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Detect camera rotation between two 360x180 panoramic images

I have n frames of 360x180 panoramic images. I would like to determine the rotation of the camera based on a comparison of two consecutive images. For this project, we can safely assume that all the functions visible on the images are at infinity.

I am new (today) to OpenCV and must definitely do more reading. I have an application that will find KeyPoints using SIFT or SURF, but I'm not sure how to proceed here.

thank

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