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Autonomous Structural Visual Inspection Using Region-Based Deep Learning for Detecting Multiple Damage Types
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DOI：10.1111/mice.12334.png)
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Computer vision-based techniques were developed to overcome the limitations of visual inspection by trained human resources and to detect structural damage in images remotely, but most methods detect only specific types of damage, such as concrete or steel cracks. To provide quasi real-time simultaneous detection of multiple types of damages, a Faster Region-based Convolutional Neural Network (Faster R-CNN)-based structural visual inspection method is proposed. To realize this, a database including 2,366 images (with 500 x 375 pixels) labeled for five types of damagesconcrete crack, steel corrosion with two levels (medium and high), bolt corrosion, and steel delaminationis developed. Then, the architecture of the Faster R-CNN is modified, trained, validated, and tested using this database. Results show 90.6%, 83.4%, 82.1%, 98.1%, and 84.7% average precision (AP) ratings for the five damage types, respectively, with a mean AP of 87.8%. The robustness of the trained Faster R-CNN is evaluated and demonstrated using 11 new 6,000 x 4,000-pixel images taken of different structures. Its performance is also compared to that of the traditional CNN-based method. Considering that the proposed method provides a remarkably fast test speed (0.03 seconds per image with 500 x 375 resolution), a framework for quasi real-time damage detection on video using the trained networks is developed.
Keyword:
CRACK DETECTION
MACHINE
TRANSFORM
VISION
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