Blood Pulsation Intensity Video Mapping

TL;DR

This paper presents a non-invasive, remote video-based method to measure heart rate and map blood pulsation intensity on the skin surface using a regular camera and visible light, with high accuracy and quick acquisition.

Contribution

The study introduces a novel technique for mapping blood pulsation intensity using standard video cameras, achieving accurate heart rate measurement without contact or specialized equipment.

Findings

Heart rate measurement within 1 bpm of ground truth

Blood pulsation intensity map successfully generated

Method requires less than 1 minute of video data

Abstract

In this study, we make non-invasive, remote, passive measurements of the heart beat frequency and determine the map of blood pulsation intensity in a region of interest (ROI) of skin. The ROI used was the forearm of a volunteer. The method employs a regular video camera and visible light, and the video acquisition takes less than 1 minute. The mean cardiac frequency found in our volunteer was within 1 bpm of the ground-truth value simultaneously obtained via earlobe plethysmography. Using the signals extracted from the video images, we have determined an intensity map for the blood pulsation at the surface of the skin. In this paper we present the experimental and data processing details of the work and well as limitations of the technique. ----------------------------------------- Neste estudo medimos a frequ\^encia card\'iaca de forma n\~ao invasiva, remota e passiva e determinamos o mapa da atividade de pulsa\c{c}\~ao sangu\'inea numa regi\~ao de interesse (ROI) da pele. A ROI utilizada foi o antebra\c{c}o de um volunt\'ario. O m\'etodo utiliza uma c\^amara de v\'ideo comum e luz vis\'ivel como processo de aquisi\c{c}\~ao do v\'ideo durando menos de 1 minuto. A frequ\^encia card\'iaca m\'edia encontrada tem erro em torno de 1 batimento por minuto em rela\c{c}\~ao a uma medida simult\^anea usando fotopletismografia de l\'obulo de orelha. A partir dos sinais extra\'idos das imagens de v\'ideo, determinamos um mapa da intensidade da pulsa\c{c}\~ao sangu\'inea na superf\'icie da pele. Apresentamos detalhes experimentais e de processamento dos sinais, assim como limita\c{c}\~oes da t\'ecnica.