DETECTION
OF EARTHQUAKE TRIGGERED ROOF HOLES
An earthquake (also known as a quake, tremor or temblor)
is the perceptible shaking of the surface of the Earth, which can be violent
enough to destroy major buildings and kill thousands of people. The severity of
the shaking can range from barely felt to violent enough to toss people around.
Earthquakes have destroyed whole cities. They result from the sudden release of
energy in the Earth's crust that creates seismic waves. The seismicity, seismism or seismic activity of an area refers
to the frequency, type and size of earthquakes experienced over a period of
time.
Figure., (a),(b) Detected roof holes
Many methods have been developed to detect
damaged buildings due to earthquake. However, little attention has been paid to
analyze slightly affected buildings. An unsupervised method is presented to
detect earthquake-triggered “roof-holes” on rural houses from unmanned
aerial vehicle (UAV) images. First, both orthomosaic and gradient images are
generated from a set of UAV images. Then, a modified Chinese restaurant
franchise model is used to learn an unsupervised model of the geo-object classes
in the area by fusing both over segmented orthomosaic and gradient images.
Finally, “roof-holes” on rural houses are detected using the learned model.
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