What is the principle of using eyes for stereoscopic movies?

Stereoscopic film is the principle of producing stereoscopic effect by using the difference of visual angle and convergence function of eyes. People look at the same object with their left and right eyes, and the images formed on the retina are not exactly the same.

After the two images are synthesized by the brain, they can distinguish the front and back, the distance and the distance of the object, thus producing stereoscopic vision. The principle of stereoscopic film is that two cameras imitate the visual angle of human eyes and shoot at the same time, and two projectors project onto the same screen at the same time for left and right eyes to watch, thus producing stereoscopic effect.

Brief introduction of other situations of stereoscopic film.

When showing a three-dimensional movie, two projectors are placed in a certain way, and two pictures are projected on the same screen point-to-point in a completely consistent and synchronous way. A polarizer should be added in front of the lens of each projector, one is a horizontal polarizer and the other is a vertical polarizer (or diagonally crossed), so that the screen will reflect different polarized light into the eyes of the audience.

Viewers should also wear polarizers when watching movies, and the polarization direction of the left and right lenses must match the projector, so that the left and right eyes can filter out the unpolarized images and only see the corresponding polarized images, that is, the left eye can only see the images projected by the left machine and the right eye can only see the images projected by the right machine. After these pictures are synthesized by the brain, stereoscopic vision is produced.