Informatics Publishing Limited

Mohammad Ibrahim Khan ¹, Md. Iqbal Hasan Sarker ¹, Kaushik Deb ¹, Md. Hasan Furhad ²

Affiliations
1 Department of Computer Science and Engineering, Chittagong University of Engineering and Technology,Chittagong-4349, BD
2 Department of Computer Engineering and Information Technology, EUCS Lab, University of Ulsan, KR

Abstract

Many effective watermarking algorithms have been proposed and implemented for digital images and digital video. However, a few algorithms have been proposed for audio watermarking. This is due to the fact that, human auditory system (HAS) is far more complex and sensitive than human visual system (HVS). In this research work, a new method of embedding image data into the audio signal and additive audio watermarking algorithm based on Discrete Cosine Transformation (DCT) domain is proposed. First, the original audio is transformed into DCT domain. The DCT coefficients are divided into a fixed number of subsections and the energy of each subsection is calculated. Next, watermark is generated from image by image processing algorithm. Watermarks are then embedded into selected peaks of highest energy subsection. Experimental results demonstrate that the watermark is inaudible and this algorithm is robust to common operations of digital audio signal processing, such as noise addition, re-sampling, requantization and so on. To evaluate the performance of the proposed audio watermarking method, subjective and objective quality tests including Bit Error Rate (BER) and Signal to Noise ratio (SNR) are conducted.

Keywords

Audio Watermarking, Discrete Cosine Transformation, Arnold Transformation, BER, SNR.

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Pranab Kumar Dhar ¹, Mohammad Ibrahim Khan ¹, Saif Ahmad ¹

Affiliations
1 Department of CSE, Chittagong University of Engineering and Technology, BD

Abstract

Digital watermarking plays an important role for protecting digital contents from unauthorized copying. This paper proposes a new audio watermarking method based on Discrete Cosine Transformation (DCT) for copyright protection. In our proposed watermarking method, the original audio is transformed into DCT domain. The absolute values of DCT coefficients are divided into an arbitrary number of segments and the energy of each segment is calculated. Watermarks are then embedded into the selected peaks of the highest energy segment. Watermarks are extracted by performing the inverse operation of watermark embedding process. Simulation results indicate that our proposed watermarking method is highly robust against various kinds of attacks such as noise addition, cropping, re-sampling, re-quantization, MP3 compression, and echo, and achieves similarity values ranging from 13 to 32. In addition, our proposed method shows SNR (signal-to-noise ratio) values ranging from 13 dB to 24 dB.

Keywords

Copyright protection, Digital Watermarking, Discrete Cosine Transform, Sound Contents.

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