Fractal Dimension of Waveforms as a Useful Feature in Ultrasonic Imaging

In this paper an alternative way of generating C-scan images using Fractal Dimension (FD) of any digitized waveforms as an ultrasonic feature is proposed. The work is carried out on the composite specimen having flaw in the form of inclusion and damage created by the drop weight impact. The technique to estimate FD of a 2D image is modified in this work and a procedure to compute FD of a digitized waveform is evolved. FD is seen to be a representative or a defining parameter of the waveforms received from different regions of the scanned domain for being used in generation of C-scan image. A feature selection procedure based on the ID3 algorithm is also performed on the dataset. It substantiates FD as a potential ultrasonic feature.