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A water damage detection method for asphalt pavement based on self-adaptive selection of map gray scale

A detection method and self-adaptive technology, which is applied in the detection of asphalt pavement water damage based on the self-adaptive selection of map gray scale, in the field of asphalt pavement water damage, which can solve the problem of not considering the impact, accurate detection of water damage, and the inability to accurately locate the water damage area To achieve the effect of automatic detection and precise positioning, regular detection and patrol inspection, precise maintenance and intelligent maintenance

Active Publication Date: 2021-08-24
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] GPR is an effective detection method for water damage defects, but the existing dielectric constant test method based on GPR electromagnetic waves cannot accurately locate the water damage area and its depth, so the accurate detection of water damage is still a difficult problem
The invention patent proposed by the author (a water damage identification method based on the time-frequency statistical characteristics of ground penetrating radar signals, 201910100046.3) uses GPR data to realize the detection and automatic analysis of water damage through machine learning, but does not consider bridge deck paving. Influence of deck seams
GPR atlas can be effectively used to judge water damage. However, the characteristics of water damage defects are obviously different from the existing hyperbolic characteristics. Therefore, it is urgent to establish an automatic identification method for water damage defect atlas, improve the intelligence of GPR detection, and provide pavement Intelligent maintenance provides effective detection methods

Method used

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  • A water damage detection method for asphalt pavement based on self-adaptive selection of map gray scale
  • A water damage detection method for asphalt pavement based on self-adaptive selection of map gray scale
  • A water damage detection method for asphalt pavement based on self-adaptive selection of map gray scale

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0104] This embodiment provides a kind of asphalt pavement water damage detection method, such as Figure 1 to Figure 3 shown, follow the steps below:

[0105] Step 1: Obtain the water damage atlas dataset through the GPR pavement survey:

[0106] Step S11, GPR pavement survey and data collection: use the GPR system to collect on-site data on the asphalt pavement, and during the process of on-site data collection, determine the damaged area of ​​the pavement where there is bleeding or whitening;

[0107]In step S11, during the on-site data collection process, the sampling parameters require that the sampling distance be 1.6 GHz, and the sampling frequency be 10 to 20 times the main frequency of the antenna.

[0108] These markers will appear as small squares above the GPR map, such as figure 2 The mark "□" in the radar map in the middle corresponds to the water damage defect area, and the GPR map corresponding to these marks is used as the true value of water damage to dete...

Embodiment 2

[0162] This embodiment provides a method for adaptive selection of ground penetrating radar maps for water damage detection, such as Figure 9 As shown, the method adaptively selects the ground penetrating radar map according to the contrast of the ground penetrating radar map, and the method is carried out according to the following steps:

[0163] Step 1, read the preprocessed GPR data:

[0164] After preprocessing the GPR data, randomly generate radar atlases with different contrasts within the set contrast value range, and construct an initial random atlas dataset. The size of the initial random atlas dataset is N pictures, and the initial random atlas The map data set is used to determine whether it contains the target;

[0165] The method for obtaining the GPR data is as follows: using the GPR system to collect on-site data on the asphalt pavement, during the process of on-site data collection, determine the damage area where the road surface appears whitish or whitish, a...

Embodiment 3

[0232] This example presents a water damage detection method for asphalt pavement based on the adaptive selection of the map gray scale, such as Figure 1 to Figure 17 As shown, this method is basically the same as the asphalt pavement water damage detection method in Example 1, the only difference is that in step S12, "set the contrast of the GPR spectrum and intercept the GPR spectrum according to the length of 5-6m" is replaced by "choose a suitable Contrast GPR spectrum and intercept the GPR spectrum according to the length of 5-6m".

[0233] The method adopted in the selection of the GPR spectrum of suitable contrast is the ground-penetrating radar spectrum adaptive selection method;

[0234] The adaptive selection method of the ground penetrating radar spectrum is the same as the water damage detection method for asphalt pavement described in Embodiment 2 for water damage detection.

[0235] The recognition models described in Embodiment 1 and Embodiment 2 are the same ...

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Abstract

The present invention provides a method for detecting water damage on asphalt pavement based on self-adaptive selection of map grayscale, which is carried out according to the following steps: Step 1, through GPR pavement investigation, a water damage map data set is obtained, wherein: the GPR with suitable contrast The method used to select the atlas is the adaptive selection method of ground penetrating radar atlas; Step 2, image resolution adjustment; the resolution of the damaged initial atlas dataset is directly scaled to 224×224 to obtain the BD dataset; Step 3, the The data set is input to the identification model; the BD data set obtained in step 2 is input to the identification model, and after the identification model operation, step 4 is performed; step 4, the water damage result is output. The invention solves the problem of relying on manual experience to screen maps in the existing GPR data analysis, and effectively combines the map detection model, which can realize the automatic selection and identification of maps of each GPR data, and truly realizes the automation of target detection based on GPR and intelligent work.

Description

technical field [0001] The invention belongs to the field of road maintenance, relates to asphalt pavement water damage, in particular to a detection method for asphalt pavement water damage based on self-adaptive selection of map gray scale. Background technique [0002] Ground Penetrating Radar (GPR) is an instrument that uses radar pulse waves to detect and image conditions below the surface. Its principle is to use antennas to transmit and receive high-frequency electromagnetic waves to detect the material properties of the medium. GPR uses high-frequency and usually polarized radio waves to transmit waves below the surface. When the electromagnetic waves hit objects buried under the surface or reach the boundary of dielectric constant changes, the reflected waves received by the antenna will be recorded. The signal difference of the reflected echo. Because GPR can carry out continuous, rapid and non-damage detection, GPR has been applied in road traffic at present, suc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/88G01S13/89G01S7/41
CPCG01S13/885G01S13/89G01S7/41G06V10/12G06V10/82G06V10/40G01S7/417G01V3/12G01V3/15G06V10/42G01N27/221
Inventor 张军陶君
Owner CHANGAN UNIV
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