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3D VISION


 

   We are living in the three dimensional world (length, breadth, and depth).  Our two eyes facilitate to view everything in three dimension.  Our eyes are separated by a small distance.  Hence the two eyes see slightly different views of the same scene.  Consequently two different images falls on the screen of the eyes.  The brain process the two images and gives the three dimensional effect.

      The digital camera takes a photo with only one lens.  So we get only two dimensional flat image and the depth is lacking.  How to produce 3D image?

      Keep two cameras seperated by the distance same as our eyes.  Take two pictures of the same scene. Give greenish colour to one image and reddish colour to the other.  (software tools are available).  Print the two images one above the other or display overlapped images of both on a computer screen.

      Wear colour filter glasses on your eyes.  That is, one eye should receive only red image and the other only green image.  Now look at the superimposed images.  The scene will come alive in 3D.

      In 3D movie, two differently polarized images are projected on the screen. (refer: polarization).  The movie is viewed using polaroid spectacles.  The two images will properly go into two eyes. Now, you will feel as if you are part of the scene.

     Now we have "hologram", it is produced using laser light and interference technique.

     Holograms are found everywhere. in ID cards, driving license, to make them genuine.  Look at a good hologram (naked eyes) and move your head from left to right, you will see the object in the image in various angle as if you are looking at a real object.  This does not happen in colour separated  images or in 3D movie.

      The 3D concept is used in modern virtual reality and 3D devices.  Here two images in the mobile phones are used.  3D movie clips are available in the "you tube".

     Today, 3D movies are common, we  enjoy them with our two eyes.  Similarly two ears facilitate the stereo music.  

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