SU995378A1 - Device for selecting video signal from given complex-shape figure - Google Patents

Description

The invention relates to television technology and can be used in the equipment for the quantitative analysis of the geometric parameters of the images of objects, in particular for the rapid analysis of the particle size distribution of active materials, ores.

. A device for selecting a video signal from a predetermined figure of complex shape, containing a television} is known. a sensor whose output is connected to the first inputs of the first element AND of the recording control and the element And of the read control, the second element And of the control, the element OR of the read element, or the start of the selection through a series-connected normalization unit of the amplitude of the video signal and the unit of delay for the period of horizontal scanning , on the first input of which a selection start signal is applied, and the second input is connected to the output of the first control AND element, the second input of the read control AND element is connected to the first output ervogo shift register which is connected to a second input of the first AND element and the first write control clock generator controlling input

pulses, the output of which is connected to the first input of the OR element and to the first input of the OR element, whose outputs are connected respectively to the clock inputs of the first shift register and the second shift register, and the second inputs of the OR element and the OR element are respectively connected

10 with the input of the delay unit for the horizontal scanning period and with the output of the amplitude rationing unit of the video signal, the output of which is also connected to the third input of the first recording control unit, the third input of the OR trigger of the selection is given to the frame synchronization signal and the output through the back edge driver pulse is connected to the asynchronous input of the first pepe shift register, the synchronous input of which is connected to the second output of the second sddyga register through the second control element AND, the synchronous input of which is soy and 25 with the output of the first shift register, the second input of the second control element AND of the recording and the second control input of the clock generator received a lower sync signal of synchronization 11. The main disadvantage of the known device is the low selection accuracy, which is explained as follows . The horizontal sweep duration of the television sensors is not constant due to a change in the frequency of the network and a discrete change in the length of the rows during the half-frame of the decomposition. Experimental measurements show that the fluctuations in the average time of the Horizontal scan during the half-frame reach zero. Therefore, when comparing line signals with a delay block signal configured for a certain period of full-time% support, spurious coincidence pulses appear in the comparison circuit. Under non-favorable conditions, the pulses are delayed by the chord of the given object and the chord of the neighboring object on the left | A false coincidence pulse can form, and the selection device begins to select the chords of the neighboring object. Therefore, the resolution of the device is defined as 1: 2-nd55 0 Objects, where 50. The MKS is a useful part of the standard horizontal scanning, 0.2 MSC is the minimum, the allowable distance between the objects, at which reliable selection of the specified img pulses occurs. And since most transmitting television tubes have a resolution of at least 500 objects, the known devices do not allow them to fully utilize their capabilities. The purpose of the invention is to improve the accuracy of selection. The goal is achieved by the fact that in a device for selecting a video signal from a given figure of complex shape, containing a clock pulse generator (GTI), a serially connected television sensor, a video signal amplitude rationing unit and an AND-OR-OR element sequentially connected to the first and second shift registers, as well as the first pulse front driver, a digital-to-analog converter (D / A converter), an RS trigger and a second rear-front pulse driver, with the GTI output connected to the synchronization input the first and second shift registers and through the DAC with the corresponding input of the television sensor, the output of the amplitude rationing unit of the video signal is connected to the information inputs of the first and second shift registers through the first back edge of the pulse to the S-input of the RS flip-flop, and also to the first input of the second driver the back edge of the pulse, to the second input of which the direct output of the RS flip-flop is connected, the output of the second shaper of the rear edge of the pulse is connected to the first R-inputs of the flip-flops of the first shift register and to watts ring R-inputs of the second shift register triggers inverse output RS-flip-flop is connected to the second B-inputs of the first flip-flops of the shift register, the output of the second shift register through an AND-OR-OR coupled to the R-input of RS-tryggera. FIG. 1 shows a structural electrical circuit of a device for selecting a video signal from a given complex figure. Hai of FIG. 2 - two objects, one of which is given and has a complex shape. A device for selecting a video signal from a given complex shape contains a television sensor 1, a block 2 normalizing the amplitude of a video signal, a digital-to-analog converter 3 (DAC), a 4-clock pulse generator (GTI), the first back edge generator 5, the second back leading edge driver b, the first shift register 7, the second shift register 8, the element AND-OR-OR 9, the RS flip-flop 10.h The device works as follows. The total period of the shift of the recorded pulses into the first and second registers 7 and 8 of the shift is equal to the period of the sci. sweep and is determined by one source - a generator of 4 clock pulses. Therefore, changes in the frequency of the 4-clock pulse generator result in equal changes in the shift and horizontal scan periods, which allows the resolution of the device to be brought closer to the capabilities of a television transmission tube. The selection device uses shift registers in which the shift of the recorded pulses, such as logic 1, is carried out by the clock frequency. The number of flip-flops in shift registers is determined by the required accuracy of recording chord lengths, for example, using standard line scanning, the row length is 64 µs, the useful part is 50 µs (minus the horizontal damping pulses), therefore, the maximum object chord length can be 50 µs If the accuracy of recording such a chord is 0.5%, i.e. igg of the chord duration, the number of triggers in the register should be 200, with the register shift period being equal to the horizontal scanning period (Tiei, 25 μs). If in registers 7 or 8 shift to write for example a chord with a duration of 5 x, 5 1I1SS ie En - :; r-h200 20 logical units, Ei MKS then at the output of the last trigger through the horizontal scanning period of 1, which is equal in duration to 20-0.25 MKS. . When the selection device is turned on, the triggers of the shift registers 7 and 8 are in the zero state, and the RS flip-flop 10 is in the unit slot; The appearance of a given object in the carr (figure 2) causes a scan of row 1 and. the video impulse of object chord located on the same line from the output of block 2 of the amplitude video signal normalization goes to the information inputs of shift registers 7 and 8 and sets the triggers corresponding to the length of the chord, registers 7 and 8 of shift in a single spacing during recording. At the end of the video impulse, the chord of the object B gives the second interpreter a short signal-1 1 to the first R-inputs of shift registers 7 and 8. The R-inputs of the 8 shift register of the selected signals receive signals of logical 1 from the second bis generator of the triggers of the shift register 7, which were set to one unit when writing the signal of the object B chord, and return the shift register 8 of the selected signals to the initial zero condition. The signal from the second shaper 6 triggers the shift record register 7 is switched to the zero position after a time determined by the delay of its flip-flops (flip time), as well as the R-inputs of the shift register triggers 7 are turned on for the logic 1 signals according to the scheme OR different from the shift register 8 of the selected signals, where the R inputs of the triggers for the signal Jaotic 1 are switched on according to the scheme I. Thus, when setting the triggers of the registers 7 and 8 of the shift to the zero state, the recorded chord pulse of object B is erased. With further scanning line 1, a video impulse of a given object appears (marked with a stroke in figure 2), which from the output of block 2 of the amplitude rationing of the video signal is recorded in shift registers 7 and 8, and also fed to the inputs of the formers 5 and b and the first input of the AND element -OR-OR 9. The identification of an object in the device is carried out after the selection trigger signal, which is applied at the moment of the first chorus appearance of the desired object. BEFORE the occurrence of this signal, the leading front of any chord, formed by the second driver b, falling on the R-inputs of shift registers 7 and 8, sets the riggers that were Hc1 in position 1 when recording the chord, to the zero state. During the sweep of the impulse chord of a given object, the impulse to start the selection passes through the AND-GILI-OR 9 element at the R input of the RS flip-flop 10 and sets it to the zero position. From the direct output of the short-circuit trigger 10, the logical O signal arrives at the input of the back edge of the pulse forcing unit and prohibits the passage of the falling edge of the given chord signal through it to the shift registers 7 and 8. From the inverse output of the RS flip-flop 10, the signal of logical 1 is applied to the second R input of the flip-flops of the shift register 7. And it sets the epo to the initial zero state. Back. the front of the recorded chord signal is allocated by the rear shaper 5 to the S input of the pulse front and the RS flip-flop 10, returning it to the one state. Thus, the chord signal of a given object remains in the shift register 8 of the selected pulses, but is erased from the pre-write shift register 7. When scanning the following line 2 in the shift registers 7 and 8, the signal of the object chord B is first recorded, then the information inputs of the shift registers 7 and 8 from the output of the amplitude normalization unit 2 of the video signal receive the signal of the specified object. Simultaneously, at the output of the shift register 8 of the selected signals, the signal / chords of line 1 of the specified object appear, since the generator 4 clock pulses arrive at the synchronization of the shift registers 7 and 9 and shift the chord signals recorded in the registers by the horizontal scanning period. The chords of row 1 from the output of shift register 8 and the chord signal of a given object of row 2 from block 2 of the amplitude normalization of the video signal are simultaneously fed to the second and third inputs of the AND-OR-9 element. At the output of the AND-OR-OR 9 element, a coincidence pulse appears, which enters the R input of the RS flip-flop 10 and switches it to the zero state, thereby blocking the back-front driver 6 to pass the falling edge of the signal chords of line 2 of a given object to the first R-inputs of shift registers 7 and 8, shift register 7 is returned to the zero position by a logical signal 1 from the inverse output of the RS flip-flop 10, and the last one is set to the one state by the falling edge of the 2-chord signal of the specified 2; object through the imaging unit 5 of the trailing edge of the pulse. The video pulses of the chord of the 2-specified object string remain only in the shift register 8

selected pulses. The coincidence signal from the output of block 2 of the amplitude rationing of the video signal and the signal from the output of shift register 8 determines the connectivity of the chords of a given object, since it arrives before the falling edge of the chord of a given object and sets the shift register 7 to the zero position. There is no match for an unset impulse object, so the hind fronts of the egche chord through the second driver b set the chords of the triggers of registers 7 and 8 that turned over for the length of jHocTb, zero shift, and in the shift register 8 only O triggers are set to 0 which from the corresponding triggers of the register .7 shift filed - .: logical signal 1.

The erasure of the signal in register 8 of the corresponding chord of the unspecified object is performed as follows. When recording the chord of an unset object into the shift registers 7 and 8, a certain number of their flip-flops are set to position 1 (this number is determined by the length of the recorded chord), the falling edge of the recorded chord formed by the second driver b is fed to the first of the 1i-inputs of the shift register 7 and to the first R-inputs of all the triggers of the shift register 8, the R-inputs for logical 1 being connected according to the AND scheme, therefore only those triggers of the shift register 8 at R-inputs are set to which the logical 1 rear edge is set to zero. chord coincides with a signal of logical 1, postupayuischh with respective outputs of flip-flops. shift register 7, so shift register 7 is set to. the zero position, and in the shift register 8 to the zero position, only the triggers corresponding to the chord of the returned object are set. The coincidence time of logical 1 on the R-inputs of the triggers of the shift register 8 is determined by the flipping time of the triggers of the shift register 7.

Similarly, the recording of chord signals is performed on all subsequent scan lines of the frame. In the case of a complex form (dissection), it is given. An object in the shift registers 7 and 8 is written to the chord signal of each part of the object (Fig. 2, lines 7-13 dash dashed lines). The output of the device circuit is

the output signal from the register in the shift of the selected signals. The signal that the chords are located in the shift register 8 is the impulse of coincidence of the video impulses of the direct and delayed chords.

The proposed device for selecting a video signal from a given complex shape allows the device to be approached up to the disruptive capacity of a television transmission tube, which improves the accuracy of selection.

Claims (1)

1. USSR author's certificate No. 653771, cl. H 04 N 7/18, 10/06/76 (prototype).