What is the principle of cinema 3D movies?

3D movies are three-dimensional movies, and the principle is:

Two cameras, such as human eyes, are used to take two-view images 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 emitted by the projector passes through the polarizer and becomes polarized light. The polarization directions of the polarizers in front of the left projector and the right projector are perpendicular to each other, so the polarization directions of the two polarized lights are also perpendicular to each other. These two beams of polarized light are projected on the screen and then reflected to the audience, and the polarization direction remains unchanged.

The audience uses polarized glasses corresponding to polarized light, 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 the stereoscopic scene. This is the principle of stereoscopic movies.

Extended data:

1 and 1839, British scientist Sir Charlie Whiston invented a kind of stereoscopic glasses according to the phenomenon that "the images of two people's eyes are different", so that people's left eye and right eye can have different effects when watching the same image, which is the principle of 3D glasses today.

2. The earliest stereoscopic 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