Hii , I am using cvCalibrateCamera2(....) function in opencv . Here one of the output that I get is the rotation_vectors which is Nx3 matrix . I have seen the documentation and it says look at cvRodrigues2() function for further details . And I have understood that cvRodrigues2() function converts the a 1x3 rotation vector to a 3x3 rotation matrix . My question is which 1x3 rotation vector out of the N , should be inputted to cvRodrigues2() function for calculating the Rotation Matrix ??