Method for measuring the heart rate through fingertip using a low-end video camera and its application in self care
01 Nov 2013-pp 1-4
TL;DR: A method for monitoring the heart rate using a low-end video camera based on extracting beat-to-beat intervals by passing the color intensity average through a processing pipeline comprised of six stages is presented.
Abstract: This article presents a method for monitoring the heart rate using a low-end video camera. The user places the fingertip on the camera lens and the software detects the periodic variations in light intensity caused by the pulsation of blood in the capillary tissue. The measurement technique is based on extracting beat-to-beat intervals by passing the color intensity average through a processing pipeline comprised of six stages. Our tests indicate a measurement error below 3 bpm, when compared to commonly available home care devices. We present a possible application of our method in the area of stress diagnosis and treatment. The application can be used at home to monitor personal health and enable individuals to perform enhanced self care.
Citations
More filters
21 Feb 2007
704 citations
01 Nov 2015
TL;DR: The neural network tools used for edge detection are presented and a proposed one that is able to perform edge detection in dental Cone Beam Computer Tomography (CBCT) images, a necessary step for the teeth 3D reconstruction is proposed.
Abstract: Edge detection is an important task in image processing, many times as part of the segmentation process. When segmentation is performed in medical imaging, one of the preferred tools is neural networks, because of their capabilities of adaptive learning and non-linear mapping. We present in this paper the neural network tools used for edge detection and we propose one that is able to perform edge detection in dental Cone Beam Computer Tomography (CBCT) images, a necessary step for the teeth 3D reconstruction.
13 citations
Cites background from "Method for measuring the heart rate..."
...It is part of the evolving field of medical informatics that embraces as well topics like home care [1-2], hospital information systems [3-4], bio-molecular analysis [5-6], etc....
[...]
01 Nov 2015
TL;DR: This paper proposes to use the crowd-sensing paradigm for monitoring the environment, especially the air quality parameters relevant for asthma patients, using affordable and available hardware platforms based on Arduino.
Abstract: Chronic diseases are the main cause of mortality in developed countries. Among them, asthma has an increasing prevalence in urban areas. We propose to use the crowd-sensing paradigm for monitoring the environment, especially the air quality parameters relevant for asthma patients. Asthma is a good candidate for participatory medicine approaches as current medical guidelines promote self-management of the disease by informed and ICT enabled patients. The paper continues our work for m-health applications for asthma patients and focuses on decentralized air quality monitoring by the patients themselves using affordable and available hardware platforms based on Arduino.
9 citations
Cites background from "Method for measuring the heart rate..."
...[9] Our goal was to develop an affordable, scalable, robust and easy to use system for air quality monitoring in real time....
[...]
13 Jul 2015
TL;DR: A new thermostat is developed that combines Langevin dynamics with the global Berendsen thermostats which is parallelized in CUDA, as well as in OpenCL, which suits the molecular dynamics algorithms.
Abstract: The simulations done in molecular dynamics (MD) are used to learn about the behavior of macromolecular systems. While analyzing large macromolecular systems, the computation can last long, many times for days, weeks and months, due to which the need of parallelization occurs for shortening the time. The graphics processing unit (GPU) yields to multithread computational capacity by the use of CUDA high-level language which suits the molecular dynamics algorithms. The OpenCL platform allows its reckoning kernels to run without difficulty on GPUs, as well as on multicore computers. We developed a new thermostat that combines Langevin dynamics with the global Berendsen thermostat which is parallelized in CUDA, as well as in OpenCL. The GPU parallelization is presented in this paper by applying stochastic dynamics, respectively the Langevin integrator, together with the Berendsen thermostat. A system of atoms is tested by taking into consideration the friction coefficient and the coupling parameter.
4 citations
Cites background from "Method for measuring the heart rate..."
...Molecular dynamics [8,12,13], branch of bio informatics [17], has been conceived almost 60 years ago in theoretical physics and it is applied in chemical physics, materials science and in the modeling of molecules [6, 14]....
[...]
30 Nov 2020
TL;DR: In this article, the authors analyze the existing developments regarding cognitive stress estimation through non-intrusive methods and propose future lines of work that would eventually support patients with cerebral palsy.
Abstract: Cerebral palsy (CP) is the most common cause of motor impairment in children and has increased globally This health problem negatively impacts the quality of a patient's life and the people in their care The literature reports the use of technological tools developed to support patients' rehabilitation; however, these are intrusive, so they are annoying and can generate stress This work aims to analyze the existing developments regarding cognitive stress estimation through non-intrusive methods This study identifies a few developments focused on rehabilitating children with CP by analyzing facial expressions with non-intrusive methods From the above, the authors propose future lines of work that would eventually support patients with CP
3 citations
References
More filters
TL;DR: Photoplethysmography is a simple and low-cost optical technique that can be used to detect blood volume changes in the microvascular bed of tissue and is often used non-invasively to make measurements at the skin surface.
Abstract: Photoplethysmography (PPG) is a simple and low-cost optical technique that can be used to detect blood volume changes in the microvascular bed of tissue. It is often used non-invasively to make measurements at the skin surface. The PPG waveform comprises a pulsatile ('AC') physiological waveform attributed to cardiac synchronous changes in the blood volume with each heart beat, and is superimposed on a slowly varying ('DC') baseline with various lower frequency components attributed to respiration, sympathetic nervous system activity and thermoregulation. Although the origins of the components of the PPG signal are not fully understood, it is generally accepted that they can provide valuable information about the cardiovascular system. There has been a resurgence of interest in the technique in recent years, driven by the demand for low cost, simple and portable technology for the primary care and community based clinical settings, the wide availability of low cost and small semiconductor components, and the advancement of computer-based pulse wave analysis techniques. The PPG technology has been used in a wide range of commercially available medical devices for measuring oxygen saturation, blood pressure and cardiac output, assessing autonomic function and also detecting peripheral vascular disease. The introductory sections of the topical review describe the basic principle of operation and interaction of light with tissue, early and recent history of PPG, instrumentation, measurement protocol, and pulse wave analysis. The review then focuses on the applications of PPG in clinical physiological measurements, including clinical physiological monitoring, vascular assessment and autonomic function.
2,836 citations
01 Jul 2012
TL;DR: Using the Eulerian Video Magnification method, the flow of blood as it fills the face is able to be visualize and the resulting signal is amplified to reveal hidden information.
Abstract: Our goal is to reveal temporal variations in videos that are difficult or impossible to see with the naked eye and display them in an indicative manner. Our method, which we call Eulerian Video Magnification, takes a standard video sequence as input, and applies spatial decomposition, followed by temporal filtering to the frames. The resulting signal is then amplified to reveal hidden information. Using our method, we are able to visualize the flow of blood as it fills the face and also to amplify and reveal small motions. Our technique can run in real time to show phenomena occurring at the temporal frequencies selected by the user.
1,263 citations
"Method for measuring the heart rate..." refers methods in this paper
...This motion is invisible to the human eye, but special algorithms can amplify the changes between successive frames (a technique called “Eulerian Video Magnification” [6])....
[...]
21 Feb 2007
704 citations
"Method for measuring the heart rate..." refers background or methods in this paper
...This window corresponds to red and near infrared wavelengths, between 720–820 nm [5]....
[...]
...The user places the fingertip on the camera lens and the software detects the periodic variations in light intensity caused by the pulsation of blood in the capillary tissue [5]....
[...]
TL;DR: In this article, the authors discuss a general class of splines having some useful characteristics for design purposes, including differentiability, degree of polynomials to be blended, the localness of the spline, which determines whether it interpolates or approximates, and the type of blending function.
700 citations
"Method for measuring the heart rate..." refers methods in this paper
...We chose Catmull-Rom coefficients because they allow for smoother splines that pass through all the control points [8]:...
[...]
01 Aug 2005
TL;DR: This paper discusses the development of image sensors for digital still cameras, and some of the current and future designs of these devices and their applications are discussed.
Abstract: Preface DIGITAL STILL CAMERAS AT A GLANCE Kenji Toyoda What Is a Digital Still Camera? History of Digital Still Cameras Variations of Digital Still Cameras Basic Structure of Digital Still Cameras Applications of Digital Still Cameras OPTICS IN DIGITAL STILL CAMERAS Takeshi Koyama Optical System Fundamentals and Standards for Evaluating Optical Performance Characteristics of DSC Imaging Optics Important Aspects of Imaging Optics Design for DSCs DSC Imaging Lens Zoom Types and Their Applications Conclusion References BASICS OF IMAGE SENSORS Junichi Nakamura Functions of an Image Sensor Photodetector in a Pixel Noise Photoconversion Characteristics Array Performance Optical Format and Pixel Size CCD Image Sensor vs. CMOS Image Sensor References CCD IMAGE SENSORS Tetsuo Yamada Basics of CCDs Structures and Characteristics of CCD Image Sensor DSC Applications Future Prospects References CMOS IMAGE SENSORS Isao Takayanagi Introduction to CMOS Image Sensors CMOS Active Pixel Technology Signal Processing and Noise Behavior CMOS Image Sensors for DSC Applications Future Prospects of CMOS Image Sensors for DSC Applications References EVALUATION OF IMAGE SENSORS Toyokazu Mizoguchi What is Evaluation of Image Sensors? Evaluation Environment Evaluation Methods COLOR THEORY AND ITS APPLICATION TO DIGITAL STILL CAMERAS Po-Chieh Hung Color Theory Camera Spectral Sensitivity Characterization of a Camera White Balance Conversion for Display (Color Management) Summary References IMAGE-PROCESSING ALGORITHMS Kazuhiro Sato Basic Image-Processing Algorithms Camera Control Algorithm Advanced Image Processing: How to Obtain Improved Image Quality References IMAGE-PROCESSING ENGINES Seiichiro Watanabe Key Characteristics of an Image-Processing Engine Imaging Engine Architecture Comparison Analog Front End (AFE) Digital Back End (DBE) Future Design Engines References EVALUATION OF IMAGE QUALITY Hideaki Yoshida What is Image Quality? General Items or Parameters Detailed Items or Factors Standards Relating to Image Quality SOME THOUGHTS ON FUTURE DIGITAL STILL CAMERAS Eric R. Fossum The Future of DSC Image Sensors Some Future Digital Cameras References
578 citations
"Method for measuring the heart rate..." refers background in this paper
...The image sensor is essentially a two dimensional matrix of photodiodes coated with filters for red, green and blue wavelengths spread in a Bayer pattern [7]....
[...]