# Stress Classification Using Photoplethysmogram-Based Spatial and Frequency Domain Images

> Research article (Sensors, 2020) · cited 23× · AI/ML

**Wikidata**: [openalex:W3086323238](https://www.wikidata.org/wiki/openalex:W3086323238)  
**Source**: https://4ort.xyz/entity/stress-classification-using-photoplethysmogram-based-spatial-and-frequency-domain-images