SU1385331A1 - Television device for detecting moving objects - Google Patents

Abstract

The invention relates to TV. The purpose of the invention is to increase the likelihood of detecting moving objects. The device contains a TV camera 1, a synchro generator 2, a threshold unit 3, elements 4 and 5, a memory block 6, an element. OR 7. Three D-triggers (T) 8-10 have been introduced. Sync generator 2 contains r-11 pulses, shaper 12 line and frame sync pulses, dividers (D) 13 and 14 frequencies, counters 15 and 16. As the TV-camera beam travels along the row, the sampling pulses received through divider 14 to counter 16, change The state of the latter is after every K pulses. K-ratio division of D 14. The line is divided into sections, each of which

Description

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corresponds to a certain state of the counter 16. The same happens when the beam moves during a vertical sweep. The frame is divided into horizontal stripes with the help of D 13 and counter 15. The raster is divided into rectangular sections, each of which corresponds to a certain state of the counters 15 and 16, and hence a certain cell of the block 6, Before starting operation T 8- 10, which form the shift register, are located in O. The Start signal sets T 8 to 1. The next HR sync pulse sets 1 T 9 and resets T 8. A high level from T 9 passes through unit 7 to the recording control input and holds the block 6 in recording mode. On info the input is fed from the inverse output T 9, blocks 4 and 5 are blocked. The memory of block 6 is cleared. 1 Il.

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The invention relates to the technique of visualization and can be used to detect moving small-sized objects against a fixed background.

The purpose of the invention is to increase the detection rate of moving objects.

The drawing shows the structural electrical circuit of a television device for detecting moving objects.

A television device for detecting moving objects includes a TV camera 1, a synchronous generator 2, a threshold unit 3, element WA 4 and 5, a block 6 of memory, an element OR 7 and three D-flip-flops 8.9 and 10. At the same time, the synchronous generator 2 It contains a generator of P pulses, a 12 line and frame sync pulse shaper, two dividers 13 and 14 frequencies and two counters 15 and 16.

The device works as follows.

When the beam of the transmitting television camera 1 moves along the row, the sampling pulses arriving through the second divider 14 to the second counter 16 change the state of the latter after every K pulses, where K is the division factor of the second divider 14. The string is thus divided into sections, each of which corresponds to a certain state of the second counter 16. The same 35 occurs when the beam moves during a vertical scan. The frame is divided into horizontal stripes using the first divider 13 and the first counter.

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15. As a result, the whole plant turns out to be broken into rectangular sections, each of which corresponds to a certain state of the counters 15 and 16 and a certain cell of the memory block 6. Moreover, when the beam sweeps through each such segment, the address of the cell corresponding to this segment is set at the address inputs of the block in the memory.

Before starting, the D-flip-flops 8, 9 and 10, which form the shift register, are in O. The Start signal sets the D-flip-flop 8 to 1. The next frame sync pulse sets 1 to the D-flip-flop 9 and resets to D the D-flip-flop 8. A high level from the output of the D-flip-flop 9 passes through the OR element 7 to the recording control input and holds the memory block 6 in the recording mode. In this case, the information input O is fed from the inverse output of the D-flip-flop 9. This same potential blocks the operation of the elements 4 and 5.

Thus, O are recorded in all cells, i.e. the memory block 6 is cleared.

After the next frame sync pulse arrives, D-flip-flop 10 switches to 1, and D-flip-flop 9 to O. The high level from the output of D-flip-flop 10 permits the passage of pulses from threshold block 3 through AND 4 to OR 7 and further to recording control input . In this case, the information input of the memory block 6 is supplied with 1 from the inverse output of the D-trigger 9. Thus.

1 is recorded only in those cells of the memory that correspond to the raster areas containing the image of objects both moving and non-moving. Element AND 5 is blocked by a low level from the inverse output of D-flip-flop 10. After the next frame sync pulse arrives, D-flip-flop 10 switches to O and resolves the operation of AND 5 element. At the same time, a low level and a block 6 memory works in read mode.

The pulses from the output of the threshold block 3, corresponding to the images of objects in the solution, arrive at the input of element 5. However, at these moments, the cells in which 1 is written are polled, and the signal from the inverse output prohibits the passage of pulses to the output of element AND five.

Subsequent frame sync pulses from the output of sync generator 2 do not change the state of D-flip-flops 8, 9 and 10, therefore, if there is a moving object in the field, after some time, the value of which depends on the object moving speed and the size of the raster plots , which corresponds to 1 in the memory cell, to the section with O. At this moment, the high level from the inverse output of memory block 6 permits the passage of pulses from the threshold block 3 and an output signal appears at the output of the AND 5 element, notifying about That is, in the field of view is a moving object.

Claims (2)

1. A television device for detecting moving objects containing a serially connected synchro generator, a transmitting television camera and a threshold unit, the first and second elements AND, the memory block and the OR element, characterized in that, in order to increase the weight o 50 five 0 five 0 B Q detection of moving objects, three D-triggers are introduced, the gating inputs of which are combined and connected to the output of sync clock sync pulses, the first, second and third D-triggers, the first AND element, the OR element and the memory block are connected in series between the common bus and the first the input of the second element And whose output is the output of the video signal, the setup input of the first D-flip-flop is the trigger input, the inverse output of the second D-flip-flop is connected to the second input of the second And element and the information The th input of the memory unit, the D-input and the inverse output of the third D-flip-flop are connected respectively to the second input of the OR element and the third input of the second And element, the fourth input of which is connected to the output of the threshold block and to the second input of the first And element, The clock output and the bit outputs of the address signal of the synchronous generator are connected to the corresponding inputs of the memory unit. 2. The television device according to claim 1, characterized in that the synchronous generator contains serially connected pulse generator, shaper horizontal and frame sync pulses, the first frequency divider and the first counter, as well as the second connected frequency divider and the second counter, and the pulse generator output is connected to the input of the second frequency divider and is the clock signal output of the sync generator, the first and second outputs of the horizontal and frame sync impulse generator are connected to the setup The inputs of the second and first counters, respectively, are the outputs of the horizontal and frame sync pulses of the synchronous generator, respectively, the bit outputs of the address signal of which are the bit outputs of the first and second counters.