Why 3D movies look so real

On December 28, 1895, the French Lumière brothers used their invented “moving movie machine” in a cafe in Paris to screen films such as “Train in the Station”, “Demolition of the Wall”, and “Baby’s Lunch” for the first time. . This is the first public screening of a movie in the world.

Today, the film has gone through more than one hundred years of history and has entered the 3D era. The movie is far more realistic than it was more than 100 years ago. How is this done?

Let’s first do a simple experiment: stand up a pen on the table, close your left eye, and use your right eye to look at the position of the pen; then close your right eye, open your left eye, and look at the pen’s position. Location. Doing this alternately for the left and right eyes several times, and found that there is no, the position of this pen seems to be dangling slightly.

Original caption: Children at an IMAX Theater in New York City experience an eight story high film screen in 3 dimensions with the aid of liquid crystal headsets that blink 48 times a second. — Image by ?Louie Psihoyos/Science Faction/Corbis

The visual effects brought by 3D movies are so realistic that people can’t help but reach out and try to touch

For the pen in front of us, there is actually only one position, but our left eye and right eye are a few centimeters apart, so the position they see will be slightly different. In order to avoid a fight between the two eyes, the brain command must “mediate” and combine the things seen by the left and right eyes into a picture. The smart brain not only didn’t make the synthesized picture dangle, but it can also judge how far the pen is from you based on the difference in the position of the left and right eyes. We can easily see the “different distances” of everything in front of us, largely due to this “binocular effect”.

In recent years, the popular IMAX-3D movies, like the well-known American movie “Avatar”, its 3D effect is exactly the use of this “binocular effect.” Ordinary movies provide you with the same content, but 3D movies let your eyes see “different movies” separately. Maybe you would say, I have also worn 3D movie glasses, but I didn’t realize that I saw something different? Of course, the movie picture you see with your left and right eyes is the same, but the position and size of the objects on the movie picture are slightly different. When the brain combines the movie pictures from the two perspectives, it will appear before you. It gives a three-dimensional image that feels like being at the scene and standing next to Avatar. Compared with ordinary movies, 3D movies require at least two cameras to represent the angle of view of the two eyes when shooting. The captured images must be processed by a computer. Finally, these “two movies” are carefully produced and displayed on the screen. .

The lens of 3D movie glasses is made of a material called polarizer

Why is that pair of glasses so magical, so that the left eye and the right eye see different things? The lenses of common 3D movie glasses are neither near-sighted glasses nor far-sighted glasses, but a material called polarizer. The light emitted on the 3D movie screen is also extraordinary, called circularly polarized light. While the light travels forward, it revolves around itself. The light on the screen that is broadcast to the left eye turns counterclockwise. , The light broadcast to the right eye rotates clockwise, while the polarized lens of the left eyeglasses just let the light that rotates counterclockwise pass through, and the polarized lens of the right side only let the light that rotates clockwise through. If the direction of light rotation cannot be recognized by the lens, it will be filtered out, which ensures that the left and right eyes see the images they need to receive and will not be mixed together.

Glasses-free 3D technology allows people to watch 3D movies without wearing 3D glasses

In addition to polarized glasses, there is also a kind of glasses called “shutter glasses”. When wearing this kind of 3D movie glasses, the picture needed by the left eye and the picture needed by the right eye are quickly displayed alternately on the movie screen, with an interval of only a few tenths of a second. The lens of the glasses is also changing. If the screen shows the image required by the left eye, the left mirror is transparent, but the right mirror will be “turned off”, turning black, temporarily blocking the right eye; then the screen When the picture required by the right eye is displayed on the top, the mirror on the right side is transparent, and the left side becomes black, blocking the left eye. In this way, due to the rapid change, you are completely unaware that one eye is blocked every time. In fact, the two eyes are looking at each other in turn, but the composite is the same smooth three-dimensional image.

If you don’t wear 3D movie glasses, can you still watch 3D movies and TV screens? Of course, it depends on naked-eye 3D technology. Since we can put glasses on people’s eyes, why can’t we put glasses on the screen? Of course, there are more naked-eye 3D game consoles and mobile phones, and naked-eye 3D TV sets and movies are not very popular.

The naked-eye 3D technology still has many areas to be improved, but scientists still have a more dazzling technology, that is holographic film. Regardless of whether it uses 3D glasses or glasses-free 3D technology, the disadvantages of the aforementioned movies are that their viewing angles are fixed. No matter how strong the three-dimensional sense of the movie, the film director’s lens shows you the face of Avatar, you can only look at the face of Avatar, and the hand that shows you the Avatar, you can only look at the hand, if you want to go around Avatar’s side Take a look, is it possible? Holographic movies allow you to watch movies from all angles. The movie is no longer a picture, but a virtual object placed in front of you that can be seen from the front, back, left, and right. Its three-dimensional sense will be stronger.

American movie “Avatar” is the first 3D movie

Imagine that in a small room, you can travel around the world without leaving home. Click on the “Sahara Desert” and you will see yellow sand in the sky, the sound of wind whistling around your ears, and the feeling of stepping on the sand at your feet. You seem to be in the desert, and you can’t tell whether it’s a dream or a dream. Reality; click on “New York Street” and you will see high-rise buildings immediately in front of you, and the sound of busy people and cars rang in your ears. If you click on the forest, you will see a lush piece of trees in front of you, accompanied by the fragrance of birds and flowers. The all-round experience of sight, smell, hearing, and touch allows you to experience everything that happens in the virtual world and be completely in it. We can imagine that the future film technology will surpass the current “Avatar” many times.

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