A Wavelet-Based Digital Watermarking Technique for ECG Signals

• Main Authors: GUO,YUAN-JIE, 郭元傑
• Other Authors: HUANG,HUANG-NAN
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/09223596464019777413

碩士 === 東海大學 === 應用數學系 === 101 === In nowadays society, we pay much attention to a variety of copyright protection issues and the emphasis on personal information. Digital watermarking technology is the most widely used encryption technology in the field of multi-media and medical information. In this thesis, we redesign a wavelet-based digital watermark to Electrocardiogram (ECG) signals to achieve the purpose of protection of patient rights. Certain hidden data for personnel identification are embedded into specified low-frequency coefficients of its wavelet transform according to different quantization sizes using the quantization approach. In addition, since the proposed watermark scheme is not reversible, we evaluate the impact of watermarking to the PQRST complexes of the ECG signal in which we conclude that the impact is small and the watermarked data can meet the requirement of physiological diagnostics. In order to measure the robustness of our scheme, three attacks including noise, resampling, and low-pass filter are adopted to test the watermarked ECG data. The experimental result verifies that the proposed scheme is slightly robust than DCT- and FFT-implemented quantization watermarking techniques after testing with ECG signals from the MIT-BIH arrhythmia database.