Paper Reading #13: Combining Multiple Depth Cameras and Projectors for Interactions On, Above, and Between Surfaces


Reference
Authors: Andrew D. Wilson Hrvoje Benko
Affiliations: Microsoft Research,One Microsoft Way, Redmond, WA
Presentation: UIST’10, October 3–6, 2010, New York, New York, USA

Summary
Hypothesis
This paper presents an interface system called LightSpace, which is a "small room installation" comprised of projectors and depth cameras. The paper hypothesizes that LightSpace allows the user not only to manipulate virtual objects through touch on multiple surfaces, but also allows the user to transfer objects between surfaces (and other multi-surface interactions) as well as "hold" a virtual object in their hand.

Contents
The objectives are achieved the through the use of multiple projectors for displaying information everywhere in the room, along with depth sensing cameras like the one currently used in the Microsoft Kinect. The depth cameras are able to roughly reconstruct a 3-dimensional layout of the room, as well as track the movements of the user. This is what enables the system to see where the user is touching the display surfaces. The idea is to have a room as a center for interaction and commutation rather than a traditional display.

Methods
There were not any particular types of methods used to test the performance and the functionality of the system. The paper talks more about various features and how they are implemented.Users could drag a display and transform it to a wall by touching it.One of the other special feature was the ability to select the menus through spatial interaction;placing hands over it for a while. The system was presented to a group of about 800 people to use and provide feedbacks. The way people were using the system was being tracked and studied by researchers afterwards to improvise the defects.

Results
The results were pretty positive but there were some issues as well. There was a question about how many users the system could support based upon space more than the technical ability.They discovered that the interference between the user and the projector output would affect the system. They also discovered some unexpected interactions between multiple users such as "if a user touches the object on the table while another touches the wall...when those users shake hands, their connection...transfers the object form the table to the wall."

Discussion
The system shows so much of promise to me and was satisfied with the results.It reminds me about the display technologies used in movies like Minority Report and Iron Man.This technology can take us one step closer in achieving those fiction technologies.There are issues to deal with multiple number of users and the hinderance on proper use of the system to make it a better product.There can be a lot of applications of the system in day to day life like office space, meetings, design labs, medical applications and much more once the technology improves.


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