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This paper proposes a RANSAC-based algorithm for determining the axialrotation angle of an object from a pair of its tomographic projections. Anequation is derived for calculating the rotation angle using one correctkeypoints correspondence of two tomographic projections. The proposed algorithmconsists of the following steps: keypoints detection and matching, rotationangle estimation for each correspondence, outliers filtering with the RANSACalgorithm, finally, calculation of the desired angle by minimizing there-projection error from the remaining correspondences. To validate theproposed method an experimental comparison against methods based on analysis ofthe distribution of the angles computed from all correspondences is conducted.

1-point RANSAC for Circular Motion Estimation in Computed Tomography (CT)