A.3D technology principle
(1) Polarized glasses method
It uses the method of observing the scene by the human eye, and uses two parallel movie cameras to represent the left and right eyes of the person, and simultaneously shoot two movie pictures with horizontal parallax.
When the audience wears special polarized glasses, the left eye of the audience can only see the left image, the right eye can only see the right image, and the left and right images are stacked on the retina through the binocular convergence function, which is generated by the brain nerve. Three-dimensional visual effects. This 3D technology is not a true 3D technology, and its imaging is still a projection technology built on a two-dimensional plane.
(two) holographic 3D technology
Holographic principle
Holography is divided into two steps: the interference recording of the wavefront and the diffraction reconstruction of the wavefront [7]. Taking Fresnel holography as an example, the first is the interference recording of the wavefront, as shown in Fig. 1 is the recording light path of the Fresnel hologram.
Figure 1 Holographic recording light path
As shown in the figure, the laser beam passes through the shutter and is split into two beams through the beam splitting plate: the transmitted beam is reflected by the plane mirror M2, the beam expander L2 is expanded, and then projected as a reference light onto the holographic dry plate E; the reflected beam passes through the plane mirror The M1 reflection and beam expander L1 is expanded and irradiated onto the subject, and then diffused by the object as the object beam is also projected onto the E. The optical path of the entire optical path is on the same horizontal plane, and the beam passes through the center of each component. The angle between the object light and the reference light is around 45o.
In the dark, the holographic dry plate is clamped on the dry plate, so that the emulsion surface faces the object light and the reference light, and after standing for one minute, the timing exposure device is activated. The dry plate was removed and developed in a dark room. After washing with water, the fixing was rinsed with water for a while, and finally dried, and the hologram was prepared.
The reproduction of the hologram is described below [8], and the Fresnel laser hologram is reproduced by laser. The method of observing the virtual image is shown in Figure 2:
Figure 2 Observation of virtual image
The prepared hologram is returned to the position of the original object at the time of shooting, and the hologram is illuminated with the reference light, and the virtual image of the object can be observed at the position of the original object behind the hologram.
To observe the real image of the original object, it is necessary to use the conjugate light of the reference light to illuminate the hologram. Then, the light image can be used to receive the real image of the object behind the hologram, as shown in FIG.
Figure 3 Observation of real image
2. Holographic imaging principle
The imaging of holographic projection technology is a technique that does not require a conventional silver screen, but is projected on an air fog screen. Air fog screen projection imaging is a brand new air imaging device. The device uses the imaging principle of the mirage to present the light and shadow image by means of particles present in the air. Using a thin layer of water mist wall instead of the traditional projection screen allows you to shuttle freely through the screen image to achieve the illusory effect that a human can enter the video. The use of an atomizing device to generate a large amount of artificial fog, combined with the principle of air flow, can produce a screen to form a plane fog, and then project the projection device on the screen, thereby forming an imaginary stereoscopic image in the space, forming a kind of Three-dimensional stereoscopic images give people a new kind of stereoscopic visual enjoyment. Their images give people the feeling of being like a pedestrian painting. Painting in people is also true and illusory, such as being in a fairyland in Yaochi. Flickering, mysterious and seductive features develop some amazing display projects. On the misty fog screen, a mythical story like a magical reality is shown. It will bring an unprecedented audiovisual experience to the audience.
Air fog screen stereoscopic imaging display features: 1. Air fog screen imaging system includes a projector and an air screen system, the air screen system can create a fog wall formed by water vapor, using rear projection technology to project the image to almost watch In the air wall that is missing, the viewer will see images or movies floating in the air. 2. The air fog screen imaging generator can project computers, programs, infrared, laser, and radar through the projector's speed of light and wind field onto the fog screen to form a variety of dynamic and virtual images. 3. The air fog screen imaging system uses an integrated ultrasonic movement inside, no mechanical drive, quiet and no noise, high atomization efficiency, a certain concentration of negative ions, low failure rate and simple maintenance.
Air fog screen stereo imaging system principle: This system includes a proprietary projector and basic parts, in which the aerial image display appears from the front, the system does not require any additional screen, the main principle of image formation is to use air and a Small cabinet. Do not use special chemicals or harmful environments. The design of the Heliodisplay projection system is inspired by the imaging principle of the Mirage. A projection system consists of a projector and an air screen system. The air screen system can create a fog wall formed by water vapor, and the projector projects the image on it. Due to the imbalance of molecular vibration between the air and the fog wall, a layered and stereoscopic image can be formed.
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