The principle of 3D movies?

Two cameras, such as human eyes, are used to take a double-view image of the scene. Then through two projectors, the images of two viewpoints are projected synchronously, so that two slightly different images are displayed on the screen. At this time, if you look at it directly with your eyes, the pictures you see are overlapping and somewhat blurred. In order to see stereoscopic images, measures must be taken to make the left eye only see the left image and the right eye only see the right image.

The light from the projector becomes polarized light after passing through the polarizer, and the polarization directions of the polarizers in front of the left and right projectors are perpendicular to each other, so the polarization directions of the two polarized lights are also perpendicular to each other. Viewers use polarized glasses corresponding to the polarized light to watch, that is, the left eye can only see the picture reflected by the left machine and the right eye can only see the picture reflected by the right machine, thus seeing a three-dimensional scene, which is the principle of three-dimensional movies.

Extended data:

1, the first three-dimensional movie appeared in 1922. When showing this film, two pictures are superimposed on the screen. Through the audience's special glasses or the radial semi-conical lens grating in front of the screen, the audience's left eye can see the picture taken from the left perspective, and the right eye can see the picture taken from the right perspective, and the stereoscopic image is synthesized through the convergence function of both eyes.

3. Three-dimensional film photos can be applied to artistic portrait photography, personalized wedding photography, fashion children photography, pet baby photography, commercial product photography, interior decoration photography, three-dimensional display of architectural sculpture, tourism landscape photography and so on.

References:

Baidu Encyclopedia -3D Movie