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http://dx.doi.org/10.5762/KAIS.2015.16.6.4021

Development of a Photoplethysmographic method using a CMOS image sensor for Smartphone  

Kim, Ho Chul (Department of Radiological Science, College of Health Science, Eulgi University)
Jung, Wonsik (Samsung Electronics)
Lee, Kwonhee (Graduate Program in Bio-medical Science, Korea University)
Nam, Ki Chang (Department of Medical Engineering, Dongguk University College of Medicine)
Publication Information
Journal of the Korea Academia-Industrial cooperation Society / v.16, no.6, 2015 , pp. 4021-4030 More about this Journal
Abstract
Pulse wave is the physiological responses through the autonomic nervous system such as ECG. It is relatively convenient because it can measure the signal just by applying a sensor on a finger. So, it can be usefully employed in the field of U-Healthcare. The objects of this study are acquiring the PPG (Photoplethysmography) one of the way of measuring the pulse waves in non-invasive way using the CMOS image sensor on a smartphone camera, developing the portable system judging stressful or not, and confirming the applicability in the field of u-Healthcare. PPG was acquired by using image data from smartphone camera without separate sensors and analyzed. Also, with that image signal data, HRV (Heart Rate Variability) and stress index were offered users by just using smartphone without separate host equipment. In addition, the reliability and accuracy of acquired data were improved by developing additional hardware device. From these experiments, we can confirm that measuring heart rate through the PPG, and the stress index for analysis the stress degree using the image of a smartphone camera are possible. In this study, we used a smartphone camera, not commercialized product or standardized sensor, so it has low resolution than those of using commercialized external sensor. However, despite this disadvantage, it can be usefully employed as the u-Healthcare device because it can obtain the promising data by developing additional external device for improvement reliability of result and optimization algorithm.
Keywords
CMOS Image Sensor; Heart Rate; PPG; Smartphone; Stress Index;
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