Is there any opencv function to calculate reprojected points?
What is the procedure to calculate reprojected points, reprojected errors and mean reprojection error from the given world points (Original coordinates), intrinsic matrix, rotation matrices and translation vector?
Is there any inbuilt opencv function for that or we should calculate manuallay?
If we have to calculate manually, what is the best way to get reprojected points?
It's not particularly clear from the question what you're trying to do, but it sounds like camera calibration. In that case, look at the calibrateCamera() function.