KR101800297B1 - Outside crack of concrete structures detection system utilizing flight - Google Patents

Abstract

The present invention relates to a system to detect an outer crack of a concrete structure using a flying object. The present invention is able to comprise: an input unit receiving data from a flying object; an output unit transmitting data to a server; and a control unit detecting a crack of a concrete structure using data received from the input unit.

Description

TECHNICAL FIELD [0001] The present invention relates to a crack detection system for a concrete structure,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0002] The present invention relates to a concrete structure outer casing crack detection system using a flying object.

As the time passes since the construction of the concrete structure, the frequency of inspection due to aging is increasing, but the inspection workforce is limited. Exposure to the risk of safety accidents due to the inspection of concrete structures, and in some places where the vehicle can not enter, it is replaced with a visual inspection from afar. In this case, the accuracy and reliability of the inspection become inferior. Therefore, there is a need for a method that can detect the outer cracks of concrete structures more safely and efficiently.

Therefore, it is possible to perform maintenance efficiently at a low cost by a spatial analysis solution of the photographed image data of the concrete structure using the air vehicle.

Patent Document 1: Korean Patent Publication No. 2016-0125590 Patent Document 2: Korean Patent No. 0725053

An embodiment of the present invention aims at preventing accidents by accurately diagnosing and predicting outer cracks of a concrete structure.

Embodiments of the present invention aim to improve precision, maintenance manpower, detection cost reduction, and work efficiency improvement over existing concrete structure crack detection methods.

A concrete structure outer casing crack detection system using a vehicle according to an embodiment of the present invention includes an input unit for receiving data from a flight vehicle; An output unit for sending data to the server; And a control unit for detecting a concrete structure using data received from the input unit. . ≪ / RTI >

The control unit may include a distance meter capable of receiving the data of the airplane from the input unit, sending the image data to the output unit after the image processing, and measuring the distance from the airplane to the concrete structure.

Wherein the controller multiplies a value obtained by dividing a camera angle of view of the vehicle by a half into a tangent value by a distance from the vehicle to a concrete structure and then multiplies the result by twice to obtain a distance on the screen of the image received from the input unit To an actual distance.

The control unit may measure the distance per pixel in the horizontal or vertical direction by dividing the distance on the screen of the image received from the input unit by the number of pixels in the horizontal or vertical direction.

The controller may extract an image of an RGB value at a predetermined time interval from an image received from the input unit, apply a predetermined threshold value to the extracted image, and binarize the image to a value of 1 or 0.

The control unit may label and group minutiae for dark portions of the binarized image.

The control unit performs labeling only when the pixel value of a predetermined ratio or more in the mask is one pixel by applying the mask of a predetermined size to the binarized image, integrates the labeling within a predetermined distance into one, If it is below the preset size, it can be deleted.

The control unit may send the position information and the detection time of the pixel group whose integrated labeling size exceeds a predetermined size to the output unit.

According to an embodiment of the present invention, the storage unit may store a captured image image and a temporal change pattern of a group in which the size of the integrated labeling exceeds a predetermined size.

According to the embodiment of the present invention, it is possible to prevent accidents through accurate diagnosis and prediction of the outer cracks of the concrete structure.

According to the embodiment of the present invention, it is possible to improve the accuracy, maintenance manpower, detection cost, and work efficiency of the existing concrete structure crack detection method.

1 is an exemplary block diagram of a concrete structure outer casing crack detection system using a vehicle according to an embodiment of the present invention.
FIG. 2 is an exemplary view showing a flight vehicle for photographing an outer periphery of a concrete structure according to an embodiment of the present invention.
3 is a cross-sectional view illustrating a vehicle body for photographing an outer periphery of a concrete structure according to an embodiment of the present invention.
4 is an exemplary diagram illustrating a labeling process using a mask according to an embodiment of the present invention.
5 is a flowchart illustrating a process of crack detection according to an embodiment of the present invention.

Other advantages and features of the present invention and methods of achieving them will become apparent with reference to the embodiments described below in detail with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims.

Unless defined otherwise, all terms (including technical or scientific terms) used herein have the same meaning as commonly accepted by the generic art in the prior art to which this invention belongs. Terms defined by generic dictionaries may be interpreted to have the same meaning as in the related art and / or in the text of this application, and may be conceptualized or overly formalized, even if not expressly defined herein I will not.

The terminology used herein is for the purpose of illustrating embodiments and is not intended to be limiting of the present invention. In the present specification, the singular form includes plural forms unless otherwise specified in the specification. As used herein, the terms' comprise 'and / or various forms of use of the verb include, for example,' including, '' including, '' including, '' including, Steps, operations, and / or elements do not preclude the presence or addition of one or more other compositions, components, components, steps, operations, and / or components. The term 'and / or' as used herein refers to each of the listed configurations or various combinations thereof.

It should be noted that the terms such as '~', '~ period', '~ block', 'module', etc. used in the entire specification may mean a unit for processing at least one function or operation. For example, a hardware component, such as a software, FPGA, or ASIC. However, '~ part', '~ period', '~ block', '~ module' are not meant to be limited to software or hardware. Modules may be configured to be addressable storage media and may be configured to play one or more processors. ≪ RTI ID = 0.0 >

Thus, by way of example, the terms 'to', 'to', 'to block', 'to module' refer to components such as software components, object oriented software components, class components and task components Microcode, circuitry, data, databases, data structures, tables, arrays, and the like, as well as components, Variables. The functions provided in the components and in the sections ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ' , '~', '~', '~', '~', And '~' modules with additional components.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings attached hereto.

1 is an exemplary block diagram of a concrete structure outer casing crack detection system using a vehicle according to an embodiment of the present invention.

Referring to FIG. 1, a concrete structure external crack detection system 10 may include an input unit 100, an output unit 200, a control unit 300, and a storage unit 400. The concrete structure outer casing crack detection system 10 may be connected to a vehicle and a server.

The input unit 100 can receive data from the air vehicle. Here, the flying body refers to a drone such as a drone. However, it is not limited to drones. The aircraft can capture the current state of the concrete structure in real time by including the camera in the aircraft.

Also, the input unit 100 can communicate with the air vehicle using wireless communication. For example, the network refers to wireless Internet technologies such as WLAN (Wireless LAN, Wi-Fi), Wibro (Wireless broadband), HSDPA (High Speed Downlink Packet Access), GSM, CDMA, WCDMA, LTE . However, the communication method is not limited to the wireless Internet technology described above, but may also be a local area communication technology or a wired Internet technology.

In addition, the aircraft may include altimeters, rangefinders, gimbals, and wireless communications equipment. The altimeter can recognize the altitude of the air vehicle. The distance between the aircraft and the concrete structure can be recognized through the distance meter. In addition, it may include a device that keeps imaging equipment, such as gimbals, always perpendicular to the ground.

The output unit 200 can send data to the server. Here, the server is a server located in a place where facilities are managed. For example, it may be a facility of a facility management corporation or a facility management person.

In addition, the output unit 200 may be connected to the server through a network. For example, the network may refer to a wired network technology, but is not limited thereto.

The control unit 300 can detect a concrete structure using data received from the input unit 100. The control unit 300 may include a distance meter that receives the data of the airplane from the input unit 100, sends the image data to the output unit 200 after image processing, and measures a distance from the airplane to the concrete structure.

According to one embodiment of the present invention, the controller 300 multiplies the tangent value obtained by dividing the angle of view of the camera of the vehicle by a half into a tangent value, multiplies the distance from the vehicle to the concrete structure, So that the distance on the screen of the image received from the input unit 100 can be converted into an actual distance.

Or the ratio of the distance between the air vehicle and the camera and the focal length can be determined by using the same principle as the distance between the image and the image sensor.

In addition, it is possible to calculate the size and thickness of cracks outside the concrete structure by calculating the size information of each camera pixel using the angle of view, the number of pixels and the distance information of the camera.

According to an embodiment of the present invention, the controller 300 may divide the distance on the screen of the image received from the input unit 100 by the number of horizontal or vertical pixels to measure the distance per pixel.

The concrete structure outside crack detection system 10 can exchange data through wireless communication. More specifically, the image of the concrete structure photographed by the aircraft can be transmitted to the concrete structure outer crack detection system 10, and the image, altimeter, and odometer data can be sent to the operator to change the operating angle of the aircraft and change the angle of view of the camera.

FIG. 2 is an exemplary view showing a flight body for photographing an outer periphery of a concrete structure according to an embodiment of the present invention. FIG. 3 is a view showing an airplane for photographing an outer periphery of a concrete structure according to an embodiment of the present invention. Fig.

The image merging program according to an embodiment of the present invention may proceed in the following order.

The control unit 300 extracts images of the R, G, and B values of the image received from the input unit 100 at predetermined time intervals, applies a preset threshold value to the extracted image, Can be binarized. For example, if the image received from the input unit 100 has a predetermined threshold R value set to 128 in the image for the RGB value at intervals of 0.25, a pixel value with an R value of 100 is 0, an R value Is 200, the pixel value is binarized to a value of 1. Here, the criterion for applying the predetermined threshold value is not limited to the R value but the B or G value is also possible.

The control unit 300 may label the minutiae of the dark portion of the binarized image.

4 is an exemplary diagram illustrating a labeling process using a mask according to an embodiment of the present invention.

Referring to FIG. 4, the controller 300 performs labeling only when a pixel value of a predetermined ratio or more within a mask is 1 pixel by applying a mask of a predetermined size, and performs labeling within a predetermined distance If the size of the integrated and integrated labeling is less than a predetermined size, it can be deleted.

According to an embodiment of the present invention, the controller 300 may send the position information and the detection time of the pixel group having the integrated labeling size exceeding a preset size to the output unit 200. [

5 is a flowchart illustrating a process of crack detection according to an embodiment of the present invention.

Referring to FIG. 5, the crack detection process of the concrete structure extracts images of RGB values and black-and-white images of the image received from the input unit 100 at predetermined time intervals, and applies predetermined threshold values to each extracted image And binarizes the image to a value of 1 or 0.

Then, the binarization image is labeled only when it is above a preset ratio by applying a predetermined size mask, and the labeling within a predetermined distance is integrated into one.

Thereafter, if the size of the integrated labeling is less than or equal to the predetermined size, the deletion is performed, and if the labeling form is not linear, the deletion is performed.

Then, the location information of the group in which the size of the integrated labeling exceeds the predetermined size, the size detection time, and the like are sent to the output unit 200.

In addition, it is possible to store in the storage unit 400 how the cracks are generated and changed. This is to make it possible to cope early if a similar crack is found later.

While the present invention has been described with reference to the exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. Those skilled in the art will appreciate that various modifications may be made to the embodiments described above. The scope of the present invention is defined only by the interpretation of the appended claims.

10: Concrete structure crack detection system
100: Input unit
200: Output section
300:
400:

Claims (9)

An input unit for receiving data from the air vehicle;
An output unit for sending data to the server; And
And a control unit for detecting a concrete structure using data received from the input unit,
The control unit includes:
Extracts an image of the RGB value at a predetermined time interval from the input unit, applies a preset threshold value to the extracted image, binarizes the image to a value of 1 or 0, Labeling is performed only when a pixel value of a predetermined ratio or more in a mask is one pixel by applying a mask of a predetermined size to the binarized image, and the labeling within a predetermined distance is integrated into one, And if the size is less than or equal to the predetermined size, deletes the position information of the pixel group and the detection time of the pixel group whose integrated labeling size exceeds a predetermined size to the output unit.
The method according to claim 1,
The control unit includes:
And a distance meter for receiving the data of the airplane from the input unit, sending the image data to the output unit after the image processing, and measuring the distance from the airplane to the concrete structure.
3. The method of claim 2,
The control unit includes:
The tangent value obtained by dividing the camera angle of view of the vehicle by half is multiplied by the distance from the vehicle body to the concrete structure and then the distance is multiplied by twice to obtain the distance on the screen of the image received from the input unit to the actual distance Concrete Structure Outer Crack Detection System Converting.
The method of claim 3,
The control unit includes:
Wherein the distance on the screen of the image received from the input unit is divided by the number of pixels in the horizontal or vertical direction to measure the distance per pixel in the horizontal or vertical direction.
delete delete delete delete The method according to claim 1,
And a storage unit for storing a captured image image and a temporal change pattern of a group in which the size of the integrated labeling exceeds a predetermined size.

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