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JDR Vol.13 No.5 pp. 928-942
(2018)
doi: 10.20965/jdr.2018.p0928

Paper:

Damage Detection Method for Buildings with Machine-Learning Techniques Utilizing Images of Automobile Running Surveys Aftermath of the 2016 Kumamoto Earthquake

Shohei Naito*,†, Hiromitsu Tomozawa**, Yuji Mori**, Hiromitsu Nakamura*, and Hiroyuki Fujiwara*

*National Research Institute for Earth Science and Disaster Resilience (NIED)
3-1 Tennodai, Tsukuba, Ibaraki 305-0006, Japan

Corresponding author

**Mizuho Information and Research Institute, Inc., Tokyo, Japan

Received:
April 2, 2018
Accepted:
August 10, 2018
Published:
October 1, 2018
Keywords:
damage detection, machine-learning, image analyzing, running survey, SVM
Abstract

In order to understand the damage situation immediately after the occurrence of a disaster and to support disaster response, we developed a method to classify the degree of building damage in three stages with machine-learning using road-running survey images obtained immediately after the Kumamoto earthquake. Machine-learning involves a learning phase and a discrimination phase. As training data, we used images from a camera installed in the travel direction of an automobile, in which the degree of damage was visually categorized. In the learning phase, class separation is carried out by support vector machine (SVM) on a basis of a feature calculated from training patch images for each extracted damage category. In the discrimination phase, input images are provided with raster scan so that the class separation is carried out in units of the patch image. In this manner, learning, discrimination, and parameter tuning are repeated. By doing so, we developed a damage-discrimination model for each patch image and validated the discrimination accuracy using a cross-validation method. Furthermore, we developed a method using an optical flow for preventing double counting of damaged areas in cases where an identical building is captured in multiple photos.

Cite this article as:
S. Naito, H. Tomozawa, Y. Mori, H. Nakamura, and H. Fujiwara, “Damage Detection Method for Buildings with Machine-Learning Techniques Utilizing Images of Automobile Running Surveys Aftermath of the 2016 Kumamoto Earthquake,” J. Disaster Res., Vol.13, No.5, pp. 928-942, 2018.
Data files:
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Last updated on Dec. 13, 2018