关键词: 粒度计算, 商空间, 模糊集, 粗糙集

Abstract: Granular computing is a tool dealing with imprecise, incomplete and uncertain knowledge, Just as a great umbrella，it may be regarded as a label of theories，methodologies，techniques，and tools that make use of granules. There is a fast growing and renewed interest in the study of granular computing. In this paper we analyze the characteristics of granularity from human recognition, and present granular computing models of quotient space theory. Then we introduce the main methods about granular computing, and carry on mutual compare with them.

Key words: Granular Computing, Quotient Space, Fuzzy Set, Rough Set