Robust audio dual watermarking algorithm based on melody feature

Audio watermarking is an effective scheme for copyright protection. A robust dual watermarking scheme based on melody feature is proposed in this paper. Melody feature can be encoded for integrity verification. And then two robust watermark methods based on discrete cosine transform(DCT) and histogram are adopted to embed the watermark into the audio, which is used to resist different attacks. Tamper can be detected by comparing the melody features in the audio. In the extraction process, two groups of watermarks are extracted, and two images can be obtained. The Brenner gradient values of these two images are calculated, and the image with smaller Brenner value is selected as the final watermark image. The experimental results show that the proposed watermarking scheme has robustness to common signal processing and synchronization attacks. The robustness of the proposed watermark is better than existing algorithms.