An Accurate Matching Algorithm Research for Pseudo Periodic Sub-Series
Jing Chen · Measurement & Control Technology · 2011
In pseudo periodic series,the morphology of sub-series contains rich dynamic characteristics.Comparing with match algorithms,the morphology difference of sub-series is the premise for constructing system dynamical model.Shape exchange algorithm(SEA) is a novel pseudo periodic series matching algorithm.It can overcome the space and time scale difference of the sub-series,so it is very robust to noise and offset.SEA can not describe the amplitude difference when matching the sub-series of the same time series.A strategy of amplitude feature exchange is used to import artificial shape deviation for SEA,which is sensitive to little shape deviation.The strategy can improve the describing ability for amplitude difference remarkably.The media value is selected as an amplitude feature to protect the robustness of SEA and the offset component is eliminated beforehand.Taking ECG as an example,it is demonstrated that the modified SEA is suitable to processing sub-series matching and still maintains good robustness.