How does a 3D technology work? Simple Understanding About 3D Tech. 2017

Polarized glasses for 3D movies

Touchable 3D technology

Touchable 3D technology

The concept of 3D technology has been there in the world when sci-fi movies and TV shows implemented the idea of holograms making it a reality but it all started when Sir Charles Wheatstone invented the stereoscope i.e., a device for viewing 3-dimensional images after that 3D technology has been evolving ever since. Scientist and Engineers are coming with ways to make gadgets that display 3D videos and images


Pocket Stereoscope

Pocket Stereoscope Image

Stereoscope work on the principle of parallax i.e., our one eye see an object slightly different angle than the other e.g., human eyes are approximately 50mm to 75mm apart due to parallax we see a different view from each eye and our brain takes the images and merges them together using some high powered geometry making us see the 3D object in real time. Stereoscope are glasses that take advantage of this effect and let us experience movies in 3D but the problem in making these movies is that camera does not work like human eye i.e. our brain can figure out difference between images from two angles but camera cannot, so engineers use either anaglyph or polarized glasses to do that.

Anaglyph Image

Anaglyph Image 2017

In anaglyph glasses, we use two different color filters one for each eye. It begin with using red and blue color glasses but later, engineers started using other colors to project motion pictures it works same as parallax method but only difference is that one eye receives color red and another eye blue and our brain puts them together to make us see the 3D effect in movies. One of the drawbacks of using such glasses is that for full range of colors it gives course color reproduction or ghosting effect.

In polarized glasses, we use polarizing filters that superimpose the light waves to change their orientation e.g., one image is projected in horizontal direction and another image is in vertical direction on the both lenses polarization occurs and it gives us the perception of 3D but the main issue in using this technique is tilting your head disorients the image by messing with colors and 3D effects. To overcome this engineers are now using rotational polarities i.e., superimposing the light in the clockwise direction for one lens and counterclockwise for another.


Polarized glasses for 3D movies

Polarized glasses for 3D movies

To make movies in 3D we have to film two versions of the same scene from different angles precisely as if a person’s eyes are seeing the same scene. Filmmakers need to make cameras coordinate with each other so, that they will focus the same object at a similar speed, zoom and track otherwise images won’t sync together. However, to take close ups cameras need to be extraordinarily close together. They come up with a way to solve it by using mirror rigs. In mirror rigs, they construct cameras together to project a 3D-system in order to film through one lens and the image of it is then reflected by a tiny internal mirror to another camera where a second image can be captured but to do that it has to be dirt free and with no scratches on it. Animation movies are easy to make in 3D but requiring more time and effort.

In the case of games, we use the same technique besides the makers have to work from the perspective of a player by creating every object in 3D from a variety of angles to make it appear real in the virtual world.


3D television

3D television

It is possible to use the same technique to make gadgets like television interactive in 3D implements two ways i.e. active and passive.

For Active Systems, viewers have to wear an electronic glass that are synced with television frames by a shutter that opens and closes in front of their eyes allowing them to see only one screen at a time. These shutters have high refresh rate i.e., actual images on the shutter is quickly loaded and reloaded so fast that you see 3D images.

For Passive Systems, viewers do not have to wear any glasses because television screen uses a thin lenticular screen over a standard display. A lenticular screen is made up of a series of incredibly thin magnifying strips that show the slightly different perspective of the screen to each eye. The Drawback of this system is that it limits the image quality because each eye only sees one-half of the screen at any given time e.g. if a screen had 100 pixels, 50 pixels would be magnified and sent to the left eye and other 50 pixels would be magnified and sent to the right eye.

3D technology is currently advancing but in upcoming years there will be gadgets that do not require any glasses or display that reduces image quality but do not confine in any way making the virtual world appear as real as possible.

About Darshan Rathod

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