Abstract
Lately, the research of rational spline function widely expanding because the designing of curve and surface, which is the additional parameter known as weight that it had. This weight use to changing the curve and surface shape to fit the real data form. Then, the interpolation method adapted in rational spline function as interpolation rational spline function, which can be constructed by using piecewise rational spline function. This method is being used to model the collection of data set to visualize the data for more the understanding the meaning of the data through the curve especially surface forms. However, the problem arises when the data become uncertain, which is unable to model them. Therefore, in this paper, we introduced fuzzy interpolation rational bicubic Bezier surface (later known as FIRBBS) which modeling the fuzzy data after had been defined by the fuzzy sets definition. The construction of FIRBBS is based on the definition of fuzzy set theory and interpolation rational bicubic Bezier surface. Then, the illustration given in figures for more understanding the method.
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