Polarized 3D glasses allow viewers to see 3D images by restricting the light that reaches each eye. They work by projecting two slightly different images that are polarized differently. The glasses contain polarized filters for each eye that allow only the corresponding image to pass through to the proper eye. This technique was developed in the 1930s and was widely used for 3D movies in the 1950s. It provides full color 3D images using inexpensive glasses but has limitations such as reduced resolution from sharing the screen between the two images.

1. 3D PC GLASSES
By,
Sravanthi.G
08Q61A0521

2. AGENDA:
 INTRODUCTION
 HISTORY
 WORKING PROCESS
 TECHNOLOGICAL ISSUES
 ADVANTAGES
 DISADVANTAGES
 CONCLUSION
 BIBILOGRAPHY

3. INTRODUCTION:
 Only a few years ago, seeing in 3-D meant peering through a
pair of red-and-blue glasses, or trying not to go cross-eyed in
front of a page of fuzzy dots. It was great at the time, but 3-D
technology has moved on.
 Scientists know more about how our vision works than ever
before, and our computers are more powerful than ever before -
- most of us have sophisticated components in our computer
that are dedicated to producing realistic graphics.
 Most computer users are familiar with 3-D games. Back in the
90s, computer enthusiasts were stunned by the game Castle
Wolfenstein 3D, which took place in a maze-like castle..

4.  Polarized 3D glasses create the illusion of three-dimensional
images by restricting the light that reaches each eye, an
example of stereoscopy which exploits the polarization of
light.
 To present a stereoscopic motion picture, two images are
projected superimposed onto the same screen through
different polarizing filters. The viewer wears low-cost
eyeglasses which contain a pair of different polarizing filters.
 This is used to produce a three-dimensional effect by
projecting the same scene into both eyes, but depicted from
slightly different perspectives. Several people can view the
stereoscopic images at the same time.

5. HISTORY:
 Polarized stereoscopic pictures have been around since 1936,
when Edwin H. Land first applied it to motion pictures. The
so called "3-D movie craze" in the years 1952 through 1955
was almost entirely offered in theaters using polarizing
projection and glasses.
 Only a minute amount of the total 3D films shown in the
period used the anaglyph color filter method. Linear
polarization was also the standard in the 80s.
 In the 2000s, computer animation, digital projection, and the
use of sophisticated IMAX 70mm film projectors, have
created an opportunity for a new wave of polarized 3D films.

6. WORKING PROCESS:
 3D Modes
There are several different methods of sending the separated views
to your monitor for use with your glasses.
 Interlacing
Interlacing is a process where the image on the screen is drawn on
the alternating rows of pixels on your monitor. For instance the left
image would be displayed on the 1, 3, 5, 7, ... row of pixels while
your right eye is covered and then on the 2, 4, 6 , 8, ... rows while
your left eye is covered
 Page Flipping
It displays the left and right image on the screen in sync with the
shutter glasses. Page flipping has higher hardware requirements than
the other modes as in order to achieve a flicker free image you have
to have at least 60 frames per second and with two images to
display, that would mean your monitor must do 120hz refresh rate at
the desired resolution your game is at.

7.  Sync Doubling
Another non-hardware intensive mode Sync Doubling which uses a
sync doubler device between your monitor and video card. The
video card displays the left and right images one above the other in
half the vertical resolution,
.
 Line Blanking
Essentially the same as Sync Doubling, Line blanking instead of
doubling the vertical lines blanks every other one which gives you
the appearance of the old arcade games scan lines where there is an
obvious black line interlaced in the off scan lines.
 Anaglyph
This is probably the mode of 3D presentation you are most
familiar with. These are those nerdy looking paper glasses
with the red and blue lenses. Several different TV programs
have been broadcast in anaglyph format such as Jaws 3D,
The Drew Cary show, and I believe Third Rock also had a
special 3D episode as well.

8. STEPS:
 Find a cheap pair of plastic sunglasses.
 Use the plastic lenses as a template to draw the correct shape onto
the transparency sheet, cellophane, or acetate.

9. 3.Cut out the lenses on the inside edge of the line you have
traced on the plastic.
4.Color with the red and blue markers. If you didn't use red or blue
colored plastic sheeting, you'll need to color each lens. Make the left
lense red, the other blue.

10.  5.Place the colored lenses back into the frames. Red goes on
the LEFT, and blue goes on the RIGHT.
 6.Check that they fit well. Make any adjustments needed. Then start watching
your 3D movie.

11. TECHNOLOGY:
 3D GLASSES have used polarized technology since at least 1938,
when General Motors presented a 3D film at the New York World's
fair, using viewers manufactured by Polaroid .
 Projection is simple, as only two filters (one in front of each of the
projection lenses) are needed.
 Because neutral-gray linear-polarizing filters are easily
manufactured, correct color rendition is possible. (Circular-
polarizing filters often have a slight brownish tint, which has to be
compensated for during projection.)

12.  3D DLP TV
In 2007, Texas Instruments introduced stereo 3D
capable DLP solutions to its OEMs,and Samsung and Mitsubishi
introduced the first 3D ready televisions.
These solutions utilize the inherent speed advantage of the Digital
Micro-mirror Device (DMD) to sequentially generate a high refresh
rate for the left and right views required for stereoscopic imaging.
 3D PDP
Plasma display panels are inherently high-speed devices as
well, since they use pulse-width modulation to maintain the
brightness of individual pixels, making them compatible with
sequential method involving shutter glasses.

13. LCD/LED TV
 Liquid crystal displays have traditionally been slow to change from
one polarization state to another. Users of early 1990s laptops are
familiar with the smearing and blurring that occurs when something
moves too fast for the LCD to keep up. This smearing can result in a
completely unviewable image when using shutter glasses.
 LCD technology is not usually rated by frames per second but rather
the time it takes to transition from darkness to brightness and back to
darkness, in milliseconds. In order to achieve an equivalent
minimum refresh rate of 120 Hz, an LCD must be able to transition
at a speed of not more than 8.33 ms

14. ADVANTAGES:
 Polarized glasses are generally inexpensive.
 Polarized glasses don't require any power.
 Polarized glasses don't require a transmitter to synchronize them
with the display.
 Polarized glasses do not suffer from flicker or ghosting effects.
 Compared to anaglyph images, the use of polarized 3D glasses
produces a full-color image that is considerably more comfortable to
watch and is not subject to binocular rivalry.

15. DISADVANTAGES:
 The images for polarized glasses have to share the screen
simultaneously, and therefore cannot have full resolution delivered
to each eye simultaneously. A full 1080p picture results from image
fusion.
 There are incompatible polarized systems (Circular or linear
polarized.)
 However it produces a full color image but, it requires a
significant increase in expense.

16. CONCLUSION:
 The world is a flat disc - at least for the virtual worlds of computer
games, which will remain confined to 2D on the screens of their
players. 3D stereo displays are (still) too expensive and (still) carry
too many limitations to be of interest to the broader PC market.
 Autostereoscopic displays are a step in the right direction, but their
high price and the need for an extra monitor for 2D use make these
solutions uninteresting for anything but professional applications.
 Another reason preventing their acceptance in the near term is the
associated reduction of image quality brought on by the halving of
the horizontal resolution.

17. BIBILOGRAPHY:
 Make Your own Stereo Pictures Julius B. Kaiser The Macmillan
Company 1955 page 271
 Sony Digital Cinema 3D presentation
 Technicolor 3D
 "3D displays". Individual.utoronto.ca. Retrieved 2009-11-03.
 Manjoo Farhad. A look at Disney and Pixar's 3-D movie
technology. 2008.04.09. Downloaded 2009.06.07
 Price list showing paper linear polarized glasses at 3 for $2,
anaglyph 2 for $1 http://www.berezin.com/3d/3dglasses.htm
 http://www.displaymate.com/3D_TV_ShootOut_1.htm
 http://hdguru.com/wp-content/uploads/2011/03/Intertek-LG-
FPR-Report-.jpg


18. ANY QUERIES
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19. THANK YOU