Adaptive Digital Smoothing Filter For Speckle Image Using Gamma-Filter

The synthetic aperture radar (SAR) is considered as an effective scanning system for the earth surface. It is operated by using coherent electromagnetic wave (EMW) which lie in the range of microwave (MW). The importance of this system has been increased through the last few decades, because it has been found as to be very efficient scanning tool, does not affected by weather ondition, and can be usedat all days time. The main shortcoming associates with this imaging system is the speckle noise (coherent fading), which is causes by the coherent nature of the EMW. Since SAR images have been found as to be an important source of visual data found very useful for various applications, therefore, recently, large attention have been devoted to study and nhance this type of images. Accordingly, this paper is considered as to one of these studies. In present paper we describes a smoothing scheme applied to SAR images. Here we present the results of testing the Gamma speckle reduction filter with window size (7×7) and (9×9) in order to examine its ability to aid feature extraction.