KR100631095B1 - System for collecting and managing construct information by using GIS - Google Patents

Abstract

The present invention relates to a building structure management system, and more specifically, to collect and manage building structure information using GIS that can collect and manage the information of the building structure using the location information using the PS and the image information of the building structure. It's about the system.

Building structure crack information collection and management system using the GS according to the present invention is an information collector for collecting and transmitting the structure information including the crack image of the structure and the location information of the information collector, and the structure information collected by the information collector Receiving the feature information, extracting the feature information, storing the feature information of the extracted structure, and accessing and providing the feature information of the structure in accordance with the request of the feature information of the plurality of user terminals, the management server and access through the Internet It is possible to transmit the identification information of the structure input by the user to the management server, and comprises a user terminal for receiving and displaying the characteristic information according to the identification information of the corresponding structure transmitted from the management server.

GIS, GPS, building structure, image processing, crack

Description

System for collecting and managing construct information by using GIS}

1 is a schematic diagram schematically showing a system for collecting and managing building structure information using GIS according to an exemplary embodiment of the present invention.

Figure 2 is a block diagram schematically showing a management server of the building structure information collection and management system using the GS according to an embodiment of the present invention.

3 is a table showing the crack information extracted by the crack information extraction unit according to an embodiment of the present invention.

4 is a table showing actual measurement data of cracks.

FIG. 5 is a table showing an error range between two pieces of data of crack information and real measurement data extracted by the crack information extracting unit according to an exemplary embodiment of the present invention.

6 is a block diagram schematically illustrating an information collector of a system for collecting and managing building structure information using GS according to an exemplary embodiment of the present invention.

The present invention relates to a building structure management system, and more particularly, to collect building structure information using GIS, which can collect and manage information of a building structure by using location information and image information of the building structure. And a management system.

Geographic Information System (GIS) is an information system for efficiently utilizing geographic information necessary for human life. Such a geographic information system is an information system that integrates and processes attribute data related to geographic information, and is used to collect, store, update, process, analyze, and output various types of geographic information, hardware, software, geographic information, and human resources. It contains in total.

Recently, with the development of wireless communication technology, wireless network technology, and mobile terminals such as PDAs and mobile phones, users can easily obtain desired information regardless of time and place. Geographic information system has introduced the mobile GIS field by incorporating such mobile related technology, and a representative example is a navigation system.

In general, building structures are constructed using rebar and concrete. Crack generation of such reinforced concrete structures has a complex cause depending on time, size, shape, and progress. Once a crack occurs, it can cause structural deterioration and various risk factors, so it is advisable to select an appropriate repair method and repair it.

As for the maintenance and repair of a building structure, the construction expert visits the site in person, observes the crack state of the structure, and takes appropriate measures to perform the repair. However, this method takes a lot of professional manpower, it takes a lot of time for professional personnel to visit the site in person and observe and prepare remedial measures. In addition, it is virtually impossible to quickly and systematically manage the crack information of a large number of building structures, and because it depends on the subjective knowledge and experience of the person, there is a disadvantage that the objectivity is insufficient to accurately measure the condition of the building structure.

The present invention was devised to solve such a problem, using GIS to quickly and systematically store and manage the feature information collected by analyzing the crack image data of the building structure according to the location information of the building. To provide a system for collecting and managing building structure information.

Furthermore, the present invention provides a building structure information collection and management system using GIS which provides stored feature information at the request of a user.

Building structure information collection and management system using the GS in accordance with an aspect of the present invention for achieving the above object is separate from the digital camera or information collector provided in the information collector that is carried by the manager who manages the building structure Taking a crack image of the structure by using a digital camera of the structure, and transmits the structure information including the position information of the information collector calculated by the captured crack image and the GPS signal received from the GPS satellite to the management server.

The management server receives the structure information from the information collector, extracts the location information of the information collector, and retrieves the structure of the shortest distance from the location information. In addition, the management server image-processes the crack image of the structure information, for example, extracts feature information such as the area, length, thickness, direction of the crack, and stores the extracted feature information for each structure of the shortest distance searched.

According to a further aspect of the present invention, the management server of the building structure information collection and management system using GS according to the present invention provides the feature information of the structure to a plurality of user terminals. The user connects to the management server through his terminal, for example, a mobile terminal including a mobile communication terminal and a PDA or a computer connected to the Internet. The user inputs identification information such as the name of a desired structure by using a user terminal connected to the management server, and the user terminal transmits the identification information of the input structure to the management server. The management server accesses the feature information of the structure according to the identification information of the structure of the user terminal from the database and transmits it to the user terminal. The user terminal receives the feature information of the structure transmitted from the management server and displays it through the display means of the corresponding terminal.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily understand and reproduce the present invention.

1 is a schematic diagram schematically showing a system for collecting and managing building structure information using GIS according to an exemplary embodiment of the present invention. As shown, the building structure information collection and management system using the GS according to the present invention is an information collector for collecting and transmitting the structure information including the position information calculated from the GPS image received from the GPS image and the crack of the structure ( 200 and the structure information collected by the information collector 200 to extract the feature information, and to store the feature information of the extracted structure, according to the request of the feature information of the plurality of user terminals 300 of the structure Management server 100 to access and provide the feature information, the management server 100 and can be connected through the Internet, and transmits the identification information of the structure input by the user to the management server 100, the management server 100 It is configured to include a user terminal for receiving and displaying the characteristic information according to the identification information of the structure transmitted from the).

The information collector 200 may be, for example, wireless internet communication, and may be a mobile terminal including a GPS module and a mobile terminal including a PDA or a small portable computer. In addition, the information collector 200 may be provided with a digital camera for photographing the crack image of the structure or may transmit the crack image photographed through a separate digital camera to the management server 100. When the manager of the building structure photographs the crack state of the structure through a camera or a separate digital camera provided in the information collector 200, the information collector 200 may calculate the corresponding information collector calculated through a GPS signal transmitted from a GPS satellite. The structure information including the position information of the 200, the photographed crack image and the identification information of the information collector 200 is transmitted to the management server (100).

The management server 100 receives the structure information transmitted from the plurality of information collectors 200 and extracts the position information of the information collector 200. The management server 100 calculates the building structure closest to the location where the information collector 200 is located through the extracted location information. In addition, the management server 100 extracts the feature information by analyzing the crack image from the structure information, and stores the extracted feature information for each structure identification information, such as, for example, the name of the structure or a given code. The management server 100 receives the structure identification information according to the request for providing the feature information of the structure from the user terminal, accesses the feature information of the structure and provides it to the user terminal. The feature information extracted by the management server 100 is crack information obtained by extracting a crack image from the structure information received through the information collector 200 and image processing the crack image. Description of the feature information will be described in detail through the configuration of the management server 100 to be described later.

For example, the user terminal may be a mobile terminal including a mobile communication terminal and a PDA that can be connected to the management server 100 through wireless communication or a computer that can be connected to the management server 100 through the Internet. The user terminal transmits the identification information of the structure, such as, for example, the name of the structure or the code given to the structure, together with the identification information of the user terminal, which is input through the user, to the management server 100. The management server 100 accesses the feature information according to the structure identification information transmitted through the user terminal and transmits it to the corresponding user terminal. The user terminal receives the feature information transmitted from the management server 100 and displays the feature information through display means such as a liquid crystal display.

According to a characteristic aspect of the present invention, the information collector 200 and the user terminal of the building structure information collection and management system using the GS according to the present invention may be physically implemented in one terminal.

2 is a block diagram schematically illustrating a management server of a system for collecting and managing building structure information using GS according to an exemplary embodiment of the present invention. As shown, the management server 100 according to the present invention is a structure location information database 110 for storing the location information of a plurality of structures on the map, and each information collector 200 from a plurality of information collectors 200 The information collecting unit 120 for receiving structure information including the position information and the crack image information of the structure, and the structure of the shortest distance from the information collector 200 position information of the structure information collected by the information collecting unit 120 The structure extraction unit 130 extracted from the position information database 110 and the image information of the structure information of the structure extracted by the structure extraction unit 130 are processed to extract the crack feature information of the corresponding structure, and the extracted feature It comprises a feature information extractor 140 for storing information in the feature information database 150 for each structure.

The structure location information database 110 stores geographic location information of each structure located on a map. The geographic location information of the structure may be, for example, a coordinate value such as latitude / longitude used in a digital map or a GPS coordinate value. Structure position information database 110 according to an embodiment of the present invention stores the position information of the structure located on the measured numerical map produced by the National Geographical Institute.

The information collector 120 receives structure information including location information and crack image data of the information collector 200 and identification information of the information collector 200 transmitted from the information collector 200 via wireless communication or the Internet. And transmit to the structure extraction unit 130. The structure extractor 130 extracts the position information of the information collector 200 from the structure information collected by the information collector 120, and constructs the structure having the shortest distance from the position information of the information collector 200. The location information database 110 searches.

The structure extractor 130 uses an indexing method of spatial information reflecting geographical characteristics as a multidimensional spatial indexing method to find a structure having the shortest distance based on the location information transmitted from the information collector 200. For example, the method using the R-Tree can be used. Spatial data stored in the R-Tree is represented as an object of a terminal node in a minimum bounding rectangle (MBR) based on the geographical position. When the information collector 200 transmits the position information calculated through the GPS signal transmitted from the GPS satellites to the management server 100, the structure extractor 130 of the management server 100 receives the position information of the information collector 200. As a reference, a location based query (LDQ) is generated for a region within a certain distance, and the nearest object is searched for all MBRs within a certain distance overlapping the region of the generated location based query.

The feature information database 150 stores feature information of the corresponding structure extracted by the feature information extractor 140 for each structure. According to the characteristic aspect of the present invention, the structure-specific feature information stored in the feature information database 150 according to the present invention is not updated and stored separately according to the storage time and used as management data of the building structure later.

The feature information extractor 140 extracts feature information by image processing the crack image data of the structure information collected through the information collector 120. The feature information extractor 140 converts the image data into a format suitable for image processing, and an image binarization converting and outputting the image data converted by the image preprocessor 141 into a binary image. In the image data binarized by the unit 142 and the image binarization unit 142, unnecessary noise is removed in image processing, and the corresponding crack image is counted to detect the length and direction of the crack in the noise-free image data. The fine line processing unit 143 to be linearized and the crack information extracting unit 144 which extracts the area, length, thickness, and direction of the crack from the thin wire image processed by the fine wire processing unit 143 and stores it in the feature information database 150. It is configured to include).

In general, image data photographed by a digital camera is configured in an RGB format. Image data of such RGB format requires a lot of processing time, and the crack of the structure generally proceeds finely and thinly unlike the new texture or texture. Accordingly, the image preprocessor 141 converts the RGB values into an average gray scale for output time saving of the crack image data transmitted in the RGB format and outputs the converted gray scale.

The image binarizer 142 converts the gray scale crack image data preprocessed by the image preprocessor 141 into a binary image. In order to process the image data converted to gray scale by the image preprocessing unit 141, first, pattern recognition of cracks is required. Pattern recognition is an image data processing process that recognizes features of cracks included in a target image. Types of target images in pattern recognition are color images, gray scale images, and binary images. Of the three images described above, the binary image is very simply displayed as one pixel (pixel) with 1 and 0, that is, white and black dots. This is an effective way to separate background and crack information.

The binarization technique may express the brightness value of the pixel g (x, y) as a function shown in Equation 1 below, which is commonly used as a term threshold. In this technique of boundary value processing, the pixel value of the output image corresponding to the case where the brightness is higher than or equal to a predetermined value for each pixel of the input image is set to 1, and otherwise, 0. f (x, y) and g (x, y) represent the light and shade values of the pixel in (x, y) after each image processing, and t represents the boundary value.

g (x, y) = 1, f (x, y) ≥T

         0, otherwise

         T = 90% of the subimage average

In order to determine the characteristics such as the length and thickness of the recognized crack, it is necessary to find the center line of the crack without changing the original crack. The thin line processing unit 143 removes unnecessary noise in the pattern, that is, crack recognition, from the binary image converted by the image binarization unit 142, and thins the crack and outputs the fine line. The reason for thinning is to find the centerline of the crack, and additionally, to facilitate the analysis of the shape of the crack and to minimize the amount of data.

The crack information extracting unit 144 extracts an area, a length, a thickness, and a direction occupied by the thinned thin line by the image thin line processor 143. The crack information extracting unit 144 extracts the area and length of the crack and counts the number of remaining 'ON' pixels of each binarized image and skeleton after all noise components are removed. Take a skeleton with a crack thickness of 9 pixels and get the best representation of the line using the line fitting algorithm. Then, the obtained equation is rotated 90 degrees to calculate a line segment orthogonal to the line segment. Proceed in both directions from the center point along this calculated line, if it meets the edge of the crack, calculate the distance from the center point to that point. These features are all computed by dividing by the number of pixels per 1mm that the final template calculates after calculation. In order to obtain the direction of crack propagation, the crack information extracting unit 144 divides the entire skeleton into 10 parts, finds each start point and end point, calculates the direction thereof, and calculates the direction of the total crack by averaging 10 values. do.

3 to 5 show the error information between the crack information, the actual measurement data and the two data extracted by the crack information extraction unit 144 according to an embodiment of the present invention. As shown, the error range of the numerical value and the measured data according to the present invention showed an average of less than 3%.

According to an additional aspect of the present invention, the management server 100 of the building structure information collection and management system using the GS according to the present invention is characterized by the feature information database 150 according to the structure information of the structure according to the structure identification information transmitted from the user terminal It may be configured to further include a feature information providing unit (160) provided by accessing from the user terminal.

The feature information providing unit 160 accesses feature information of the corresponding structure from the feature information database 150 according to requests for providing structure feature information from a plurality of user terminals and provides the feature information to the corresponding user terminal. The user connects to the management server 100 via his terminal, for example, a mobile terminal including a mobile communication terminal and a PDA or a computer connected to the Internet. The user inputs a structure name to be inquired, for example, a structure name or a code arbitrarily assigned to the structure. The user terminal receives the identification information of the structure and transmits it to the management server 100 together with the identification information of the corresponding terminal. The management server 100 outputs the identification information of the structure transmitted from the user terminal to the feature information providing unit 160. The feature information providing unit 160 accesses the feature information of the structure corresponding to the identification information of the structure, that is, the area, length, and thickness travel direction information of the crack from the feature information database 150 and transmits it to the corresponding user terminal.

The feature information providing unit 160 is connected to the user terminal 300 by multiplexing through the TCP / IP interface. Data transmission methods using the Internet include TCP (Transmission Control Protocol) and UDP (User Datagram Protocol). UDP is advantageous for real time transmission in data transmission but does not guarantee data integrity. When real time transmission such as Internet broadcasting or Internet phone is important, UDP method is used, but when connection setting, flow control, and error control are required, TCP is used. In the present invention, a user terminal 300 connected to the management server 100 is used. TCP was used for data transfer between

6 is a block diagram schematically illustrating an information collector of a system for collecting and managing building structure information using GS according to an exemplary embodiment of the present invention. As shown, the information collector 200 according to the present invention displays a menu and an operation state of the communication unit 210, the input unit 220, the information collector 200 for transmitting and receiving data with the management server 100 The display unit 230, the camera 240 for capturing and outputting image data of the crack portion of the structure, the GPS module 250 for receiving and outputting the GPS signal from the GPS satellite, and controls the overall information collector 200 The position information calculator 261 calculates and outputs position information of the information collector 200 from the GPS signal output from the GPS module 250, and the image data and position information calculator The control unit 260 including an information providing unit 262 for generating structure information including the position information output from the 261 to the management server 100 and the identification information of the information collector 200 and the corresponding information. It is configured to include a memory 270 that stores operation programs for driving the collector 200.

The communication unit 210, the input unit 220, the display unit 230, and the memory 270 may be well known techniques, and a detailed description thereof will be omitted. The camera 240 is generally a digital camera provided in the mobile communication terminal PDA, and additionally, an image taken by a general digital camera may be used. The GPS module 250 receives a GPS signal transmitted from the GPS satellite and outputs the GPS signal to the location information calculator 261.

The controller 260 controls the overall apparatus of the information collector 200, and includes a location information calculator 261 and an information provider 262. The location information calculator 261 calculates the location information according to the geographical position of the current information collector 200 from the GPS signal received by the GPS module 250 and outputs the location information to the information provider 262. 262 generates structure information including position information calculated by the position information calculator 261 and crack image data output from the camera 240, and transmits the structure information to the management server 100.

Additionally, the information providing unit 262 may transmit the identification information of the structure, such as the name of the structure or the code of the structure, which is arbitrarily assigned by the user, to the management server 100 along with the corresponding crack image. The management server 100 stores feature information extracted by analyzing a crack image transmitted from the information collector 200 for each structure identification information.

As described above, the building structure information collection and management system using the GS according to the present invention by analyzing the crack image of the building structure transmitted by the information collector and the location information of the building structure by measuring the degree of cracking of the building structure In addition, based on the mobile terminal, an efficient facility management database using geographic information in the GS environment can be constructed, and the constructed facility management database can be used as a useful material when implementing a management system for building structures. .

In addition, it is possible to measure the degree of objective cracking has the effect of saving the resources required from the needs of professionals and from the discovery of cracks to repair.

In addition, there is an advantage that can provide the crack information of the building structure over the Internet according to the information request of a plurality of user terminals.

The present invention has been described above with reference to preferred embodiments, but is not limited thereto, and is interpreted by the appended claims, which are intended to cover many modifications that will be apparent to those skilled in the art without departing from the scope of the present invention. Should be done.

Claims (9)

Analyze and store structure information received from multiple information collectors, and manage building structures using GIS implemented in a management server equipped with a building structure management program that provides structure information in response to access of a plurality of user terminals. In the system, the management server is: A structure location information database that stores location information of a plurality of structures on a map; An information collector configured to receive and output structure information including location information and crack image information of each information collector from the plurality of information collectors; A structure extraction unit configured to extract and output a structure having the shortest distance from the structure location information database from the information collector location information of the structure information collected by the information collection unit; An image preprocessor for extracting feature information by processing crack image information of the structure information of the structure extracted by the structure extracting unit, and converting the image data output by the information collecting unit into a format suitable for image processing; The image binarizer converts and outputs the image data converted by the image preprocessor to a binary image, and removes unnecessary noise in image processing from the image data binarized by the image binarizer, and removes the noise from the image data. The feature information database for each structure by extracting the area, length, thickness and direction of the crack from the thin wire processing unit for thinning the crack image to detect the length and the direction of the crack, and the crack image thinned by the thin wire processing unit. A feature information extracting unit including a crack information extracting unit stored in the unit; Building structure management system using GIs comprising a. The method of claim 1, wherein the characteristic information is: Building management system using GIS, characterized in that it comprises one or more of the area, length, thickness, direction of the crack of the structure. The method according to claim 1, wherein the management server is: A feature information providing unit for accessing feature information of the structure from the feature information database according to the structure identification information transmitted from the user terminal and providing the feature information to the corresponding user terminal; Building structure management system using GIs further comprises a. In the building structure information collecting system implemented in an information collector which is mounted and driven by a structure information collecting program for collecting structure information and transmitting the same to the management server, the information collector: A camera for outputting image data of the cracked portion of the structure; A GPS module for receiving and outputting GPS signals from the GPS satellites; A position information calculator which controls the overall information collector and receives a GPS signal output from the GPS module, calculates and outputs position information of the information collector; and image data output from the camera and the position information calculator. A control unit including an information providing unit generating structure information including the output position information and transmitting the generated structure information to the management server; Building structure information collection system using GIs comprising a. A plurality of information collectors, which are mounted and driven by a structure information collection program for collecting and transmitting structure information to a management server, analyze and store structure information received from the information collector, and respond to the connection of a plurality of user terminals. In the building structure information collection and management system using a GS including a management server that is mounted and driven is provided with a building structure management program, the information collector: A camera for outputting image data of the cracked portion of the structure; A GPS module which receives a GPS signal from a GPS satellite, calculates and outputs position information of the corresponding information collector; An information providing unit generating structure information including image data output from the camera and location information output from the GPS module and transmitting the generated structure information to the management server; The management server: A structure location information database that stores location information of a plurality of structures on a map; An information collector configured to receive and output structure information including location information and image information of each information collector from the information collector; A structure extraction unit configured to extract and output a structure having the shortest distance from the structure location information database from the information collector location information of the structure information collected by the information collection unit; An image preprocessor for extracting feature information by processing crack image information of the structure information of the structure extracted by the structure extracting unit, and converting the image data output by the information collecting unit into a format suitable for image processing; The image binarizer converts and outputs the image data converted by the image preprocessor to a binary image, and removes unnecessary noise in image processing from the image data binarized by the image binarizer, and removes the noise from the image data. The feature information database for each structure by extracting the area, length, thickness and direction of the crack from the thin wire processing unit for thinning the crack image to detect the length and the direction of the crack, and the crack image thinned by the thin wire processing unit. Including a feature information extraction unit including a crack information extraction unit to store in Things; Building structure information collection and management system using GS. The method of claim 5, wherein the characteristic information is: Building management system using GIS, characterized in that it comprises one or more of the area, length, thickness, direction of the crack of the structure. The method according to any one of claims 5 to 6, wherein the management server is: A feature information providing unit for accessing feature information of the structure from the feature information database according to the structure identification information transmitted from the user terminal and providing the feature information to the corresponding user terminal; Building structure information collection and management system using GIs further comprising a. 8. The method of claim 7, wherein the information collector is: Building structure information collection and management system using GIAS, characterized in that the mobile terminal or a portable computer including a mobile communication terminal and PD. The system of claim 8, wherein the information collector and the user terminal are physically implemented in one device.

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