A Study of Digital Audio Watermarking Schemes in the Wavelet Domain

Shuo-Tsung Chen

ISBN 10: 3639829247 / ISBN 13: 9783639829242

Edité par ???????, 2016

80 pages. 8.66x5.91x0.19 inches. In Stock. N° de réf. du vendeur 3639829247

Synopsis :

This book introduces two DWT-based audio watermarking schemes.Unlike the traditional entropy, we use the normalized energy instead of the probability. Thus, we redefined the entropy as an energy-proportion function that maps the low-frequency coefficients of DWT into a positive real value. Based on the invariant features and the properties of the energy-proportion function, the energy-proportion based scheme is then proposed.The second method presents an optimization-based group-amplitude quantization scheme for audio watermarking. Generally, the performance of a watermarking scheme is measured in terms of signal-to-noise ratio (SNR) and bit error rate (BER).The SNR and BER are used to measure the quality and the robustness of a watermarked audio. However, there is a trade-off between them which is still a challenge in the field of the watermarking. To overcome this problem, we propose to select these coefficients based on minimizing a wavelet-based functional. Finally, we obtained an important formula for audio watermarking by using Lagrange Principle.

Détails bibliographiques

Titre : A Study of Digital Audio Watermarking ...
Éditeur : ???????
Date d'édition : 2016
Reliure : Paperback
Etat : Brand New