Paper Reading #12 : Enabling Beyond-Surface Interactions for Interactive Surface with An Invisible Projection


Reference

Authors:

Li-Wei Chan(PhD student), Ju-Chun Ko (PhD student),

Hsiang-Tao Wu, Hui-Shan Kao, , Home-Ru Lin(Students),

Mike Y. Chen, Jane Hsu, Yi-Ping Hung (Professors).

Affiliation: National Taiwan University

Presentation: UIST’10, October 3–6, 2010, New York, New York, USA

Summary

Hypothesis

The researchers presented a programmable infrared technique and hypothesized that it will allow touch interaction devices to have interaction with multi-touch and tangible surface objects beyond the simple surface of display.

Methods/Contents

A prototype consisting of typical rear-projection surface interaction, combined with an IR projector to display IR markers on the same surface as the user display. These IR markers, which are invisible to the human eye, are used by objects above the surface to enable them to interact with the surface and display additional information.User studies were done on the different designs created by the authors.

First task was to navigate the famous buildings and annotated photos shown on the map. They proposed the iLamp which is composed of a pocket projector attached to an IR camera. Users can simply manipulate the lamp to move the high resolution projection anywhere on the tabletop without memorizing any gestures. This was used as a method to integrate a personal tabletop system as a working desk. The iflashlight was the mobile version of ilamp.Users can inspect the fine details of a region of in-terest by simply focusing the iFlashlight toward that location. It also facilitates short-term exploration activities where users can quickly explore multiple regions in the projection display. The third type of implementation was iView.It is composed of a tablet computer attached to an IR camera, featuring an intuitive viewer to explore 3D geographical information. It was used to explore 3D buildings from above the 2D map shown on the table system.

Results

Some users flipped the iView on end with the desire to obtain a portrait view of the map scene.However, iLamp and iFlashlight do not suffer from this issue as these two devices are focused on the markers while in operation. Focus was the issue with iFlashlight compared to iLamps.Some users reported that they would like to drag the map by directly using the iFlashlight. Some users also reported moving the iView made them easily become unaware about the real scene.

The users could only see the bottom part of the building and desired to lift the iView upward to see the upper parts of the same structure. The overall impression among people was positive with the devices.

Discussion

The authors did a pretty good job in creating a 3D interactive surface with invisible markers. The system can be applied to various other fields of research and technology if the errors and flaws in interface can be mitigated. The size still might be a problem. However, I can see its application in DNA modeling where scientists can interact with objects in open space, similarly in architectural modeling as well. I would be happy to see further advancements to incorporate various natural body gestures and movements in the system.

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