Thesis - Instituto de Telecomunicações

4.4. CONCLUSION 918. a T - The amplitude of the T wave;In figure 4.15 we depict these time and amplitude features.Figure 4.15: Set of features extracted from the ECG wave. All features are relative to theamplitude normalized R wave.The extracted features constitute a 53-dimensional vector f, composed by the abovementioned 8 features, plus the re-sampled mean wave with 45 points (based on 10 sequentialECG waves). Extended details of the feature extraction process can be found in [219, 220].4.4 ConclusionIn this chapter we have presented a detailed view of each of the signals used in the presentresearch. The signal modeling and processing steps, from the raw signal to a set of features,was presented, producing data that can be used by feature selection and classifier stages ina biometric identification system. These stages will be presented in the next chapter.