Use of the Hough transform for the propagation mode extraction

This paper proposes the method of propagation mode extraction on ionograms with the help of the Hough transform. Usually, the Hough transform for ionogram processing is used at the step of track autoscaling, when propagation modes already extracted. Authors propose a method for image binarization based on the application of abnormal sample extraction method which allows to use of the Hough transform for propagation mode extraction. The experimental verification of the effectiveness of the proposed method is conducted. The ionogram processing approach can also be used to the element extraction on the images with the same properties.