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A fragile watermarking scheme for secure image authentication is proposed. A scrambling encryption scheme is introduced to extend the security and increase the capacity of the fragile watermarking algorithm. The proposed algorithm not only possesses excellent tamper localization properties, but also demonstrates a new useful feature, called tamper discrimination. That is, it can indicate whether the...
Various technologies have been used to protect the copyrights of digital contents from illegal or unintentional attacks. Watermarking methods protect digital contents by embedding a watermark message into them. However they result in the degradation of digital contents and decrease the fidelity of digital contents. A fingerprinting technique can be also used for protecting digital contents. However...
Digital watermarking has been proposed as a solution to the problem of copyright protection of digital images in digital phone camera. There are two important issues that watermarking algorithms need to address. First, watermarking schemes are required to provide trustworthy evidence for protecting rightful ownership. Second, good watermarking schemes should satisfy the requirement of robustness and...
SVG (scalable vector graphic) is used to describing 2D graphics in XML, which is a text file in fact. SVG has many advantages facing to Web application, such as dynamically showing data and interactivity. As increasing usage of SVG graphics in commercial Web applications for exchanging or publishing data, unauthorized duplication and distribution of SVG data become a mandatory concern for many Web...
Many digital watermarking algorithms are proposed in the literature. Broadly these watermarking algorithms can be classified into two main categories. The first category of algorithms uses a pseudo random Gaussian sequence (PRGS) watermark whereas the second category of algorithms uses a binary logo as a watermark. The main advantage of PRGS based watermarking scheme is its ability to detect the presence...
In this paper, a genetic algorithm (GA) based video watermarking scheme in the discrete wavelet transform (DWT) domain is proposed. Scene change analysis is first conducted to decompose video into different scenes. Each frame of the video is transformed to wavelet domain by DWT. The watermark image is decomposed into 8-bit planes, scrambled and embedded into the mid-frequency DWT coefficients. The...
This paper presents a new perceptual quality metric (PQM), the improved signal to noise ratio (iSNR). The improvement is done in the following two aspects: 1) the SNR manifests much better performance in an image block of small size than in a whole image; 2) the average luminance and gradient information are added into the SNR. Next, a locally adaptive watermarking framework is described, which is...
This paper proposes an efficient watermarking technique using adaptive differential energy watermarking (ADEW) with cross binding wavelet tree (CBWT). The ADEW embeds a secret bit string using the reference threshold with experimental statistics. The proposed method not only takes advantage of the ADEWs error resilience but corrects a secret bit string by using ECC after error occurrence. Through...
This paper presents a new approach on image-adaptive spread-transform dither modulation (STDM). The approach is performed in the discrete cosine transform (DCT) domain, and modifies the original STDM in such a way that the spread vector is weighted by a set of just noticeable differences (JND's) derived from Watson's model before it is added to the cover work. An adaptive quantization step size is...
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