The front mask of a passenger car composition element was quantified and it was analyzed how the front mask composition element would have affected the expression evaluation using quantification (I), and the feature of an area ratio with a composition element was clarified about the composition element of the front mask divided into each expression group. Consequently, the expression evaluation structure of a front mask has been classified into four expression groups, Happy, Angry, Bored, and Confident, centering on the pleasant and the unpleasant factor, and the awakening level factor. and the feature about the influence of the expression evaluation on each expression groups was clarified. Furthermore, in the verification of the head lamp area ratio with a composition element, it became clear that it is part of the expression group Happy. the front grille area ratio with a composition element, it became clear that it is part of the expression group Bored. the bumper opening area ratio with a composition element, it became clear that it is part of the expression group Happy.
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