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International Journal on Advanced Science, Engineering and Information Technology, Vol. () No. , DOI:10.18517/ijaseit...3903

Inner-Canthus Localization of Thermal Images in Face-View Invariant

Hurriyatul Fitriyah, Edita Rosana Widasari, Rekyan Regasari Mardi Putri

Abstract

Inner-canthus localization has played important role in measuring human body temperature. This is due to the theory that human core body temperature can be measured in the inner-canthus. Such measurement is useful for mass screening since it is non-contact, non-invasive and fast. This paper present an algorithm that has been developed to locate the inner-canthus. The algorithm proposed a robust method in various face-view, i.e. frontal, sided and tilted. The algorithm consisted of: face segmentation, determining face-orientation, rotating face into straight view, eye localization, and inner-canthus localization. The face segmentation used human temperature threshold of 34°C. The face orientation used trend line of middle point between each most-bottom and most-top coordinates. The face rotation was based on the gradient of the trend line. Once face is rotated, the eye location was determined using facial proportion. The inner-canthus location was determined as the highest intensities in the eye-frame. The test on 15 thermal images of faces with various view showed localization accuracy of 80% for eye-frame determination and 100% for inner-canthus localization.

Keywords:

Inner-Canthus, Thermal Images, Invariant

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