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In this paper, we focus on studying the effects of various image operations on sensor fingerprint camera identification. It is known that artifacts in the image processing pipeline, such as pixel defects or unevenness of the responses in the CCD array as well black current noise leave telltale footprints. Nowadays, camera identification based on the analysis of these artifacts is a well established...
Geographic Information System (GIS) data is a valuable asset that should be protected using digital rights management (DRM) techniques. This paper introduces a new technique for watermarking city maps by altering a basic parameter of a road segment, namely its width to length ratio. A watermark is embedded in the map using an appropriate quantization of this ratio. The watermarked map retains its...
Motion estimation is a very important topic in computer vision and image sequence compression. However, most commonly used motion estimation algorithms do not take into consideration any motion invariances that a certain local motion might possess. In this paper, a technique for estimating the invariant motion parameters of non-translational motion fields is proposed, which leads to more efficient...
Polygonal lines are key graphical primitives in vector graphics. In addition, polygonal lines can be used to define the boundary of Video Objects. The ability to apply a digital watermark to such an entity would extend the benefits of copyright protection to a wide range of data, such as Geographical Information Systems (GIS) data or MPEG-4 video.
A novel method for embedding and detecting a chaotic watermark in the digital spatial image domain, based on segmenting the image and locating regions that are robust to several image manipulations, is presented in this paper. Each selected region is approximated by an ellipse. The watermark is embedded on its bounding rectangle. This representation proves robust under geometric attacks. The controlled...
A novel method for image authentication and tamper proofing is proposed. A binary watermark is embedded in a grayscale or a color host image. The method succeeds in detecting alterations made in a watermarked image. The proposed method is robust against high quality lossy image compression. It provides the user not only with a measure for the authenticity of the test image but also with an image map...
A novel color-based two-step, coarse-to-fine video replica detection system is proposed in this paper. The first step uses an R-tree in order to perform a coarse selection of the database (original) videos that potentially match the query video. A training procedure that utilizes attacked versions of the database videos and aims at achieving robustness to attacks is being used. A frame-based voting...
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