System and method for tissue analysis using remote PPG
AssigneeKoninklijke Philips N.V.
InventorsMarco Lai, Bernardus Hendrikus Wilhelmus Hendriks, Gerhardus Wilhelmus Lucassen, Marc Notten, Nico Maris Adriaan De Wild, Frank Verbakel, Sergei Y. Shulepov
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Abstract
A system and method for PPG analysis processes images to determine PPG signals from different image regions of the images and determine relative delays between the PPG signals for the different image regions. The time alignment between the PPG signals is improved so that a more accurate global PPG signal is obtained for the overall region of interest. In this way, PPG signals are realigned or partially realigned to provide an overall PPG signal with improved signal to noise ratio.
Claims14
A system, comprising a processor adapted to:
- receive a plurality of (photoplethysmography) PPG signals, each associated with an from different image regions in a region of interest;
- derive a reference signal from the PPG signals;
- for each signal of the PPG signals, determine a delay for the signal relative to the reference signal;
- align each signal of the PPG signals by the delay;
- and
- determine a global PPG signal for the region of interest from the PPG signals which have been aligned.
A computer-implemented method for processing images to derive remote (photoplethysmography) PPG signals, comprising:
- receiving images of a region of interest;
- determining PPG signals from different image regions of the images;
- deriving a reference signal from the PPG signals;
- for each signal of the PPG signals, determining a delay for the signal relative to the reference signal;
- align each signal of the PPG signals by the delay;
- and
- determining a global PPG signal for the region of interest by from the PPG signals which have been aligned.
A non-transitory computer-readable storage medium having stored a computer program comprising instructions to perform a method comprising:
- receiving images of a region of interest;
- determining (photoplethysmography) PPG signals from different image regions of the images;
- deriving a reference signal from the PPG signals;
- for each signal of the PPG signals, determining a delay for the signal relative to the reference signal;
- align each signal of the PPG signals by the delay;;
- and
- determining a global PPG signal for the region of interest by from the PPG signals which have been aligned.
A processor configured to:
- receive a plurality of (photoplethysmography) PPG signals, each associated with an image region in a region of interest;
- derive a reference signal from the PPG signals;
- for each signal of the PPG signals, determine a delay for the signal relative to the reference signal;
- align each signal of the PPG signals by the delay;
- and
- determine a global PPG signal for the region of interest from the PPG signals which have been aligned.
Dependencies are inferred from the claim text.