Reduced-Reference Image Quality Assessment Based on Edge Preservation

Assessing the subjective quality of processed images through an objective quality metric is a key issue in multimedia processing and transmission. In some scenarios, it is also important to evaluate the quality of the received images with minimal reference to the transmitted ones. For instance, for closed-loop optimisation of image and video transmission, the quality measure can be evaluated at the receiver and provided as feedback information to the system controller. The original images - prior to compression and transmission - are not usually available at the receiver side, and it is important to rely at the receiver side on an objective quality metric that does not need reference or needs minimal reference to the original images. The observation that the human eye is very sensitive to edge and contour information of an image underpins the proposal of our reduced reference (RR) quality metric, which compares edge information between the distorted and the original image. Results highlight that the metric correlates well with subjective observations, also in comparison with commonly used full-reference metrics and with a state-of-the-art reduced reference metric. © 2012 ICST Institute for Computer Science, Social Informatics and Telecommunications Engineering.

Pushed to the Edge: Inclusion and Behaviour Support in Schools

While debates rage about educational inequality and the best way to tackle attainment gaps, a pervasive form of inschool segregation is going largely unremarked upon. Internal behaviour support units have become common fixtures in British schools. Young people may be removed from mainstream classrooms for weeks, months or even years to undergo rehabilitative programmes that incur little monitoring or oversight. This original book is the first to provide a detailed insight into the politics and practices of internal school exclusion, highlighted through the experiences of the young people attending the units. Ambitious in its scope, it draws on intensive ethnographic research with pupils, their teachers and parents to address broad questions around social justice, equal opportunities and institutional racism. It will appeal to students, researchers and practitioners in education, social policy, sociology and beyond.