TAILIEUCHUNG - Báo cáo hóa học: " Research Article A Simple Method for Guaranteeing ECG Quality in Real-Time Wavelet Lossy Coding"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article A Simple Method for Guaranteeing ECG Quality in Real-Time Wavelet Lossy Coding | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2007 Article ID 93195 9 pages doi 2007 93195 Research Article A Simple Method for Guaranteeing ECG Quality in Real-Time Wavelet Lossy Coding Alvaro Alesanco and Jose García Communications Technology Group Aragon Institute of Engineering Research University of Zaragoza 50018 Zaragoza Spain Received 3 May 2006 Revised 19 October 2006 Accepted 17 December 2006 Recommended by David Hamilton Guaranteeing ECG signal quality in wavelet lossy compression methods is essential for clinical acceptability of reconstructed signals. In this paper we present a simple and efficient method for guaranteeing reconstruction quality measured using the new distortion index wavelet weighted PRD WWPRD which reflects in a more accurate way the real clinical distortion of the compressed signal. The method is based on the wavelet transform and its subsequent coding using the set partitioning in hierarchical trees SPIHT algorithm. By thresholding the WWPRD in the wavelet transform domain a very precise reconstruction error can be achieved thus enabling to obtain clinically useful reconstructed signals. Because of its computational efficiency the method is suitable to work in a real-time operation thus being very useful for real-time telecardiology systems. The method is extensively tested using two different ECG databases. Results led to an excellent conclusion the method controls the quality in a very accurate way not only in mean value but also with a low-standard deviation. The effects of ECG baseline wandering as well as noise in compression are also discussed. Baseline wandering provokes negative effects when using WWPRD index to guarantee quality because this index is normalized by the signal energy. Therefore it is better to remove it before compression. On the other hand noise causes an increase in signal energy provoking an artificial increase of the coded signal bit rate. Clinical .

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