Method for embedding and extracting digital watermark in audio signal

Abstract

The invention provides a method for embedding and extracting a digital watermark in an audio signal, belonging to the field of information hiding. A digital watermark embedding part and a digital watermark extracting part are provided in the method. The digital watermark embedding part comprises the following steps of: firstly, separating the frames of the audio signal; then, carrying out waveletpacket decomposition on each frame, calculating the masking threshold of a wavelet packet sub-band and the watermark intensity of the corresponding wavelet packet sub-band, and selecting an appropriate echo delay to complete watermark embedding; and finally, carrying out inverse wavelet packet decomposition. The digital watermark extracting part comprises the following steps of: firstly, separating the frames of the audio signal; then, carrying out wavelet packet decomposition on each frame, calculating the power cepstrum of a wavelet packet sub-band coefficient, and extracting the watermark according to the position of a peak value. By embedding the watermark in the wavelet packet sub-band, the robustness to attacks is higher, and meanwhile, the echo intensity is adaptively adjusted along with the wavelet packet sub-band. After the watermark is embedded, the perception distortion of the signal is smaller, so that the method is applicable to the copyright protection of digital audio signals.

Description

technical field [0001] The invention belongs to the field of information hiding, and in particular relates to a method for embedding and extracting a digital watermark in an audio signal. Background technique [0002] With the rapid development of computer and network technology, multimedia digital products such as digital images, audio and video increasingly need an effective copyright protection method. In addition, the information security problems of communication systems in the network environment are increasingly exposed. Digital watermarking technology provides an effective solution to the above problems. [0003] Echo hiding achieves the purpose of information hiding by introducing imperceptible echoes in the original sound. Compared with other audio information hiding methods, echo hiding has the following advantages: the hiding algorithm is simple, the algorithm does not generate noise, the hiding effect is good, and sometimes the sound is thicker due to the intro...

AI Technical Summary

Problems solved by technology

[0004] Analyzing the research progress of echo hiding in recent years, most of the research on its embedding algorithm focuses on the transformation of the "kernel". Embedding algorithms based on bipolar echo kernels and bidirectional echo kernels have emerged. The embedding is completed on the above, and its complexity is high

Jae-Won Cho proposed echo embedding in the wavelet subband domain, but the wavelet decomposition failed to effectively describe the auditory perception characteristics of the psychoacoustic model, and its echo intensity did not achieve frame-level adaptation, and the steganographic signal Objective quality SNR is not very ideal

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