already In 2010, the movie "Avatar" was released, and the Chinese people experienced the shocking effect of 3D display technology. The immersive viewing experience made people relish for a long time. 3D stereoscopic effects give people an unprecedented "real" visual experience. In fact, after HD, 3D has become the next center of gravity for display devices.
While marveling at the changes brought about by technology, it is necessary to understand the past life of 3D technology and see how those 2D images jump out of the paper.
The human eyes are side by side, with an interval of about 6 to 7 cm, so the image seen by the left eye is slightly different from the image seen by the right eye. This difference is called "parallax", the brain. It will interpret the parallax of both eyes and use it to judge the object's distance and stereoscopic vision.
We will talk from the human eye. The eyes of the person are separated by about 6 cm, which means that if you look at an object, the two eyes are viewed from the left and right viewpoints. The left eye will see the left side of the object, while the right eye will see her middle or right side. When the objects seen by both eyes are imaged on the retina, the impressions on the left and right sides are combined to give the final three-dimensional feeling. And this effect of obtaining a stereoscopic effect is "visual displacement."
If you are making a 3D movie, use two cameras to simulate the left and right parallax, take two films separately, and then show the two films to the screen at the same time. Add the necessary technical means to the audience to make the left eye only You can see the left eye image, and the right eye can only see the right eye image. After the last two images are superimposed on the brain, we can see a picture with a stereoscopic depth. This is what we call 3D images.
As early as the 19th century, when photography was just started, people used two cameras with the same performance and parameters to juxtapose the left and right eyes of the person, and took two photos with slight differences, and then passed the parallel line of sight method. Cross-line method, or exclusive viewing equipment like binoculars, allows two left and right eyes to watch two photos taken side by side to reproduce the "parallax" to simulate stereoscopic vision.
With the increasing application of stereoscopic display technology in the fields of television broadcasting, video games, medical treatment, education, etc., three-dimensional display has developed from movie screens to television terminals, computer terminals, smart phone terminals, tablet terminals, and the like.
At present, mainstream three-dimensional displays include stereoscopic vision, helmet-mounted displays, CAVE, naked-eye stereoscopic displays, and true three-dimensional displays. 3D display technology is mainly divided into two types: glasses 3D display technology and naked eye 3D display technology.
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