This document discusses 3D technology and how 3D is achieved. It explains that 3D works by providing slightly different images to the left and right eyes, enabling depth perception. The fundamental requirements for 3D vision are two eyes viewing from different perspectives and a brain that can integrate the two views into a 3D image. Different types of 3D technology are described, including anaglyph, polarized, active shutter, and parallax barrier methods. The advantages and disadvantages of each approach are also reviewed.

1. 3D TV
By:
Zohre Ahmadi
Fahimeh Masoumi

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3. HOW DOES 3D WORK ?
 3D TV and cinema tech.
providing slightly different
images to the left and right eyes
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4. WHAT ENABLES US TO SEE IN 3D
WHEN WE HAVE BOTH OUR EYES
OPEN?
 each of our eyes gets to see things from a slightly different
angle
enable our brains to create the sense of distance, or depth
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5. T H E F U N DA M E N TA L
REQUIREMENTS FOR 3D ARE:
 Two working eyes!
 each viewing the world from a slightly different perspective (a
couple of inches apart).
 A brain!!!
 that can take the two views and piece them together into one 3D
view.
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7. W H Y D O E S N ' T T H E WO R L D S E E M
2 D W H E N YO U C L O S E O N E E Y E ?
 Comparing the images of the 2 eyes is only one of several
methods the brain uses to process depth perception.
 your accuracy suffers, but you still have depth perception.
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8.  It does go 2D - you're just remembering the 3D image from
before you closed the other eye because:
The brain also has a remarkable ability to remember what it saw
recently, and apply the same processing to what it has just
seen, even if only through 1 eye.
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9.  I misjudge where the pans go on the stove, flys seem like birds
sometimes, and yep faster. Too many things to mention. If somebody
is handing me something, invariably I misjudge and miss it the first
time.
Just ask me, if you wonder about anything.
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10. RECREATING THE 3D
E F F E C T A RT I F I C I A L LY
 create the ILLUSION of 3D
 The key : feeding a separate image to each eye, but:
this doesn't work with any
two separate images
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11. They must be carefully created
and arranged so that they
represent what each eye
would see if it were looking at
a real 3D scene.
So, when the brain combines the
two separate images (one from
each eye), it is tricked into
thinking that it actually is looking
at a real 3D scene.
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12. MAGIC EYE PICTURES OR
AUTO STEREOGRAMS
Do you remember the
3D "Magic Eye"
pictures or "auto
stereograms" that
were cool in the 90s?
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14. The trouble :
 You can't just overlay two detailed photographs onto a sheet of
paper and expect each eye to be able to focus on just one of
them, not without fancy glasses or other such trickery.
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15. The theory of 3D television :
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16. DIFFERENT TYPES OF 3D TECH.
 anaglyph 3D technology (pretty rubbish)
 polarized 3D technology (used in cinemas)
 active 3D technology (the one most commonly used for home
3D)
 parallax-barrier 3D technology (maybe the 3D technology of
the future).
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17. ANAGLYPH 3D TECH.
 red & blue glasses
 images are colored differently
 Works on standard colour TVs
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18. DISADVANTAGES:
 The images don't have full color
 things tend to look a bit fuzzy
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19. POLARIZATION OF LIGHT
 Light waves are produced by vibrating electric charges.
 Transverse (only transverse waves can be polarized.)
 Polarized Light:
 light in which individual light waves are aligned parallel
to one another.
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20. POLARIZED(PASSIVE) 3D
TECH.
each image is polarized in a different direction
polarized glasses : lenses are polarized in opposite directions
The polarized lens covering your left eye polarized to block the right
image, and vice versa.
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21. 2 TYPES OF
POLARIZATION
 linear
Head tilting may give you a headache
it noticeably affects the light levels
coming from the screen.
 Circular
allowing to tilt your head a bit more
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22.  It works well
 Glasses are cheap & light
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23.  Showing two images with different polarizations:
a little tricky on a flat-screen TV
BUT: not any projector either
using projectors
3D-capable projector
(uses polarizing tech. ≠ active-shutter tech.)
 polarizing projector
also need a special “silver
screen” (an Al coated surface that reflects light in a way that
preserves its polarization.)
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24.  However ... LG released a 47" passive 3D LCD screen - the LD950.
 works by assigning half the lines of pixels on the screen to the left
image, and half to the right.
effectively halve the resolution when it's
running in 3D mode, from HD to standard definition
 but cheap, light glasses
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27. ACTIVE 3D TECHNOLOGY
(MAINSTREAM FOR HOME 3D TV)
 The screen switches rapidly between showing the imageat least
intended
100 times
for the left eye and the image intended for the right eye.
per
second
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28.  But:
 This wouldn't do anything useful without a way to ensure that the
active
shutter
images intended for the left eye only reached the left eye, and the
glasses
images intended for the right eye only reached the right eye
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29. SHUTTER GLASSES
 Lenses can turn from opaque to transparent and back again in
an instant.
 Shutter glasses use liquid crystal tech.
 Can be made transparent or opaque efficiently and silently!!!
 Expensive
 Bulky
 Require batteries or recharging to run
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30. PA R A L L A X B A R R I E R T E C H . - 3 D
WITHOUT GLASSES
 handheld gaming systems
The beauty: don't need glasses
The problem: you have to look at the screen from exactly the right
position (specific position)…
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31.  requires a barrier in front of a screen. The screen shows both the left
and the right images, and the barrier effectively has slits in it that separate
them out.
 Due to pixel division, increase pixel-density: improves 3D image
resolution
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32.  SHARP: They use something called "switching screen" to
implement the parallax barrier, enables their screens to be switched
between 3D and 2D. The switching screen: second LCD screen
placed in front of a regular LCD screen.
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34.  For example, a 21 inch parallax display from Toshiba allows up to a 30
degree horizontal viewing angle, using a "multi-parallax" method to
increase the potential viewing angle.
 The system is actually showing 9 separate pairs of images across the
30 degree angle - the idea being that you'll hopefully be sitting in the right
place for at least one pair of images (one for your left eye, one for your
right).
 It does, however, appear to be a long way from becoming
commercially available……. .
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35. WHICH 3D TECH. TO
CHOOSE?
 Passive technology (polarized) OR active technology (shutter
glasses).
Passive 3D Versus Active 3D
Which Technology is Best?
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36. Passive 3D (polarized)
With a flat-screen TV?
With a projector?
Glasses options
Glasses costs
Can you tilt your head?
Active 3D
It's not the mainstream option that flatscreen-TV manufacturers are pursuing,
but you can get a passive 3D-capable
TV such as the LG LD390 3D-capable
passive LCD TV.
Definitely yes!!!
Yes, a special 3D-capable polarizing
projector and a special silver screen
Yes. Most 3D projectors seem to be
using active 3D technology. It needs a
3D-capable projector though.
3D polarized glasses.
shutter glasses
Cheap
Pretty expensive
linear: not really;
Circular: you can tilt it a fair bit. But
you'll lose the 3D effect if you tilt your
head too much.
You can tilt it a fair bit, but you'll lose
the 3D effect if you tilt your head too
much
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37. REFERENCES:
 http://www.youtube.com/
 http://en.wikipedia.org/
 http://www.displaymate.com/
 http://www.3dtvtechnology.org.uk/
 http://www.physicsclassroom.com/
 http://www.3d-display-info.com/
 http://altadefinizione.hdblog.it/
 http://www.enzim.hu/
 http://www.photophysics.com/
 http://forums.digitalspy.co.uk/
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39. THE END…
thanks for your time and…