Determining image orientation using the Hough and Fourier transforms
Christopher Hollitt, Ahmed Sheikh Deeb · 2012
Many machine vision tasks require that there be an adequate estimate of the vertical direction. Many environments have a relative richness of vertical features, so extracting the favoured direction allows the vertical direction to be estimated. In this paper two different techniques are used to extract the orientation of image features, one based on Fourier transforms, the other on Hough transforms. The two techniques in combination are shown to provide promising estimates of the vertical in a variety of indoor environments.