RU2042201C1 - Coder of videosignal - Google Patents

Abstract

FIELD: automatics, computer engineering. SUBSTANCE: insertion of working storage, multiplexer, frequency divider and flip-flop expands functional capabilities of coder of videosignal. EFFECT: expanded functional capabilities of coder. 1 dwg

Description

 The invention relates to automation and computer technology and can be used in vision systems.

 The known device for object recognition [1] contains a television sensor, a threshold unit, a delay unit, a coordinate determination unit, a pulse selection unit, a coupled chord selection unit, an analyzer, a registration unit, and terminals for supplying frame and horizontal sync pulses. As a result of converting the video signal into a two-stage one and delaying it for one line in the coordinate determination unit, the first mismatch pulse is allocated from the current and delayed signals in the upper part of each of the analyzed objects, which enters the pulse selection block. In the block of selection of related chords, mutual coincidence of adjacent lines is highlighted. The result of the analysis through the analyzer is issued to the registration unit.

 The specified device has insufficient functionality, in particular, can not determine the coordinate of the center of gravity of the figure.

 Another known device for encoding a video signal [2] comprises a television video signal sensor, a threshold element, the video signal sensor being optically coupled to the object, a sweep generator, a clock generator, a line counter, the first and second element NOT, the first and second elements AND, the first and second counters clock pulses, the first, second and third key blocks and a summing block. As a result of converting the observed object into a video signal and encoding it into a two-stage “0” and “1” threshold element using the counters and control devices, the coordinates of the video pulses of the scan lines are output at the output of the third key block, the sizes of the video pulses of the scan lines are output at the output of the second block of keys, and at the output of line counters, the number of the current line.

 The disadvantage of this device is also a lack of functionality, since it does not allow you to form the coordinates of the center of gravity of the chords of the image of the object, as well as to find the center of gravity of the image of the object.

 Closest to the proposed is a device for encoding a video signal [3] containing a sweep generator, a television video signal sensor optically coupled to the object, a line counter, a filter, a clock generator, three counters, a threshold element, a switch and an adder. In this device, the coordinates of the center of gravity of the chords of the image object of each row are formed. The device also allows you to get chord size codes and line codes of these chords.

 Analysis of the device showed that it also has insufficient functionality, because it does not allow to find the center of gravity of the image of the object.

 In vision systems, tasks are set, such as control and regulation, measurement and determination of position, and a number of others. For their effective solution, it is necessary to choose the minimum set of features containing the maximum amount of information about the object. One of these signs is the coordinate of the center of gravity of the image of the object. Its universality lies in the fact that it is invariant to the position of the object in the field of view of the television video signal sensor.

 The drawing shows a structural diagram of the proposed device.

 The device comprises a sweep generator 1, a television video sensor 2 optically coupled to object 3, a 4 line counter, a threshold element 5, a clock pulse generator 6, a frequency divider 7 into two, the first 8, second 9 and third 10 counters, the first 11 and second 12 triggers, the first multiplexer 13, the switch 14, the second multiplexer 15, the adder 16 and the RAM block 17.

 The device operates as follows.

 The video sensor 2 of the video signal under the control of the sweep generator 1 converts the image of the presented object 3 into a video signal that is supplied to the threshold element 5. After quantization to two levels “0” and “1”, the video signal is fed to the counting input of the first trigger 11, which changes its state by the trailing edge of the pulse (transition "0" "1" of the video signal), and the control input of the first multiplexer 13, which when "0" connects pulses from the clock generator 6 directly to the output, and when "1" through the frequency divider 7 into two. Thus, the third counter 10 counts the pulses from the clock generator 6 until the time when the video signal has a level of "0", and every second when the level is "1", until the first trigger 11 changes its state on the trailing edge video signal and do not prohibit the calculation of their number. The contents of the third counter 10 corresponds to the coordinate of the middle of the chord of the image of the object in this line. The start of the generator 6 clock pulses is carried out from the generator 1 sweep.

 The size of the current image chord is formed in the first counter 8, which counts the number of pulses from the clock generator 6, while the video signal is in a high state. The number of the current line of the image is determined by the reading of the counter 4 lines, the input of which is connected to the second output of the generator 1 scan.

 What operation is performed by the RAM block 17 (writing or reading) and which addresses are connected to the address input of the RAM is determined by the fourth output of the sweep generator 1 (the output of the frame clock). Its inactive (high) state corresponds to the write mode in RAM, and the address inputs are connected through the second multiplexer 15 to the output of the 4-line counter. Data input block 17 RAM come from the output of the third counter 10.

 The second trigger 12 is designed to wait for the first high-level video signal, by which it is set to a single state, which stores in the switch 14 the number of the first line of the image of the object coming from the counter of 4 lines.

 The second counter 9 counts the size of the image of the object vertically by counting the number of video signals with a high level. The contents of the switch 14 and shifted by one bit to the right (which corresponds to the operation of dividing by two), the contents of the second counter 9 are summed in the adder 16 and fed to the first input of the second multiplexer.

 At the end of the frame, the signal at the fourth output of the sweep generator 1 becomes active (low) and the output of the adder 16 reads the line number corresponding to the middle of the image of the object, which is also the address supplied through the second multiplexer 15 to the address inputs of the RAM block 17, at which the coordinate is read the center of gravity of the chord image of the object.

 A device for encoding a video signal is implemented on microcircuits of the КР 132, КР 531, КР 555 and КР 597 series. An industrial KTP-64 television camera was used as a television video signal sensor.

 The proposed device allows to obtain codes of the current line, the coordinates of the center of gravity of the object image chords, a quantized video signal, chord size codes, the line number code of the middle image of the object, the vertical image size code of the object image and the coordinate of the center of gravity of the chord corresponding to the middle of the image of the object.

Claims (1)

 A device for encoding a video signal containing a sweep generator, the first, second and third outputs of which are connected respectively to the inputs of a clock pulse generator, line counter and television video signal sensor, the output of which is connected to the input of a threshold element, the output of which is connected to the input of the first trigger and the counting input of the first counter and is the first output of the device, the output of the clock generator is connected to the clock input of the second counter, the output of which is the second output of the device two, a switch whose output is connected to the first input of the adder, the third counter, the output of the line counter is the third output of the device, characterized in that a RAM unit, two multiplexers, a frequency divider, and a second trigger, the input of which is connected to the output of the threshold element, are inserted into it and the output with the first input of the switch, the second output of which is connected to the output of the line counter and the first information input of the multiplexer, the second information input of which is the fourth output of the device and is connected to the adder, and the clock input with the fourth output of the sweep generator and the clock input of the RAM block, the information input of which is connected to the multiplexer output, the address input to the output of the third counter, which is the fifth output of the device, and the output is the sixth output of the device, the input of the frequency divider is connected to the output of the clock generator and the first information input of the multiplexer, and the output with the second information input of the multiplexer, the control input of which is connected to the output of the threshold e ementa, and the output to the counting input of the third counter, a control input coupled to an output of the first flip-flop.

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