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Fast median calculation method

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4 Author(s)
J. Cadenas ; School of Systems Engineering, University of Reading, Reading, RG6 6AY, United Kingdom ; G. M. Megson ; R. S. Sherratt ; P. Huerta

The ever increasing demand for high image quality requires fast and efficient methods for noise reduction. The best-known order-statistics filter is the median filter. A method is presented to calculate the median on a set of N W-bit integers in W/B time steps. Blocks containing B-bit slices are used to find B-bits of the median; using a novel quantum-like representation allowing the median to be computed in an accelerated manner compared to the best-known method (W time steps). The general method allows a variety of designs to be synthesised systematically. A further novel architecture to calculate the median for a moving set of N integers is also discussed.

Published in:

Electronics Letters  (Volume:48 ,  Issue: 10 )