Web Agents

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Web Agents
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What does this animation mean and what is the
function of motion in it?
Web Agents
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Click action button now!
Assistants
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Why cant elephants fly?
Hello, I am Froggy. Let me tell you about
jumping graphics
visualization
Can I help you with your motion management?
I am Crabby, your friendly assistant
Assistants
Motion
is important for drawing attention to a topic
or to explain a process.
If the info-motion ratio is not obeyed, however,
motion can be an annoying distraction
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Motion
visualization
is important for drawing attention to a topic or
to explain a process. If the info-motion ratio is
not obeyed, however, motion can be an
annoying distraction
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In information contexts (kiosks, Web sites, ppt)
informative motion Info-motion ratio
_______________________________ total motion
used in the graphic
proportion of a graphics motion devoted to
the non-redundant display of information
1.0 - proportion of a graphics motion that can
be erased without loss of information
After data-ink ratio by Tufte (1995, p. 93)
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Does the following Web site comply with
info-motion ratio?
Click action button now!
Gamble
(AltEnter for Full Screen)
No. Motion is not strictly necessary to know what
this site is about
But does the motion have a function yet?
Yes, because here motion is informative for the
experience of entering a casino
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The casino example teaches us that info-motion
ratio is restricted by the goal of a
representation - cognitive information -
emotional experience And therefore, by genre -
information kiosk, science ? attentional focus
(effort) - entertainment, gaming, art ?
attentional diffusion (relaxing) For pure
information, info-motion ratio is applicable For
entertainment, the value for motion in the
denominator of the fraction can be much larger
than tolerated by info-motion ratio
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In entertainment contexts (games, animation
movies)
joy motion Joy-motion ratio
_______________________________ total motion
used in the graphic
proportion of a graphics motion devoted to
the non-redundant display of entertainment
1.0 - proportion of a graphics motion that can
be erased without loss of entertainment
Against data-ink ratio by Tufte (1995, p. 93)
http//www.unm.edu/kballar/heraldry/rampart/kingd
om/entertainers.gif
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Does the Bounce This! animation comply with
joy-motion ratio?
Click action button now!
Bounce
Yes, the motion adds to telling the story. In
particular the bouncing can be represented more
naturally by animation than cartoon
However, there is a motion repetition constraint
The walking and bouncing are looping sequences,
which render boredom
The making of the green ball is a sequence of
different motion frames, which renders interest
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In entertainment
Predictable motion sequences ? not enough effort
for viewer ? boring
Unpredictable motion sequences ? too much effort
for viewer ? fatiguing
Predictable sequences with different motion
frames ? just enough effort ? interest
Design trade-off Motion loops are cheap and
easily made but boring Motion diversity is costly
and hard work but interesting
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EXTRA GROUP EXERCISE (In pdf reader Exercise 5)
Develop a measure for applying motion in
infotainment or edutainment by combining the
info-motion ratio with the joy-motion
ratio Enter your answers in the discussion
group (http/teletop.few.vu.nl gt Cursus 02400075
gt Discussie) It is allowed that your answer is a
response to others Constructive contributions
receive credits (answers are not considered right
or wrong) Who fails at contributing receives no
credits Make sure to put your name and student
number
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Seeing 3-D Slicing up and filling in
http//main.psy.ilstu.edu/faculty/redding/ Machine
VisionCurriculum/Perception.html (January 15,
2003)
A
High in visual field low on retina Left in
visual field right on retina
Computed Tomography Imaging (CT Scan, CAT Scan)
B
Human eye
C
D
D
http//www.barre.nom.fr/medical/these/pictures.htm
l (January 14, 2003)
C
B
A
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Seeing 3-D through motion (things move)
The brain interprets this as Short path is
behind long path therefore, depth
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Seeing 3-D through motion (viewer moves)
The brain interprets likewise Short path is
behind long path therefore, depth ? possibility
of train illusion
move
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Seeing 3-D through motion (motion parallax)
Focal point
Fixate on a point in space, then move head on
x-axis
Head move
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Same direction
Seeing 3-D through motion (motion parallax)
Focal point
Opposite direction
If you fixate while moving, the object in front
of focal point moves in opposite direction, the
one behind focal point in same direction
(landscape turns around y-axis)
The brain interprets The direction of
leaving visual field indicates the direction of
object motion (which is not necessarily true)
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Seeing 3-D through motion Optic Flow
Move towards expanding Optic Flow ? viewer
leans back
Move from contracting Optic Flow ? viewer
leans forward
Starfield
Rewind
(AltEnter for Full Screen)
(AltEnter for Full Screen)
(e.g., Screensaver Starfield Simulation)
(e.g., Screensaver Starfield Rewind)
http//www.people.virginia.edu/ls8j/perception/cl
ass12.htm (January 15, 2003)
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In sum
Stereoscopic view (cf. viewmaster)
The PokeScope 3D Viewer
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Now realize what the brain is doing (and more)
while seeing the 3-D animation Perk by Duan
Kastelic (2002)
Perk
(AltEnter for Full Screen)
http//www.sundanceonlinefilmfestival.com/animatio
n01_11.html (Jan. 16, 2003)
Next time Sound and music in multimedia
Next time Sound and music in multimedia
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The End
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http//www.brother.com/eu-printer/lcv/lcfig10.gif
(January 15, 2003)