Speckle noise reduction
Speckle noise reduction
Speckle noise reduction
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
<strong>Speckle</strong> <strong>noise</strong> <strong>reduction</strong>: a review – Ph. Courmontagne<br />
10<br />
‣ Kuan filter [Kuan, 1987]<br />
Adaptive Filters – 1 st form<br />
Multiplicative <strong>noise</strong> model transforms into a signal-dependent additive <strong>noise</strong><br />
model + Minimum mean square error criterion<br />
‣ Modified Kuan filter [Lu, 1996]<br />
The Kuan filter derives from a linear approximation (1 st order Taylor<br />
expansion) Modified Kuan: the approximation is extended to 2 nd order<br />
Taylor expansion<br />
‣ Adaptive Frost filter [Frost, 1982]<br />
Equals to Wiener filter adapted to speckle model<br />
‣ Enhanced Frost filter [Lopes, 1990]<br />
Same approach as for the enhanced Lee filter
Change language