You can read about the algorithm here: <a href="https://avikdas.com/2019/07/29/improved-seam-carving-with-forward-energy.html" rel="nofollow">https://avikdas.com/2019/07/29/improved-seam-carving-with-fo...</a>
Discussed a bit here:<p><i>Improved seam carving with forward energy</i> - <a href="https://news.ycombinator.com/item?id=20554540">https://news.ycombinator.com/item?id=20554540</a> - July 2019 (21 comments)