3 May 2016 Characterization and recognition of mixed emotional expressions in thermal face image
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Abstract
Facial expressions in infrared imaging have been introduced to solve the problem of illumination, which is an integral constituent of visual imagery. The paper investigates facial skin temperature distribution on mixed thermal facial expressions of our created face database where six are basic expressions and rest 12 are a mixture of those basic expressions. Temperature analysis has been performed on three facial regions of interest (ROIs); periorbital, supraorbital and mouth. Temperature variability of the ROIs in different expressions has been measured using statistical parameters. The temperature variation measurement in ROIs of a particular expression corresponds to a vector, which is later used in recognition of mixed facial expressions. Investigations show that facial features in mixed facial expressions can be characterized by positive emotion induced facial features and negative emotion induced facial features. Supraorbital is a useful facial region that can differentiate basic expressions from mixed expressions. Analysis and interpretation of mixed expressions have been conducted with the help of box and whisker plot. Facial region containing mixture of two expressions is generally less temperature inducing than corresponding facial region containing basic expressions.
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Priya Saha, Priya Saha, Debotosh Bhattacharjee, Debotosh Bhattacharjee, Barin Kumar De, Barin Kumar De, Mita Nasipuri, Mita Nasipuri, "Characterization and recognition of mixed emotional expressions in thermal face image", Proc. SPIE 9820, Infrared Imaging Systems: Design, Analysis, Modeling, and Testing XXVII, 98200S (3 May 2016); doi: 10.1117/12.2223935; https://doi.org/10.1117/12.2223935
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