Image Acquisition, Density, and Velocity Measurements in Dense Crowds: The Chupinazo Case Study
2025-02-09
Researchers quantified crowd density and velocity at the Chupinazo festival in Pamplona by analyzing crowd footage. They used machine learning algorithms (like P2PNet and YOLOv8) for crowd detection and Particle Image Velocimetry (PIV) for velocity field measurement, overcoming challenges like perspective distortion and shadows. High-density crowds exhibited high-amplitude motions akin to 'crowd quakes,' and a model was developed to describe the unusual frictional forces causing spontaneous chiral oscillations.
Tech
crowd dynamics