Author: valia

SACHI Seminar: A neurodynamical model of luminance perception by Olivier Penacchio

SACHI seminar

Title: A neurodynamical model of luminance perception

Speaker: Olivier Penacchio, University of St Andrews

Abstract:
The perception of such simple visual features as black, greys and white may sound simple. However, the luminance we perceive, also called brightness, does not match the luminance as physically measured. Instead, the perceived intensity of an area is modulated by the luminance of surrounding areas. This phenomenon is known as brightness induction and provides a striking demonstration that visual perception cannot be considered a simple pixel-wise sampling of the environment.

The talk will start with an overview of the classical examples of brightness induction and a quick look at the different theories underlying this phenomenon. We will next introduce a neurodynamical model of brightness induction, recently published*. This model is based on the architecture of the primary visual cortex and successfully accounts for well-known psychophysical effects both in static and dynamic contexts. It suggests that a common simple mechanism may underlie different fundamental processes of visual perception such as saliency and brightness perception. Finally, we will briefly outline potential applications in the arena of computer vision and medical imaging.
* Penacchio O, Otazu X, Dempere-Marco L (2013) A Neurodynamical Model of Brightness Induction in V1. PLoS ONE 8(5): e64086. doi:10.1371/journal.pone.0064086

Event details

  • When: 11th June 2013 13:00 - 14:00
  • Where: Cole 1.33a
  • Format: Seminar

SACHI Seminar: Modeling and Analyzing development of scripts by Vinodh Rajan

SACHI Seminar

Title:

Modeling and Analyzing development of scripts

Speaker: Vinodh Rajan, University of St. Andrews

Abstract:
Human handwriting is a process that often generates variable output. Scripts generally begin with characters possessing consistent shape. But the effects of variations tend to accumulate and modify the scripts’ appearance over time. The talk will start with a brief overview of scripts and related concepts. Then the example of the Brahmic family of scripts will be addressed, and in particular the variations that led to their development.This will be followed by a general introduction to handwriting modeling methods along with techniques such as trajectory reconstruction, stroke segmentation and stroke modeling. There will further be a discussion of methods and techniques to model and analyze development of scripts, with prospective applications, and lastly there will be a demo of what was achieved so far.

Bio:
Vinodh Rajan is a PhD student based within the School of Computing, here at the University of St. Andrews. Read more about Vinodh here.

Event details

  • When: 28th May 2013 13:00 - 14:00
  • Where: Cole 1.33a
  • Format: Seminar

SACHI Seminar: The SUM framework by Kyle Montague

SACHI Seminar

Title:

The SUM framework: An Exploration of Shared User Models and Adaptive Interfaces to Improve Accessibility of Touchscreen Interactions

Speaker: Kyle Montague, University of Dundee

Abstract:
Touchscreens are ever-present in technologies today. The large featureless sensors are rapidly replacing the physical keys and buttons on a wide array of digital technologies, the most common is the mobile device. Gaining popularity across all demographics and endorsed for their superior interface soft design flexibility and rich gestural interactions, the touchscreen currently plays a pivotal role in digital technologies. However, just as touchscreens have enabled many to engage with digital technologies, its barriers to access are excluding many others with visual and motor impairments. Continue reading

Event details

  • When: 14th May 2013 13:00 - 14:00
  • Where: Cole 1.33a
  • Format: Seminar

SACHI Seminar: Digital tabletops: in the lab and in the wild by Patrick Olivier, Newcastle University

SACHI seminar

Title: Digital tabletops: in the lab and in the wild

Speaker: Patrick Olivier, Culture Lab, Newcastle University

Abstract:
The purpose of this talk will be to introduce Culture Lab’s past and current interaction design research into digital tabletops. The talk will span our interaction techniques and technologies research (including pen-based interaction, authentication and actuated tangibles) but also application domains (education, play therapy and creative practice) by reference to four Culture Lab tabletop studies: (1) Digital Mysteries (Ahmed Kharrufa’s classroom-based higher order thinking skills application); (2) Waves (Jon Hook’s expressive performance environment for VJs); (3) Magic Land (Olga Pykhtina’s tabletop play therapy tool); and (4) StoryCrate (Tom Bartindale’s collaborative TV production tool). I’ll focus on a number of specific challenges for digital tabletop research, including selection of appropriate design approaches, the role and character of evaluation, the importance of appropriate “in the wild” settings, and avoiding the trap of simple remediation when working in multidisciplinary teams.

Bio:
Patrick Olivier is a Professor of Human-Computer Interaction in the School of Computing Science at Newcastle University. He leads the Digital Interaction Group in Culture Lab, Newcastle’s centre for interdisciplinary practice-based research in digital technologies. Their main interest is interaction design for everyday life settings and Patrick is particularly interested in the application of pervasive computing to education, creative practice, and health and wellbeing, as well as the development of new technologies for interaction (such as novel sensing platforms and interaction techniques).

Event details

  • When: 7th May 2013 13:00 - 14:00
  • Where: Cole 1.33a
  • Format: Seminar

SACHI Seminar: Subtle Gaze-Dependent Techniques for Visualising Display Changes in Multi-Display Environments, by Jakub Dostal, University of St. Andrews

Abstract:

Modern computer workstation setups regularly include multiple displays in various configurations. With such multi-monitor or multi-display setups we have reached a stage where we have more display real-estate available than we are able to comfortably attend to. This talk will present the results of an exploration of techniques for visualising display changes in multi-display environments. Apart from four subtle gaze-dependent techniques for visualising change on unattended displays, it will cover the technology used to enable quick and cost-effective deployment to workstations. An evaluation of the technology as well as the techniques themselves will be presented as well. The talk will conclude with a brief discussion on the challenges in evaluating subtle interaction techniques. Continue reading

Event details

  • When: 5th March 2013 13:00 - 14:00
  • Where: Cole 1.33a
  • Format: Seminar