Science and Technological Issues
3D Glasses
Q. Why do we use only red, blue and green colours in 3D glasses?
Answer: Presence of any object or image on a screen is
perceived by the brain from the light reflected by it and received by the eye as
stimuli in the human visual (neural) system. The human visual system basically
splits the reflected light in to three components corresponding to blue, green
and red regions of the visible spectrum. Also it is possible to produce any
colour just by mixing/ controlling the relative intensities of these three
colors. Hence these three colours are called primary colours and are quantified
in terms of tri-stimulus values.
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In order to generate an illusion or impression of real space
(both area and depth) of an object or image in a two dimensional projection,
three dimensional (3D) glasses are used which is accomplished with the principle
of binocular vision. That is the two eyes of the human visual system placed
apart ( about 5 cms ) perceive the object/image from different positions and
angles in turn causing response or stimuli as two different images of the same
object in the neural- visual system of the brain. Binocular vision in our brain
uses the difference to calculate distance/depth and has the ability to correlate
the images it sees in its two eyes even though they are slightly different. In
the binocular system, the same scene is projected simultaneously from two
different angles in two different colors usually red and cyan (or blue or
green). In order to see things in 3D each eye must see a slightly different
picture.
The brain then puts the two pictures together to formone 3D
image that has depth eventually generating a three dimensional impression. 3D
glassesmake use any two of these primary colors ( blue, green and red) one for
each eye as the intensity of the third colour can be inferred from difference
between total light and the sum of intensities of these two colours to get the
complete information on colour of the object or image to be seen through the 3D
glass.
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