Catmull-Rom Spline "Smoothing"

The first part of the video shows how the track is generated based on image recognition and Catmull-Rom splines.
The second part shows the "smoothing" algorithm result correcting the natural deformation present in a hand drawn picture. But some of the imperfections are due to Catmull-Rom itself.
The spline algorithm can generated deformations based on the previous points being too "different", thus creating a misinterpretation of the curves.