KR100802530B1 - Ems monitoring system using the moving picture - Google Patents

Abstract

An EMS monitoring system using a video is provided to improve the accuracy of the EUT by using an automated system without determining the malfunction of a test product with the naked eye, and improve convenience in an after-sales service by converting an image of photographing the exterior of the test product into a digital signal and storing the image in a hard disk. An EMS(Electro Magnetic Susceptibility) monitoring system(100) using a video comprises a computer(102) and a vision board(104). The computer stores a reference video for an EUT(Equipment Under Test)(300) in a digital signal form. The vision board converts an actual image, inputted from a camera(202) installed in an electromagnetic wave anechoic chamber(200), into a digital signal and outputs the digital signal to the computer. The reference image is that a normal operation state of the EUT is photographed in a still image form. The actual image is that the actual state of the EUT positioned in the electromagnetic wave anechoic chamber is photographed in a video form in a state that electromagnetic waves are radiated. The computer captures the actual image at regular intervals and generates plural comparison images. The computer compares the comparison image of the still image with a reference image screen and determined that the malfunction of the EUT occurs when a change of the image is generated.

Description

EMS monitoring system using the moving picture

1 is a block diagram showing a connection state of the monitoring system according to an embodiment of the present invention.

Figure 2 is a picture capturing the main screen for the execution of the monitoring system.

3 is a picture capturing a screen displaying the output state of the electromagnetic wave on the main screen.

4 is a graph measuring a change amount of an image in a motion monitoring state.

5 is a codec selection window for storing a video.

6 is a conceptual diagram illustrating an example of an apparatus operating at a constant cycle.

7 is a graph measuring a change amount of an image in a cycle monitoring state.

8 is a log recording window for recording the monitoring results.

9 is a block diagram showing a connection state of the monitoring system according to another embodiment.

<Explanation of symbols for the main parts of the drawings>

100; Monitoring system 102; computer

104; Vision board 200; Electromagnetic anechoic chamber

202; Camera 204; antenna

206; Emulator 300; EUT

The present invention relates to an EMS monitoring system using a video. More specifically, EMS monitoring using a video to determine whether the EUT fails in an electromagnetic environment by comparing the video of the EUT or emulator with a reference video while recording the video. It's about the system.

In general, in the case of an electronic control device, an electromagnetic wave characteristic test is mandatory test, and the electromagnetic wave characteristic test at this time is called EMC (Electro Magnetic Compatibility).

EMC is a general term for Electro Magnetic Interference (EMI) and Electro Magnetic Susceptibility (EMS). EMI stands for electromagnetic interference and EMS stands for electromagnetic resistance.

EMS is a test for evaluating the immunity ability of the built-in processor to withstand external electromagnetic waves.The test items are electrostatic discharge (ESD), radiation resistance (RS), electrical transient (EFT), surge, conduction resistance (CS), Power frequency magnetic field resistance (MF), voltage drop, and voltage dips / interruptions.

The EMS test requires the performance of electric and electronic devices to operate normally in a poor electromagnetic environment. Therefore, a condition for forming a uniform electric field in the area where the EUT (Equipment Under Test) is placed is required. In order to ensure the validity of the test, the test is carried out in an anechoic chamber.

Electromagnetic waves are radiated from an antenna formed on one surface of the electromagnetic anechoic chamber, and the radiated electromagnetic waves form a uniform electric field in the region of the EUT. In this case, the EUT is normally operated by the emitted electromagnetic waves, that is, the result is monitored as an image.

The tester monitors the EUT abnormality while visually confirming the image transmitted through the shield camera installed in the electromagnetic anechoic chamber. Such a test method has a problem in that the tester requires excessive observation power. In addition, if a problem occurs at any frequency due to continuous frequency sweep during the test, measurement results may be inaccurate since manual recording should be performed without a separate recording equipment.

In particular, when testing a device that repeats a predetermined operation according to a certain period, such as a car wiper or a rotating motor, there was a problem that can not accurately determine whether the malfunction due to electromagnetic waves can not accurately measure the operation cycle.

In addition, since the third party cannot monitor the test results made in a specific place, there is a problem that the new test should be doubled.

The present invention has been made to solve the above-mentioned problems, and when the electromagnetic wave is applied to the EUT or emulator, the moment when the abnormal situation occurs as a video recording and storing, and compare the stored video in the frame order to automatically compare the rate of change of the image It is an object of the present invention to provide an EMS monitoring system using a video that can determine whether an abnormality occurs.

The present invention for solving the above problems is a monitoring system for monitoring whether the EUT (Equipment Under Test) located inside the electromagnetic anechoic chamber causing malfunction due to electromagnetic waves emitted from the antenna, the reference image for the EUT is a digital signal A computer stored in the form; And a vision board for converting an actual image input from a camera installed inside the electromagnetic anechoic chamber into a digital signal and outputting the digital signal to the computer. The reference image is a still image of a state in which the EUT is operating normally. The real image is a video of the actual state of the EUT located inside the electromagnetic anechoic chamber in the state that the electromagnetic wave is emitted, the computer captures the actual image at regular time intervals to generate a plurality of comparison images, the comparison The image is a still image, and the computer compares the screen of the comparison image and the reference image with each other to determine that a malfunction of the EUT occurs when a change of the image occurs.

The computer extracts a predetermined portion from the reference image and the comparison image as a surveillance region, and extracts the extracted two surveillance regions and compares them with each other to determine whether the image is changed.

The computer compares any one or more of brightness, saturation, color, and contour of the surveillance region of the reference image with the surveillance region of the comparison image to generate an alarm when a change amount exceeding a certain ratio occurs. do.

The computer may store at least one of information on a frequency, an output, and a VSWR value of an electromagnetic wave at the time when the alarm occurs in synchronization with the comparison image.

According to another embodiment of the present invention, a monitoring system for monitoring an image of an EUT (Equipment Under Test) located inside an electromagnetic anechoic chamber causing malfunction due to electromagnetic waves emitted from an antenna, wherein the reference image for the EUT is in the form of a digital signal. A computer storing information on an operation cycle of the EUT; And a vision board for converting an actual image input from a camera installed inside the electromagnetic anechoic chamber into a digital signal and outputting the digital signal to the computer. The reference image is a still image of a state in which the EUT is operating normally. The real image is taken as a video of the actual state of the EUT located inside the electromagnetic anechoic chamber in the state that the electromagnetic wave is emitted, the computer captures the actual image for each frame to generate a plurality of comparison images, the comparison image As a still image, the computer extracts a change period of an image while comparing the plurality of comparison images and the screens of the reference image with each other, and the difference between the change period of the extracted image and a pre-stored operation period of the EUT is a predetermined ratio or more. If it is determined that a malfunction of the EUT has occurred The features.

When the computer compares the screens of the plurality of comparison images and the reference image with each other, the computer displays a time period in which the rate of change of the image increases from minimum to maximum and then decreases to minimum.

According to another embodiment of the present invention, a monitoring system for monitoring an image of whether an EUT (Equipment Under Test) located inside an electromagnetic anechoic chamber causes malfunction due to electromagnetic waves radiated from an antenna, wherein the reference image for the EUT is in the form of a digital signal. A computer stored as; A vision board for converting an actual image input from a camera installed inside the electromagnetic anechoic chamber into a digital signal and outputting the digital signal to the computer; And an emulator electrically connected to a component or a circuit installed inside the EUT to monitor the operation of the component or the circuit, and to perform a corresponding movement or light emission according to the operation of the component or the circuit. The image is taken as a still image of the emulator in the state that the EUT is operating normally, the actual image is taken as a moving picture of the actual state of the emulator in the state of electromagnetic radiation is emitted, the computer A plurality of comparison images are generated by capturing at a predetermined time interval, and the comparison image is a still image, and the computer compares the screen of the comparison image and the reference image with each other to change the image. It is judged to have occurred.

The computer compares any one or more of brightness, saturation, color, and contour of the surveillance region of the reference image with the surveillance region of the comparison image to generate an alarm when a change amount exceeding a certain ratio occurs. .

Hereinafter, an EMS monitoring system (hereinafter, referred to as a monitoring system) using a video according to an embodiment of the present invention will be described with reference to the drawings.

1 is a block diagram showing a connection state of the monitoring system according to an embodiment of the present invention.

As shown, the monitoring system 100 according to the present invention is installed outside the electromagnetic anechoic chamber 200, the computer 102 and the vision that can monitor the test results of the EUT (Equipment Under Test, 300) as an image Consists of a board 104.

The camera 202 and the antenna 204 are installed in the electromagnetic wave anechoic chamber 200, and the EUT 300, which is an object of the EMS test, is placed.

The vision board 104 converts an image signal transmitted from the camera 202 into a digital signal and transmits the digital signal to the computer 102. In general, since the video graphics card included in the computer 102 plays the same role as the vision board 104, it is not necessary to install a separate vision board 104 when using a general PC.

The vision board 104 may be provided with various types of interfaces that can be connected to various output terminals provided in the camera 202.

The computer 102 may be provided with an image processing apparatus, a memory, a hard disk drive (HDD), and the like, and a signal input from the vision board 104 is stored in an HDD in the computer 102.

In addition, the reference image of the EUT 300 to be tested is stored in the form of a digital signal in a memory or a storage device of the computer 102. The reference image refers to a still image of the EUT 300 when no electromagnetic wave is applied. In other words, when all the devices are operating normally, when the electromagnetic wave is radiated and malfunction of the device occurs, the operation of the screen is different from that of the reference image. You will notice the difference.

The electromagnetic anechoic chamber 200 is a space in which a plurality of absorbers are attached to an inner surface in order to realize the same environment in which electromagnetic waves propagate in free space, and electromagnetic waves radiated from the antenna 204 are transmitted to the EUT 300. Form an electric field for the immunity test.

The camera 202 is installed inside the electromagnetic wave anechoic chamber 200 to capture an internal image, and it is preferable to store the inside of the shielded case to block external electromagnetic waves.

There are two types of image capturing and output methods, the NTSC method in North America and the PAL method in Europe. In the present invention, all kinds of cameras can be used.

The EUT 300 subject to the EMS test mainly includes an automobile, an electronic product, a measuring device, and the like. When the frequency or output of electromagnetic waves radiated from the antenna 204 exceeds a predetermined range, the EUT 300 performs abnormal operation. It becomes visible.

As such, when the setting for the EMS test is completed, electromagnetic waves are radiated through the antenna 204. The electromagnetic wave immunity characteristic test of the EUT 300 is performed by the emitted electromagnetic waves, and the operating state (actual image) of the EUT 300 photographed by the camera 202 is transmitted to the monitoring system 100 in real time.

In addition, information of electromagnetic waves emitted from the antenna 204, for example, information such as frequency, output, and VSWR values are also transmitted to the monitoring system 100 in real time, and are synchronized with the photographed screen and stored.

Meanwhile, FIG. 2 is a picture capturing a main screen for executing the monitoring system, and FIG. 3 is a picture capturing a screen displaying an output state of electromagnetic waves on the main screen.

2 and 3, the actual image of the EUT 300 located in the electromagnetic anechoic chamber 200 is displayed in the center of the main screen, the menu item button and a shortcut icon is provided at the top.

In addition, an electromagnetic wave output information display window A is provided at the upper right to display the frequency, test level, monitor level, and output of the electromagnetic wave.

The bottom of the electromagnetic wave output information display window (A) is provided with a reference image display window (B) to display an image of the EUT 300 that is operating normally. The monitoring system 100 calculates the amount of change in the image by comparing the reference image with the actual image. The difference from the reference image is displayed in the image change display window C of the lower portion. For example, a value of 74.38% shown in the image change display window C of FIG. 2 indicates that the image has been changed by 74.38% from the reference image as a result of comparing the reference image with the actual image of the EUT 300.

In other words, the motion is changed by 74.38% compared to the motion shown in the reference image. The tester who is conducting the test may set the alarm to automatically turn on when the image changes by more than a certain ratio, and store the frequency, output, time, etc. when the alarm is turned on in the monitoring system 100.

In order to compare the reference image and the real image, the EUT 300 is photographed as a still image in the state where electromagnetic waves are not applied, and the reference image and the real image are compared at regular intervals. The time interval for the image comparison may vary depending on the type of test or the characteristics of the EUT 300.

In order to grasp the abnormal state of the EUT 300 by software, first, the appearance of the EUT 300 in the normal state is photographed and stored in the computer 102 as a reference image.

The monitoring system 100 of the present invention may increase data processing speed and efficiency by setting one or a plurality of monitoring regions for automatically monitoring a change of an image on a reference image and an actual image screen, and comparing them with each other.

When the EMS test is started while the reference image is stored, the camera 202 photographs the EUT 300 at regular intervals and outputs a signal for the actual image as a moving image.

The signal for the actual image is converted into a digital signal in the vision board 104 and sent to the computer 102. When storing the digital signal for the actual image in the computer 102, it is preferable to store it in the form of a compressed file such as MPEG.

The computer 102 determines how much change occurs while comparing portions of the reference image and the actual image, which are set as the surveillance region, at regular time intervals.

For example, if the time interval for image comparison is set to 0.1 seconds, a plurality of comparison images (still image form) by capturing the actual image (video form) of the EUT 300 displayed as a video on the main screen at 0.1 second intervals. ) The captured comparison images are compared with the reference images output to the reference image display window B one by one.

The EUT 300 displayed on the comparison image is different from the reference image due to electromagnetic waves radiated from the antenna 204. The computer 102 inside the monitoring system 100 compares the reference image with the reference image. Compare the differences.

There are many ways to determine how much change has occurred by comparing two images. In general, a method of determining whether there is a significant difference by comparing brightness, saturation, color, and contours with each other is used. do.

A method of detecting a change amount in two still images (a reference image and a comparative image) is a part to which the disclosed techniques can be applied, and a detailed description thereof will be omitted.

The investigator conducting the test may set a limit on the amount of change. For example, as a result of comparing the contours of the objects included in the two surveillance areas with each other, if a change of about 10% occurs, whether it is viewed as a change due to malfunction of the EUT 300 or as noise on the screen itself. Should be judged. This is because even if there is no malfunction in the EUT 300, a slight amount of image change may be detected due to the shaking of the camera 202 or the noise of the screen in the process of comparing the two images with each other. It is to.

Therefore, according to the characteristics of the EUT 300, the investigator sets an appropriate limit and sets it as a limit line for determining malfunction.

This setting is shown in FIG. 4, which is a graph measuring the amount of change in the image in the operation monitoring state, where a portion (abnormal state) showing the amount of change exceeding the red line change limit line (abnormal state) malfunctions of the EUT 300. It can be seen that the state.

In the motion detecting mode, the EUT 300 does not repeat the same movement at regular intervals, but determines whether the EUT 300 operates normally when intermittently or randomly. Therefore, it is possible to determine whether or not the malfunction by measuring only the amount of change of the image by simply comparing with the image displayed on the reference image.

As shown in FIG. 4, when the amount of change in the actual image exceeds a certain limit, the monitoring system 100 generates an alarm such as a sound or a warning light, and the tester generates an alarm to protect the EUT 300 when an alarm occurs. It may be set to stop radiation.

5 is a codec selection window for storing a video.

The monitoring system 100 may store a video signal input from the camera 202 in the form of a digital signal. The tester may select a proper codec suitable for his system and save the video file.

The saved video file may be used for verification or replay of the test.

This video codec selection is preferably made in the upper menu item of the main screen.

6 is a conceptual diagram illustrating an example of an apparatus operating at a constant cycle, and FIG. 7 is a graph measuring a change amount of an image in a cycle monitoring state.

As shown in FIG. 6, a device that rotates at a constant speed or reciprocates at a constant cycle may have a rotational speed or a reciprocating period due to electromagnetic waves.

For example, as shown in FIG. 6, it takes one second for a rotating arm (such as a wiper of a car) to reciprocate between two stoppers once, but the reciprocating time is changed when the electromagnetic wave is radiated to change the rotational speed of the motor. This can happen.

Therefore, it is necessary to monitor the change in the cycle of the reciprocating motion in addition to monitoring whether the change in motion has occurred as described above.

The monitoring system 100 may set a cycle detecting mode for monitoring the exercise cycle.

In the cycle monitoring state, the time taken to return to the same state is measured while comparing the reference image and the actual image in frame units (about 30 frames / sec). That is, the operation period (reciprocation cycle) of the rotary arm is extracted by calculating the time for returning to the left stopper (L ') after contacting the right stopper (L') with the rotary arm in contact with the left stopper (L).

To this end, a state in which the rotary arm reciprocates a certain section is taken and stored as a reference image, and at the same time, information on the operation cycle of the EUT 300 is also stored. And while taking a real video as a video to create a comparative image by dividing by frame, and compares with the reference image to measure the rate of change of the image.

Since the rotating arm moves along a certain path, the rate of change of the image will increase and decrease by a certain rate. That is, at the time of the reciprocating motion, the amount of change increases by a certain size as the image is rotated while the image which is almost not different from the reference image is displayed.

Then, when the opposite limit line (L ') is reached, the maximum change amount is displayed, and after that, the change amount gradually decreases and returns to the original position (L), and the change amount returns to zero again.

In this way, the monitoring system 100 recognizes a time period in which the amount of change in the image increases from zero to the maximum and then returns to zero again.

And the stored period for the EUT 300 and the operation period extracted from the actual image

In FIG. 7, the time point at which the change amount of the image exceeding the limit line is a time point for completing a reciprocating motion of one cycle.

Through this method it is possible to proceed with the electromagnetic resistance immunity test of the EUT 300 to rotate or reciprocate.

On the other hand, Figure 8 is a log record window for recording the monitoring results, and records the time when the electromagnetic wave immunity test and the alarm occurs and stored in a storage device (not shown) inside the computer 102.

9 is a diagram illustrating a connection state of a monitoring system according to another exemplary embodiment.

In order to determine whether the EUT 300 is malfunctioning due to the radiation of electromagnetic waves, it is preferable to directly photograph the appearance of the EUT 300 exposed to the electromagnetic waves in the electromagnetic anechoic chamber 200 as described above, but it does not appear in appearance. In order to determine whether an internal circuit is abnormal or the like, it is preferable to install a separate device connected to the internal circuit and the like to visually display the state of the internal circuit.

To this end, it is common to use an emulator 206 that is electrically connected to a component or a circuit installed inside the EUT 300 to monitor its operation.

The emulator 206 is provided with a connector and a port (not shown) that can be electrically connected to various components of the EUT 300, and is provided with a plurality of LED lamps (not shown) that emit light simultaneously with the operation of the various components. do. Therefore, when the EUT 300 malfunctions due to the radiation of electromagnetic waves, the LED lamp of the emulator 206 is turned on or the motor rotates abnormally. The camera 202 may perform such an emulator 206. By detecting whether the abnormal operation of the EUT 300 will be able to determine whether the malfunction.

In general, since the emulator 206 is manufactured to be compatible only with a specific EUT 300, the tester should have an emulator 206 suitable for the EUT 300 to be subjected to the EMS test.

Since the method of determining whether the EUT 300 malfunctions indirectly with the emulator 206 is also the same as described above, a detailed description thereof will be omitted to avoid duplication.

Although the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, the above-described technical configuration of the present invention may be embodied by those skilled in the art to which the present invention pertains without changing its technical spirit or essential features of the present invention. It will be appreciated that the present invention may be practiced as. Therefore, the above-described embodiments are to be understood as illustrative and not restrictive in all respects, and the scope of the present invention is indicated by the appended claims rather than the detailed description, and the meaning and scope of the claims and All changes or modifications derived from the equivalent concept should be interpreted as being included in the scope of the present invention.

According to the present invention, it is possible to improve the accuracy of the test by using an automated system without discriminating whether the test object to be subjected to the electromagnetic immunity test is visually inspected by the human eye, and the image of the test product is taken as a digital signal. By converting and storing the data on a hard disk or the like, it is possible to increase convenience of post management and search.

Claims (8)

A monitoring system that monitors visually whether the EUT (Equipment Under Test) located inside the electromagnetic anechoic chamber is causing malfunction due to electromagnetic waves radiated from the antenna. A computer storing the reference image for the EUT in the form of a digital signal; And a vision board for converting an actual image input from a camera installed inside the electromagnetic anechoic chamber into a digital signal and outputting the digital signal to the computer. The reference image is a still image of the state in which the EUT operates normally, and the actual image is a video of the actual state of the EUT located inside the electromagnetic anechoic chamber in a state in which electromagnetic waves are radiated. The computer generates a plurality of comparison images by capturing the actual image at regular time intervals, The comparison image is a still image, and the computer compares the screens of the comparison image and the reference image to each other, and when the change of the image occurs, the EMS monitoring system using the video, characterized in that the malfunction of the EUT occurs. . The method of claim 1, The computer extracts a predetermined portion from the reference image and the comparison image as a surveillance region, and extracts the extracted two surveillance regions and compares each other to determine whether the image is changed or not. Monitoring system. The method of claim 2, The computer compares any one or more of brightness, saturation, color, and contour of the surveillance region of the reference image with the surveillance region of the comparison image to generate an alarm when a change amount exceeding a certain ratio occurs. EMS monitoring system using still image. The method of claim 3, The computer monitors EMS using a still image, characterized in that for storing any one or more of the information on the frequency, output, VSWR value of the electromagnetic wave at the time of the alarm is synchronized with the comparison image. A monitoring system that monitors visually whether the EUT (Equipment Under Test) located inside the electromagnetic anechoic chamber is causing malfunction due to electromagnetic waves radiated from the antenna. A computer storing a reference image of the EUT in the form of a digital signal and storing information on an operation cycle of the EUT; And a vision board for converting an actual image input from a camera installed inside the electromagnetic anechoic chamber into a digital signal and outputting the digital signal to the computer. The reference image is a still image of the state in which the EUT operates normally, and the actual image is a video of the actual state of the EUT located inside the electromagnetic anechoic chamber in a state in which electromagnetic waves are radiated. The computer generates a plurality of comparative images by capturing the actual image frame by frame, The comparison image is a still image, and the computer extracts a change period of an image while comparing the plurality of comparison images and the screens of the reference image, and the change period of the extracted image and the operation period of the EUT stored in advance are The EMS monitoring system using a video, characterized in that it is determined that a malfunction of the EUT has occurred if a difference over a certain ratio. The method of claim 5, When the computer compares the screens of the plurality of comparison images and the reference image with each other, the computer expresses a time in which the rate of change of the image increases from minimum to maximum and then decreases to the minimum in one cycle. EMS monitoring system. A monitoring system that monitors visually whether the EUT (Equipment Under Test) located inside the electromagnetic anechoic chamber is causing malfunction due to electromagnetic waves radiated from the antenna. A computer storing the reference image for the EUT in the form of a digital signal; A vision board for converting an actual image input from a camera installed inside the electromagnetic anechoic chamber into a digital signal and outputting the digital signal to the computer; And an emulator electrically connected to a component or a circuit installed inside the EUT to monitor the operation of the component or the circuit, and to perform a corresponding movement or light emission according to the operation of the component or the circuit. The reference image is a still image of the emulator in a state in which the EUT is operating normally, and the actual image is a video of the actual state of the emulator in a state in which electromagnetic waves are radiated. The computer generates a plurality of comparison images by capturing the actual image at regular time intervals, The comparison image is a still image, and the computer compares the screens of the comparison image and the reference image to each other, and when the change of the image occurs, the EMS monitoring system using the video, characterized in that the malfunction of the EUT occurs. . The method of claim 7, wherein The computer compares any one or more of brightness, saturation, color, and contour of the surveillance region of the reference image with the surveillance region of the comparison image to generate an alarm when a change amount exceeding a certain ratio occurs. EMS monitoring system using still image.

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