3 d display technique

3D DISPLAY TECHNIQUE

PRESENTED BY-A. PRIYAMSc- ITSEM-II

Pt. RSU, Raipur13D DISPLAY TECHNIQUE

3D DISPLAY TECHNIQUE 2

INDEX O V E R V I E W W h a t i s 3 D ? P r i n c i p l e o f 3 D d i s p l a y . S t e r e o s c o p y

P r o b l e m s a n d t h e i r s o l u t i o n . A u t o - s t e r e o s c o p y .

A p p l i c a t i o n s .

O B S T A C L E S

• ANAGLYPH• POLARIZATION• ECLIPSE METHOD

• GUIDED LIGHT• LENTICULAR SCREEN• PARALLAX BARRIER


WHAT IS 3D? Stereoscopy (also

called stereoscopics or 3D imaging) is a technique for creating or enhancing the illusion of depth in an image by means of stereopsis for binocular vision.

http://en.wikipedia.org/wiki/Depth_perception

http://en.wikipedia.org/wiki/Stereopsis

http://en.wikipedia.org/wiki/Binocular_vision


OVERVIEW HUMAN VISION & PERCEPTION OF 3D WORLD

Human eyes are equipped with an absolutely amazing binocular vision system. For objects up to about 20 feet (6 to 7 meters) away, the binocular vision system lets us easily tell with good accuracy how far away an object is.

The binocular vision system relies on the fact that our two eyes are spaced about 2 inches (5 centimeters) apart. Therefore, each eye sees the world from a slightly different perspective, and the binocular vision system in our brain uses the difference to calculate distance. Our brain has the ability to correlate the images it sees in its two eyes even though they are slightly different.


BINOCULAR VISION SYSTEM


PRINCIPLE OF 3D DISPLAY

Main concept behind 3D display is to generate a sense of variation in depth. To achieve this, two perspective of a single image, each for one eye, is used. The principle is to send an individual image to each eye. our eyes can correlate these images automatically because each eye sees only one of the images.


DISPLAY TECHNIQUES

WITH GLASSES

WITHOUT GLASSES


3D TECHNIQUE WITH GLASSES

ANAGLYPH

In this system, two images are displayed on the screen, one in red and the other in blue (or cyan or green). The filters on the glasses allow only one image to enter each eye, and our brain does the rest.


DRAWBACK: We cannot have a color movie when we are using color to provide the separation, so the image quality is not nearly as good as with the polarized system.

ANAGLYPH



POLARIZATION To present stereoscopic images and

films, two images are projected superimposed onto the same screen or display through different polarizing filters. The glasses allow only one of the images into each eye because they contain lenses with different polarization.

DRAWBACK: It's very difficult to use the polarization technique for home theater systems -- most methods would require to coat our television screen with a special polarizing film first.

http://en.wikipedia.org/wiki/Polarizing_filter



ECLIPSE METHOD: An Eclipse compatible projector can display

full-color 3D images on any white screen or surface. This format uses four primary colors to superimpose the left and right eye images.

When one eye views the full-color image and the other eye views the monochrome image, the mind perceives a full-color image (not half-color). The color comes from the full-color image. The depth comes from the monochrome image.


ECLIPSE METHOD: (Active Shutter System)

With the eclipse method, a shutter blocks light from each appropriate eye when the converse eye's image is projected on the screen. The projector alternates between left and right images, and opens and closes the shutters in the glasses or viewer in synchronization with the images on the screen.


3D TECHNIQUES WITH GLASSES

ACTIVE SHUTTER CAPTURING

ACTIVE SHUTTER SCREENING


PROBLEMSThe most common 3D displays require users to wear special glasses, which has limited the technology’s popularity. Now researcher and vendors are working on glasses-free 3D displays.


SOLUTION Using auto stereoscopic displays to

generate 3D images without glasses.

Autostereoscopy is a method of displaying stereoscopic images (adding binocular perception of 3D depth) without the use of special headgear or glasses.

Because headgear is not required, it is also called "glasses-free 3D" or "glasses less 3D".

http://en.wikipedia.org/wiki/Stereoscopy

http://en.wikipedia.org/wiki/Binocular_vision


AUTO STEREIOSCOPIC DISPLAY

There are two broad classes of auto stereoscopic displays:

1. Eye tracking (the process of measuring either the point of gaze - where one is looking or the motion of an eye relative to the head.)

2. Multi view ( A multi view display uses optics to render two or more views of a scene, which the user’s optical system fuses into single 3D image

3. .)

http://en.wikipedia.org/wiki/Gaze_(physiology)


3D TECHNIQUES WITHOUT GLASSES

Guided light:

This techniques use special holographic prisms that organize multiple high end projectors output into a single 3D image.



Lenticular sheet

This method relies on a display coated with a lenticular film. Lenticuler 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 our eyes -- each eye sees only one image. Our brain puts the images together and interpret it as a three-dimensional image.


LENTICULAR LENSES



Parallax barrier: A parallax barrier is a device

placed in front of an image source, such as a liquid crystal display, to allow it to show a stereoscopic image without 3D glasses. Placed in front of the normal LCD, it consists of a layer of material with a series of precision slits, allowing each eye to see a different set of pixels, so creating a sense of depth through parallax in an effect similar to what lenticular printing produces for printed products.


PARALLAX BARRIER


OBSTACLES Because they entail complex projection and

display technologies, auto stereoscopic system cost substantially more than traditional 3D displays.

To render multiple viewing angles for a group of users, lenticular and barrier techniques lose resolution.

Moreover they offer a limited number of viewing angles from which users can see 3D images.


3D GADGETS AND APPLICATIONS 3D MOVIES CLASSIC

ANAGLYPH TECHNIQUE

POLARISATION TECHNIQUE


3D GADGETS AND APPLICATIONS

3D CAMERA

ACTIVE SHUTTER CAPTURING



3D GAMING

ACTIVE SHUTTER

GLASS



3D TV AUTO-STEREOSCOPY

ACTIVE SHUTTER GLASS


IS 3D TECHNOLOGY REALLY THE FUTURE?

With the constant development of 3D technology and the new inventions of our technological age the 3D glasses as we know them will soon become a thing of the past. So whether you are a fan of 3D or not you simply can't deny that 3D without glasses is the future of 3D vision. When it becomes a common practice and employed in the most devices all the last doubts will fall away.


THANKYOU !

3 d display technique

Engineering