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Weighted median filters: An analog implementation

Affiliation:	1. Instituto Nacional de Astrofísica Óptica y Electrónica, Puebla, Mexico;2. Instituto Tecnológico de Puebla, Puebla, Mexico;3. Benemérita Universidad Autónoma de Puebla, Puebla, Mexico;4. Electronic Instrumentation and Atmospheric Sciences School, University of Veracruz, Xalapa, Mexico;5. Klipsch School of Electrical and Computer Engineering, New Mexico State University, Las Cruces, NM, USA;1. Department of Electrical and Electronics Engineering, Bogazici University, Istanbul, Turkey;2. IMSE, CSIC and University of Sevilla, Spain;1. Department of Electrical and Electronics Engineering, Bogazici University, Istanbul, Turkey;2. Department of Computer Engineering, Bogazici University, Istanbul, Turkey

Abstract:	The feasibility of implementing analog CMOS VLSI weighted median filters for image and signal processing is discussed. The proposed weighted median filter uses a transconductance comparator as a basic cell, where the output saturation current is used as the weight parameter in the median filter. Experimental results of the proposed analog weighted median filter for an ON Semiconductor 0.5 μm technology through MOSIS fabricated prototype are shown.

Keywords:	Image processing VLSI Nonlinear filtering Low power CMOS
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