Compression of ECG signal using hybrid technique

Abstract

The new method proposed here consists of a combination of two transforms. The hybrid technique consists of Discrete Cosine Transform (DCT) and 1D or 2D discrete wavelet Transform (DWT). The method is suitable for compression of ECG signals. In this research, different records of MIT–BIH data base are used. The performance measure of the technique is done with the help of Compression Ratio (CR) and Percent Root Mean Square Difference (PRD). The threshold based technique is used to achieve better CR. The threshold value is selected based on the R peak. The QRS complex is detected in order to select the R peak. The threshold level is selected as 1, 0.5, and 0.1 % of the R peak. Further improvement in the CR is achieved by the DWT decomposition method. The level of decomposition is carefully selected to achieve improved CR.