Oil Spill Detection and Monitoring from Satellite Image
Gamma MAP Filter is primarily used on radar data to remove high frequency noise (speckle), while preserving high frequency features (edges). Figure 5 shows that the filter has smoothed the image, without removing edges or sharp features in the images.
 Figure 5 Enhancing radar image using FSPEC -- SAR Speckle Filters command in Xpace Figure 6 and 7 show the results of texture analysis for oil spill image. For oil spill detection Homogeneity and Angular Second Moment were found as two effective texture analyses for oil spill detection and classification. The texture measures used by this program were based on R.M. Haralick et al. 1973 & 1979 and R. W. Conners et al.1980 who were demonstrated the application of textural features for image classification. These functions were applied on 32-bit image acquired from brightens value analysis. To extract detailed information about oil spill, Scaling standardized the texture values of radar image.  Figure 6 Effects of the homogeneity function of texture analysis on the image.  Figure 7 Effects of the Contrast function of texture analysis on the image. |