1. Is the virtual image on the stage holographic?
The most common holographic projection is found in various concerts. 20 10 Hatsune Hatsune, a famous Japanese virtual idol, appeared in the concert through holographic projection technology. Although the technology at that time was not mature enough, when the stereo initial sound appeared, it still attracted widespread attention. The effect change from 2D to 3D has seriously affected a group of otaku neurons. Similar technology is now widely used on the stage, which seems to be a sense of science and technology. Many people call it? Holographic projection? . Unfortunately, these are not holographic projection techniques. Their real name is Popper illusion. Although it is similar to holographic technology, it is similar to reality? Holographic projection? There is still a difference.
2. Pepper's illusion:
This is an ingenious optical illusion technology, and its principle is not complicated. When the light shines on the real performer, a specific area on the stage is mapped through the glass, forming a virtual image in the above picture. This is the imaging process of Berber illusion. Today, with CG technology and high-brightness lighting, Pepper's illusion is vivid.
3. What is holographic projection technology?
The first step is to record the light wave information of the object by using the interference principle, which is the shooting process. Irradiating an object with laser to form a diffused object beam; The other part of the laser beam is used as a reference beam and is incident on the hologram. The hologram and the object beam overlap to produce interference, and the phase and amplitude of each point on the object light wave are converted into spatial variation intensity, thus recording the contrast between interference fringes and all the information of the light wave between objects. The negative recording interference fringes become holograms after being developed and fixed, which is called holograms.
Step two, the hologram is like a difficult grating. Under the irradiation of laser, the light wave of sine hologram can produce two images, namely the original image (also called the initial image) and the yoke image. The reconstructed image has strong stereoscopic effect and real visual effect. Each part of the hologram records the light information of every point on the object. Therefore, in principle, each part of the hologram can reproduce the whole image of the original object. Through multiple exposures, multiple different images can be recorded on the same negative and the interference can be displayed.