Angular Frequency Analysis of Wind Turbines by means of Digital Image Processing

This paper proposes a method to calculate the angular frequency of a wind turbine by using Artificial Vision techniques. For a given video in which several wind turbines appear, the set of frames that compose it are taken out. Then, a certain frame is analyzed to determine the wind turbines presented in the image. To deal with that, a preprocessing is carried out in order to improve the image contrast. Applying several filters, main regions of the image are emphasized remaining those ones which present a linear shape. They are identified as potential towers. Next, a rectangular region is defined in the upper area of the rotor. For this region, the number of white pixels is computed for every frame of the video. Maximum values correspond with blade sweeping that allow us to compute the angular frequency.