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Rotated-correlation method along a limited portion of the isointensity contours. C1 and C2 have the intensity values I1 and I2 respectively. C0 is the middle curve having the average intensity value of C1 and C2. The correlation template in frame 1 is rotated to match the points along isointensity contour 
in frame 2, which has the same intensity value as C0 in frame 1. The displacement of 
relative to C0 has been exaggerated for clarity.
