文档介绍：IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING, VOL. 36, NO. 6, NOVEMBER 1998 1953
Analysis of Speckle Noise Contribution
on Wavelet position of SAR Images
Marc Simard, Gianfranco DeGrandi, Senior Member, IEEE, Keith P. B. Thomson, Member, IEEE, and Goze B. Beni´ e´
Abstract—This paper describes the use of the wavelet transform basis alone [3]. Indeed, abrupt intensity changes occur in
for multiscale texture analysis. One of the basic problems is that similar ground cover types, namely, at places where, due to the
texture measures have to adapt to the peculiarity of radar images satellite finite imaging time (two adjacent frames in longitude
that contain multiplicative speckle noise. In this paper, the focus
is on the effect of speckle on the wavelet transform. The effect is are acquired roughly within 20 days), the natural target has
first assessed analytically. It is shown that the wavelet coefficients undergone radar cross-section changes. These changes are
are modulated by the multiplicative character of the speckle in most probably due to meteorological factors, such as rain
a manner that is proportional to the target mean backscattering and winds. Often, there is also a very small difference of
coefficient. The effect of speckle correlation is also demonstrated. backscatter (less than 1 dB) for different targets, such as
Wavelet position is then applied to