Adaptive Processing of Multilook Complex Sar Images
ALZENEIDE DA SILVA LOPES, Edmond Nezry, Stephane Goze, R. Touzi, G.A. Solaas · 2005
As the output of the SAR data processor is a complex number, speckle reduction should take profit of the additional information contained in the phase and in the complex correlation between the different images. In order to obtain high equivalent number of looks, we develop the Complex Gaussian-Gamma MAP (Maximum A Posteriori) fdter for complex multiplicative speckle noise and for K-distributed data in the case of L separate correlated complex looks data. This filter is a combination of the usual incoherent multilook processing (Doppler spectral domain) and of an adaptive spatial averaging (image spatial domain). The solution of the filter equation is very easy to handle and is the rigorous solution of the correlated looks MAP fdter.