Results 171 to 180 of about 7,515 (209)

Real-Time Photoplethysmography Imaging System

2011
Real-time non-contact photoplethysmography imaging (PPGI) system for high-resolution blood perfusion mapping in human skin has been proposed. The PPGI system comprises of LED lamp, webcam and computer with video processing software. The purpose of this study is to evaluate the reliability of the PPGI system when measuring blood perfusion.
U. Rubins, V. Upmalis, O. Rubenis, D. Jakovels, J. Spigulis   +4 more
openaire   +1 more source

Direct-Global Separation for Improved Imaging Photoplethysmography

2018 IEEE/CVF Conference on Computer Vision and Pattern Recognition Workshops (CVPRW), 2018
Camera-based estimation of vital signs has made significant progress in last few years. Despite of the significant algorithmic advances, the low signal-to-background ratio in video-based photoplethysmography continues to be a performance bottleneck. One of the main challenges is that much of the light returning to the camera from the subject is surface
Jaehee Park, Ashutosh Sabharwal, Ashok Veeraraghavan   +2 more
openaire   +1 more source

Intra-abdominal laparoscopic assessment of organs perfusion using imaging photoplethysmography

Surgical Endoscopy, 2023
An objective evaluation of the functional state and viability of biological tissues during minimally invasive surgery remains unsolved task. Various non-contact methods for evaluating perfusion during laparoscopic surgery are discussed in the literature, but so far there have been no reports of their use in clinical settings.Imaging ...
Victor A. Kashchenko, Alexander V. Lodygin, Konstantin Yu. Krasnoselsky, Valeriy V. Zaytsev, Alexei A. Kamshilin   +4 more
openaire   +2 more sources

Motion artifacts suppression for remote imaging photoplethysmography

2014 19th International Conference on Digital Signal Processing, 2014
Remote imaging photoplethysmography (RIPPG) is able to access human vital signs without physical contact. However most of the conventional RIPPG approaches are susceptive to motions of subjects or camera. Overcoming motion artifacts presents one of the most challenging problems.
Litong Feng, Lai-Man Po, Xuyuan Xu, Yuming Li   +3 more
openaire   +1 more source

High-precision Imaging Photoplethysmography-remote

Optica Biophotonics Congress 2025
Imaging photoplethysmography (iPPG) allows noninvasive, noncontact monitoring of heart rate, cardiac variability, and diastole-systole ratio, overcoming the limitations of the traditional method for clinical and portable applications.
N Gomez-Gonzalez, S Dominguez-Hernandez, Becerra-Martinez Liliana, M Servin, G. Paez   +4 more
openaire   +1 more source

Motion robust Imaging photoplethysmography in defocus blurring

Applications of Digital Image Processing XLII, 2019
Non-contact, imaging photoplethysmography (IPPG) uses video sequence to measure variations in light absorption, caused by blood volume pulsations, to extract cardiopulmonary parameters including heart rate (HR), pulse rate variability, and respiration rate.
Yuheng Wu, Lingqin Kong, Fei Chen, Yuejin Zhao, Liquan Dong, Ming Liu, Mei Hui, Xiaohua Liu, Cuiling Li, Weijie Wang   +9 more
openaire   +1 more source

Optimum Wavelengths in the Near Infrared for Imaging Photoplethysmography

IEEE Transactions on Biomedical Engineering, 2019
The purpose of this contribution is to determine the ideal near infrared wavelength bands for monochromatic and dual-band remote heartbeat detection using imaging photoplethysmography (iPPG) of the forehead.Experimental data of 38 healthy volunteers has been recorded and analyzed. For the data acquisition, a fast hyperspectral imager has been used.
Felicia Wurtenberger, Tobias Haist, Carsten Reichert, Andreas Faulhaber, Tobias Boettcher, Alois Herkommer   +5 more
openaire   +2 more sources

Photoplethysmography Imaging and Common Optical Hybrid Imaging Modalities

2018
Due to their obvious advantages, active and passive optoelectronic sensor concepts for monitoring cardiorespiratory vital signs and detection of rhythmical phenomena in dermal blood perfusion are being investigated by various biomedical groups, particularly their camera-based variants.
Vladimir Blazek, Stephan Dahlmanns, Carina Barbosa Pereira, Xinchi Yu, Nikolai Blanik, Steffen Leonhardt, Claudia Rosa Blazek   +6 more
openaire   +1 more source

Novel instrumental markers of proximal scleroderma provided by imaging photoplethysmography

Physiological Measurement, 2020
Instrumental identification of proximal scleroderma, which is necessary for the early diagnosis of systemic sclerosis (SSD), has not yet been developed. The aim of this study was to assess the potential diagnostic value of the imaging photoplethysmography (IPPG) method in patients with SSD.The study enrolled 19 patients with SSD and 21 healthy subjects
Oleg V Mamontov, Tatiana V Krasnikova, Maxim A Volynsky, Natalia A Anokhina, Evgeny V Shlyakhto, Alexei A Kamshilin   +5 more
openaire   +2 more sources

Wavelet Based Measurement on Photoplethysmography by Smartphone Imaging

Applied Mechanics and Materials, 2013
[Purpose] Smartphones video cameras can be used to detect the photoplethysmograph (PPG) signal.The pulse wave signal detected by smartphone always mixed mass noise because of finger moving, unevenness of pressure and outer light interference. Previous studies limit to the filtering algorithm that denoising signals, without considering characteristics ...
Bin Ju, Yun Tao Qian, Huo Jie Ye
openaire   +1 more source