Abstract
The wavelet-based approach that combines a reversible round-off nonrecursive discrete periodized wavelet transform (RRO-NRDPWT) and the set partitioning in hierarchical trees (SPIHT) scheme is an efficient ECG data compression. However, this RRO-NRDPWT-based system suffers from the high complexity of the SPIHT scheme during realization. In this paper, a modified run-length coding (MRLC) algorithm is proposed towards the realization of a RRO-NRDPWT-based ECG data compression system. The MRLC with its regularity and low computational complexity is suitable for hardware implementation, but at a cost of compression performance. This sacrifice is compensated by an efficient quantization scheme. By using the MIT-BIH arrhythmia database, the experimental results show that the proposed scheme can compete with the SPIHT scheme for a compression ratio (CR) greater than 8. Hardware simulations are taken using both the Verilog logic simulator with Cadence design platform, and a Xilinx FPGA EP2C35F672C6.
Highlights
An electrocardiogram (ECG) is a non-invasive modality that senses the electric action of heart motion from the surface of a body
Complexity reduction usually leads to a sacrifice of compression performance
Realizing ECG data compression is crucial for a realtime recording of multilead ECG signals
Summary
An electrocardiogram (ECG) is a non-invasive modality that senses the electric action of heart motion from the surface of a body. Quality maintenance is usually time consuming due to the recursive process of compression and reconstruction error measurement For this reason, realizing waveletbased data compression with hardware is required to create real-time recoding of multilead ECG signals. A method based on orthogonal wavelet filters was proposed for efficient ECG data compression [7] This approach combines nonrecursive 1-D discrete periodized wavelet transform (1-D NRDPWT) and a reversible round-off linear transformation (RROLT) theorem in order to eliminate the word-length-growth effect. The RRO-NRDPWT-based ECG data compression applies the SPIHT scheme for the coding of quantized wavelet coefficients. Towards the realization of RRO-NRDPWTbased ECG data compression system, a modified run-length coding (MRLC) method is presented in place of the SPIHT scheme. The linear distortion characteristic will facilitate a rapid reconstruction quality control
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