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Astronomy: MAXIMUM A POSTERIORI TECHNIQUE FOR SMOOTHING SIMULATED SAR IMAGES

 

MAXIMUM A POSTERIORI TECHNIQUE FOR SMOOTHING

SIMULATED SAR IMAGES

*SALEHM. ALI, **A YAD A. AL. ANI & SABAH J. AL-AMR1

* Remote Sensing Unit- College of Science- University of Baghdad IRAQ- Baghdad- Al-Jaderyia ** Department of Astronomy, College of Science, University of Baghdad -Jadiryah, Baghdad, Iraq

ABSTRACT

Synthetics Aperture Radar “SAR” images contain some degree of speckle, which arises from the coherent nature of the radar waves. Several independent images of the same area, produced by using different portion of the synthetic aperture, may be averaged together to produce a smoother image. The number of independent images being averaged is called the number of looks.

In this paper, different smoothing techniques will be suggested to reduce the speckle effects. The most well-known adaptive liner filter using radar image properties rely on the multiplicative speckle model and the use of local statistics. The main technique, which is used, is the Maximum A Posteriori filter (MAP). Maximum A Posterior filter considers Gamma distributed intensity and is then more suitable to radar image.



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