Technocrats Institute Of Technology[Excellence]

PRESENTATION BY:

VISHAL DESHMUKH

VIPUL POPHALE

Technology

ACKNOWLEDGEMENT

We would like to express our special thanks of gratitude to our HOD Ma’am Mrs. Hema Singh and to our TG Mr. Gaurav Mittal for giving us the golden opportunity to do this wonderful project on the topic-

“3D Technology

which also helped us in doing a lot of Research and we came to know about so many new things.

Introduction History How we see 3DHow to create 3D ? Common 3D display technique Viewing through glass Anaglyphic 3D Polarization 3DActive glassesAuto stereoscopic display Lenticular lenses Parallax barrier

Architecture of 3D TV Transmission3D displayApplication

Advantages and disadvantage

Contents

A 3D television is a television that employs techniques of 3D presentation, such as stereoscopic capture, multi-view capture, or 2D plus depth, and a 3D display a special viewing device to project a television program into a realistic three-dimensional field.

Three dimensional TV is expected to be next revolution in the TV history.

Introduction

The stereoscope was first invented by Sir Charles Wheatstone in 1838.

Stereoscopic 3D television was demonstrated for the first time on 10 August 1928.

A stereoscope is a device for viewing a stereoscopic pair of separate images, depicting left-eye and right-eye views of the same scene, as a single three-dimensional image.

History

Basic principle tricking our dumb, binocular brain into interpreting a 2Dimage into one with depth.

A key part of this process is binocular disparity. It means each eye has a slightly different viewpoint.

How we see 3D

When an object is far away, the light traveling to one eye is parallel with the light traveling to the other eye. But as an object gets closer, the lines are no longer parallel --they converge and our eyes shift to compensate.

It involves the usage of two cameras (or a camera having two lenses), placed side by side with the center of their lenses spaced approximately and ideally, the same distance as the space between our eyes.

How to create 3D?

Both cameras record in sync and the resulting left and right eye videos or images are then edited and presented to the viewer (in cinemas) via different techniques.

Projecting stereoscopic image pairs to the viewer include:

Passive glass:

Anaglyphic 3D (with red-blue glasses)

Polarization 3D (with polarized glasses)

Active glass: Alternate-frame sequencingAuto stereoscopic displays (without glasses)

Common 3D display technology

Two sets of images are meant to be seen by only particular eye.

Hence each eye can only see one set of images, your brain interprets this to mean that both eyes are looking at the same object.

That's what creates the illusion of depth.

Viewing through glasses

There are two sets of images slightly offset from one another. One will have a blue tint to it and the other will have a reddish hue.

Anaglyph glasses use two different color lenses to filter the images you look at on the television screen.

The two most common colors used are red and blue.

Anaglyphic 3DRed-Blue glasses

Light waves of two images are projected at certain angles.Each lens only allows light to pass through that is polarized in

a compatible way. It is more popular than anaglyph glasses because the

polarization don't distort the color of the image.Hence it is popular in projector based display.

Polarization 3DPolarized glasses

An active glasses system alternates between the two sets of images at very high speeds.

Active glasses have infrared (IR)sensors.

As the 3-D content appears on the screen, the picture alternates between two sets of the same image.

Active glassesAlternate-frame sequencing

It's easier to present 3-D in HD content using active glasses than with passive glasses.

That's because with a passive glass system, the television has to display two sets of images at the same time.

An active glasses system alternates between that two sets of images at very high speeds--it's less information for the television to handle at any particular moment.

Advantage of active glasses over passive glasses

Stereoscopic method leads to problems: The glasses are really cumbersome

and expensive, and you don't want to accidentally sit on one or lose it. And what to do when we don't have enough lenses.

Plus, it takes away the simplicity of television as it stands today, where you simply hit the remote and start watching.

Also, without the glasses, any 3D content is completely unusable.

But still have a problem

with those glasses?

Two main technologies that rely on it:

Lenticular lenses Parallax barrier

Auto stereoscopic display

Basically A lenticular lens is an array of magnifying or directing lenses, designed so that when viewed from slightly different angles, different images are magnified.

Lenticulars are tiny lenses on the base side of a special film.

The screen displays two sets of the same image. The lenses direct the light from the images to your eyes each eye sees only one image.

Lenticular lenses

On a 3D screen, a very fine grating, called a "parallax barrier", is placed in front of the LCD screen.

The parallax barrier is a fine grating of liquid crystals placed in front of the screen, with slits in it that correspond to certain columns of pixels of the screen.

It does the job of the polarizing glasses, directing light from each image slightly in different direction so that at a so-called "sweet spot" about 30 inches in front of the screen the two images are separated just enough that the brain will create a composite 3D image.

Parallax barrier

Parallax barrier can be switched on and off with ease (one button on the remote is all it would take), allowing the TV to be used for 2D or3D viewing. So on a computer monitor, you could play video games in full 3D and then easily switch to 2D mode for your work requirements.

Advantage of parallax barrier over lenticular lenses

Architecture of 3D TV

Transmission

Gigabit EthernetA transmission technology, enables super net to

deliver enhanced network performance.

video games TV applications for physicists, scientists, and engineers

could also be extremely useful. Richer ,Lifelike and entertaining experience than

2D TV for home users.Future use in mobile.

Application of 3D TV

ADVANTAGES AND DISADVANTAGES

Thus we have seen various technologies used for 3D imaging and viewing.

We also explained technology of 3D TV, discussed various aspects and features of 3D TV.

  Another area of future research is precise colour reproduction of natural scenes on multiview displays.

In future we will be able to touch and smell the objects being projected from a screen to the viewers.

Conclusion