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I guess, this: http://docs.opencv.org/modules/calib3d/doc/camera_calibration_and_3d_reconstruction.html#findhomography is more what you are looking for, since you can specify also RANSAC there, or you write RANSAC your self and use http://docs.opencv.org/modules/imgproc/doc/geometric_transformations.html?highlight=affinetransform#getaffinetransform . Good luck!