The subjective and ambiguous information obtained during the
evaluation of criteria by different user profiles and digital cameras
are to be given great care. Thus, we have implemented fuzzy set
theory, first proposed by Zadeh (1965), to deal with the vagueness
of human thought. The major contribution of fuzzy set theory is its
capability of representing vague data. In this work, we used a 9-
point scale represented by triangular fuzzy numbers, as suggested
by Saaty (1988). A triangular fuzzy number eA
can be defined using
the elements (a, b, c) (Fig. 1). A fuzzy set is characterized by amembership
function, which assigns to each object a grade of membership
ranging between zero and one. Such a membership function is
represented as: