Results 161 to 170 of about 7,515 (209)
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Imaging-photoplethysmography-guided optical microangiography
Optics Letters, 2022We report a method to image facial cutaneous microvascular perfusion using wide-field imaging photoplethysmography (iPPG) and handheld swept-source optical coherence tomography (OCT). The iPPG system employs a 16-bit-depth camera to provide a 2D wide-field blood pulsation map that is then used as a positioning guidance for OCT imaging of cutaneous ...
Qinghua He, Ruikang K. Wang
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Pulse decomposition analysis in photoplethysmography imaging [PDF]
Physiological Measurement, 2020 Abstract Objective: Photoplethysmography imaging (PPGI) has gained immense attention over the last few years but only a few works have addressed morphological analysis so far. Pulse wave decomposition (PWD), i.e. the decomposition of a pulse wave by a varying number of kernels, allows for such analyses.
Fleischhauer V. +4 more
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Near-Infrared Imaging Photoplethysmography During Driving
IEEE Transactions on Intelligent Transportation Systems, 2022Imaging photoplethysmography (iPPG) could greatly improve driver safety systems by enabling capabilities ranging from identifying driver fatigue to unobtrusive early heart failure detection. Unfortunately, the driving context poses unique challenges to iPPG, including illumination and motion.
Ewa M. Nowara +3 more
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Signal recovery in imaging photoplethysmography
Physiological Measurement, 2013Imaging photoplethysmography is an emerging technique for the extraction of biometric information from people using video recordings. The focus is on extracting the cardiac heart rate of the subject by analysing the luminance of the colour video signal and identifying periodic components.
Benjamin D, Holton +3 more
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Optimal source selection for image photoplethysmography
2016 IEEE International Instrumentation and Measurement Technology Conference Proceedings, 2016This paper presents an optimal selection on the region of interest (ROI) and color spaces to extract photoplethysmography signals from facial videos. The study is carried out under two sections; ROI selection and color space selection. We compared five different ROI selection for different regions of the face. We also investigated three color spectrums
Abul Hassan, Mohamed +5 more
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Waveform Analysis for Camera-based Photoplethysmography Imaging
2019 41st Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC), 2019With the advent of sensitive and affordable cameras, classical contact-based photoplethysmography (PPG) could be enhanced to the spatial domain. Cost-efficient cameras are available in everyday items such as smartphones or computer webcams. The PPG signal, blood volume changes in the vascularity, can be measured remotely by using the camera as a 2-D ...
Michael, Paul +6 more
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Investigating a smartphone imaging unit for photoplethysmography
Physiological Measurement, 2010Current-generation smartphones boast a video unit comprising a camera next to a white light emitting diode and this configuration would be suitable for reflection-mode bio-optical sensing and imaging applications. We demonstrate reflection photoplethysmographic (PPG) imaging using this technology on the index finger of a male volunteer during rest and ...
E, Jonathan, Martin, Leahy
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Impact of Sympathetic Activation in Imaging Photoplethysmography
2019 IEEE/CVF International Conference on Computer Vision Workshop (ICCVW), 2019Photplethysmography (PPG) is known to reflect changes in sympathetic tone. This contribution investigates the behaviour of imaging photoplethysmography (iPPG) upon sympathetic activation. To that end, we assessed the impact of a distal painful stimulus on the facial iPPG and contralateral finger PPG waveforms.
Woyczyk, Alexander +2 more
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VitalCamSet - a dataset for Photoplethysmography Imaging
2019 IEEE Sensors Applications Symposium (SAS), 2019In recent years, several approaches for Photoplethysmography Imaging have been proposed. However, the so far proposed approaches have been evaluated either on non-public datasets or on such proposed for different research scope. Therefore, we present VitalCamSet, a new dataset for PPGI allowing comparative evaluation of different algorithmic approaches.
Blocher, Timon +4 more
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