SU473322A1 - Television device for measuring geometrical parameters of objects - Google Patents

Description

one

The invention relates to television technology.

A television device is known for measuring the geometrical parameters of objects, comprising a television camera, one of the outputs of which is connected to a video monitor, a comparison unit connected by an output to a video monitor, and one of the inputs simultaneously to a voltage source and an additional comparison unit, the second input of which is connected with a sawtooth generator, the output of the additional comparison unit being connected to the indicator through a series-connected coincidence unit, the second input of which is connected to a pulse generator, a counter and a computing device.

Uncorrected geometric distortions of the deflecting system of the tube and the tube itself reduce the measurement accuracy.

In the proposed device, in order to increase the measurement accuracy, the second output of the camera is connected to the second input of the comparator unit via a selector, a decoder and an integrator.

Diagram of the device shown in the drawing.

The device contains a television camera 1, a selector 2, a decoder 3, an integrator 4, a video monitor (VKU) 5, block

Comparison 6, sawtooth generator 7, additional block 8, pulse generator 9, Comparison block 10, counter 11, Computing device 12, indicator 13. Variable resistance 14

connected to a direct current source E.

The device works as follows.

TV camera creates on screen

 image of objects falling into

lens field of view. The coordinate of the object of interest can be found by trigonometric transformation of its coordinates on the image of the BUD.

To determine the coordinate of the object on

image, an electronic marker is inserted into the image. It is formed by comparing the voltage from a moving contact of variable resistance to a voltage, the form of which is determined by the law

the scanning of the electron beam of the transmitting tube, which depends both on the shape of the current in the deflecting coils, and on the geometry of the deflecting system and the tube. In this case, the co-ordinate coordinate is fixed with the help of an additional unit of comparison.

With the help of variable resistance 14, the reference voltage is introduced in conjunction with the voltage from the integrator's output, repeating in form the law of beam deflection to the target of the tube. The marker is formed in

Comparison unit 6. When combining the 1marker and the image of the MOMeiiT object, the voltage in the bsch of the comparison about the co-ordination of the line scan is reduced. However, this point is only required to form a marker. to obtain a reference that corresponds to the true coordinate of the object, OH-or-naltr-tion is introduced into the complementary OLOK of comparison, then it interacts with a linearly varying voltage (synchronous with the sweep ;.

The result of the interaction is the impulse formed at the moment when the P2-I line pacipa is expanded. The actual coordinate of the object on the target of the tube is fixed irrespective of the characteristic of the unfolded sysgema. For proper operation of the device, it is necessary to apply a voltage b, corresponding to the shape of the transmitting tube sweeping fusion, for this pulses from the selector 2, modulated in time according to the beam sweep law, are converted into analog step voltage in the decoder.

In order to comprehend the measurement accuracy of the step, the recoverable sweep function is intertwined in the intervals between the risks of a scale table using an integrator at the output of the decoder. 1, the tuning is applied to the integrator, which is used to achieve an approximation of the unfolding function with a higher degree of accuracy compared with the standard form of its representation. The time factor of such an integrator is selected from the approximation condition of the recoverable evolving function of the direct adjoint to the function on .kra x.

An additional comparison unit 8 fixes the image coordinate of the object in the form of a time interval. Transform

however, conditioned by the corresponding three-sided dependences, are most easily solved by digital technology. Therefore, your time interval is filled with pulses from the generator Y, the number of which is recorded by the counter li. This number is the input value for the computational device LiiJa.

As pulses from the generator E, filling the specified interval, can be served by the horizontal sync pulses in the case of reflecting the coordinates of an ojek1a along the vertical axis of the raster or high-frequency

pulses synchronized by sync pulses when measuring the object coordinates along the horizontal raster axis. With the computational device, the number goes to indie; - .ator result.

i 1 p with d m e T inventions

A television device for measuring geometric T1 parameters of objects that contains a camera, one of the outputs of which is connected to a video controller. A device, a comparison unit that 11 connects to an output to a video control,; th device, and one of the inputs

auxiliary unit and an additional unit, the second input of which is connected to the sawtooth voltage generator, in addition to the output of the additional comparison unit: connected to the indicator in series

A matching match, the second input of which is connected to a pulse generator, is a counter that includes a number of devices, characterized in that, in order to improve the measurement accuracy, the second camera output connects it to the second input of the comparison unit through a selector, decoder and integrator.