An analog median filter with feedforward adaptation

Author

Díaz-Sánchez, Alejandro ; Ramírez-Angulo, Jaime

Author_Institution

Nat. Inst. for Astrophys., Opt.-& Electron., Puebla, Mexico

Volume

1

fYear

2001

fDate

2001

Firstpage

142

Abstract

The implementation of analog adaptive median filters for image processing is discussed. The adaptive median filter is based on transconductance comparators, which saturation current is adapted to act as a local weight operator. Transistor level simulations have shown excellent results in removing incidence noise. An image with 249×209 pixels corrupted with 35% salt and pepper noise, is used to test the adaptive median filter. All the simulations were made using a BSIM3 level 49 model and 1.2 μm MOSIS technology parameters

Keywords

adaptive filters; analogue processing circuits; circuit noise; circuit simulation; comparators (circuits); feedforward; image processing; median filters; 1.2 micron; 209 pixel; 249 pixel; 52041 pixel; BSIM3 level 49 model; MOSIS technology parameters; adaptive median filter; adaptive median filter test; analog adaptive median filters; analog median filter; corrupted image; feedforward adaptation; image processing; local weight operator; salt and pepper noise; saturation current; simulations; transconductance comparators; transistor level simulations; Adaptive filters; Circuit noise; Differential amplifiers; Image processing; Optical filters; Pixel; Signal processing; Transconductance; Transconductors; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 2001. MWSCAS 2001. Proceedings of the 44th IEEE 2001 Midwest Symposium on

Conference_Location

Dayton, OH

Print_ISBN

0-7803-7150-X

Type

conf

DOI

10.1109/MWSCAS.2001.986135

Filename

986135