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In this paper, a new system is presented for authenticating image content using digital watermark embedding in the DWT-domain of JPEG2000. A semi-fragile signature, generated from the host signal, is embedded into the image for content verification. Generation as well as embedding of the signature is adapted to the image content for performance improvement. The system is tested extensively and performance...
In this paper, we propose a new robust image hashing approach to be used for semi-fragile image authentication. We use a texture-based feature, the so-called gray-level blob in Gaussian scale-space, which is invariant to scaling, rotation, and translation. It is associated with the image content and thus independent of image geometry. Furthermore, we show that our new approach is robust against a...
Common forward error correction is designed to correct substitution errors only. There is no detection of insertions/deletions. Such systems are usually employed in digital watermarking schemes. If watermark data is embedded selectively based on content features where desynchronization can occur during extraction, common error correction can result in bursts of errors. But there are a few techniques...
In this paper, we propose a blind geometric warping-based watermarking for images and videos. We put emphasis on high robustness and security as well as decreased complexity. Our previous works have shown that the geometric structure of images and videos is a suitable embedding domain for watermark information. To describe the geometric structure, detection or segmentation methods are used, which...
In this paper, we present a study of video-quality relevant warping parameters. Motivation of our work is to estimate the influence of warping on the quality of videos. This is required for watermarking embedding and attacking approaches that base on warping of images or videos. Therefore, we propose a universal set of parameters, which can be used to describe any warping field. Aim is to estimate...
The recognition of digital audio data manipulation is a challenge addressed by various fragile and content-fragile watermarking algorithms. But so far none of the approaches provides satisfying results with respect to manipulation detection. Especially distinguishing malicious attacks from allowed post production operations is still an open issue. In this paper we present an improvement of our content-based...
The recognition of digital audio data manipulation is a challenge addressed by various fragile and content- fragile watermarking algorithms. But so far none of the approaches provides satisfying results with respect to manipulation detection. Especially distinguishing malicious attacks from allowed post production operations is still an open issue. We introduce an integration of our watermarking-based...
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