Porthole: A spatial interface to provide scrolling, zooming-in, and zooming-out

Introduction How do you see a Large Image within a Limited Screen? A successful answer A main screen to display part of the image A sub window to display the entire image

Scrolling, Zooming-in, and Zooming-out Introduction Our answer came from a Porthole. In our system, More direct, intuitive, easier access. Scrolling, Zooming-in, and Zooming-out A spatial interface to based on Porthole Metaphor

Porthole Metaphor Visual Effects while Walking around. Front-Position It describes Front-Position Far-Position Near-Position Terms View Scene Viewpoint View: an area within which we see. Scene: an image that is seen through the view. Viewpoint: a point from which we see.

The scene flows to the reverse. Porthole Metaphor Front-Position Far-Position Near-Position The scene flows to the reverse.

Front-Position Far-Position Near-Position Porthole Metaphor Front-Position Far-Position Near-Position The view is contracted and the scene is narrowed.

The view is expanded and the scene is widened. Porthole Metaphor Front-Position Far-Position Near-Position The view is expanded and the scene is widened.

Scrolling Zooming-in Zooming-out As if the scene flowed. Porthole Metaphor Scrolling Zooming-in Zooming-out As if the scene flowed. As if the scene was narrowed. As if the scene was widened.

Porthole Metaphor Front-Position Far-Position Near-Position Zooming-out Scrolling Zooming-in The Basic Idea of A spatial interface to Scrolling, Zooming-in, and Zooming-out based on Porthole metaphor

How to Realize Scrolling virtual space real space

Zooming-out Zooming-in H/h = ACCd * (xr / xhome – 1.0) +1.0 How to Realize Zooming-out Zooming-in virtual space H/h = ACCd * (xr / xhome – 1.0) +1.0 real space

A map viewer A map viewer system A screen Web cameras projects images as if you have seen through a porthole. Screen size Height 27.5cm Width 35.6cm Web cameras track the user’s viewpoint.

Framework of the system A map viewer Framework of the system

Examples of Viewing Initial Settings A map viewer 150cm Home plane Screen ACCv = 7.3 (200cm/27.5cm) ACCh = 5.6 (200cm/35.6cm) ACCd = 2.0 The vicinity of BOSTON

A map viewer Examples of Viewing Viewing of Scrolling 18cm

Examples of Viewing Viewing of Zooming-in & Zooming-out A map viewer 100cm 220cm

Front-Position, Far-Position, and Near-Position. Conclusions Contributions Porthole Metaphor was introduced as three visual effects; Front-Position, Far-Position, and Near-Position. The similarity between these three visual effects and those of Scrolling, Zooming-in, and Zooming-out was focused on. A spatial interface to Scrolling, Zooming-in, and Zooming-out was proposed based on Porthole Metaphor.