SU1665546A2 - Television device for detection of moving objects - Google Patents

Abstract

The invention relates to a technique of television and can be used to detect moving small objects against a background of moving objects. The purpose of the invention is to provide the possibility of detecting moving small objects on a moving background with objects. A television device for detecting moving objects comprises a transmitting television camera 1, a threshold unit 2, the first and second elements AND 3, 4, a block 5 of memory, the first element OR 6, the first, second and third D are triggers 7-9, the generator 10 pulses , shaper 11 lowercase and personnel pulses, first and second dividers 12, 13 frequencies, first and second counters 14, 15. This goal is achieved by introducing third elements AND 16, fourth element AND 17, second and third elements OR 18, 19, first and second additional counters 20, 21, elements Or - 22, the first latch 23, the second flip-flops 24, a decoder 25, a key 26, a comparison unit 27, comparison element 28 1 yl.

Description

The invention relates to a technique of television, can be used to detect moving small objects against a background of moving objects and is an improvement of the invention according to the authors. St. No. 1385331.

The purpose of the invention is to provide the possibility of detecting moving small objects on a moving background with objects.

The drawing shows a block diagram of a television device.

A television device for detecting moving objects comprises a transmitting television camera 1, a threshold unit 2, a first 3 and a second 4 elements AND, a memory block 5, a first element OR 6, a first 7, a second 8 and a third 9 D-flip-flops, a pulse generator 10, shaper

11strochnye and human impulses, the first

12 and the second 13 frequency dividers, the first 14 and the second 15 counters, the third elements And 16, the fourth element And 17, the second 18 and the third

19 elements OR, first 20 and second 21 additional counters, element OR - NOT 22, first trigger 23, second triggers 24, decoder 25, key 26, comparison block 27, comparison element 28.

A television device for detecting moving objects operates as follows.

In the initial state, the D-triggers 7-9, which form the shift register, are in the zero state, the additional counters 20 and 21 are reset. Input D of the first D-flip-flop 7 is connected to the common bus.

When the device is turned on, a pulse generator 10 is started, from the output of which the sampling pulses are fed to the input of the imaging unit 11 lowercase and frame pulses, to the input of the second frequency divider 13 and to the input C of the memory block 5. Lower pulses from the first output of the imaging unit 11 are fed to the input of the first frequency divider 12, to the input R (setting) of the second counter 15 and the information input of the key 26, from the output of which they are fed to the first input of the transmitting television camera.

The frame pulses from the second output of the imaging unit 11 are received at the first input (input of the shoe) of the first additional counter 20, which is zeroed, the input R (setting) of the first counter 14, the counting input of the second additional counter 21, where the second input of the transmitting television camera 1 is counted, Gating input C of the first 7, second 8 and third 9 D-flip-flops.

The pulses from the output of the first frequency divider 12 are fed to the second (counting) input of the first additional counter 20, where they are counted, and to the counting input of the first counter 14. The pulses from the output of the second divider 13 frequency go to the counting input of the second counter 15. As the transmitting television beam moves the camera 1 along the row, the sampling pulses arriving through the second divider 13 to the second counter 15, change the state of the latter after every K pulses, where K is the division ratio of the second divider 13. The string is thus split and the portions, each of which corresponds a certain state of the second counter 15. The same occurs when the beam motion at the vertical deflection. The frame is divided into horizontal stripes C using the first divider 12 and the first counter 14.

As a result, the entire raster is divided into rectangular areas, each of which corresponds to a certain state of the counters 14 and 15 and a certain cell of the memory block 5. Moreover, when the beam sweeps through each such segment, the address of the cell corresponding to this segment is set in the memory inputs of block 6. The zero code from the output of the second additional counter 21 goes to the corresponding second inputs of the comparison unit 27 and the decoder 25, with the result that the zero output of the decoder 25 sets a high level to the first inputs of the second flip-flops 24, transferring them to one state, to the first input first

the trigger 23, transferring it to the zero state, to the first input of the OR element - NOT 22, closing the fourth element AND 17, and to the second input of the third element OR 19.

A low level from the output of the first trigger 23 enters the fifth input of the second element I 4, closing it. A high level from the output of every second trigger 24 goes to the second input of the corresponding third element I15, opening it. The output signal (the current raster line number) of the first additional counter 20 in the parallel code is fed to the first input of the comparison block 27. The output signal (the current frame number) of the second additional counter 21 in the parallel code is fed to the second input of the comparison unit 27. Since the current value of the first additional counter 20 is greater than the zero value of the second additional counter 21, a high level signal is generated at the output of the comparison unit 27, which is fed to the control input of the key 26 and opens it. The output signal of the transmitting television camera 1 is fed to the input of the threshold unit 2. With each personnel sync pulse in the last line of the transmitting television camera 1, as a result of its translational motion, video signals are formed corresponding to a new raster line of the unfolded object plane.

The trigger signal is sent to the setup input S of the D-flip-flop 7, set to 1, and through the delay element 23 to the first input (zero input) of the second additional counter 21 to zero it. This signal 1. through the third element OR 19 is fed to the input D of the second D-flip-flop 8. Another (first) frame sync pulse sets the second D-flip-flop 8 to 1 and resets the first D-flip-flop 7, zeroed the first additional counter 20 and increases by one the current value of the second additional counter 21. After some time, from the output of the delay element 28, the delayed Start signal arrives at the first (zero) input of the second additional counter 21 and zeroes it. A high level from the output of the second D-flip-flop 8 passes through the first element OR 6 to the recording control input V and holds the memory block 5 in the recording mode. At the same time, the information input P of the memory block 5 is fed O from the hard output of the second D flip-flop 8. This potential blocks the operation of the second element I 4. Thus, all cells are written O, i.e. the memory block 5 is cleared.

After the next (second) frame sync pulse arrives, the third D-flip-flop 9 switches to 1, and the second D-flip-flop 8 to O. At the same time, the current value of the second additional counter 21 increases by one and becomes equal to one, and the first additional counter 20 also zeroes. The high level from the output of the third D-flip-flop 9 is fed to the first input of the first element And 3 and allows the passage of pulses from the output of the threshold unit 2 through the first element 3 to the first input of the first element OR 6 and further to the recording control input V 5 Lok memory. At the same time, the fourth input of the second element 4 and the information input P of the memory block 5 is fed 1 from the inverse output of the second D-flip-flop 8. Thus, the signal 1 is recorded only in those memory cells of block 5 that correspond to the raster sections containing the image of both moving and moving background objects located in the first frame of the image,

The second element AND 4 is blocked by a low level from the inverse output of the third D-flip-flop 9. Since the current value of the second additional counter 21 is equal to the high level at the first output of the decoder 25, which goes to the second input of the OR element - NOT 22, closing it the fourth element is And 17. At the same time, at the zero output of the decoder 25 a low level is established. At the output of the comparator unit 27, a low level signal is set, which is maintained during the sweep of the first and second rows of the memory raster 5, and a high level signal is set to the beginning of the sweep of the third row. Therefore, writing to the memory block 6 of the first line of the first frame of the image is performed starting from the third line of the memory block 5.

After the next (third) frame sync pulse arrives, the third D-flip-flop 9 switches and enables the second element AND 4, since from the inverse output of the D-flip-flop 9 a high level signal goes to the first input of the second element 4. At the same time, the recording control input V memory unit 5 is fed low from the output of the first element OR 6 and memory block 5 is operating in read mode. At the same time, the current value of the second additional counter 21 becomes equal to two, and the first additional counter 20 is zeroed. Therefore, a low level is set at the first output of the decoder 25, and a high level is set at its second output, which

arrives at the second input of the second trigger 24t and throws it to the zero state. The low level signal from the output of the second trigger 24i arrives at the second input of the third element And 16i, closing it.

As a result, the connection is broken between the first bit output and the frame input, respectively, of the first counter 14 and memory block 5. Since the first and second inputs of the element OR - NOT 22 receive low level signals, the output of the element OR - NOT 22 sets a high level, which goes to the second input of the third element And 17 and opens it. When the first line of the memory block 5 is scanned, the current value of the first additional counter 20 is zero, which does not exceed the value 2 supplied to the second input of the comparison block 27. Therefore, the output of this block 27 is set at a low level, which goes to the control input of the key 26 and closes it. As a result, the horizontal pulses through the key 26 are not received at the first input of the transmitting video camera 1 and therefore the scanning of the first line of the second frame of the image in the transmitting television camera 1 is not made.

Since the third element AND 16 is closed, the reading of the first line of the first frame of the image from memory block 5 does not produce- Ј. The low level seagal from the output of the first trigger 23 enters the fifth input of the second element I 4 and blocks its operation. In the second and third rows of the memory block 5, the current value of the first additional counter 20 is equal to one and two, respectively, which also does not exceed the value 2 of the output signal of the second additional counter 21 pulses. Therefore, at the output of the comparison unit 27, a low level of the output signal is maintained, which closes the key 26. Therefore, the raster sweep in the transmitting television camera 1 is not performed, and its zero output signal does not pass through the second And 4 element. the lines of block 5 of the memory of the current value of the first additional counter 20 is set to three, which exceeds the value 2, Coming to the second input of the block 27 of the comparison. Therefore, the output of this block 27 is set to a high level, which goes to the control input of the key 26 and opens it. Therefore, the line pulses through the key 26 are fed to the first input of the TV feed camera 1 and therefore the first raster line is scanned in the transmitting television camera 1. The pulses from the output of the threshold unit 2.

The corresponding images of objects in the first line of the raster of the transmitting television camera arrive at the third input of the second element AND 4. The high level signal from the fourth bit output of the second counter 14 enters through the open third element AND 16 to the fourth frame input of the memory block 5. Simultaneously, from the output of the third element AND 16, this signal goes through the second element OR 18, the open fourth element AND 17 to the second input of the first trigger 23 and transfers it to 1.

The high level signal from the output of the first trigger 23 is fed to the fifth input of the second element 4, and unlocks it. However, at these moments, those cells in which 1 is recorded are polled, and the signal from the inverse output of memory block 5, corresponding to the fourth line of the first frame of the image recorded in this block, enters the second input of the And 4 element and prevents the passage of pulses its third input, the output of the second element And 4, When you scan the fifth, sixth, etc. lines of the second frame of the image, the device operates in the same way. Subsequent, starting with the fourth, personnel sync pulses from the output of imaging unit 11 do not change the state of D-tripers 7–9, and the device operates in a similar way. Therefore, if in the field of view of a transmitting television camera there is a small-sized moving object on a moving background, then after some time, the value of which depends on the speed of the object relative to the background and the size of the raster dividing areas, the small-sized object moves from the area corresponding to 1 in memory cell 5 block, in the section with O. At this moment, a high level from the inverse output of block 6 enters the second input of the second element I 4 and permits the passage of pulses from the output of the threshold block 2 to the output And the second element 4. The appearance of the output signal reading the output of second AND 4 announces that the field of view of a television camera 1 is small-sized moving object on a moving background. When entering the second counting input of the second additional counter 21 p / 2 of the frame sync pulse, the current value of the second additional counter 21 pulses reaches the value n / 2 and this counter automatically resets. Therefore, at the zero output of the decoder 25, a high level is established, which is fed to the first inputs of the second flip-flops 24, moving them to 1 and opening

all third elements AND 16, to the first input of the first trigger 23, transferring it to O and blocking the second element AND 4, to the second input of the third element OR 19 and to the first input of the OR element - NOT 22, thus closing the fourth element AND 17 .

From the output of the third element OR, the signal is fed to the input D of the second D-flip-flop 8 and throws it to 1, since at the same time, n / 2 frame sync pulse arrives at the input C of this D-flip-flop 8. As a result, the cells of the memory block 5 are reset. After the next frame sync pulse (n / 2-M) arrives, the third D-flip-flop 9 switches 1, and the second D-flip-flop in O. Due to this, the next (n / 2) frame picture is written into the cells of memory block 5. When the next (p / 2 + 2) frame synchronization pulse arrives, the third D-flip-flop 9 switches to O and enables the second element 4 to work. As a result, the like-like sections of the image raster generated by the transmitting television camera 1, i.e. . (n / 2 + 1) -th image frame and recorded in the cells of block 5 of memory n / 2 image frame. In the future, the device works in a similar way.

Claims (1)

Invention Formula Television device for detecting moving objects on ayt. St. No. 1385331, characterized in that, in order to detect moving small-sized objects on a moving background with objects, n / 2 of the third And elements are introduced, where n is the number of lines of the image raster of the transmitting television camera, the fourth And element, the second and third elements OR , the first and second additional counters, the OR element - NOT, p / 2 second triggers, the decoder, the Key, the comparison unit and a delay element whose input is connected to the setup input of the first D-flip-flop, the output of which is connected to the D-input of the second D-flip-flop via the third OR element, and the output of the delay element is connected to the zero input of the second additional counter, to the counting input of which, as well as The first additional counter is connected to the zeroing input of the second output of the horizontal and frame pulses, the first input of which is connected to the first input of the transmitting television camera via a key, to the control input of which the output is connected d of the comparator unit, to the first input of which the output of the first additional counter is connected, while the outputs of the second additional counter are connected respectively to the second inputs of the comparator unit n the decoder, the zero output of which is connected to the first inputs of the first and n / 2 second triggers, the second input of the third element OR and the first input of the first element OR - NOT, to the second input of which the first output of the decoder is connected, the second and subsequent outputs of which are connected to the second inputs n / 2 of the second flip-flops, and the bit the outputs of the first counter are connected to the corresponding inputs of the memory unit through p / 2 third AND elements, to the second inputs of which are connected the outputs of the respective second triggers, and the outputs of the n / 2 third AND elements connected to the inputs of the second OR element, whose output and OR output - NOT connected respectively to the first and second inputs of the fourth element I, the output of which through the second input of the first trigger is connected to the fifth input of the second element I, while the output of the first frequency divider is connected to the counting input of the first th additional counter.