Screen-based assessment

A new screen scanning system based on clustering screen objects

Many physically challenged users cannot interact with a computer through a conventional keyboard and mouse. They may interact with a computer through one or two switches with the help of a scanning mechanism. In this paper we present a new scanning technique based on clustering screen objects and then compare it with two other scanning systems by using a simulator. The analysis shows that the b...

GPU-Based Screen Space Tessellation

We propose a method for providing high quality viewdependent tessellations of certain types of parametric surfaces including B-spline surfaces. The objective is to ensure that, regadless of the camera positions, the rendered triangles will cover approximately the same number of pixels. In order to do this efficiently we use graphics hardware to sample and evaluate the surfaces. In contrast to p...

Screen-based active user authentication

ARTICLE INFO ABSTRACT Article history: We investigate if screen-based recordings of computer interactions can be used for accurate active user authentication. A dataset of screen recordings of some PC interactions (MouseMoving, Typing, Scrolling, Other) of 21 users was collected and we ran a set of experiments to help our investigation. Low-dimensional feature vectors based on histogram of opti...

Objective Quality Assessment of Screen Content Images by Structure Information

In this paper, we propose a novel full-reference objective quality assessment metric of screen content images by structure information. The input screen content image is first divided into textual and pictorial regions. The visual quality of textual regions is predicted based on perceptual structural similarity, where the gradient information is used as the feature. To estimate the visual quali...

The Technical Assessment of Software Usability with Reference to Screen