The convergence of mobile technologies, media, and the Internet is transforming the way that digital content is produced, distributed, and consumed, especially among children and young adults. In Europe as in many other areas, minors are exposed to an ever-growing amount of digital content on mobile phones, tablets, or computer screens. Increasing exposure at an early age brings both new opportunities and risks. This paper reviews the current discussion about strategies that deal with inappropriate, harmful, and illegal content online and proposes a particular co-regulatory, technology-driven approach based on the active involvement of children, their families, and the educational system. The MediaKids project aims to test this coregulatory approach by developing a mobile application-the MediaKids app-within the broader context of an educational programme to raise awareness about online safety. The project seeks to involve children and young adults in defining the notion of "harmful content" and, ultimately, in the elaboration of the policies for the emergent digital public space.
The aim of this paper is to enhance the coding performance obtained for images that contain regions without information, here named as no-data regions, within the JPEG2000 framework. In Remote Sensing and in Telemedicine, no-data regions can be produced due to several factors, such as geometric corrections, overlapping of successive layers of information, the interest of the user/application in only certain regions within the image, etc. Most coding systems are not devised to consider such regions separately from the rest of the image, sometimes causing a loss in the coding efficiency. We propose four techniques that address this issue. Experimental results, performed on data from real applications, suggest that the proposed techniques can achieve, in some cases, a PSNR improvement of about 2.5 dB.
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