Heart diseases and stroke are considered among the world’s leading causes of death and disability. To overcome the limitations of existing invasive systems of heart rate measurement the non-invasive techniques are required. As per the study and observations, Photoplethysmography (PPG) imaging technology and Thermal Imaging methods are used for capturing signals which contains pulsatile information. These signals can give us many vital parameters related to heart rate. By using these methods different techniques are available in the market with some limitations. In this paper, different PPG techniques and Thermal Imaging method which have been used for estimation of heart rate are studied. Classification of the PPG data collection methods on the basis of some factors, such as source of light, photo detector, skin part. (Author/publisher)
Abstract