Internal Seminars: Dan Stoyanov and Anna Cox

Speaker: Dan Stoyanov and Anna Cox
UCL Contact: Melanie Johnson (Visitors from outside UCL please email in advance).
Date/Time: 21 May 13, 12:30 - 14:00
Venue: 6.12
Further Information:

Lunch will be from 12.30pm, as talks will start promptly at 1pm

Abstract

Title: "Surgical Vision: Instrument Detection and Model Based Localization"

Speaker: Dan Stoyanov

Abstract: Methods for detecting and localising the surgical instruments in minimally invasive surgery images are important for advanced robotic assisted interventions. While the robotic control system provides information about the tool's position in the robot coordinate frame this can have inherent inaccuracies due to the mechanical system. Vision sensors are currently a promising approach for determining the robotic instrument's position in the coordinate frame of the surgical camera. In this talk, I will describe our recent work on a vision algorithm for localising the instrument's pose in 3D leaving only rotation in axis of the tool's shaft as an ambiguity. The method is based on probabilistic supervised classification and an energy minimisation algorithm for localising the pose of a prior 3D model of the instrument within a level set framework. Preliminary results on in vivo data from MIS with traditional laparoscopic and also robotic instruments indicate that the approach is promising for use on clinical data.

Title: "Immersion in Digital Games"

Speaker: Anna Cox

Immersion is a widely valued experience when playing digital games however it is only one component of the gaming experience. In this talk, I will review our specific approach to immersion in relation to other concepts that are used to describe gaming experiences. These include: concepts that are not specific to games such as flow and attention; generic conceptualizations of the gaming experience of which immersion may form part, such as incorporation; and specific concepts around immersion, engagement and involvement such as presence. To illustrate the sorts of studies being done in this area, I will describe one experiment in detail which demonstrates a double dissociation of immersion from spatial presence.