Improved wavelet-packet compression of electrocardiogram data II: coding of compressor output and QRS clustering

Brian D. Bradie

doi:10.1117/12.255305

23 October 1996 Improved wavelet-packet compression of electrocardiogram data II: coding of compressor output and QRS clustering

Brian D. Bradie

Author Affiliations +

Proceedings Volume 2825, Wavelet Applications in Signal and Image Processing IV; (1996) https://doi.org/10.1117/12.255305
Event: SPIE's 1996 International Symposium on Optical Science, Engineering, and Instrumentation, 1996, Denver, CO, United States

Abstract

Two modifications to a wavelet packet based compression scheme for single lead electrocardiogram data have been tested for their effect upon compression performance. First, differential pulse code modulation and an adaptive arithmetic coder wee implemented to improve the coding of the major components of compressor output. The improved strategies produced a 17 percent reduction in average data rate; since all techniques were lossless, there was no effect on the quality of the reconstructed signals. Second, 'QRS clustering' was incorporated into the preprocessing stage of the algorithm. Beats of similar structure were grouped, and a separate average, vector was maintained for the dominant and non-dominant beat types found in the signal. Beat similarity was quantified using a combination of linear correlation and average, absolute, point-by-point difference. A significant reduction in coefficient data rate was anticipated; however, for the test cases used in this study, a slight increase in coefficient data rate was produced.

Citation Download Citation

Brian D. Bradie "Improved wavelet-packet compression of electrocardiogram data II: coding of compressor output and QRS clustering", Proc. SPIE 2825, Wavelet Applications in Signal and Image Processing IV, (23 October 1996); https://doi.org/10.1117/12.255305

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