What technical principles are used in Hatsune Miku 3.9 concert!

Because "Hatsune Miku" is a virtual image, the "Hatsune Miku" in this concert was completed through a complete set of 3D holographic projection technology, and the singing was completed using holographic imaging technology. It is globally recognized This is the first time, and this move can be seen as a leap in the history of human video entertainment. Although similar new technologies have been exhibited at some large-scale performances before, the colors were single and the time was very short. However, in this "Hatsune Miku" concert, the cute and popular idol "Hatsune" used all the Colorful images appeared, and the performance lasted for 2 hours. During the period, the stunning performance and real image experience made people ashamed.

The technology used in "Hatsune Miku" is holographic projection technology. Some people may still remember that in "Star Wars", when the alliance leaders were meeting, they were all shrouded in a circle of bright light. This does not mean that they are gods, but simply because they are not present but are three-dimensional objects projected through holographic technology. portrait.

Holographic technology is a technology that uses the principles of interference and diffraction to record and reproduce the true three-dimensional image of an object. The first step is to use the principle of interference to record the light wave information of the object. This is the shooting process: the object is irradiated by laser to form a diffuse object beam; another part of the laser is used as a reference beam to shoot onto the holographic film, and is superimposed with the object beam. Interference is generated, and the phase and amplitude of each point on the object's light wave are converted into spatially varying intensity, thereby recording all the information of the object's light wave using the contrast and spacing between interference fringes. After the film recording the interference fringes undergoes development, fixation and other processing procedures, it becomes a hologram, or hologram; the second step is to use the principle of diffraction to reproduce the object's light wave information. This is the imaging process: the hologram is like a For complex gratings, under coherent laser irradiation, the diffracted light wave of a linearly recorded sinusoidal hologram can generally give two images, namely the original image (also called the initial image) and the yoke image. The reproduced image has a strong three-dimensional sense and has a real visual effect. Each part of the hologram records the light information of each point on the object, so in principle, each part of it can reproduce the entire image of the original object. Through multiple exposures, multiple different images can also be recorded on the same negative. And they can be displayed separately without interfering with each other.

The principles of holography are applicable to various forms of waves, such as X-rays, microwaves, sound waves, electronic waves, etc. As long as these fluctuations are coherent enough to form an interference pattern. Optical holography is expected to be used in three-dimensional movies, television, exhibitions, microscopy, interferometry, projection lithography, military reconnaissance and surveillance, underwater detection, metal internal detection, preservation of precious historical relics, artworks, information storage, and remote sensing. , it has been widely used in various aspects such as studying and recording instantaneous phenomena and instantaneous processes (such as explosions and combustion) that change physical states very quickly.

In life, we can often see the application of holographic photography technology. For example, on some credit cards and banknotes, there is a "rainbow" holographic image on polyester soft film produced using the full-color holographic image technology invented by Russian physicist Yuri Denisuk in the 1960s. . However, these holographic images are mostly used as a complex printing technology to achieve anti-counterfeiting purposes. Their sensitivity is low and the colors are not realistic enough, far from being realistic. Researchers are also trying to use dichromate glue as a photosensitive emulsion to make holographic identification devices. Some fighter jets are equipped with such devices, which allow the pilot to focus on the enemy. Using this technology to photograph some precious cultural relics, the cultural relics can be reproduced in a true three-dimensional manner for visitors to appreciate when on display. The original objects are properly preserved to prevent theft. Large holograms can display cars, satellites and various three-dimensional advertisements. , pulse holography can also be used to reproduce portraits and wedding photos. Small holograms can be worn around the neck to form beautiful decorations, recreating favorite animals, colorful flowers and butterflies. The rapidly developing molded rainbow holograms can not only become vivid cartoons, greeting cards, and three-dimensional stamps, but also appear as anti-counterfeiting marks on trademarks, ID cards, bank credit cards, and even banknotes. The holographic stereoscopic photos decorated in books and the holographic rainbow shining on gift packages allow people to experience the new leap in printing and packaging technology in the 21st century. The molded holographic logo, due to its three-dimensional layering, rainbow effect that changes with the viewing angle, and ever-changing anti-counterfeiting marks, coupled with its close integration with other high-tech anti-counterfeiting means, has pushed anti-counterfeiting technology into the new century. the culmination of glory.

If you want to see holographic images, you must first improve the shooting equipment. When shooting holographic images, the camera not only needs to record the reflection intensity on the object, but also the phase information. When viewing, you need to use a polygonal pyramid composed of a highly transparent medium, and then through optical reflection to see the three-dimensional effect. Of course, as an emerging technology, holographic imaging technology is not yet perfect, and issues such as clarity and capacity have not yet been properly resolved. However, it would be wonderful to see the scenes in the film actually unfold next to you or above you. Although it is still "a long way to go" to watch holographic movies, after persistent "searching", I believe that watching holographic movies will no longer be a dream in the near future.