title: Photoplethysmographic imaging of high spatial resolution.
abstract: We present a new method of formation photoplethysmographic images with high spatial resolution from video recordings of a living body in the reflection geometry. The method (patent pending) is based on lock-in amplification of every pixel of the recorded video frames. A reference function required for synchronous detection of cardiovascular pulse waves is formed from the same frames. The method is featured by ability to visualize dynamic changes in cardiovascular pulse wave during the cardiac (or respiratory) cycle. We demonstrate that the system is capable to detect the minimal irritations of the body such as gentle scratching of the skin by own finger.
authors.forename: Alexei A
authors.initials: AA
authors.lastname: Kamshilin
authors.forename: Serguei
authors.initials: S
authors.lastname: Miridonov
authors.forename: Victor
authors.initials: V
authors.lastname: Teplov
authors.forename: Riku
authors.initials: R
authors.lastname: Saarenheimo
authors.forename: Ervin
authors.initials: E
authors.lastname: Nippolainen