Title :
An analog median filter with feedforward adaptation
Author :
Díaz-Sánchez, Alejandro ; Ramírez-Angulo, Jaime
Author_Institution :
Nat. Inst. for Astrophys., Opt.-& Electron., Puebla, Mexico
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;
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
DOI :
10.1109/MWSCAS.2001.986135
