In this paper image processing techniques are applied to satellite radar image data. Interferometric phase image is generated by two complex Synthetic Aperture Radar (SAR) images. Fringe lines are the patterns that characterize an interferometric phase image. Clear and continuous fringe lines result to an easy and efficient further processing. An automatic algorithm for extracting continuous fringe lines from the interferometric phase image is presented. Comparison with one existing method from the literature is also made. Experimental results of the algorithm are shown with simulated and real SAR interferometric ERS-1/2 SAR phase image.