Detection of Onset and Offset of QRS Complex Based a Modified Triangle Morphology

Conference paper
Part of the Lecture Notes in Electrical Engineering book series (LNEE, volume 269)


It was important to detect onset and offset of QRS complex from ECG signal in order to accurately and effectively obtain some clinic parameters about ECG signal. Based on a conventional triangle morphology method, this paper introduced a modified triangle morphology algorithm (MTM). In the algorithm, a triangle shape was firstly built from the ECG signal processed by local normalization, and then the vertex angle of the formed triangle shape was calculated for each sample point. At last, the sample points, whose angles satisfied with some preset conditions, were regarded as onset or offset of QRS complex. Seven 12-lead ECG records obtained from the public standard database MIT-BIH twadb were employed to evaluate the proposed method. The results showed that MTM method could accurately detect onset and offset of QRS complex even though ECG signal was contaminated by baseline wander (BW), and these onset and offset of QRS complex identified by the proposed method were more reasonable than those by other methods.


ECG signal QRS complex Morphology Characteristic point 



This work was supported the National Natural Science Foundation of China (No. 61100150 and No.51207027).


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Copyright information

© Springer Science+Business Media Dordrecht 2014

Authors and Affiliations

  • Xiao Hu
    • 1
  • Jingjing Liu
    • 1
  • Jiaqing Wang
    • 1
  • Zhong Xiao
    • 1
  1. 1.Department of Electronic Information Engineering, School of Mechanical and Electrical EngineeringGuangzhou UniversityGuangzhouChina

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