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| Performance Analysis of Distortion-Compensated QIM Watermarking |
| Zeng Gao-rong①②,Qiu Zheng-ding①,Zhang Chun-e① |
| ①Institute of Information Science, Beijing Jiaotong University, Beijing 100044, China; ②Department of Computer Science Teaching, Shangrao Normal University, Shangrao 334001, China |
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Abstract Concerning the distortion, robustness and decoding error probability, this paper analyses the performance of Distortion-Compensated Quantization Index Modulation (DC-QIM) watermarking scheme with a scaling factor of step. On the assumption that quantization is high resolution, a formula of decoding error probability for DC-QIM watermarking scheme is derived under the Additive White Gaussian Noise (AWGN) channel, and a distortion-robustness function is defined as a criterion characterizing the tradeoff between distortion and the robustness. In the experiment, several audio sections are selected as the hosts and their third lever wavelet detail coefficients are quantified according to watermark bit series. In term of the distortion-robustness and decoding error probability, which of different DC-QIM schemes are compared, simulation result and experimental value are in accord with predictive one when step is on the small side.
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Received: 24 December 2008
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Corresponding Authors:
Zeng Gao-rong
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2010, Vol. 32 
