# Geometric and Physical Constraints for Head Plane Crowd Density Estimation in Videos.

> Research article (2018) · cited 12× · AI/ML

**Wikidata**: [openalex:W2792843139](https://www.wikidata.org/wiki/openalex:W2792843139)  
**Source**: https://4ort.xyz/entity/geometric-and-physical-constraints-for-head-plane-crowd-density-estimation-in-videos