This paper presents a new approach for audio-signal watermarking in three-dimensional (3-D) space. The method proposed in this paper offers an efficient way of copyright protection of audio signal through a virtual-optical-imaging scheme (VOIS). The watermarking method presented here does not require the use of original signal for watermark detection. Besides, this scheme is of a high-strength security system with multiple locks and multiple keys. The embedding strategy of a watermark with a methodology of the VOIS is analyzed in detail under the framework of Fourier optics. The embedded watermark is robust to normal signal manipulations. Numerical simulation results show a good agreement with theoretical prediction.
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Document Type: Research Article
Institute of Optoelectronics, Shenzhen University and Key Laboratory of Optoelectronics Devices and Systems, 518060 Shenzhen, Guangdong Province, China
College of Precision Instrumentation and Optoelectronics Engineering, Tianjin University, 300072 Tianjin, China
Publication date: 2004-02-01