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In this paper, a new method for tunable data hiding in H.264/AVC streams is presented. In order to provide the greatest flexibility for users with varying requirement, a simple control operation for capacity of hiding secret message is proposed. One group of coefficients chosen from specific macroblock is used to accommodate the secret message bits. Based on experimental results, the proposed scheme has been verified that a higher hiding capacity can be obtained at lower degradation on the bitrate and peak signal-to-noise ratio.

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