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Lip Synchronous Talking Holographic Portraits
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Ever since the application of holography
to human portraiture the possibility of
producing "talking heads" has been discussed. A variety of methodologies that
anticipated this effect have existed for
some time.
One scheme for producing
this effect made popular by audio-visual
producers and arcade amusement
makers has been the utilization of a
featureless wig head (typically
styrofoam) on to which is projected a
tightly masked motion picture image of
a human face talking. When the image
of the talking face is seen projected on
the contoured wig head along with hearing the mag striped or optical encoded
sound track of the person's voice, a
very convincing illusion takes place at a
distance.
Besides trade show applications, this technique was popularized in
an arcade machine called "Morgana".
After inserting 25 cents, the image of
"Morgana", a fortune telling gypsy,
would appear, tell your fortune, and eat
your quarters.
 Sheik
Mohammed sitting
on the 4 ft. turntable
with the Nagra and
mike for filming.
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Mark
Diamond examines
the computer
controlled talking
hologram system.
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The illusion has more
impact when viewed at a distance of at least six feet away. This is mainly because when viewed at closer distances,
the brain is able to discern that no
differential perspectives are being presented it from both eyes. In other words
the image of the tape has only monocular cues and therefore it doesn't look
quite three dimensional.
In the movie Star Wars an
attempt was made to visually suggest
the appearance of a talking, projected
image hologram. In the scene, what
appears to be a holographic image of
Princess Leah being projected into the
room by R2D2, has been created using
conventional optical and cinematic effects.
In spite of the fact that holography is not
actually used in the creation
of that scene the concept of talking
holographic images is communicated to
the audience consciousness as a distinct
possibility in the future, and not in
a galaxy far, far away, as we shall see.
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Perhaps the first appearance
of what appeared to be a talking integral hologram, was that of Michael
York in the film Logan's Run. In that
situation the motion picture camera provided the fix angle of view in a scene
where a hologram of York is being interrogated by a computer. The hologram is
heard to say, "There is no sanctuary".
In that case a voice over was utilized
and everything looks all right with the
exception of a tiny amount of time
smearing that appears on the lips. Time
smearing is an optical aberration that
sometimes occurs in integral holograms.
This phenomena can be anticipated and
rectified out of the image. It is due to
the relationship between the frame rate
of the cine camera (taking the original
footage for the holographic transfer) and
the relative movements in time of the
subjects pictured as well as the spacing
of the holograms made from the original
cine.
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