# A Multi-Channel Ratio-of-Ratios Method for Noncontact Hand Video Based SpO$_2$ Monitoring Using Smartphone Cameras

> Research article (IEEE Journal of Selected Topics in Signal Processing, 2022) · cited 27× · AI/ML

**Wikidata**: [openalex:W4226406172](https://www.wikidata.org/wiki/openalex:W4226406172)  
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