JP2021056117A - Evaluation device, evaluation system, control program, and method for evaluation - Google Patents

Abstract

To precisely evaluate the property of a surface of a weather-resistant steel material.SOLUTION: The present invention includes: a shape information acquisition unit (101) for acquiring three-dimensional shape information showing a three-dimensional shape of a surface measured by a scanner for measuring a three-dimensional shape of a target object; a two-dimensional image generation unit (102) for generating a plurality of pieces of two-dimensional images of images of the surface visually recognized from different angles from the three-dimensional shape information; and an evaluation unit (103) for evaluating the property of the shape on the basis of the plurality of pieces of two-dimensional images.SELECTED DRAWING: Figure 1

Description

The present invention relates to an evaluation device or the like for evaluating the surface properties of a weathering steel material.

In recent years, reducing the life cycle cost of buildings installed outdoors such as bridges has become an important issue, and weathering steel is drawing attention as a means for solving this issue. A weathering steel material is a steel material having a property of protecting the inside from corrosion or the like due to rust formed on the surface thereof. As the weathering steel material, those containing alloying elements such as copper, chromium and nickel are known.

Due to the above-mentioned properties, the weathering steel can withstand long-term use without being painted. Therefore, the weathering steel can be suitably applied to a building installed outdoors such as a bridge, and can contribute to the reduction of the life cycle cost thereof. However, depending on the environment in which the weathering steel is installed, the weathering steel may deteriorate faster than expected. Therefore, even for buildings using weathering steel, the surface properties are regularly evaluated and used in the evaluation results. Appropriate management must be performed accordingly.

FIG. 6 is a diagram showing an example of the evaluation classification of the surface properties of the weathering steel material. This classification is based on the evaluation classification stipulated by the Japan Iron and Steel Federation and the Japan Bridge Construction Association. In the example of FIG. 6, the surface properties of the weathering steel are classified into five levels of deterioration from level 1 to level 5. As for the deterioration level, the smaller the value, the greater the degree of deterioration.

Deterioration level 1 is a state in which layered peeling occurs on the rust on the surface of the weathering steel material. The thickness of rust, which is a guideline for deterioration level 1, is 800 μm or more. The weathering steel material of deterioration level 1 has a reduced plate thickness and a reduced strength due to peeling of rust on the surface. Therefore, it is necessary to measure the thickness of the weathering steel with deterioration level 1 and repair it as necessary.

Deterioration level 2 is a state in which scaly rust of about 5 to 25 mm is generated on the surface of the weathering steel material. The thickness of rust, which is a guideline for deterioration level 2, is 400 μm to 800 μm. For weathering steel with deterioration level 2, it is necessary to continuously observe changes in the appearance of rust because the problem of strength decrease occurs when the deterioration level progresses to 1.

Deterioration level 3 is a state in which rough rust of about 1 to 5 mm is generated on the surface of the weathering steel material. Further, the deterioration level 4 is a state in which fine and uniform rust of about 1 mm is generated on the surface of the weathering steel material. The thickness of rust, which is a guideline for deterioration levels 3 and 4, is less than 400 μm. It can be said that the weathering steel material is most stable in the state of deterioration levels 3 to 4.

Deterioration level 5 is a state in which the amount of rust is small and a relatively bright color tone is exhibited on the surface of the weathering steel material. The thickness of rust, which is a guideline for deterioration level 5, is less than 200 μm. Weathering steel with deterioration levels 3 to 5 can be used as it is without any special maintenance or other measures.

Currently, engineers are visually evaluating the surface properties of weathering steel. Therefore, there are problems such as variation in judgment results, an increase in aging bridges, and difficulty in securing engineers.

Here, as a technique related to rust corrosion of steel members, for example, the following Non-Patent Document 1 can be mentioned. Non-Patent Document 1 below describes that the rust-corroded portion is automatically identified based on the color information of the 3D point cloud data obtained by scanning the steel member with a laser scanner or the like. Specifically, in Non-Patent Document 1, when a point that matches a specific color condition, that is, a point where rust is generated is searched from the 3D point cloud data, and color information of the point that matches the condition is found. , That point is replaced with another color to make it a marker. As a result, the rusted area can be clearly indicated by a marker.

Kazuya Hase, i-Construction Promotion Consortium Technology Development / Introduction WG 2nd Seeds Briefing Material, "Technology for Automatically Detecting Rust Corrosion Locations Based on Color Information of 3D Point Cloud Data by Laser Scanner, etc.", 2018

However, the technique described in Non-Patent Document 1 does not assume the evaluation of the surface properties of the weathering steel material, and has a problem that it is insufficient for the evaluation of the surface properties of the weathering steel material. That is, the technique described in Non-Patent Document 1 specifies a rust-colored region as a rust-corroded portion, and can only determine the presence or absence of rust and the degree of spread, and is three-dimensional such as the thickness of rust and the size of unevenness. It is not possible to determine the properties of rust in consideration of its shape.

One aspect of the present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide an evaluation device or the like capable of accurately evaluating the surface properties of a weathering steel material.

In order to solve the above problems, the evaluation device according to one aspect of the present invention is an evaluation device for evaluating the surface properties of the weather-resistant steel material, and is generated by measuring the three-dimensional shape of the surface. A two-dimensional image generation unit that generates a plurality of two-dimensional images showing the appearance of the surface when the surface is viewed from different predetermined directions by using the three-dimensional shape information indicating the three-dimensional three-dimensional shape of the surface. And an evaluation unit for evaluating the properties of the surface based on the plurality of two-dimensional images.

In order to solve the above problems, the evaluation method according to one aspect of the present invention is an evaluation method for evaluating the surface properties of a weather-resistant steel material by an evaluation device, and is generated by measuring the three-dimensional shape of the surface. Using the three-dimensional shape information indicating the three-dimensional shape of the surface, a two-dimensional image showing the appearance of the surface when the surface is viewed from different predetermined directions is generated. It includes an image generation step and an evaluation step of evaluating the properties of the surface based on the plurality of two-dimensional images.

According to one aspect of the present invention, the surface properties of the weathering steel can be accurately evaluated.

It is a block diagram which shows an example of the main part structure of the evaluation apparatus which concerns on one Embodiment of this invention. It is a figure which shows the outline of the evaluation system including the said evaluation apparatus. It is a figure explaining the generation of the 2D image by the 2D image generation part. It is a figure which shows an example of the deterioration degree map. It is a flowchart which shows an example of the process executed by the said evaluation apparatus. It is a figure which shows an example of the evaluation classification of the surface property of a weathering steel material.

[System overview]
The outline of the evaluation system 100 according to the embodiment of the present invention will be described with reference to FIG. FIG. 2 is a diagram showing an outline of the evaluation system 100. The evaluation system 100 is a system for evaluating the surface properties of a weather-resistant steel material, and includes an evaluation device 1, a ground-based laser scanner (first scanner) 2, and a portable laser scanner (second scanner) 3. Including. The evaluation device 1 is communicably connected to each of the ground-based laser scanner 2 and the portable laser scanner 3. The communication method between the evaluation device 1 and each of the terrestrial laser scanner 2 and the portable laser scanner 3 may be a wireless method or a wired method.

In the present embodiment, the surface shape of the weathering steel used for the bridge is measured by the ground-based laser scanner 2 and the portable laser scanner 3, and the surface properties of the weathering steel are evaluated based on the measurement result. An example of doing so will be described. The evaluation system 100 is not limited to the weathering steel used for bridges, and the weathering steel used for any building can be evaluated.

The ground-based laser scanner 2 is a stationary scanner that measures the three-dimensional shape of an object, generates three-dimensional shape information indicating the measurement result, and outputs the three-dimensional shape information to the evaluation device 1. The ground-based laser scanner 2 can measure the three-dimensional shape of the surface of the weather-resistant material from a longer distance than the portable laser scanner 3. By using the ground-based laser scanner 2, it is possible to generate three-dimensional shape information of the weathering steel used for the bridge from a position away from the bridge.

On the other hand, the portable laser scanner 3 is a portable scanner (three-dimensional shape measuring device) that measures the three-dimensional shape of the surface of an object, generates three-dimensional shape information indicating the measurement result, and outputs the three-dimensional shape information to the evaluation device 1. To do. The measurement of the surface shape of the weathering steel material by the portable laser scanner 3 is carried out by holding the surface of the weathering steel material in a hand in a predetermined angle range (for example, a range of plus or minus 45 degrees) with respect to the direction viewed from the front. This is performed while moving the type laser scanner 3. As described above, the measurement of the surface shape of the weathering steel material by the portable laser scanner 3 is performed at a position close to the weathering steel material and is performed in a wide angle range with respect to the surface of the weathering steel material. The three-dimensional shape is shown more accurately than the three-dimensional shape information generated by the type laser scanner 2. That is, the portable laser scanner 3 has a higher resolution than the ground-based laser scanner 2. However, as mentioned above, since the measurer needs to be close to the weathering steel during measurement, it is necessary to use an aerial work platform or build a scaffolding depending on the position of the weathering steel to be evaluated. May occur.

The three-dimensional shape information generated by the ground-based laser scanner 2 and the portable laser scanner 3 may be information indicating the three-dimensional shape of the object. For example, the three-dimensional shape information may be three-dimensional point cloud data indicating the three-dimensional shape of an object, or a three-dimensional image (mesh model) generated using the three-dimensional point cloud data. You may. Further, in the present embodiment, an example in which the above-mentioned two types of laser scanners are used will be described, but if the three-dimensional shape of the surface of the weathering steel can be measured with a desired accuracy, a three-dimensional object other than the laser scanner will be described. A shape measuring device can also be applied.

Then, in the evaluation system 100, the evaluation device 1 which is an apparatus for evaluating the surface properties of the weathering steel material evaluates the surface properties of the weathering steel material based on the above-mentioned three-dimensional shape information and outputs the evaluation result. .. The evaluation device 1 can perform the above evaluation using the three-dimensional shape information measured by either the ground-based laser scanner 2 or the portable laser scanner 3, but the ground-based laser scanner 2 and the portable laser scanner 3 can perform the above evaluation. It is preferable to use them properly based on the above-mentioned characteristics. The details of this proper use will be described later.

[Structure of evaluation device]
A more detailed configuration of the evaluation device 1 will be described with reference to FIG. FIG. 1 is a block diagram showing an example of a main configuration of the evaluation device 1. As shown in FIG. 1, the evaluation device 1 is used by a control unit 10 that controls and controls each unit of the evaluation device 1, a communication unit 11 for the evaluation device 1 to communicate with other devices, and an evaluation device 1. A storage unit 12 for storing various data and an output unit 13 for the evaluation device 1 to output information are provided. Further, the control unit 10 includes a shape information acquisition unit 101, a two-dimensional image generation unit 102, an evaluation unit 103, an output control unit 104, and a synthesis unit 105.

The shape information acquisition unit 101 acquires three-dimensional shape information indicating the three-dimensional three-dimensional shape of the surface, which is generated by measuring the three-dimensional shape of the surface of the weathering steel material. Specifically, the shape information acquisition unit 101 acquires three-dimensional shape information measured by using the ground-based laser scanner 2 or the portable laser scanner 3. The three-dimensional shape information is acquired from the ground-based laser scanner 2 or the portable laser scanner 3 via the communication unit 11.

The two-dimensional image generation unit 102 uses the three-dimensional shape information acquired by the shape information acquisition unit 101 to generate a plurality of two-dimensional images showing the appearance of the surface of the weather-resistant steel material when viewed from different predetermined directions. To do. These two-dimensional images correspond to images of the surface of the weathering steel viewed from a plurality of different angles. The generation of the two-dimensional image will be described later based on FIG. The three-dimensional shape information that is the source of generating a plurality of two-dimensional images may be the three-dimensional shape information measured by the ground-based laser scanner 2 or the portable laser scanner 3, or the synthesis unit 105 described later may be used. It may be the generated three-dimensional shape information.

The evaluation unit 103 evaluates the surface properties of the weathering steel material using a plurality of two-dimensional images generated by the two-dimensional image generation unit 102. The evaluation criteria may be such that the degree of deterioration of the weathering steel can be classified into a plurality of stages. In the present embodiment, an example in which the surface properties of the weathering steel are evaluated by classifying them into one of the five levels of deterioration shown in FIG. 6, that is, the evaluation result of the evaluation unit 103 is the five levels of deterioration. An example is described. The details of the evaluation method by the evaluation unit 103 will be described later.

The output control unit 104 causes the output unit 13 to output the evaluation result of the evaluation unit 103. For example, if the output unit 13 is a display device, the output control unit 104 displays and outputs the evaluation result. The output mode of the evaluation result is not particularly limited, and the output unit 13 having a configuration according to the desired output mode may be provided. For example, when the evaluation result is to be output as audio, the output unit 13 may be an audio output device such as a speaker. The output unit 13 may be an external device of the evaluation device 1 attached to the evaluation device 1.

The synthesis unit 105 generates one three-dimensional shape information based on a plurality of three-dimensional shape information obtained by measuring the three-dimensional shape of the surface of the weathering steel material from a plurality of directions. Further, when the synthesis unit 105 generates the three-dimensional shape information, the two-dimensional image generation unit 102 generates a plurality of two-dimensional images from the three-dimensional shape information generated by the composition unit 105, and the evaluation unit 103 generates two of these two-dimensional images. The above-mentioned evaluation is performed using a dimensional image. It may not be possible to obtain sufficiently accurate 3D shape information by measuring from only one direction, but by synthesizing multiple 3D shape information measured from multiple directions, it is possible to obtain sufficiently accurate 3D shape information. Obtainable. Therefore, according to the above configuration, the accuracy of evaluation can be improved.

Specifically, the synthesis unit 105 synthesizes a plurality of three-dimensional point cloud data generated by the ground-based laser scanner 2 measuring the surface of the weather-resistant steel material from a plurality of directions to obtain one three-dimensional point cloud. Generate data. As a method of synthesizing a plurality of three-dimensional point cloud data to generate one three-dimensional point cloud data, for example, a conventionally known method can be applied. The measurement is preferably performed from, for example, 2 to 3 directions tilted by about 60 to 70 degrees in the vertical or horizontal direction with respect to the front direction of the weathering steel material.

The function of the synthesis unit 105 may be possessed by the ground-based laser scanner 2. In this case, the three-dimensional shape information acquired by the shape information acquisition unit 101 from the ground-based laser scanner 2 synthesizes a plurality of three-dimensional point cloud data generated by measuring the surface of the weather-resistant steel material from a plurality of directions. It becomes a thing. Therefore, in this case, the synthesis unit 105 can be omitted from the components of the evaluation device 1.

As described above, the evaluation device 1 uses the three-dimensional shape information generated by measuring the three-dimensional shape of the surface of the weather-resistant steel material to show the appearance of the surface when viewed from different predetermined directions. A two-dimensional image generation unit 102 that generates a plurality of two-dimensional images is provided. In addition, the evaluation device includes an evaluation unit 103 that evaluates the properties of the surface based on the plurality of two-dimensional images.

According to the above configuration, a plurality of two-dimensional images are generated from the three-dimensional shape information, and evaluation is performed based on the plurality of two-dimensional images. Thereby, among the information included in the three-dimensional shape information, the information necessary and sufficient for the evaluation of the surface properties of the weathering steel material can be used to accurately evaluate the surface properties of the weathering steel material.

[About the generation of two-dimensional images]
The generation of the two-dimensional image by the two-dimensional image generation unit 102 will be described with reference to FIG. FIG. 3 is a diagram illustrating generation of a two-dimensional image by the two-dimensional image generation unit 102. In FIG. 3, the X-axis and the Y-axis that are orthogonal to each other are set on the surface of the weathering steel material, and the Z-axis that is orthogonal to the X-axis and the Y-axis is set.

As described above, the three-dimensional shape information of the weathering steel material is the three-dimensional point cloud data indicating the three-dimensional shape of the surface of the weathering steel material. Therefore, by using the three-dimensional shape information, it is possible to generate a two-dimensional image when the surface of the weathering steel is viewed from an arbitrary angle.

For example, as shown in FIG. 3, the two-dimensional image generation unit 102 can generate a two-dimensional image of the weathering steel material viewed from the A direction (negative direction of the Z axis) from the three-dimensional shape information of the weathering steel material. it can. Similarly, the two-dimensional image generation unit 102 views the weather-resistant steel material from the B direction (direction in which the A direction is rotated by 45 degrees in the negative direction of the X-axis in the ZX plane) from the three-dimensional shape information of the weather-resistant steel material. It is possible to generate a two-dimensional image. Further, the two-dimensional image generation unit 102 viewed the weather-resistant steel material from the C direction (direction in which the A direction is rotated 60 degrees in the positive direction of the Y axis in the ZY plane) from the three-dimensional shape information of the weather-resistant steel material. It is also possible to generate a two-dimensional image.

As shown in FIG. 3, in the two-dimensional image viewed from the A direction, it can be recognized that the surface of the weathering steel has rust irregularities, but from this two-dimensional image alone, it is one of the points for evaluating the deterioration level. It is difficult to recognize the depth of rust. On the other hand, the depth of rust generated on the surface of the weathering steel can be easily recognized from the two-dimensional images viewed from the B direction and the C direction. Therefore, it can be said that these two-dimensional images contain necessary and sufficient information for evaluating the deterioration level. Therefore, the two-dimensional image generation unit 102 may generate a plurality of such two-dimensional images.

That is, the two-dimensional image generation unit 102 looks down or looks up at the surface of the weathering steel as shown in the B direction of FIG. 3 from the side, or as shown in the C direction of FIG. It is preferable to generate a two-dimensional image viewed from above. For example, the two-dimensional image generation unit 102 may generate a two-dimensional image in which the observation direction is shifted by a predetermined angle (for example, in increments of 15 degrees) in each of the up, down, left, and right directions with reference to the direction A. The direction of shifting by a predetermined angle is not limited to up, down, left, and right. The two-dimensional image generation unit 102 may generate a two-dimensional image with the rotation axis obliquely when shifting by a predetermined angle.

[Evaluation method]
A method in which the evaluation unit 103 evaluates the surface properties of the weathering steel material will be described. As described above, since the feature points of the three-dimensional shape of the surface of the weathering steel material appear in the plurality of two-dimensional images generated by the two-dimensional image generation unit 102, the evaluation unit 103 is based on the feature points. You can evaluate it.

For example, the evaluation unit 103 uses a trained model in which the relationship between the appearance of the surface of the weathering steel when viewed from different predetermined directions and the evaluation classification of the property of the surface is machine-learned. , The surface properties of the weathering steel may be evaluated.

In this case, the evaluation unit 103 generates the two-dimensional image generation unit 102 as information indicating the appearance of the surface of the weathering steel material when viewed from different predetermined directions with respect to such a trained model. Input multiple 2D images. As a result, information indicating the evaluation classification of the surface properties of the weathering steel material is output from the trained model. Therefore, the evaluation unit 103 can determine the evaluation category of the property according to the information. With such a configuration, it is possible to evaluate the surface properties of the weathering steel material with high accuracy.

The trained model as described above can be constructed, for example, by machine learning the relationship between a plurality of two-dimensional images and the deterioration level of the weathering steel material reflected in the two-dimensional images. As the teacher data used for constructing the learning model, a plurality of two-dimensional images generated from the three-dimensional shape information obtained by measuring the weathering steel having a known deterioration level can be used. It should be noted that the direction in which the two-dimensional image is used is determined in advance, and the two-dimensional image used for the evaluation is also the image viewed from the predetermined direction. The algorithm of the trained model is not particularly limited, but since the input data is an image, a convolutional neural network or the like can be preferably applied.

As described above, the ground-based laser scanner 2 and the portable laser scanner 3 have different resolutions, and the appearance of the two-dimensional image based on the ground-based laser scanner 2 and the two-dimensional image based on the portable laser scanner 3 are different. Is normal. Therefore, it is preferable that the trained model that inputs the two-dimensional image based on the ground-based laser scanner 2 constructs the two-dimensional image based on the ground-based laser scanner 2 as teacher data. Similarly, for a trained model that inputs a two-dimensional image based on the portable laser scanner 3, it is preferable to construct a two-dimensional image based on the portable laser scanner 3 as teacher data. However, if there is no significant difference in resolution between the ground-based laser scanner 2 and the portable laser scanner 3, a common trained model can be used.

[Example of presentation of evaluation results]
How to present the evaluation result is not particularly limited, but the weathering steel used for buildings such as bridges is generally large, and multiple measurements are performed to evaluate the entire surface. Often necessary. Further, since it is necessary to take appropriate measures for the deteriorated portion, it is preferable to present the evaluation result in a manner in which the distribution of the deteriorated portion can be recognized at a glance.

Therefore, the output control unit 104 may display and output the deterioration degree map generated based on the evaluation result of the evaluation unit 103 to the output unit 13. The deterioration degree map represents the distribution of evaluation results (for example, deterioration levels of 1 to 5) in each part of one building as a map.

FIG. 4 is a diagram showing an example of a deterioration degree map. In such a deterioration degree map, in an image of a building to be evaluated, the area where the weathering steel is reflected is divided into a plurality of areas evaluated by one measurement, and information showing the evaluation result in each area (Fig.). In the example of 4, it can be generated by superimposing (deterioration level values 1 to 5). The deterioration degree map may be generated by the output control unit 104, or a processing unit for generating the deterioration degree map may be added to the control unit 10 and generated by the processing unit.

Such a deterioration degree map can be used for various purposes. For example, the output control unit 104 may display and output the evaluation result based on the three-dimensional shape information measured by the ground-based laser scanner 2 to the output unit 13 as a deterioration degree map. Further, in this case, the output control unit 104 may highlight and display the area that needs to be remeasured by the portable laser scanner 3. As a result, the measurer using the portable laser scanner 3 can easily and correctly recognize the area to be remeasured. The remeasurement will be described later based on FIG. Then, the output control unit 104 has been generated when the evaluation result based on the result of remeasurement by the portable laser scanner 3 is different from the evaluation result based on the three-dimensional shape information measured by the ground-based laser scanner 2. You may update the degradation level of the area in the degradation map of.

The deterioration degree map can also be used to determine the cause of deterioration. For example, from the deterioration degree map of FIG. 4, it can be read that the deterioration level of the region near the connecting portion of the weathering steel is relatively low. From this, it can be determined that the state in which water such as rainwater easily accumulates in the connecting portion is the cause of deterioration in these regions.

If the correspondence between the deterioration level distribution pattern and the deterioration cause is modeled in advance, the cause can be automatically determined. That is, the control unit 10 of the evaluation device 1 may include a determination unit for determining the cause of deterioration of the weathering steel material based on the distribution pattern of the evaluation results of the evaluation unit 103 in each part of the weathering steel material. ..

Further, in determining the cause of deterioration, information other than the distribution pattern of the evaluation result may be taken into consideration. For example, a bridge blueprint contains information that may be related to rust, such as the placement of rainwater drainage channels. Further, for example, when there is a factory or the like that discharges a gas containing sulfide around the bridge, the gas may promote rust. Therefore, by considering such information, it is possible to improve the accuracy of determining the cause of deterioration.

[Processing flow]
The flow of the process (evaluation method) executed by the evaluation device 1 will be described with reference to FIG. FIG. 5 is a flowchart showing an example of the process executed by the evaluation device 1. When the weathering steel is divided into a plurality of regions and each region is evaluated as in the example of FIG. 4, the series of processes of S101 to S104 described below is performed by the ground-based laser scanner 2 for each region. After the measurement is completed, each area may be collectively performed.

In S101, the shape information acquisition unit 101 acquires the three-dimensional shape information of the surface of the weathering steel material measured by the ground-based laser scanner 2. Since the measurement by the ground-based laser scanner 2 is performed from a plurality of different directions, the shape information acquisition unit 101 acquires a plurality of three-dimensional shape information. Further, in S102, the synthesis unit 105 synthesizes a plurality of three-dimensional shape information acquired in S101 to generate one three-dimensional shape information.

In S103 (two-dimensional image generation step), the two-dimensional image generation unit 102 generates a plurality of two-dimensional images from the three-dimensional shape information generated in S102. These two-dimensional images show the appearance of the surface of the weathering steel when viewed from different predetermined directions.

In S104 (evaluation step), the evaluation unit 103 evaluates the surface properties of the weathering steel using the trained model. Specifically, the evaluation unit 103 inputs a plurality of two-dimensional images generated in S103 into the trained model, and determines the deterioration level based on the output value of the trained model. Further, in S104, the output control unit 104 may output the evaluation result of the evaluation unit 103 to the output unit 13. When evaluating a plurality of regions of the weathering steel material, the evaluation results may be output when the evaluation of all regions is completed.

In S105, the evaluation unit 103 determines whether or not the weathering steel material to be evaluated has a region where the deterioration level is equal to or less than the threshold value. If NO is determined in S105, the process of FIG. 5 ends. That is, if there is no region where the deterioration level is equal to or lower than the threshold value, the evaluation is completed without performing the measurement by the portable laser scanner 3. In this case, it is not necessary to arrange a worker for measurement by the portable laser scanner 3, an aerial work platform, or a scaffolding, and the evaluation is completed at an extremely low cost. The threshold value may be set as appropriate, but it is preferable to set the threshold value to a high value so as not to overlook the progress of deterioration. For example, the threshold value may be set to 3, and in this case, the presence or absence of the region of deterioration levels 1 to 3 is determined in S105.

On the other hand, if YES in S105, the portable laser scanner 3 remeasures the region where the deterioration level is equal to or less than the threshold value, and the process proceeds to S106. Prior to the remeasurement by the portable laser scanner 3, the output control unit 104 may output information indicating a region where the deterioration level is equal to or less than the threshold value to the output unit. As a result, the area that needs to be remeasured can be easily recognized.

In S106, the shape information acquisition unit 101 acquires the three-dimensional shape information of the above region on the surface of the weathering steel material from the portable laser scanner 3. Further, in S107 (two-dimensional image generation step), the two-dimensional image generation unit 102 generates a plurality of two-dimensional images from the three-dimensional shape information acquired in S106.

In S108 (evaluation step), the evaluation unit 103 evaluates the surface properties of the weathering steel using the trained model. Further, in S108, the output control unit 104 may output the evaluation result of the evaluation unit 103 to the output unit 13. When the process of S108 is completed, the process of FIG. 5 is completed.

When re-measuring a plurality of regions of the weathering steel with the portable laser scanner 3, the evaluation results may be output when the evaluation of all regions is completed, or each time the evaluation of one region is completed. The evaluation result may be output to. In the latter case, in S106, the shape information acquisition unit 101 may acquire the three-dimensional shape information generated by the portable laser scanner 3 in real time or substantially in real time. When the three-dimensional shape information is acquired, the processes S107 to S108 are promptly performed based on the acquired three-dimensional shape information. In particular, in S108, since the evaluation is performed using the two-dimensional image generated from the three-dimensional shape information instead of the three-dimensional shape information itself, the time required for the evaluation can be shortened.

Therefore, in this case, the output control unit 104 can output the evaluation result of S108 by the evaluation unit 103 to the output unit 13 in response to the shape information acquisition unit 101 acquiring the three-dimensional shape information. As a result, it is possible to promptly confirm the highly reliable evaluation result based on the measurement result of the portable laser scanner 3. Further, for example, when deterioration is confirmed, the measurer using the portable laser scanner 3 is notified to that effect, and the state of the surrounding weathering steel and its accessories is confirmed in detail. Will also be possible.

As described above, the evaluation system 100 includes the ground-based laser scanner 2 capable of measuring the three-dimensional shape of the surface of the weather-resistant steel material from a longer distance than the portable laser scanner 3, and the ground-based laser scanner 2 having higher resolution than the ground-based laser scanner 2. A portable laser scanner 3 is included. Then, the evaluation device 1 evaluates based on the measurement result by the portable laser scanner 3 when the degree of deterioration of the weathering steel material indicated by the evaluation result based on the measurement result by the ground-based laser scanner 2 exceeds a predetermined standard. To execute. As a result, it is possible to confirm the presence or absence of the deteriorated region and its position by measurement from a long distance, and to re-evaluate the deteriorated portion with high accuracy by the portable laser scanner 3 having high resolution. It can be performed. Therefore, in the evaluation of the surface properties of the weathering steel material, both work efficiency and evaluation accuracy can be achieved at the same time.

[Modification example]
In the above embodiment, the evaluation system 100 including two scanners, the ground-based laser scanner 2 and the portable laser scanner 3, has been described. However, the evaluation system 100 includes a scanner that measures the three-dimensional shape of the surface of the weather-resistant steel material. At least one may be included. Further, a scanner may be mounted on a flying object such as a drone to measure three-dimensional shape information.

Criteria for evaluating the surface properties of weathering steel may be appropriately determined, and are not limited to the above-mentioned five-step deterioration level. Further, the criteria for evaluating the surface properties of the weathering steel material differ depending on whether the three-dimensional shape information generated by the ground-based laser scanner 2 is used or the three-dimensional shape information generated by the portable laser scanner 3 is used. You may be.

For example, when using the three-dimensional shape information generated by the ground-based laser scanner 2, a deterioration level that requires re-evaluation (for example, corresponding to the above-mentioned deterioration levels 1 to 3) and a deterioration level that does not require re-evaluation (for example). It may be evaluated in two stages (corresponding to the above-mentioned deterioration levels 4 to 5). Then, when the three-dimensional shape information generated by the portable laser scanner 3 is used, it may be evaluated in five stages of deterioration levels 1 to 5.

The execution body of the process described in the above embodiment can be changed as appropriate. For example, the processing of S101 to S105 in FIG. 5 and the processing of S106 to S108 may be executed by different evaluation devices 1. The evaluation system 100 in this case is an evaluation device 1 that evaluates using the three-dimensional shape information generated by the ground-based laser scanner 2, and an evaluation device 1 that evaluates using the three-dimensional shape information generated by the portable laser scanner 3. The configuration includes and.

Further, for example, the processing of S102 in FIG. 5 may be performed by the ground-based laser scanner 2. In this case, the evaluation device 1 acquires the three-dimensional shape information synthesized from the ground-based laser scanner 2 in S101, and does not perform the processes of S102 to S103. Further, for example, the processing of S104 or S108 may be executed by another information processing device different from the evaluation device 1. In this case, the evaluation device 1 transmits the generated two-dimensional image to another information processing device, and acquires the evaluation result from the information processing device.

[Example of realization by software]
The control unit 10 (particularly, the shape information acquisition unit 101, the two-dimensional image generation unit 102, the evaluation unit 103, the output control unit 104, and the synthesis unit 105) of the evaluation device 1 is formed in an integrated circuit (IC chip) or the like. It may be realized by a logic circuit (hardware) or by software.

In the latter case, the evaluation device 1 includes a computer that executes instructions of a program that is software that realizes each function. The computer includes, for example, one or more processors and a computer-readable recording medium that stores the program. Then, in the computer, the processor reads the program from the recording medium and executes it, thereby achieving the object of the present invention. As the processor, for example, a CPU (Central Processing Unit) can be used. As the recording medium, a "non-temporary tangible medium", for example, a ROM (Read Only Memory) or the like, a tape, a disk, a card, a semiconductor memory, a programmable logic circuit, or the like can be used. Further, a RAM (Random Access Memory) for expanding the above program may be further provided. Further, the program may be supplied to the computer via an arbitrary transmission medium (communication network, broadcast wave, etc.) capable of transmitting the program. It should be noted that one aspect of the present invention can also be realized in the form of a data signal embedded in a carrier wave, in which the above program is embodied by electronic transmission.

The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the claims, and the embodiments obtained by appropriately combining the technical means disclosed in the different embodiments. Is also included in the technical scope of the present invention.

1 Evaluation device 2 Ground-based laser scanner (first scanner)
3 Portable laser scanner (second scanner)
100 Evaluation system 101 Shape information acquisition unit 102 Two-dimensional image generation unit 103 Evaluation unit 105 Synthesis unit

Claims (6)

An evaluation device that evaluates the surface properties of weathering steel.
Using the three-dimensional shape information indicating the three-dimensional shape of the surface generated by measuring the three-dimensional shape of the surface, the appearance of the surface when the surface is viewed from different predetermined directions can be obtained. A two-dimensional image generator that generates a plurality of two-dimensional images shown,
An evaluation unit that evaluates the properties of the surface based on the plurality of two-dimensional images,
An evaluation device characterized by being equipped with. The evaluation unit uses a trained model in which the relationship between the appearance of the surface when the surface is viewed from different predetermined directions and the evaluation classification of the property of the surface is machine-learned is used. Determine the evaluation classification of properties,
The evaluation device according to claim 1, wherein the evaluation device is characterized by the above. A shape information acquisition unit that acquires the three-dimensional shape information from a scanner that measures the three-dimensional shape of the surface,
An output control unit for outputting the evaluation result by the evaluation unit to the output unit in response to the shape information acquisition unit acquiring the three-dimensional shape information is further provided.
The evaluation device according to claim 1 or 2. The evaluation device according to any one of claims 1 to 3 and
An evaluation system including first and second scanners for measuring the three-dimensional shape of the surface of the weathering steel material.
The first scanner can measure the three-dimensional shape of the surface from a longer distance than the second scanner, and the second scanner has a higher resolution than the first scanner.
When the degree of deterioration of the weathering steel material indicated by the evaluation result based on the measurement result by the first scanner exceeds a predetermined standard, the evaluation device performs the evaluation based on the measurement result by the second scanner. Execute,
An evaluation system characterized by that. A control program for operating the evaluation device according to claim 1, wherein the evaluation device functions as the two-dimensional image generation unit and the evaluation unit. This is an evaluation method for evaluating the surface properties of weathering steel using an evaluation device.
Using the three-dimensional shape information indicating the three-dimensional shape of the surface generated by measuring the three-dimensional shape of the surface, the appearance of the surface when the surface is viewed from different predetermined directions can be obtained. A two-dimensional image generation step that generates the multiple two-dimensional images shown, and
An evaluation step for evaluating the properties of the surface based on the plurality of two-dimensional images, and
An evaluation method characterized by including.

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