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In the watermarking schemes, Just Noticeable Distortion (JND) model provides an efficient method to keep the balance between watermark's imperceptibility and robustness. Traditional JND models are not as perfect as they should be. Edge detection, which extracts content features well, improves the performance of JND models. In this paper we explore the reasons and simulate JND models based on edge...
Perceptual Watermarking should take full advantage of the results from human visual system (HVS) studies. Just noticeable difference (JND), which refers to the maximum difference that the HVS does not perceive, gives us a way to model the HVS accurately. In this paper, we exploit a combined JND model which represents additional accurate perceptual visibility threshold profile to guide watermarking...
For interactive TV (ITV) services in converged network, the DVB-based DTV and the IP-based IPTV coexist in a single dual mode set-top box (STB) and the traditional one-way DVB-CA cannot be adapted to the variation. In this paper, a simplified and secure conditional access scheme based on the simplified double layer is proposed to realize authentication and access control between servers and STBs....
In broad TV network, the broadcasting will coexist with interactive services in a single set-top-box (STB) device and the traditional unidirectional conditional access system (CAS) in DVB can't be adapted to the variation. The dual-CAS is designed based on a double layer security scheme proposed in this paper to implement the authentication and access control, key updates between servers and STBs...
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