1. Principle of 3D technology
(1) Polarized glasses method
It uses the human eye to observe the scene, and uses two movie cameras arranged side by side to represent the left and right eyes of the person, and simultaneously shoots two movie images with a slight horizontal parallax.
When the audience wears special polarized glasses, the left eye of the audience can only see the left image and the right eye can only see the right image, and the left and right images are superimposed on the retina through the convergence function of the eyes Three-dimensional visual effect. This 3D technology is not a real 3D technology, and its imaging is still a projection technology built on a two-dimensional plane.
(2) Holographic 3D technology
1. The principle of holography
Holography is divided into two steps: wavefront interference recording and wavefront diffraction reconstruction [7]. Taking Fresnel holography as an example, the first is wavefront interference recording, as shown in Figure 1 is the recording optical path of Fresnel holography.
Figure 1 Holographic recording optical path
As shown in the figure, after passing through the shutter, the laser beam is divided into two beams by the beam splitter plate: the transmitted beam is reflected by the plane mirror M2, the beam expander L2 is expanded and used as the reference light to project on the holographic dry plate E; The M1 reflection and the beam expander L1 expand the beam and illuminate the subject, and then diffuse reflection through the object as the object beam is also projected onto E. The optical axis of the entire optical path is on the same horizontal plane, and the light beam passes through the center of each element. The angle between the object light and the reference light is about 45o.
Clamp the holographic dry plate on the dry plate rack in the dark, make the photosensitive emulsion face the object light and the reference light, and let it stand for one minute to start the timing exposurer. Remove the dry plate, develop in a dark room, fix it for a period of time after washing with water, rinse with water, and finally dry it, the hologram is ready.
Let's talk about the reproduction of holograms [8]. Fresnel laser holography is reproduced by laser. The method of observing the virtual image is shown in Figure 2:
Figure 2 Observation of the virtual image
Put the produced hologram back to the position of the original object at the time of shooting, illuminate the hologram with reference light, and the virtual image of the object can be observed at the position of the original behind the hologram.
If you want to observe the real image of the original object, you need to use the conjugate light of the reference light to illuminate the hologram. You can use the light screen to receive the real image of the object behind the hologram, as shown in Figure 3.
Figure 3 Real image observation
2. The principle of holographic imaging
The imaging of holographic projection technology does not require the traditional silver screen technology, but adopts the projection on the 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 light and shadow images with the help of particles present in the air. Use a thin layer of water mist wall instead of the traditional projection screen, so that you can shuttle through the screen image at will, to achieve the unreal effect that real people can enter the video screen. A large amount of artificial fog is generated by the atomizing equipment, and a screen that can form a flat mist is manufactured in combination with the principle of air flow, and then the projection equipment is projected on the screen to form an unreal stereoscopic image in space, forming a kind of The three-dimensional space three-dimensional image gives people a new stereoscopic visual enjoyment, and the image gives people the same feeling as in a pedestrian painting. It is also true and illusory, like being in a fairy pond in a pond. Suddenly, some mysterious and attractive features develop some amazing display projects. On the misty fog screen, a mythical story like a fantasy is shown. Will bring viewers an unprecedented audiovisual experience.
Air fog screen stereoscopic imaging display features: 1. The 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. The rear projection technology is used to project the image to almost In the invisible air wall, the viewer will see images or videos floating in the air. 2. The air fog screen imaging generator can project computers, programs, infrared, laser, and radar onto the fog screen through the projector light speed and wind field, forming a variety of dynamic and virtual images. 3. An integrated ultrasonic movement is used inside the air fog screen imaging system, which has no mechanical drive, quietness and noise, high atomization efficiency, generates a certain concentration of negative ions, low failure rate and simple maintenance.
The principle of the air fog screen stereo imaging system: this system includes a proprietary projector and basic parts, in which the aerial image display looks used from the front, the system does not require any additional screen, the main principle of forming an image is to use air and a Small cabinet. Do not use special chemicals or harmful effects on the environment. The design of the Heliodisplay projection system is inspired by the imaging principle of the Mirage. A projection system includes a projector and an air screen system. The air screen system can create a fog wall formed by water vapor. The projector projects the picture on it. Due to the imbalance between the molecular vibrations of the air and the fog wall, it is possible to form images with strong levels and three-dimensional sense
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