A Vector Similarity Measure for Interval Type-2 Fuzzy Sets
Dongrui Wu, Jerry M. Mendel · 2007
Fuzzy logic is frequently used incomputing with words(CWW). When input words to a CWW engine are modeled by interval type-2 fuzzy sets (IT2 FSs), the CWW engine's output can also be an IT2 FS,Ã, which needs to be mapped to a linguistic label so that it can be understood. Because each linguistic label is represented by an IT2 FSB̃i, there is a need to compare the similarity ofÃandB̃ito find theB̃imost similar toÃ. In this paper, a vector similarity measure (VSM) is proposed for IT2 FSs, whose two elements measure the similarity in shape and proximity, respectively. A comparative study shows that the VSM gives more reasonable results than all other existing similarity measures for IT2 FSs.