Tools for Video + Images

Paper

May 7, 2012 @ 16:30, Room: 18AB

Chair: Michael Rohs, University of Munich, Germany
TeleAdvisor: A Versatile Augmented Reality Tool for Remote Assistance - Note
Community: designCommunity: engineering
Contribution & Benefit: Describes a hands-free transportable augmented reality system, consisting of a camera and a pico projector mounted on a tele-operated robotic arm. Can support remote assistance tasks around physical objects.
Abstract » TeleAdvisor is a novel solution designed to support remote assistance tasks in many real-world scenarios. It consists of a video camera and a small projector mounted at the end of a tele-operated robotic arm. This enables a remote helper to view and interact with the workers� workspace, while controlling the point of view. It also provides the worker with a hands-free transportable device to be placed anywhere in his or her environment. Active tracking of the projection space is used in order to reliably correlate between the camera�s view and the projector space.
ACM
DragLocks: Handling Temporal Ambiguities in Direct Manipulation Video Navigation - Note
Community: engineering
Contribution & Benefit: Discusses possible interaction breakdowns in direct manipulation video navigation systems in the presence of objects pausing in the video. Presents and evaluates two solutions that modify the trajectory geometry.
Abstract » Direct manipulation video navigation (DMVN) systems allow to navigate inside video scenes by spatially manipulating objects in the video. Problems arise when dealing with temporal ambiguities where a time span is projected onto a single point in image space, e.g., when objects stop moving. Existing DMVN systems deal with these cases by either disabling navigation on the paused object or by allowing jumps in the timeline. Both of these workarounds are undesirable as they introduce inconsistency or provoke loss of context. We analyze current practices regarding temporal ambiguities and introduce two new methods to visualize and navigate object pauses. User tests show that the new approaches are better suited for navigation in scenes containing temporal ambiguities and are rated higher in terms of user satisfaction.
ACM
CamBlend: An Object Focused Collaboration Tool - Paper
Contribution & Benefit: New panoramic focus+context video collaboration system designed to facilitate the interaction with and around objects. Exploratory study showed several successful new uses & existing problems in fractured spaces.
Abstract » CamBlend is a new focus-in-context panoramic video collaboration system designed to facilitate the interaction with and around objects in a lightweight, flexible package. As well as the ability to view very high resolution local and remote video that covers a full 180° field of view, the system contains a number of tools which facilitate bi- directional pointing between two remote spaces. In the first quasi-naturalistic exploratory study on a focus-in-context video system, we show a number of unique object referencing behaviours, including un-intentional or 'implicit' pointing and a number of scenarios where this was advantageous. Additionally the study highlighted some of the problems inherent in aligning between screen-based and real-world perspectives.
ACM
Swift: Reducing the Effects of Latency in Online Video Scrubbing - Paper
Contribution & Benefit: Describes two experiments to test the effects of latency on video navigation tasks and the Swift technique which is designed to mitigate these effects.
Abstract » We first conduct a study using abstracted video content to measure the effects of latency on video scrubbing performance and find that even very small amounts of latency can significantly degrade navigation performance. Based on these results, we present Swift, a technique that supports real-time scrubbing of online videos by overlaying a small, low resolution copy of the video during video scrubbing, and snapping back to the high resolution video when the scrubbing is completed or paused. A second study compares the Swift technique to traditional online video players on a collection of realistic live motion videos and content-specific search tasks which finds the Swift technique reducing completion times by as much as 72% even with a relatively low latency of 500ms. Lastly, we demonstrate that the Swift technique can be easily implemented using modern HTML5 web standards.
ACM
Video Summagator: An Interface for Video Summarization and Navigation - Note
Contribution & Benefit: Describes a 3D video visualization-based interface for video summarization and navigation. Allows a user to quickly look into the video cube, understand the video, and navigate to the content of interest.
Abstract » This paper presents Video Summagator (VS), a volume-based interface for video summarization and navigation. VS models a video as a space-time cube and visualizes the video cube using real-time volume rendering techniques. VS empowers a user to interactively manipulate the video cube. We show that VS can quickly summarize both the static and dynamic video content by visualizing the space-time information in 3D. We demonstrate that VS enables a user to quickly look into the video cube, understand the content, and navigate to the content of interest.
ACM
Video as memorabilia: User needs for collaborative automatic mobile video production - Note
Community: design
Contribution & Benefit: Presents guidelines for designers of collaborative video production tools based on a field study of automatic remixing of audience captured video. Can assist in considering memorabilia, control and acknowledgement issues.
Abstract » Digital memorabilia, such as video remixes, can increase the value of attending music events. Remixes can be made using video clips recorded by attendees during the event; however, producing them is a laborious task. In this paper we study the prospects of an automatic video remixing and present the results of a study on users' perceptions and attitudes towards collaborative automatic mobile video production. The three findings are as follows: People assess automatic video remix memorabilia as fairly equal to amateur-made manual ones, even if the manually-created video remixes are better in overall quality; as a remixing actor, a computer can be perceived to be more trustworthy than a human remixer; and, the quality of the video remix and the publication forum of the remix outcome plays a significant role when people are deciding whether or not they need public acknowledgement for their contribution. We conclude by discussing the design implications for collaborative automatic mobile video production.
ACM