10-03-2012, 03:55 PM
VLSI design of median filter
Filters are linear systems employed for removal of noise from useful signals.
Conventional IIR filters and FIR filters are highly envolved. In general They are
computional algorithms requiring definite delay between input and the outputs.
However long tailed noise such as exponentional and laplasion distribution noise are
difficult to remove using conventional linear filters.
Median filters are a class of non linear filters having advantages
1. Capability to remove long tailed noise
2. Capability to preserve edge information
The most desirable property of median filters is that they are based on signal “sorting
and selection operations”. No Computation is involved. Therefore, they are the most
suitable for real time VLSI.
Uses
1. Image processing
2. Communication networks