**Author details**

Yongjian Sun\* and Zihan Wang University of Jinan, Jinan, Shandong, China

\*Address all correspondence to: sunyongjian2006@163.com

© 2022 The Author(s). Licensee IntechOpen. This chapter is distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

*Perspective Chapter: On Rolling Bearing Fault Feature Extraction Based on Entropy Feature DOI: http://dx.doi.org/10.5772/intechopen.105095*
