With the increasing use of multimedia technologies, image compression requires higher performance as well as new functionality. To address this need in the specific area of still image encoding, a new standard is currently being designed: JPEG2000. We will see in this paper what the exact goals are of this future standard, which applications it addresses and the current standardisation process....

At low bit rates, image compression codecs based on overlapping transforms introduce spurious oscillations known as ringing artifacts in the vicinity of major edges. Unlike previous works, we present a maximum-likelihood approach to the ringingartifact removal problem. Our approach employs a parameter-estimation method based on the -means algorithm with the number of clusters determined by a cl...

In many applications, the amount and resolution of digital images have significantly increased over the past few years. For this reason, there is a growing interest for techniques allowing to efficiently browse and seek information inside such huge data spaces. JPEG 2000, the latest compression standard from the JPEG committee, has several interesting features to handle very large images. In th...

With the increasing use of multimedia technologies and mobile devices, also increases the applications which purpose is to offer information or to do advertising by means of the sending of images or videos. In this paper, we approach a digital tourist guide scene in which mobile devices with limited resources need to receive multimedia information across a wireless connection. Also we approache...

In this paper an empirical evaluation of the lossy compression properties of the JPEG2000 standard for watermarking and fingerprinting purposes is performed. The JPEG2000 standard is used as a basic tool for determining both how and where the embedded watermark should be placed in the image. The original image is slightly modified in order to generate a similar image (but indistinguishable by t...

This paper reports an information-theoretic analysis of the dependencies that exist between curvelet coefficients. We show that strong dependencies exist in local intra-band micro-neighborhoods, and that the shape of these neighborhoods is highly anisotropic. With this respect, it is found that the two immediately adjacent neighbors that lie in a direction orthogonal to the orientation of the s...

In this paper, we propose a new efficient full reference image quality assessment metric, which is based on human visual system proprieties in order to get the best correspondence with human judgments. The suggested full reference metric is generic (independent of image distortion type). It can be used in different application such as: compression, restoration, etc. The experimental results con...

In this paper, we present a textured point-based rendering scheme that takes into account the masking properties of the human visual system. In our system high quality textures are mapped to point-based models. Given one texture, an importance map is first computed using the visual masking tool included in the JPEG2000 standard. This importance map indicates the masking potential of the texture...

Providing an environment for electronic commerce involves complex, technical questions that need to be addressed and understood by decision making bodies. This paper studies one attempt to support electronic commerce at the national level. It looks at the Regulation of Investigatory Powers Bill in the UK and focuses on the political actions of those seeking to amend the Bill in Parliament. Afte...

BACKGROUND A safe and effective vaginal microbicide could substantially reduce HIV acquisition for women. Consistent gel use is, however, of great importance to ensure continued protection against HIV infection, even with a safe and effective microbicide. We assessed the long-term correlates of consistent gel use in the MDP 301 clinical trial among HIV-negative women in sero-discordant couples ...