# From Grayscale to Color: Quaternion Linear Regression for Color Face Recognition

> Research article (IEEE Access, 2019) · cited 31× · AI/ML

**Wikidata**: [openalex:W2981451928](https://www.wikidata.org/wiki/openalex:W2981451928)  
**Source**: https://4ort.xyz/entity/from-grayscale-to-color-quaternion-linear-regression-for-color-face-recognition