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
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