In seismically active regions such as Italy most new buildings are built to resist earthquakes, but many older buildings are not. To find a balance between the cost and the effectiveness of retrofitting older buildings, the European Center for Training and Research in Earthquake Engineering (EUCENTRE) conducted tests on scale model buildings mounted on shake tables that simulated earthquakes. EUCENTRE turned to machine vision to find a quick and accurate method of monitoring the building’s movements during tests.