How are 3D movies made?

There are many forms of making 3D movies, among which polarized glasses method is widely used.

It uses human eyes to observe the scenery, uses two parallel movie cameras to represent people's left and right eyes respectively, and shoots two movie pictures with tiny horizontal parallax at the same time. During screening, two films are respectively loaded into the left and right film projectors, and two polarizers with polarization axes of 90 degrees are respectively installed in front of the projection lens.

The two projectors need to run synchronously and project the picture onto the metal screen at the same time to form a double image of the left image and the right image. When the audience wears special polarized glasses, the polarization axes of the left and right polarizers are perpendicular to each other and consistent with those in front of the projection lens;

The viewer's left eye can only see the left image, and the right eye can only see the right image. The left and right images are superimposed on the retina through binocular convergence function, and the brain nerve produces stereoscopic vision effect. Show a coherent three-dimensional picture, let the audience feel that the scenery is coming, or enter the deep recess of the picture, which can produce a strong sense of "being there".

Extended data:

Not suitable for people watching 3D movies.

1, monocular and binocular corrected vision difference is more than 3 lines, strabismus, angle-closure glaucoma patients and high-risk groups, patients in the recovery period of ophthalmic surgery. Experts remind patients who have undergone laser myopia surgery not to watch 3d movies often during the recovery period, and it is best not to watch 3d movies within 3 weeks.

2. Hypertension, heart disease, dizziness, acrophobia, depression or mania. The content of 3D movies is mostly flying, spinning, fast switching and ups and downs, which is easy to cause mental stress and psychological discomfort to viewers who usually have fear of heights and carsickness. In addition, the music and pictures of 3D movies are more exciting, and you will feel happier after reading them. Patients with cardiovascular diseases may have symptoms such as high blood pressure, dizziness and chest tightness.

3. Patients with high myopia and hyperopia, the elderly, people with a family history of angle-closure glaucoma, and the audience with shallow anterior chamber and narrow angle are all high-risk groups of glaucoma, so it is not appropriate to watch 3D movies.

Long-term exposure of the eyes to dark environment and dilated pupils will cause peripheral iris to accumulate, narrow the angle of the chamber, affect the circulation of aqueous humor, lead to an increase in intraocular pressure and induce angle-closure glaucoma. In addition, the thrilling scenes in the movie screen can excite the autonomic nervous system of human body, and also dilate the pupils, causing glaucoma attacks.

Baidu Encyclopedia -3D Movie