Lulu Zhao

Date of Award


Document Type


Degree Name

Master of Science (MS)


Computer Science

Committee Chair

Timothy S. Newman

Committee Member

Ramazan Aygun

Committee Member

B. Earl Wells

Committee Member

Huaming Zhang


Hough functions, Solar flares, Coronal mass ejections, Magnetic dipoles


In this thesis, a new Hough-based method to automatically detect dipole- shaped structures is presented. The new method uses a set of three-piecewise- parabolic arcs to detect dipole structures in imagery (e.g., coronal images). The mathematical characteristics of the dipole structures are studied and utilized in the new method. For a given dipole curve, the coefficients of the first order term for all the piecewise parabolas are identical. Moreover, the products of the zeroeth order and second order terms are constant. Furthermore, the concentric properties of dipole curves are also discussed. The new method is tested in different images including coronal images and iron filing images. Results and analysis is also presented.



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