KR102539838B1 - Apparatus for inspecting construction site safety based on augmented reality - Google Patents

Abstract

A construction site safety inspection device according to an embodiment of the present invention includes an information generation unit for generating first BIM information on a facility to be inspected and first site information or second site information on the facility to be inspected; an information correction unit generating second BIM information by applying the inspection items for the facility to be inspected to the first BIM information; a model generator for generating a first virtual model using the second BIM information and projecting the first virtual model onto the first site information or the second site information to generate a first augmented reality model; an inspection unit that receives an inspection result for the inspection items using the first augmented reality model; and an update unit for updating the second BIM information using the inspection result, wherein the first site information is obtained by photographing the site using a camera when the facility to be inspected is located at the site. image, and the second site information is a site model generated based on actual measurement information of the site using LIDAR when the facility to be inspected is not located at the site where the inspection target facility is installed.

Description

Construction site safety inspection device based on augmented reality {APPARATUS FOR INSPECTING CONSTRUCTION SITE SAFETY BASED ON AUGMENTED REALITY}

The embodiment relates to a construction site safety inspection device based on Augmented Reality (AR) and Building Information Modeling (BIM).

Various equipment and facilities are used at construction sites in the field of architecture and civil engineering, and safety management for them is directly related to human life and property damage. Therefore, continuous and accurate inspection is essential to minimize damage to life and property that may occur at the construction site.

Existing safety checks to achieve this purpose have been performed using the naked eye and conventional equipment. Safety inspection through the naked eye is greatly affected by weather conditions due to the nature of construction sites, which are mainly performed outdoors, and human error is included in the result depending on the characteristics of the inspector or inspector.

Recently, devices used for inspection or inspection have been modernized due to the development of various sensors and communication technologies, but the focus is mainly on measurement, and systematic construction site data ranging from design, construction, and maintenance by linking the results with BIM models. Management skills are insignificant. That is, conventional technologies are limited to simply providing design information about a construction site or information about a specific facility using BIM information. There is a limit to performing a safety inspection of a construction site only by providing such simple information.

Therefore, it is required to develop a technology capable of accurate and efficient safety inspection of a construction site.

An embodiment is to provide a construction site safety inspection device capable of providing augmented reality-based construction site information.

The embodiment is intended to provide a construction site safety inspection device that can more rationally and systematically perform the limitations of the existing construction site safety inspection through AR and BIM.

The embodiment is to provide a construction site safety inspection device that divides safety inspection and inspection at the construction site into on-site inspection and remote inspection and stores the inspection results in a BIM model to be utilized not only in construction but also in the maintenance stage after completion. .

The problem to be solved in the embodiment is not limited thereto, and it will be said that the solution to the problem described below or the purpose or effect that can be grasped from the embodiment is also included.

A construction site safety inspection device according to an embodiment of the present invention includes an information generation unit for generating first BIM information on a facility to be inspected and first site information or second site information on the facility to be inspected; an information correction unit generating second BIM information by applying the inspection items for the facility to be inspected to the first BIM information; a model generator for generating a first virtual model using the second BIM information and projecting the first virtual model onto the first site information or the second site information to generate a first augmented reality model; an inspection unit that receives an inspection result for the inspection items using the first augmented reality model; and an update unit for updating the second BIM information using the inspection result, wherein the first site information is obtained by photographing the site using a camera when the facility to be inspected is located at the site. image, and the second site information is a site model generated based on actual measurement information of the site using LIDAR when the facility to be inspected is not located at the site where the inspection target facility is installed.

When a target image corresponding to the inspection target facility is input, the model generating unit selects an area having a similarity with the target image of a predetermined value or more in the first site information or the second site information, and selects the corresponding area. It is possible to project the first virtual model on.

When a member constituting the inspection target facility is selected on the first augmented reality model, the inspection unit provides an inspection item for the selected member and an inspection result input tool for the inspection item, and uses the second site information. When the first point and the second point are selected on the first augmented reality model created by doing, the distance between the first point and the second point is calculated, and the distance between the actual measurement information of the site and the calculated distance is calculated. Comparative results can be provided.

The model generation unit generates a second virtual model using the updated second BIM information, and generates a second augmented reality model by projecting the second virtual model to the field information, and the inspection unit, the first 2 A re-inspection result for a re-inspection item generated based on the inspection result may be input using an augmented reality model.

The model generator may generate the second virtual model by changing a member corresponding to the re-inspection item to a predetermined color, and change the predetermined color differently based on a defect level corresponding to the re-inspection item. there is.

According to an embodiment, management/supervision of a construction site may be possible without temporal/spatial limitations.

According to the embodiment, the safety inspection and inspection process, which is repeatedly performed at the construction site, is divided into on-site inspection and remote inspection through AR and BIM technology, and the inspection results are stored in a BIM model to be used not only in construction but also in the maintenance stage after completion. It can provide high scalability.

According to the embodiment, not only can the existing safety inspection and inspection, which has been performed with the naked eye or conventional equipment, be performed more accurately and systematically, but also the history of the structure from design to construction and maintenance can be systematically managed. there is.

According to the embodiment, through remote inspection, safety inspection and inspection, which were currently difficult due to spatial constraints or weather conditions, can be performed in an indoor environment, preventing safety problems that may occur in the field in advance and establishing countermeasures. It can minimize human life and property damage caused by safety accidents.

According to the embodiment, cost management according to the construction of structures in the concept of life cycle can be performed through structure history management using BIM for on-site inspection and remote inspection data.

Various advantageous advantages and effects of the present invention are not limited to the above description, and will be more easily understood in the process of describing specific embodiments of the present invention.

1 is a block diagram of a construction site safety inspection system according to an embodiment of the present invention.
2 is a diagram showing a schematic process of a construction site safety inspection system according to an embodiment of the present invention.
3 is a configuration diagram of a construction site safety inspection device according to an embodiment of the present invention.
4 shows an example of a first augmented reality model generated using first field information according to an embodiment of the present invention.
5 shows an example of a first augmented reality model generated using second field information according to an embodiment of the present invention.
6 and 7 are diagrams for explaining an information providing function of a first augmented reality model according to an embodiment of the present invention.
8 is a diagram for explaining a function of providing a distance comparison result according to an embodiment of the present invention.
9 is an exemplary view of a second augmented reality model according to an embodiment of the present invention.
10 is a flowchart of a construction site management method according to an embodiment of the present invention.

Since the present invention can make various changes and have various embodiments, specific embodiments are illustrated and described in the drawings. However, this is not intended to limit the present invention to specific embodiments, and should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

Terms including ordinal numbers such as second and first may be used to describe various components, but the components are not limited by the terms. These terms are only used for the purpose of distinguishing one component from another. For example, a second element may be termed a first element, and similarly, a first element may be termed a second element, without departing from the scope of the present invention. The terms and/or include any combination of a plurality of related recited items or any of a plurality of related recited items.

It is understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, but other elements may exist in the middle. It should be. On the other hand, when an element is referred to as “directly connected” or “directly connected” to another element, it should be understood that no other element exists in the middle.

Terms used in this application are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly dictates otherwise. In this application, the terms "include" or "have" are intended to designate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, but one or more other features It should be understood that the presence or addition of numbers, steps, operations, components, parts, or combinations thereof is not precluded.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related art, and unless explicitly defined in the present application, they should not be interpreted in an ideal or excessively formal meaning. don't

Hereinafter, the embodiments will be described in detail with reference to the accompanying drawings, but the same or corresponding components regardless of reference numerals are given the same reference numerals, and overlapping descriptions thereof will be omitted.

1 is a block diagram of a construction site safety inspection system according to an embodiment of the present invention.

A construction site safety inspection system according to an embodiment of the present invention is a system (and framework) for performing a safety inspection of a construction site based on AR technology and BIM. The construction site safety inspection system projects and provides virtual BIM information to real construction site information so that users can grasp the situation of the construction site in three dimensions and in detail.

1, the construction site safety inspection system according to an embodiment of the present invention may include a construction site safety inspection device 100, a server device 200, and a measurement device 300 to perform the above functions. there is.

First, the construction site safety inspection device 100 may include an imaging device 101 , a display device 103 , an input device 104 , and a processing device 102 . The imaging device 101 refers to a device capable of capturing images, such as a camera. The imaging device 101 may generate site information by capturing a construction site. The processing device 102 may be implemented with a processor and a memory, such as a central processing unit (CPU), a micro controller unit (MCU), or an application processor (AP). The processing device 102 processes data input from the imaging device 101, the input device 104, the server device 200, the measurement device 300, etc. to generate/process information necessary for safety inspection of the construction site. can The display device 103 may refer to a device that provides a user with information necessary for using the construction site safety inspection device 100 . For example, the display device 103 may provide a user with an augmented reality model generated based on construction site information and BIM information. The input device 104 may refer to a device that receives information required to perform a construction site safety inspection from a user. The input device 104 may be implemented in a touch panel method, and in this case, it may be provided in the display device 103 .

The server device 200 may be a device that provides BIM data to the construction site safety inspection device 100 . In addition, the server device 200 may provide update information of an artificial intelligence algorithm to the construction site safety inspection device 100 . To this end, the server device 200 may be communicatively connected to the construction site safety inspection device 100 . The server device 200 does not necessarily have to be a server, and may be implemented as a terminal device such as a desktop computer or a mobile terminal capable of implementing the above functions.

The measurement device 300 may refer to a sensing device that measures a construction site. The measurement apparatus 300 may include a device capable of measuring the size of a facility at a construction site, such as LiDar and Time of Flight (ToF) cameras. The measurement device 300 may be implemented in a form of being disposed in a predetermined area of a construction site or mounted on a means such as a drone. The measurement device 300 may transmit measurement information to the construction site safety inspection device 100 and may be communicatively connected to the construction site safety inspection device 100 for this purpose.

2 is a diagram showing a schematic process of a construction site safety inspection system according to an embodiment of the present invention.

Referring to FIG. 2 , the construction site safety inspection system according to an embodiment of the present invention can be divided into a direct site inspection process and a remote site inspection process.

The direct site inspection process may refer to a process in which a user directly visits a construction site and performs a construction site safety inspection. The remote site inspection process may refer to a process capable of performing a construction site safety inspection in a situation where a user cannot directly visit a construction site. The remote site inspection process can be divided into a data comparison-based remote site inspection process and an automation-based remote site inspection process. The remote site inspection process based on data comparison refers to the process of performing remote site inspection by projecting the BIM model into a virtual space based on the actual data using the BIM model and data measured through a measuring device such as LiDar. can do. In this case, the user can perform a safety inspection of the construction site without time/spatial limitations. The automation-based remote site inspection process may refer to a process of performing remote site inspection using an augmented reality model projected with a BIM model in a virtual space based on actual measurement data and an artificial intelligence algorithm. The automation-based remote on-site inspection process has the advantage of minimizing the consumption of human resources as well as freeing from time/spatial constraints by performing remote on-site inspections with minimal user intervention.

In the direct site inspection process and the remote site inspection process, the field inspection results may be stored in BIM data, and in the subsequent inspection process, an augmented reality model may be generated based on the BIM data in which the field inspection results are stored. The follow-up inspection process repeatedly performs the above-described direct on-site inspection process and remote on-site inspection process based on the newly created augmented reality model. Through this follow-up inspection process, it is possible to ensure a high safety inspection of the construction site.

Hereinafter, with reference to drawings, a construction site safety inspection system capable of performing the above functions will be reviewed.

3 is a configuration diagram of a construction site safety inspection device according to an embodiment of the present invention.

Referring to FIG. 3 , the construction site safety inspection apparatus 100 according to an embodiment of the present invention includes an information generator 110, an information corrector 120, a model generator 130, an inspection unit 140, and an updater. may include section 150 .

The information generating unit 110 may generate first BIM information on the inspection target facility and first site information or second site information on the inspection target facility.

Here, the first BIM information may refer to building information modeling (BIM) data for a facility to be inspected. The first BIM information may be generated by receiving BIM data from a server or other terminal device.

Here, the first site information may be an image of a construction site captured using an imaging device 101 such as a camera. To this end, the construction site safety inspection apparatus 100 according to an embodiment of the present invention may include an imaging device 101 in a terminal. In order to photograph the site, the construction site safety inspection device 100 must be located at the construction site, and the first site information may be generated in the aforementioned direct site inspection process.

Here, the second site information may be generated using actual measurement information obtained by measuring a construction site using a measurement device 300 such as LIDAR. The information generating unit 110 may generate a 3D site model of the construction site using the measured information, and the 3D site model may be second site information. According to an embodiment of the present invention, the measurement device 300 such as LIDAR is provided separately from the construction site safety inspection device 100, and the first site information may be generated in the above-described remote site inspection process. The actual measurement information may be collected in the form of a point cloud, and may be automatically classified and stored for each member of the structure.

The information correction unit 120 may generate second BIM information by applying the inspection items for the inspection target facility to the first BIM information.

Here, items to be checked may be pre-input by the user, but are not limited thereto. Inspection items may be pre-stored or may be input together with input of BIM information, and the information correction unit 120 may select inspection items for the facility to be inspected in response to the BIM information.

The model generation unit 130 may generate a first virtual model using the second BIM information. And, the model generation unit 130 may generate a first augmented reality model by projecting the first virtual model onto the first site information or the second site information. That is, the first augmented reality model may be augmented reality obtained by synthesizing the first virtual model with the first site information or the second site information.

When a target image corresponding to a facility to be inspected is input, the model generating unit 130 selects an area having a similarity to the target image and a predetermined value or more in the first site information or the second site information, and provides a second field to the corresponding area. 1 A virtual model can be projected. The model generator 130 may accurately and reliably project the BIM model onto the first site information or the second site information using an image target technique and a C# script. Through this, the user can perform an accurate inspection of the facility.

The model generation unit 130 may generate a second virtual model using second BIM information updated from the first BIM information. And, the model generation unit 130 may generate a second augmented reality model by projecting the second virtual model onto the first site information or the second site information. That is, the second augmented reality model may be an augmented reality in which a second virtual model updated from the first virtual model is synthesized with the first site information or the second site information.

The model generating unit 130 may create a second virtual model by changing a member corresponding to the items to be rechecked into a predetermined color. Also, the model generating unit 130 may differently change a predetermined color based on a defect level corresponding to a recheck item. Accordingly, the second augmented reality model may display items to be rechecked to be distinguished from other items. Here, the re-inspection items may refer to items requiring re-inspection due to occurrence of an error or defect in a corresponding member during the inspection process.

When a member constituting the inspection target facility is selected on the first augmented reality model, the inspection unit 140 may provide an inspection item for the selected member and an inspection result input tool for the inspection item. In addition, the inspection unit 140 may receive an inspection result for an inspection item using the first augmented reality model. That is, the inspection unit 140 may receive an inspection result from the user through an inspection result input tool. This may also be the same as the second augmented reality model. According to an embodiment, when a member constituting the facility to be inspected is selected on the second augmented reality model, a re-inspection item for the selected member and a re-inspection result input tool for the re-inspection item may be provided. In addition, the inspection unit 140 may receive a re-inspection result for a re-inspection item generated based on the inspection result using the second augmented reality model. That is, the inspection unit 140 may receive input of the re-inspection result from the user through the re-inspection result input tool.

When the first point and the second point are selected on the first augmented reality model generated using the second site information, the inspection unit 140 calculates a distance between the first point and the second point, and actually measures the site. A comparison result between the actual measurement information and the calculated distance may be provided. Since actually-measured information obtained by actually measuring the site is generated during the remote site inspection process described above, the inspection unit 140 may provide a corresponding function in the first augmented reality model obtained by projecting the BIM model onto the second site information. In the description, the first augmented reality model is described, but the second augmented reality model may also provide the same corresponding function.

The update unit 150 may update the second BIM information using the inspection result. The update unit 150 may generate updated second BIM information by reflecting the inspection result in the second BIM information.

Hereinafter, a first augmented reality model according to an embodiment of the present invention will be described with reference to FIGS. 4 and 5 .

4 shows an example of a first augmented reality model generated using first field information according to an embodiment of the present invention.

As described above, the direct on-site inspection process is a process in which a user (ie, an inspector) directly inspects a facility at the site where the facility to be inspected is installed. Therefore, as shown in FIG. 4, the first augmented reality model generated in the direct field inspection process uses the second BIM information for the first field information captured by the user using an imaging device 101 such as a camera. It can be generated by projecting the first virtual model created by doing.

The image may be an image composed of one frame such as a photograph, but is not limited thereto. The image may be an image composed of a plurality of frames such as a moving picture. In this case, the first augmented reality model may be generated by projecting a first virtual model corresponding to each frame of an image composed of a plurality of frames.

5 shows an example of a first augmented reality model generated using second field information according to an embodiment of the present invention.

As described above, the remote on-site inspection process is a process in which a user (ie, an inspector) inspects a facility at a location other than the site where the facility to be inspected is installed. Therefore, in the remote on-site inspection process, images captured by the imaging device 101 may not be available. Therefore, as shown in FIG. 5 , the first augmented reality model generated in the remote site inspection process is based on the second site information generated based on the information obtained by measuring the site using the actual measurement device 300 such as LIDAR. 2 It can be generated by projecting the first virtual model created using BIM information.

That is, the second field information may be a three-dimensional virtual model like the first virtual model. Accordingly, the first augmented reality model generated using the second site information may be a 3D model, and the user controls (enlarges, reduces, rotates, moves, etc.) the first augmented reality model to precisely set a desired direction and target. you can check it out.

6 and 7 are diagrams for explaining an information providing function of a first augmented reality model according to an embodiment of the present invention.

As shown in FIG. 6 , when a member constituting a facility to be inspected is selected on the first augmented reality model, the inspection unit 140 may provide information on the selected member to the user. That is, the inspection unit 140 may provide the user with attribute information of each member included in the second BIM information. For example, the inspection unit 140 may provide information about family and type names, design dimensions and material properties, specifications and process dates of individual BIM members to the user.

As shown in FIG. 7 , when a member constituting the inspection target facility is selected on the first augmented reality model, the inspection unit 140 may provide an inspection item for the selected member and an inspection result input tool for the inspection item. . For example, the inspection unit 140 provides the user with inspection items classified into categories such as safety, quality, and rate of progress in the form of a pop-up, and allows the user to check the inspection items. A checklist can be provided so that the check results can be entered.

Through this, workers can make quick and accurate decisions at the construction site, and effective site management is possible.

8 is a diagram for explaining a function of providing a distance comparison result according to an embodiment of the present invention.

Referring to FIG. 8 , when a first point and a second point are selected on a first augmented reality model generated using second site information, the inspection unit 140 calculates a distance between the first point and the second point. can do.

For example, the user may select a first point and a second point through the input device 104 coupled to the display device 103 by touching the display device 103 on which the first augmented reality model is displayed. Then, the inspection unit 140 may calculate a straight line distance connecting the first point and the second point, and display the calculated distance information on the first augmented reality model, thereby providing the information to the user.

Meanwhile, the inspection unit 140 may provide a comparison result between actual measurement information obtained by actually measuring the site and the calculated distance. The inspection unit 140 may display distance information between the first point and the second point on the first augmented reality model and simultaneously provide actually measured distance information corresponding thereto. For example, when the user selects both ends of a column included in the facility, the inspection unit 140 calculates and provides the length of the column based on the projected virtual model, and at the same time, the length of the column actually measured by lidar or the like. can provide. In this case, a result of an error value between the two pieces of information may be provided together.

9 is an exemplary view of a second augmented reality model according to an embodiment of the present invention.

As described above, the model generation unit 130 may generate a second virtual model using the second BIM information updated from the first BIM information. And, the model generation unit 130 may generate a second augmented reality model by projecting the second virtual model onto the first site information or the second site information.

Referring to FIG. 9 , the model generation unit 130 may create a second virtual model by changing a member corresponding to a re-inspection item to a predetermined color. For example, as shown in FIG. 9 , a second virtual model may be created by displaying a member requiring re-inspection in red.

Although not shown in FIG. 9 , the model generating unit 130 may differently change a predetermined color based on a defect level corresponding to a recheck item. For example, the second virtual model may be generated by displaying a darker color as the defect level increases and displaying a lighter color as the defect level decreases.

10 is a flowchart of a construction site management method according to an embodiment of the present invention.

A construction site management method according to an embodiment of the present invention relates to a method implemented using the construction site management device (system) described above. The method shown in FIG. 10 is an example, and there may be various other methods that can utilize the construction site management device (system).

Referring to Figure 10, the information generator 110 may receive the first BIM information (S1005).

Then, the information correction unit 120 may generate second BIM information by applying the inspection items for the inspection target facility to the first BIM information (S1010).

The information generating unit 110 may receive a selection of an inspection process (S1015).

When the direct on-site inspection process is selected, the information generating unit 110 may generate first on-site information on the facility to be inspected (S1020).

On the other hand, if the remote on-site inspection process is selected, the information generation unit 110 may generate second on-site information on the facility to be inspected (S1025).

The model generation unit 130 may generate a first virtual model using the second BIM information (S1030).

And, the model generation unit 130 may generate a first augmented reality model by projecting the first virtual model onto the first site information or the second site information (S1035).

The inspection unit 140 may receive an inspection result for an inspection item using the first augmented reality model (S1040).

Next, the update unit 150 may update the second BIM information using the check result (S1045).

Then, the model generation unit 130 may generate a second virtual model using the updated second BIM information (S1050).

The model generation unit 130 may generate a second augmented reality model by projecting the second virtual model onto the first site information or the second site information (S1055).

The inspection unit 140 may receive a re-inspection result for a re-inspection item using the second augmented reality model (S1060).

The term '~unit' used in this embodiment means software or a hardware component such as a field-programmable gate array (FPGA) or ASIC, and '~unit' performs certain roles. However, '~ part' is not limited to software or hardware. '~bu' may be configured to be in an addressable storage medium and may be configured to reproduce one or more processors. Therefore, as an example, '~unit' refers to components such as software components, object-oriented software components, class components, and task components, processes, functions, properties, and procedures. , subroutines, segments of program code, drivers, firmware, microcode, circuitry, data, databases, data structures, tables, arrays, and variables. Functions provided within components and '~units' may be combined into smaller numbers of components and '~units' or further separated into additional components and '~units'. In addition, components and '~units' may be implemented to play one or more CPUs in a device or a secure multimedia card.

Although the above has been described with reference to the embodiments, this is only an example and does not limit the present invention, and those skilled in the art to which the present invention belongs will not deviate from the essential characteristics of the present embodiment. It will be appreciated that various variations and applications are possible. For example, each component specifically shown in the embodiment can be modified and implemented. And differences related to these modifications and applications should be construed as being included in the scope of the present invention as defined in the appended claims.

100: Construction site safety inspection device
110: information generating unit
120: information correction unit
130: model generation unit
140: inspection unit
150: update unit

Claims (5)

An information generating unit for generating first BIM information on a facility to be inspected and first site information or second site information on the facility to be inspected;
an information correction unit generating second BIM information by applying the inspection items for the facility to be inspected to the first BIM information;
a model generator for generating a first virtual model using the second BIM information and projecting the first virtual model onto the first site information or the second site information to generate a first augmented reality model;
an inspection unit that receives an inspection result for the inspection items using the first augmented reality model; and
An update unit for updating the second BIM information using the inspection result; includes,
The first site information,
When the facility to be inspected is located at a site where the facility is installed, it is an image taken of the site using a camera,
The second site information,
A construction site safety inspection device that is a site model generated based on actual measurement information of the site using lidar when the facility to be inspected is not located at the installed site. According to claim 1,
The model generator,
When a target image corresponding to the inspection target facility is input, an area having a similarity to the target image and a predetermined value or more is selected in the first site information or the second site information, and the first virtual area is selected as the corresponding area. A construction site safety check device that projects a model. According to claim 1,
The inspection department,
When a member constituting the inspection target facility is selected on the first augmented reality model, an inspection item for the selected member and an inspection result input tool for the inspection item are provided,
When a first point and a second point are selected on the first augmented reality model created using the second site information, a distance between the first point and the second point is calculated, and actually measured information of the site. And a construction site safety inspection device that provides a comparison result between the calculated distance. According to claim 1,
The model generator,
Creating a second virtual model using the updated second BIM information, and projecting the second virtual model to the field information to create a second augmented reality model,
The inspection department,
A construction site safety inspection device receiving a re-inspection result for a re-inspection item generated based on the inspection result using the second augmented reality model. According to claim 4,
The model generator,
A construction site safety inspection device that creates the second virtual model by changing a member corresponding to the re-inspection item to a predetermined color, and differently changing the predetermined color based on a defect level corresponding to the re-inspection item. .

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