Posted by:
gallerymotion
Of course there will be some who already know the answer to this, but there are others who are aweinspred by REAL 3D. The days of the horrid red and green filters are over and here comes the age of a clearer 3d experience.
So how does 3D work? It is all about sending a different image in each eye. With one eye red and one eye green, the image that goes in one eye has one of the colours filtered out while the other eye has the other colour filtered out. This means that each eye receives a different image and perceives what it sees in 3 dimensions.
However, each image has to be slightly different in order for 3D perception to come into play, primarily shot in two different angles whose distance is determined by the distance between the eyes. When those images are sent to different eyes, the brain views the seperate image as one by putting them together.
This is best represented with a stereogram picture. Below are 2 images of a daffodil side by side. Each image has been taken from a slightly different angle but there are no filters to automatically trick your brain into viewing both images as one so this requires some manual interference. Cross your eyes until both images start to move together until they form one image:
If you succeeded with this, you will see a 3D daffodil. By refocusing your eyes you are merging the two images together so that your brain views them as one.
So that is how 3D works, but what about REAL 3D where there are no coloured filters to distract you from the image you are seeing? Well, there are indeed two types of filters in the glasses, one in each lens. Instead of filtering out lights of different colours, they filter out lights of different polarisations using polarising films. The film shows two images, one which emits vertical lightwaves and one that emits horizontal lightwaves. Below is an image of the polarisation filters at work:
The small slits in the filters are large enough to only let through waves, meaning that once turned by 90 degrees there is no way that light of a corresponding wavelength can enter the eye. Try this: if you have a pair of REAL D glasses, get two monitors and put them side by side, placing one horizontally. Split the daffodils in 2 and change the aspect of the image so it is flipped horizontally. Put the horizontal image on the horizontal monitor and the vertical image on the vertical monitor and put on your 3D glasses. Because each image is taken from a different angle and computer monitors refresh horizontally, each eye will only see one image and your brain will put them together, recreating the effect of real 3D.
Tags: Real, D, 3D, Glasses, Polarise, Polarised, How it...