Send to

Choose Destination
Biomed Opt Express. 2015 Aug 11;6(9):3320-38. doi: 10.1364/BOE.6.003320. eCollection 2015 Sep 1.

Non-contact measurement of oxygen saturation with an RGB camera.

Author information

Insitute of Biomedical Engineering, University of Oxford, UK.
Department of Physiology Anatomy and Genetics, University of Oxford, UK.


A novel method (Sophia) is presented to track oxygen saturation changes in a controlled environment using an RGB camera placed approximately 1.5 m away from the subject. The method is evaluated on five healthy volunteers (Fitzpatrick skin phenotypes II, III, and IV) whose oxygen saturations were varied between 80% and 100% in a purpose-built chamber over 40 minutes each. The method carefully selects regions of interest (ROI) in the camera image by calculating signal-to-noise ratios for each ROI. This allows it to track changes in oxygen saturation accurately with respect to a conventional pulse oximeter (median coefficient of determination, 0.85).


(170.0110) Imaging systems; (170.0170) Medical optics and biotechnology; (170.1460) Blood gas monitoring; (170.1470) Blood or tissue constituent monitoring; (170.3660) Light propagation in tissues; (280.0280) Remote sensing and sensors

Supplemental Content

Full text links

Icon for PubMed Central
Loading ...
Support Center