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2017 | OriginalPaper | Buchkapitel

2. Fuzzy Qualitative Trigonometry

verfasst von : Honghai Liu, Zhaojie Ju, Xiaofei Ji, Chee Seng Chan, Mehdi Khoury

Erschienen in: Human Motion Sensing and Recognition

Verlag: Springer Berlin Heidelberg

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Abstract

This Chapter presents a fuzzy qualitative representation of conventional trigonometry with the goal of bridging the gap between symbolic cognitive functions and numerical sensing and control tasks in the domain of physical systems, especially in intelligent robotics. Fuzzy qualitative coordinates are defined by replacing a unit circle with a fuzzy qualitative circle; a Cartesian translation and orientation are defined by their normalised fuzzy partitions. Conventional trigonometric functions, rules and the extensions to triangles in Euclidean space are converted into their counterparts in fuzzy qualitative coordinates using fuzzy logic and qualitative reasoning techniques. This approach provides a promising representation transformation interface to analyse general trigonometry-related physical systems from an artificial intelligence perspective. Fuzzy qualitative trigonometry has been implemented as a MATLAB toolbox named XTRIG in terms of 4-tuple fuzzy numbers. Examples are given throughout the chapter to demonstrate the characteristics of fuzzy qualitative trigonometry.

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Metadaten
Titel
Fuzzy Qualitative Trigonometry
verfasst von
Honghai Liu
Zhaojie Ju
Xiaofei Ji
Chee Seng Chan
Mehdi Khoury
Copyright-Jahr
2017
Verlag
Springer Berlin Heidelberg
DOI
https://doi.org/10.1007/978-3-662-53692-6_2