Median filter
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United States of America Patent
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-
Aug 11, 1992
Grant Date -
N/A
app pub date -
Mar 11, 1991
filing date -
Mar 23, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In a median filter, signals received at the input are fed to a cascade of delay elements whose number is equal to the degree N of the median filter. The signals at the outputs of the delay elements which preceded the signal received at the input are fed to N subtracters which form the differences between the signal at the input and the N preceding signals. The signs of the differences are stored in shift registers, and upon receipt of a new signal at the input, they are shifted by one place. From the signs of the differences, the selection unit determines the median as the signal for which N/2 differences have negative signs and N/2 differences have positive signs.
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