Normally what we see on TV, cell-phone displays, movie theatre is
simply 2D, but the improvement in technology has allowed us to gain a 3D
experience.
But has anyone noted or even thought that there is a lot of
difference in watching a 3D movie in a theatre, 3D on our home screen and 3D in
our smartphones.
In real life when we view an object either eye sees a different
picture from other due to a minute variation in the angle. The difference in
angle will be as greater as you are close to the target object. Our brain
calculates this information and creates a single image having depth, which
helps us to calculate the distance of the target object.
Therefore 3D film makers take shot from two different angles
corresponding to average distance between human eyes that is two different
cameras are used. In animated films these shots come from computer models.
Various 3D Techniques are explained here
At movie theater
Earlier, the 3D effect was
created by using different colors for different eyes. Ever noticed the earlier
3D glasses blue for left and red for right eye respectively was used. This is
also known as red cyan anaglyph 3D movies.
Currently we use polarization
technique. In this the 3D projector uses polarized filters light is polarized
and two images are projected- a right eye perspective displayed by clockwise
polarization and a left eye perspective displayed by anticlockwise
polarization. The audience has to wear special polarized glasses as that allow
the right polarity to enter each eye. The brain assembles both the images
having depth.
If polarization is linear
then audience have to sit in front of the screen with their faces aligned to
the screen and if polarization is circular audience are free to sit in any
position
3D IN HOME
Well 3D at home is of two types i.e. active and passive.
Active
3D:-
3D enabled LCD plasma TV sets work differently from technology
used in cinema halls. Here the glasses worn by the viewer are not polarized but
active shutter glasses. In this technology the TV rapidly flashes alternating
left-eye and right-eye video frames. in this at a particular instant of time
only a single perspective is active i.e. when screen flashes left perspective
the right eye of glasses turns opaque and when it flashes right eye
perspective, left eye of glasses turns opaque. And all this happens at a great
speed at 120 Hz or 120 times per second. The only con is that you have to still
wear glasses.
Passive
3D:-
Here the TV divides left and right eye perspectives into
alternating vertical columns. The screen has numerous microscopic lenses placed
on it to bend the light rays such that each right perspective reaches right eye
and left eye perspective reaches left eye. The amazing thing is that in this
technology there is no need to wear glasses.
3D in smartphones
The technique used in
smartphones to display 3D is AUTOSTEREOSCOPY. Many phones such as LG Optimus 3D
and HTC EVO 3D use this technique. The 3D which we have dealt with earlier or
traditional 3D is stereoscopic 3D that is we require glasses in them but
auto-stereoscopic 3D is glass free 3D. In this technique instead of different
images different light to the two eyes. Techniques such as parallax barrier or
lenticular technique is used here.
The future of 3D
The future of 3D is seen
very bright. Scientists and researchers are testing 3D technology in such a way
that devices could be manufatured that show different images or videos to
different viewers looking at the same screen. For instance in passive 3D TV
every person watches the TV sitting at a different angle and thus a different
image is seen by him, so every person in the family is able to watch his/ her
favorite channels at the same time without fighting over the remote.
Another application of 3D
in future could be 3D conferencing which will be a next step from video
conferencing with 3D video conferencing eye contact gets possible, which is a
more lively way to communicate.
3D processing hardware
such as high end laptops and 3D gaming devices are already available in the
market. NVidia and AMD are already using this technology to produce high end
graphic cards for gaming devices.
Smartphones will also
support 3D recording images and videos through two cameras placed at some
distance apart. The different angles of cameras w.r.t. object being
photographed.
Not only this much 3D will
rule the world in the coming future
Subscribe Author for Updates
No comments :
Post a Comment