CN115063680A - Bridge disease identification method based on label and image synthesis technology - Google Patents

Bridge disease identification method based on label and image synthesis technology Download PDF

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CN115063680A
CN115063680A CN202210698546.3A CN202210698546A CN115063680A CN 115063680 A CN115063680 A CN 115063680A CN 202210698546 A CN202210698546 A CN 202210698546A CN 115063680 A CN115063680 A CN 115063680A
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CN115063680B (en
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吴刚
崔弥达
冯东明
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Southeast University
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Abstract

The invention discloses a bridge disease identification method based on a label and an image synthesis technology, and belongs to the technical field of calculation, calculation or counting. The method comprises the following steps: acquiring images of a small number of bridge diseases, marking semantic information of the diseases by using an image marking tool, and acquiring disease image labels; performing mask operation on the disease image and the disease image label to obtain a foreground image of the disease; acquiring a bridge disease-free image; synthesizing a large number of bridge disease images by using a small number of disease foreground images and disease-free images after mask operation, and generating label data of the images by recording image synthesis positions; and training a disease segmentation network based on deep learning by using the synthesized image data and the label information. The invention synthesizes a large amount of bridge disease images with pixel-level marking by using a small amount of marking data and some disease-free data, reduces the cost of manual marking data, and improves the accuracy and efficiency of disease identification.

Description

Bridge disease identification method based on label and image synthesis technology
Technical Field
The invention relates to the crossing field of bridge detection and image processing, and particularly discloses a bridge disease identification method based on a label and an image synthesis technology.
Background
In recent years, with the rapid development of infrastructure construction in China, a large number of roads and bridges are constructed, and the later detection and maintenance work of the bridges follows. At present, the main approach of bridge detection is manual detection, and the method is time-consuming and labor-consuming and can influence traffic. Some bridges built in mountains and on the sea are difficult to realize manual detection and to ensure the safety of bridge detection personnel. Therefore, an efficient and accurate bridge detection method is urgently needed.
With the rapid development of image processing technologies based on deep learning, in particular, image segmentation technologies based on supervised learning, are widely applied to disease detection of bridges, tunnels and roads in civil engineering. The method comprises the steps that a large number of labeled bridge disease images are needed to construct a data training set for identifying bridge diseases by utilizing a deep learning model, in the prior art, most of training data are labeled pixel by picture labeling tools such as labelme software to obtain image semantic segmentation labels, so that a large amount of manpower and material resources are consumed, and the timeliness of bridge disease identification cannot be met; on the other hand, enough rare bridge disease image data are not easily acquired in actual engineering, so that the number of samples of a bridge disease image data set is insufficient, the accuracy of deep learning model identification is affected, and the accuracy of bridge disease identification is further affected.
In summary, the present invention is directed to a bridge disease identification method based on a label synthesis technology, and aims to obtain a large number of bridge disease images with pixel-level labels through a simple digital synthesis technology.
Disclosure of Invention
The invention aims to provide a bridge disease identification method based on label and image synthesis technology, which aims to solve the technical problems that the existing label data training set acquisition mode cannot meet the requirements of accuracy and timeliness of bridge disease identification by realizing acquisition of a large number of synthetic images and corresponding pixel level label images through simple assignment operation.
The invention adopts the following technical scheme for realizing the aim of the invention:
a bridge disease identification method based on a label and an image synthesis technology comprises the following steps:
s1, acquiring images of a small number of bridge diseases, and marking semantic information of the diseases by using an image marking tool;
s2, performing mask operation on the original image collected in the step S1 and the generated label, keeping the pixels of the disease image area in the original image unchanged, and setting the pixels of the background part in the original image to zero to obtain a disease foreground image;
s3, converting the image obtained in the step S2 into an RGBA image;
s4, acquiring a bridge disease-free image, and converting the bridge disease-free image into an RGBA image;
s5, synthesizing a large number of images of the bridge diseases by using the images obtained in S3 and the images obtained in S4, and generating label data of the images by recording the image synthesis positions;
and S6, training an image segmentation network by using the synthetic bridge disease image and the label data generated in S5, and realizing quantitative identification of the bridge disease.
Preferably, in step S1, a high-definition camera is used to collect the bridge disease image, and it is ensured that the real physical size corresponding to each pixel is not less than 0.1 mm under the condition that the shooting distance is 50 cm.
Preferably, the image annotation tool used in step S1 can generate annotations at the bridge pixel level and ensure that the label and the image have the same resolution.
Preferably, the number of disease images of a certain type acquired and labeled in step S1 is generally no more than 10% of the number of final composite image data sets.
Preferably, after the bridge original image and the pixel-level label are masked in step S2, the size and resolution of the image remain unchanged.
Preferably, in step S3, the value of the transparency channel of the background portion of the image is adjusted to 0, and the transparency of the damaged portion is adjusted to 1.
Preferably, the resolution of the bridge disease-free image acquired in step S4 is not lower than that of the image acquired in step S1, the number of images is not lower than 200, and the images need to be transparent images.
Preferably, in step S5, the disease foreground image in the RGBA format is attached to the background image with all RGBA channels being zero to obtain a synthesized foreground image, the synthesized foreground image is added to the bridge disease-free image in the RGBA format to obtain a synthesized image, meanwhile, an assignment operation is performed on the synthesized foreground image to obtain a label image of the synthesized image, and the synthesized image and the label image form a data training set.
The specific method for obtaining the synthetic foreground image by pasting the disease foreground image in the RGBA format to the background image with the RGBA channels being zero comprises the following steps:
randomly cutting a disease foreground image in an RGBA format to obtain a foreground image;
randomly cutting the bridge disease-free image in the RGBA format to obtain a background image, generating an image which has the same size with the background image but all pixels are zero, and recording the image which has the same size with the background image but all pixels are zero as the background image with RGBA channels being zero.
Assigning the foreground image to a background image with RGBA channels being zero in a random lofting mode, and acquiring a synthetic foreground image
Preferably, in step S6, the trained neural network may be an image segmentation network, such as deplab V3 +.
By adopting the technical scheme, the invention has the following beneficial effects:
(1) according to the invention, on the premise of limited data volume by sea, a large number of bridge disease images and corresponding labels can be synthesized by a digital synthesis technology on the premise of a small number of labels, so that the cost of manual labeling data is greatly reduced, and the accuracy and efficiency of bridge disease identification are improved.
(2) The invention adopts a digital synthesis technology for synthesizing a large number of bridge disease images, the disease foreground images are pasted into the background images with zero RGBA channels in a random lofting mode to obtain the synthetic foreground images, the types of the synthetic foreground images can be enriched by randomly cutting the disease foreground images and the background images, the binary operation is carried out on the synthetic foreground images in the process of synthesizing the synthetic foreground images and the background images, the synthetic foreground images are converted into label images for recording the synthetic position information, further the synthetic images and the pixel level label images corresponding to the synthetic objects are obtained, a training data set for identifying bridge diseases is constructed by the synthetic images and the corresponding pixel level labels, sufficient training data can improve the identification accuracy, and the time for obtaining the training data set is greatly reduced compared with the traditional manual labeling mode, and further improve the efficiency of recognition.
Drawings
FIG. 1 is a flow chart of bridge defect identification according to the present invention.
Fig. 2(a) is a crack image, and fig. 2(b) is an image label obtained by labeling the crack image shown in fig. 2 (a).
FIG. 3 is a diagram illustrating a randomly cropped image according to the present invention.
FIG. 4 is a schematic diagram of an image synthesis technique according to the present invention.
Fig. 5 is a schematic diagram of a deep neural network used in the present invention.
Detailed Description
The technical scheme of the invention is explained in detail in the following with reference to the attached drawings.
As shown in fig. 1, the invention discloses a bridge disease identification method based on a label and an image synthesis technology. Including the following steps S1 to S6.
Step S1: acquiring a small number of bridge disease images, and marking semantic information of the disease images by using an image marking tool
Under the condition that the shooting distance is guaranteed to be 50cm, a high-definition camera is adopted to collect bridge disease images, and the real physical size corresponding to each pixel is not less than 0.1 mm; and selecting 50 images from the shot bridge disease images, and performing semantic annotation on each selected image by adopting a labelme tool to obtain the label of each bridge disease image. And (3) performing pixel-by-pixel semantic annotation on the crack image shown in the fig. 2(a) by using an annotation tool to obtain the image label shown in the fig. 2 (b).
Step S2: performing a mask operation on the original bridge disease image collected in step S1 and the image label generated in step S1
And for each original bridge disease image, performing mask operation on the original bridge disease image and the corresponding pixel level image label thereof, keeping the size and the resolution of the image unchanged, keeping the disease image area in the original bridge disease image unchanged, and setting pixels of the area except the disease image area in the original bridge disease image to zero to obtain a disease foreground image I.
Step S3: converting the image obtained after the mask operation in the step S2 into an RGBA image
Adjusting the numerical value of the background partial transparency channel of the image obtained after the mask operation of the step S2 to 0; and adjusting the partial transparency of the disease image area to 1 to obtain a disease foreground image I in an RGBA format.
Step S4: acquiring a bridge disease-free image, and converting the acquired bridge disease-free image into an RGBA image
The acquired bridge disease-free images are images with transparency and the resolution is not lower than that of the bridge disease images acquired in the step S1, and the number of the acquired bridge disease-free images is not lower than 200.
Step S5: using the image obtained in step S3 and the image obtained in step S4, images of bridge defects are synthesized in large quantities, and label data of the images is generated by recording the image synthesis positions
As shown in fig. 4, firstly, randomly cutting the disease foreground image I obtained in step S3 to obtain an image I0, randomly cutting the bridge disease-free image obtained in step S4 to obtain a background image Ib, then generating an image I1 which has the same size as the background image Ib but each pixel is zero, assigning the value of I0 obtained by randomly cutting the disease foreground image to I1 by means of random lofting to obtain a synthesized foreground image I2, generating a label image mask by the synthesized foreground image I2 through pixel-by-pixel operation, and specifically, the pixel-by-pixel operation of the synthesized foreground image I2 is to set only a non-zero pixel value to 1 while keeping zero pixels in the synthesized foreground image I2 unchanged; subsequently, the synthetic foreground image I2 is added to the background image Ib to obtain a synthetic image Ic, thereby obtaining a synthetic image and a corresponding label.
Fig. 3 shows a schematic diagram of randomly cropping an image, and an image generated by randomly cropping the image generated in step S3 is attached to an image generated by randomly cropping the image generated in step S4 and synthesized, so that the diversity of the synthesized foreground images is increased. The position of the image obtained in the step S3 attached to the image obtained in the step S4 after cutting is recorded in the synthetic foreground image I2 obtained through random lofting, and the image I2 is binarized to obtain a label image corresponding to the synthetic image. When a plurality of diseases are contained in the disease foreground image, the image I2 is assigned with a value according to the type of the contained disease, and a label image recording the image synthesis position (the position in the foreground image corresponding to each disease) can be obtained.
Step S6: training semantic segmentation network by using data training set generated by S5 to realize quantitative identification of bridge diseases
The semantic segmentation network may be selected as deep V3+ as shown in fig. 5.
The above is only a preferred embodiment of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit of the invention, and these modifications and improvements are intended to be within the scope of the invention.

Claims (10)

1. A bridge disease identification method based on label and image synthesis technology is characterized in that,
acquiring a bridge disease image, and performing semantic information annotation on the bridge disease image to acquire a label of the bridge disease image;
performing mask operation on the bridge disease image and the label thereof to obtain a disease foreground image and obtain a disease foreground image in an RGBA format;
acquiring a bridge disease-free image, and converting the acquired bridge disease-free image into an RGBA format;
attaching the disease foreground image in the RGBA format to a background image with zero RGBA channels to obtain a synthetic foreground image, adding the synthetic foreground image and the bridge disease-free image in the RGBA format to obtain a synthetic image, and performing assignment operation on the synthetic foreground image to obtain a label image of the synthetic image, wherein the synthetic image and the label image form a data training set;
and training a neural network for identifying the bridge diseases by adopting the data training set.
2. The bridge disease identification method based on the label and image synthesis technology according to claim 1, wherein the specific method for obtaining the synthesized foreground image by pasting the disease foreground image in the RGBA format to the background image with the RGBA channels being zero comprises the following steps:
randomly cutting the disease foreground image in the RGBA format to obtain a foreground image;
randomly cutting the bridge disease-free image in the RGBA format to obtain a background image, generating an image which has the same size as the background image and all pixels are zero, and recording the image which has the same size as the background image and all pixels are zero as the background image with RGBA channels being zero;
and assigning the foreground image to a background image with zero RGBA channels in a random lofting mode to obtain a synthetic foreground image.
3. The bridge disease identification method based on the label and image synthesis technology according to claim 1, wherein the specific method for obtaining the label image of the synthetic image by performing the assignment operation on the synthetic foreground image is as follows: and performing pixel-by-pixel operation on the synthesized foreground image, keeping 0 pixel in the synthesized foreground image unchanged, setting a non-zero pixel in the synthesized foreground image as a corresponding number according to the type of the disease, and acquiring a label image of the synthesized image.
4. The bridge disease identification method based on the label and image synthesis technology as claimed in claim 1, wherein a high-definition camera is adopted to collect bridge disease images under the condition that the shooting distance is guaranteed to be 50cm, and the real physical size corresponding to each pixel is greater than or equal to 0.1 mm.
5. The bridge disease identification method based on the label and image synthesis technology as claimed in claim 1, wherein the number of the acquired and labeled certain bridge disease images is less than or equal to 10% of the number of the final synthetic image data sets.
6. The bridge disease identification method based on the label and image synthesis technology according to claim 1, wherein the specific method for performing mask operation on the bridge disease image and the label thereof to obtain the disease foreground image is as follows: keeping the size and the resolution of the bridge disease image unchanged, keeping the pixel value of the disease image area in the bridge disease image unchanged, setting the pixel value of the background area in the bridge disease image to 0, and obtaining a disease foreground image.
7. The bridge disease identification method based on the label and image synthesis technology according to claim 1, wherein the specific method for obtaining the disease foreground image in the RGBA format is as follows: and adjusting the transparency of the background part of the disease foreground image to be 0, and adjusting the transparency of the disease image area in the disease foreground image to be 1.
8. The bridge disease identification method based on the label and image synthesis technology as claimed in claim 1, wherein the bridge disease-free image has transparency and resolution higher than or equal to the bridge disease image, and the number of the acquired bridge disease-free images is greater than or equal to 200.
9. The bridge disease identification method based on the label and image synthesis technology as claimed in claim 1, wherein the neural network for identifying the bridge disease is a semantic segmentation network.
10. The bridge disease identification method based on the label and image synthesis technology according to claim 9, wherein the semantic segmentation network is deep V3 +.
CN202210698546.3A 2022-06-20 2022-06-20 Bridge disease identification method based on label and image synthesis technology Active CN115063680B (en)

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CN116168242A (en) * 2023-02-08 2023-05-26 阿里巴巴(中国)有限公司 Pixel-level label generation method, model training method and equipment

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US20150294477A1 (en) * 2014-04-09 2015-10-15 Google Inc. Image-Based Bridge Identification and Boundary Detection
CN111861978A (en) * 2020-05-29 2020-10-30 陕西师范大学 Bridge crack example segmentation method based on Faster R-CNN
CN112488990A (en) * 2020-11-02 2021-03-12 东南大学 Bridge bearing fault identification method based on attention regularization mechanism

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US20150294477A1 (en) * 2014-04-09 2015-10-15 Google Inc. Image-Based Bridge Identification and Boundary Detection
CN111861978A (en) * 2020-05-29 2020-10-30 陕西师范大学 Bridge crack example segmentation method based on Faster R-CNN
CN112488990A (en) * 2020-11-02 2021-03-12 东南大学 Bridge bearing fault identification method based on attention regularization mechanism

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CN116168242A (en) * 2023-02-08 2023-05-26 阿里巴巴(中国)有限公司 Pixel-level label generation method, model training method and equipment
CN116168242B (en) * 2023-02-08 2023-12-01 阿里巴巴(中国)有限公司 Pixel-level label generation method, model training method and equipment

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