Dr. L. T. Bruton, Department of Electrical and Computer Engineering, University of Calgary, Calgary, Alberta, Canada
There is a myriad of applications of multidimensional (MD) discretedomain filters of which the use of 2D filters for image enhancement is possibly the most widely known. The increasing computational power and decreasing cost of modern signal processing hardware is now facilitating a number of emerging applications for 3D filters, especially where one of the dimensions is time and the remaining dimensions are spatial. For example, real-time 2D and 3D directional beam forming digital filters for the enhancement, jamming and tracking of plane waves are now realizable over frequency ranges that span the seismic, sonar, audio, ultrasonic and radio-frequency spectra. Some useful 2D and 3D filter structures are considered, including 3D filter banks, and major practical limitations are described for both IIR and FIR implementations, including stability, complexity and processing speed. Potential applications of 3D frequency-planar, wedge and cone filters are summarized, including video object-tracking, video object-segmentation, the synthesis of 3D-movies and the real-time watermarking of video. An application of 4D filters for object-extraction in computer graphics is described and demonstrated. Finally, some outstanding research problems in the design and implementation of 3D and 4D filter problems are identified.
Len T. Bruton is a Professor of Electrical and Computer Engineering at the University of Calgary. His current research in the field of signal processing is focused on the synthesis, design, implementation and applications of real-time 3D and 4D filters. He has contributed a number of innovations in analog and digital filter design and his research work has been widely recognized, including his election as a member of the Royal Society of Canada, as a Fellow of the IEEE and as a recipient of the Jubilee Gold Medal of the IEEE Circuits and Systems Society. He has also been deeply involved in the establishment of national and regional research centres and in university administration, including the founding of the Faculty of Engineering at the University of Victoria and as Vice-President (Research) at the University of Calgary. He has received a number of national and international awards in recognition of his leadership in the profession of engineering.
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