In this paper, we investigate the scalability aspect of blind watermark detection under combined quality and resolution adaption of JPEG2000 and JPEG coded bitstreams. We develop two multi-channel watermarking schemes with blind detection, based on additive spreadspectrum watermarking: one employs the DCT domain, the other the DWT domain. We obtain watermark scalability by combining detection r...

Region Of Interest (ROI) coding is one of the innovative functionalities supported by JPEG 2000, the new ISO/ITU-T still image coding standard developed by the Joint Photographic Experts Group (JPEG). It enables a non-uniform distribution of the image quality between a selected region (the ROI) and the rest of the image (background). This feature is obtained by scaling background coefficients i...

To achieve much efficient multimedia transmission over an error-prone wireless network, there are still some problem must to be solved, especially in energy limited wireless sensor network. In this paper, we propose a joint detection based on Schur Algorithm for image wireless transmission over wireless sensor network. To eliminate error transmissions and save transmission energy, we combine Sc...

A color image adaptive watermarking scheme is proposed. To increase the robustness and perceptual invisibility, a model called ICPM (image complexity and perceptibility model) is proposed to analyze the different sub-blocks’ properties. A novel technique is proposed for the watermark casting and retrieval by utilizing the properties of the image itself. Experimental results demonstrate the robu...

This paper investigates a complementary compression concept to the JPEG 2000 standard for improving the compression efficiency of medical images, in terms of compression ratio and image quality, by introducing a denoising process before the application of the JPEG2000 compression. The case of dental radiography is assessed, where the JPEG 2000 compression standard is appropriately tuned to fit ...

An approach to watermarking digital images using non-regular wavelets is advanced. Non-regular transforms spread the energy in the transform domain. The proposed method leads at the same time to increased image quality and increased robustness with respect to lossy compression. The approach provides robust watermarking by suitably creating watermarked messages that have energy compaction and fr...

The main motivation of this paper is to analyze the impact of jpeg compression quantitatively. That is, how does compression affects the ability of measuring and comparing features in the image? A majority of processing and analyzing image techniques are based in comparing different pixel values, selected feature or entire patches in the image. These comparisons are even more important when dea...

Wavelet filters can be parametrized to create an entire family of different wavelet filters. We discuss wavelet filter parametrization as a means to add security to wavelet based watermarking schemes. We analyze the influence of the number of filter parameters and use non-stationary multi-resolution decomposition where different wavelet filters are used at different levels of the decomposition....

JPEG2000 is a family of technologies based on the image compression system defined in IS 15444-1. Presently, the ISO/IEC Joint Technical Committee of Photographic Experts (JPEG) is developing an international standard for interactivity with JPEG2000 files, called JPIP; it will become Part 9 of the standard. One of the main goals of JPIP is to exploit the multi-resolution and spatially random ac...

The paper presents an analysis of the effects of lossy compression algorithms applied to images affected by geometrical distortion. It will be shown that the encoding-decoding process results in a nonhomogeneous image degradation in the geometrically corrected image, due to the different amount of information associated to each pixel. A distortion measure named quadtree distortion map (QDM) abl...