IR THERMOGRAPHY AND IMAGE PHOTOPLETHYSMOGRAPHY : NON-CONTACT MEDICAL COUNTER MEASURES FOR INFECTION SCREENING
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Abstract
Screening based on non-contact infrared thermometers (NCITs) and
IRTGs shows promising results for mass fever screening. IRTGs were found to
be powerful, quick and non-invasive methods to detect elevated temperatures. In
the case of temperature measurement using IRTGs, regions medically adjacent to
inner canthi are preferred sites for fever screening (IEC 80601-2-59:2008), which
show good stability and correlation with body temperature. However, detection of
canthi in thermal images is challenging due to the absence of features unlike visible
images, which have sharp features that can be used for eye corner detection. We
use registration of thermal images with visible light images (also called white-light
images) to localize canthi regions in thermal images. We study the accuracy of such
multi-modal image registration in the context of canthi detection and measure the
feasibility of automatic canthi based temperature measurement as an alternative to
manual measurement.
The second part of thesis refers to the study of image photoplethysmography
(IPPG), a cost-effective and flexible method for heart rate monitoring using
videos recorded in ambient light. We use low-cost commercial grade video recording
equipment (mobile camera/Digital camera) with an ambient light source. The
study includes information about signal processing algorithms for estimating heart
rate, relevant parameters, and comparison with standard techniques. Such low-cost,
multi-purpose solutions for quick screening of subjects provides us with sensible and
useful information on elevated body temperature and heart rate. Hence, these methods
show promising results that enable mass fever screening as a possibility through
temperature and heart rate monitoring, where low cost of installation and flexibility
are important.