# HDG and HDGG: an extensible feature extraction descriptor for effective face and facial expressions recognition

> Research article (Pattern Analysis and Applications, 2021) · cited 18× · AI/ML

**Wikidata**: [openalex:W3135972681](https://www.wikidata.org/wiki/openalex:W3135972681)  
**Source**: https://4ort.xyz/entity/hdg-and-hdgg-an-extensible-feature-extraction-descriptor-for-effective-face-and-facial-expressions-recognition