Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
We assessed quality of iPPG by signal-to-noise ratio and estimated amount of motion by averaged interframe difference, see Section Data analysis. In epochs with more motion, signal-to-noise ratio decreases, which reflects the adverse influence of motion on iPPG signal quality. Note the inverted y-axis for motion (averaged interframe difference).
