMaTop and respectively the first and second gamma correctors, while the inputs of each of the adders are connected to the outputs of the master oscillator, and the output of each of the gamma correctors is the output of a two-channel generator of compensating signals. 3. The device according to claim 2, about aphids This is due to the fact that the master oscillator is made in the form of a voltage generator of a saw-tooth and parabolic form of horizontal and frame frequencies,  Output