# A Learnable Gradient operator for face presentation attack detection

> Research article (Pattern Recognition, 2022) · cited 31× · AI/ML

**Wikidata**: [openalex:W4308178021](https://www.wikidata.org/wiki/openalex:W4308178021)  
**Source**: https://4ort.xyz/entity/a-learnable-gradient-operator-for-face-presentation-attack-detection