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Because existing systems such as [1,2] have a limited viewable range, the relative
positioning of the viewpoint, the fog and the projector are fixed.
Therefore, Yagi et al. have developed a fogscreen that can be viewed from multiple
directions by utilizing a cylindrical of screen that allows for Mie scattering and mul-
tiple calibrated projectors [5]. Meanwhile, in the Pocket Cosmos developed by Mun et
al. [6], the device which generates the fog is fitted with a 3-axis accelerometer, allow-
ing a mobile fogscreen where the fog is directed vertically.
However, although the system developed by Yagi et al. allows freedom in the rela-
tive position of the view point and the fog, the relative positions of the fog and the
projector remain fixed. And, while the device of Pocket Cosmos [9] has mobility, it
doesn't allow for multiple viewpoints, so it is likely that the image on the fog screen
can only be viewed by the person holding the device.
As mentioned above, a feature of the fogscreen is its subtle outline, and prior re-
search has suggested its application possibilities in entertainment and the arts, so if a
system could be developed which allows for multiple viewpoints and mobility, and
also the simultaneous use of multiple devices, it could contribute to the advancement
of entertainment and the arts.
Therefore we propose a method to develop a fogscreen that allows multiple view-
points and mobility, and the simultaneous use of multiple devices. And we carry out
an evaluation through the development of “HANASUI”, a system based on this me-
thod.
HANASUI is system that utilizes a portable, multi-user fogscreen for entertain-
ment. Therefore, we carry out an evaluation through actual user experience to estab-
lish whether we have in fact developed a multi-user, portable display, and achieved an
eye-catching production.
2
Proposed Method
Here we lay out the development of a portable, multi-user fogscreen using the follow-
ing method. The process we propose flow we propose is illustrated in figure 1.
1.
In order to be observable from multiple viewpoints, several projectors are used si-
multaneously.
Projection Image
PC
Projector
×
VGA
3
Calculation
position and
orientation
Rendering
Visual Contents
Fireworks device
mbed
microSD
wifi
Select Sound
Fog On/Off
Decoder IC
Speaker
Vibration
speaker
Control
signal
Supply fan
Filmed
Image
Ultrasonic
oscillator
Infrared
camera
ARMarker
Fig. 1.
System Flow
Fig. 2.
Construction of HANASUI
