Application of Watermarking Technique to Embedding Homemade Exercise Test Data into a Standard ECG Signal

Digital watermarking is a steganographic technique for hiding the confidential data into an open message, usually employed for content authentication, proof of authorship and copy control. This tool may also be useful for broadening the measurement context by coding auxiliary digital information into the main (host) signal of variable bandwidth. In this paper we present the application of the watermarking technique to embedding in-field screening or homemade exercise test data into a standard digital ECG signal. This approach allows to track the physical load of the patient even in natural living environment with a standard Holter recording and messaging equipment with no additional data storage structures or transmission channel.

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