C25. Accuracy Analysis of Phase Correlation Shift Measurement Methods Applied to Egyptsat-1 Satellite

The key point of super resolution process is the accurate measuring of sub-pixel shift. Any tiny error in measuring such shift leads to an incorrect image focusing. The paper introduces methodologies of measuring small shifts using Phase correlation (PC) using different window functions, then a modified version of (PC) method using high pass filter (HPF) is introduced. Comprehensive analysis and assessment of (PC) methods shows that different natural features yield different shift measurements. It is concluded that there is no universal window function for measuring shift; it mainly depends on the features in the satellite images. Even the question of which window is optimal of particular feature is generally remains open. Here, we present the design of a method for obtaining high accuracy sub-pixel shift of phase correlation using (HPF). The proposed method makes the change, in the different locations that lack of edges, easy. It was applied to Egyptsat-1 images, since its Bands suffer from sub-pixel shift.