# Activity Recognition Invariant to Wearable Sensor Unit Orientation Using Differential Rotational Transformations Represented by Quaternions

> Research article (Sensors, 2018) · cited 24× · AI/ML

**Wikidata**: [openalex:W2888460178](https://www.wikidata.org/wiki/openalex:W2888460178)  
**Source**: https://4ort.xyz/entity/activity-recognition-invariant-to-wearable-sensor-unit-orientation-using-differential-rotational-transformations-represe