I. Introduction
Crowd management is a critical point in events and public space management to avoid overcrowding leading to injuries or even death of people, as it happened in Hillsborough, UK, in 1989 in a football stadium, at Duisburg, Germany, in 2010 during the Love Parade or more recently at the Astrowold festival in Houston, USA, in 2021 [1]. A key element in this management is crowd counting, for the organizers and security staff to know in real time when the number of people in a surveillance area is increasing beyond limits.