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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...
In this paper, we study the effect of an entropy model in a watermarking system on two aspects: visual information measurement and united masking function. We propose a primal sketch based visual entropy model (short for PSVEM) for the watermarking system. The PSVEM is built on both image content analysis and hierarchical perception decomposition. Experimental results show that the digital watermarking...
Information entropy is often applied as one of masking effect in digital watermarking system. At present, some scholars have used entropy masking to improve the performance of their watermarking algorithm. This paper mainly introduces the entropy masking model in three different domains, and gives experiment report about utilizing spatial domain, DCT domain, and DWT domain entropy masking model in...
Text data hiding is a steganographic technique different from the secrets hiding in multimedia, such as images, audio and video. Sun et al. proposed a text data hiding scheme to divide the Chinese character into left and right parts for enhancing the capacity, which is called L-R scheme. Adopting the concepts of Sun et al.¡¦s scheme, Wang et al. proposed an improved version to incorporate the up and...
The piracy tracking is a important task in copyright protection system for the digital work. The traditional copyright protection system could not prevent the badness customer copying and reselling the digital work and could not prevent the badness author replacing the customer's fingerprint. In this paper, a novel secure scheme is proposed for the piracy tracking. In this scheme, a secure copyright...
Perceptual watermarking for video needs to take full advantage of the results of human visual system (HVS) studies. Just noticeable distortion (JND), which refers to the maximum distortion that the HVS does not perceive, gives us a way to model the HVS accurately. Since motion is a specific feature of video, estimation of the JND profile for video needs to take into account the temporal HVS properties...
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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