Method and System for Blind Audio Watermarking
First Claim
1. A method for performing at least one of embedding and extraction of audio watermark, the method comprising the following steps:
- segmenting an input audio signal into segments of fixed size;
decomposing each of said segments using multilevel Discrete Wavelet Transform (DWT) to retrieve detailed coefficients;
forming a ‘
detail coefficient matrix’
of said detailed coefficients retrieved for each level of said decomposition; and
applying Singular Value Decomposition (SVD) on said ‘
detail coefficient matrix’
to obtain three decomposed matrices including a left singular vector matrix, a right singular vector matrix and a singular value matrix containing four singular values S1, S2, S3 and S4.
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Abstract
A method and system for blind audio watermarking has been envisaged. The system embeds an in-audible watermark by modifying a predetermined singular value in the wavelet domain. The generated watermarked audio signals are robust again Gaussian noise and other watermark removal and compression attacks. Also, the system can perform watermark extraction/detection in real-time without requiring in advance, either the original audio signal or its processed parameters. Thereby, the method and system provide a real-time, efficient technique for blind audio watermarking.
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Citations
13 Claims
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1. A method for performing at least one of embedding and extraction of audio watermark, the method comprising the following steps:
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segmenting an input audio signal into segments of fixed size; decomposing each of said segments using multilevel Discrete Wavelet Transform (DWT) to retrieve detailed coefficients; forming a ‘
detail coefficient matrix’
of said detailed coefficients retrieved for each level of said decomposition; andapplying Singular Value Decomposition (SVD) on said ‘
detail coefficient matrix’
to obtain three decomposed matrices including a left singular vector matrix, a right singular vector matrix and a singular value matrix containing four singular values S1, S2, S3 and S4. - View Dependent Claims (2, 3, 4, 13)
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5. A computer-implemented system for audio watermarking comprising:
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a watermark embedding unit to embed an in-audible watermark in an input audio signal by modifying a predetermined singular value derived by performing Singular Value Decomposition (SVD) operation on said input audio signal in the Discrete Wavelet Transform (DWT) domain; and a watermark extraction unit to perform said SVD operation on a received watermarked audio signal in the DWT domain to derive singular values, said watermark extraction unit comprising an analyzer to identify an embedded watermark by comparing the derived singular values, wherein four singular values S1, S2, S3 and S4 are derived on performing said SVD operation on a received input audio/watermarked audio signal in the DWT domain. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12)
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Specification