A rarity, a curiosity… that was the cinema in 3D in the past. But at the moment it seems that the industry of the entertainment begins to bet for him.
More and more he/she prepares in the homes of systems of reproduction of great quality: screens of big dimensions, systems of digital reproduction of video, encircling sound and other marvels that allow to enjoy the cinema at home. So it is logical that I/we are offered something different to be able to visionar in the commercial rooms.
There are different systems to offer cinema in 3D that have left perfecting with the step of the time, but all they are based on the same principle: the vision estereoscópica.
And what is the vision estereoscópica?
Our eyes are as photographic cameras that obtain plane images, of two dimensions. Due to the separation that exists eyes between both, this binocular vision gets two images that are lightly different, and that difference varies in function from the distance to which you/they are the different objects that fall in our field of vision.
Our brain is the one in charge of interpreting those plane images in way queconstruye the tridimensionalidad to which we are accustomed.
So the different systems of three-dimensional cinema try to reproduce the form in that our eyes register images of the real world, so that we perceive the imágen projected in a plane screen as if it was not two-dimensional.
A lot of time has passed from the first intents, those based on the color, in those that the spectator used some special glasses that you/they covered the eyes with a semi-transparent cellophane of red color on an eye and of blue color on the other one. Each eye perceived this way a different imágen, according to the color portion that each one of the cellophanes let pass without filtering. The result was an acceptable tridimensionalidad sensation.
Later on they began to be projected the images in real color (not the red-green of the previous method) and to be used glasses of polarized glasses, in such a way that the glass of an eye allowed to see the image emitted in a polarized light and the other one the image emitted in another polarized light.
At the moment the movie is in fact two movies projected at the same time with the inserted frames and the glasses they have a filter LCD that is synchronized with the projection system, so that the glasses are darkened alternatingly so that an eye watches a movie and the other one sees the other one and that the slight differences among both conform the three-dimensional image, in the same way that the brain forms the three-dimensional image starting from the real world.
If the projection frequency is sufficiently high, twinklings of any class and the sensation 3D are not detected it is very convincing.
: So that an alive being can enjoy three-dimensional vision, it is indispensable that it has two eyes located in the front of his skull. It is an indispensable evolutionary adaptation to calculate the distances correctly.
He/she notices sabionda: And the following step seems that it will be the holographic cinema, still in development that consists from a screen made up of multitude of small units to those that can be changed its transparency, shine and color. When impacting the light on those elements in different state, it is gotten that the light reflected in the screen forms the wanted image. If the changes are carried out with the enough speed the movement sensation it is achieved
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