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Reversible watermark implementation method of audio signal

An implementation method and technology for audio signals, which are applied in the field of information hiding and can solve problems such as large audio distortion.

Active Publication Date: 2018-11-06
UNIV OF SCI & TECH OF CHINA
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  • Abstract
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  • Claims
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Problems solved by technology

However, the audio distortion caused by the current audio reversible watermarking at the same embedding rate is relatively large, how to reduce the audio distortion at the same embedding rate has become a technical problem to be solved

Method used

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  • Reversible watermark implementation method of audio signal
  • Reversible watermark implementation method of audio signal
  • Reversible watermark implementation method of audio signal

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Embodiment Construction

[0019] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0020] An embodiment of the present invention provides a method for realizing a reversible watermark of an audio signal, such as figure 1 As shown, it mainly includes the following steps:

[0021] 1. Use the first prediction model to predict the value of the left channel signal point, so as to obtain the residual.

[0022] Such as figure 2 Shown is a schematic diagram of the audio left channel signal. The value of the i-th signal point of the l...

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Abstract

The invention discloses a reversible watermark implementation method of an audio signal. The method comprises steps that a value of a left channel signal point is predicted through utilizing a first prediction model to obtain a residual error; the residual error is utilized to distinguish different smooth regions of a right channel signal, and an optimal right channel signal slip region is selected through utilizing the optimization algorithm; a value of each point in the optimal right channel signal slip region is predicted through utilizing a second prediction module, a residual error is obtained, and the spread method is utilized for embedding and extraction recovery of the watermark information. The method is advantaged in that the audio embedding capacity is improved while audio embedding distortion is greatly reduced, an original audio can be restored losslessly after watermark extraction, and the method can be applied to authenticity and nondestructive authentication of audio signals.

Description

technical field [0001] The invention relates to information hiding technology, in particular to a method for realizing reversible watermarking of audio signals. Background technique [0002] Due to traditional encryption methods, the protection and integrity authentication schemes of multimedia content cannot prevent redistribution and embezzlement. As a supplement and extension of encryption technology, digital watermark technology has developed rapidly in copyright protection and integrity authentication. Digital watermarking technology is to embed signals (images, texts, signatures, symbols with special meanings, etc.) research direction. [0003] Audio digital watermarking technology refers to embedding watermark information on digital audio. Compared with traditional audio protection methods, audio digital watermarking technology cannot be removed, and random changes and stripping will affect the use and quality of audio. Secondly, audio digital watermarking utilizes ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L19/018
CPCG10L19/018
Inventor 张卫明俞能海吴媛欣姚远志
Owner UNIV OF SCI & TECH OF CHINA
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