基于分類器組合的心電信號(hào)身份識(shí)別算法研究
[Abstract]:At present, there are many methods for identification, such as face recognition, fingerprint identification and so on. As the technology continues to update, faces can be replaced by photographs and fingerprints can be copied, but everyone's ECG signals are unique and cannot be copied. At present, ECG signals are mainly used in the diagnosis of cardiac diseases in clinical medicine. In recent years, more and more scholars have put forward the research of identification based on ECG signals. The purpose is to achieve better and more accurate identification of human beings. The reason for the rapid development of biometric technology is precisely because of human own special behavioral characteristics or physiological identity identification. Its reliability and irreplaceable are very high. In this paper, the ECG signal identification algorithm based on classifier combination is studied. The QRS waveform is extracted by the method of extracting the feature without reference point. The HOAC-DCT feature is extracted, which is based on the combination of classifiers. Combining DWT feature extraction with PCA feature extraction and classifier combination algorithm, the proposed method can improve the accuracy of identity recognition. Firstly, the ECG signal is preprocessed in this paper. The original ECG signal is often accompanied by the noise components such as muscle frequency interference, power frequency interference, baseline drift and so on. The ECG signal is affected by the acquisition equipment and other factors, so it is necessary to filter the ECG signal. In this paper, a fourth-order Butterworth bandpass filter is used. Then the QRS waveform of ECG signal is extracted by the feature extraction method without reference point, that is, the HOAC algorithm is used to extract the normalized QRS waveform of the ECG signal and remove the influence of the reference point. Secondly, the extracted normalized QRS waveform is extracted by HOAC,DWT and PCA again. Because the feature dimension of HOAC is high, the feature dimension is reduced by DCT algorithm. Each method extracts one feature separately, after finding out three features, it uses nearest neighbor classifier to classify and recognize, and finally uses multiplication, maximum, minimum, median, majority voting rules to combine the classification results. Find out the best combination algorithm to identify the ECG signal, and realize the more accurate identification of the ECG signal. Finally, the performance of the proposed algorithm is verified by PTB and MIT-BIH database, and the accuracy result of identification is obtained by using MATLAB to verify the superiority of the proposed algorithm. The experimental results show that the combination of multiplication and median rule has the best classification ability, which is stronger than that of single feature extraction, and the classification error rate is the lowest. The proposed ECG signal identification algorithm based on classifier combination is proved to be more effective and easy to implement. It can provide good technical support for the system based on ECG identification.
【學(xué)位授予單位】:延邊大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類號(hào)】:TP391.41
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