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The current holographic technology is false!
Don't be surprised. The hologram technology has indeed been around for 70 years. In 1947, the British Hungarian physicist Dennis Gabor, the invention of holographic projection was a coincidental discovery by Gabe when he studied the means to enhance the performance of electron microscopy at British company BTH. His work won the 1971 Nobel Prize in physics. . This technology has been applied to electron microscopy since the beginning of the invention, and is called electronic holographic projection technology in this field. 
Jay Chou and Teresa Teng sang this technique across the air. Teresa's three-dimensional images were made in advance using computer technology. Then, the film was played on a holographic projection film on the stage through projection. The giant holographic film is placed on the stage at an angle of 45 degrees and refracted through the projection of the ground. This holographic film is semi-transparent, semi-transparent, and semi-transparent, producing a realistic spatial effect while maintaining a clear image.
This kind of fake hologram can be very simple to do the actual steps at home, first prepare the ruler, scissors, compasses, glue (or transparent tape). Material: Plain transparent plastic film (not too soft), scratch paper. Of course there must be a device that can play video, such as a mobile phone or tablet.
Note: The isosceles triangle has an apex angle of 70.2 degrees. "The bottom edge is equal to the width of the screen." This does not need to be too standard, as long as it is not smaller than the width of the video being played. 
Step 4: Attach the edges of the edge with glue or tape to form a pyramid. 
Seeing more sci-fi films feels right in the way if we put a device like a watch in a sci-fi movie to be able to produce a virtual object that matches the size of the object, is not affected by light, and can be perfectly rendered at any angle. Scenery, it is estimated that will not appear in the next few years. Because there is no medium, the light will not be refracted, which means that this technology can be turned in the air. The closest technology at present is the air projection and interaction technology invented by Chad Dyne, a graduate student at the Massachusetts Institute of Technology. The image can project images with interactive functions in the medium formed by airflow. 
Looking at science fiction films, I feel that this is something that should naturally exist. In this article, although the author poured cold water on more than one occasion, I was in the same mood as everyone was eager to experience the experience of being in an unreal world. At present, VR, AR and other virtual reality technologies are hotly developed on the market, letting us experience more or less what is the visual effect that makes the human eye feel exactly the same as the actual environment. With the continuous development of holographic projection technology, it is believed that the application of the future will become more and more extensive and more and more perfect. By then, we will really enter the age of science fiction.
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Why holographic images have not been popular for 70 years?
There is always someone who has such illusions. In the future, humans can completely abandon display products with screens such as televisions, computers and mobile phones. Just like in a variety of sci-fi and spy warfare movies, with a swipe of a hand, a large screen of multi-page charts or photos appears directly in front of the screen, without touching the screen, waving by hand, the content on the screen is natural Switch. Even people of different time and space can talk face to face. These are collectively referred to as holographic technology.
Why holographic images have not been universal
Someone may have just read the first paragraph, and they are already too impatient to prepare for an interview with the author of the commentary area. You may say that holographic technology has already appeared for a long time and it has already begun to be widely used. Say a few years ago in the Jay Chou concert with the legendary singer-Teresight Teresa of the deceased starring in the air, at the time of the concert set up a 3D holographic projection equipment, and after a precise set of training finally presented as if there is a real Teresa. There is also a virtual singing vocalist Hatsune Miku concert. Holographic technology has also appeared frequently in large-scale stage programs such as the Olympic Games and Spring Festival Gala. Holographic technology appears frequently in science fiction movies
When the scenes we saw in various science fiction movies lived in front of us, the world began to praise these black technologies. I was really shocked by these fantastic virtual reality, but calm down and observe carefully. All of them have some common flaws: the scene is fixed and it is in a dark environment when it is displayed. This is very different from the operation of Tony Stark in Iron Man using the holographic technology under the headlights shining office. Hatsune Miku Concert Live Concert
The author believes that some of the previously mentioned holographic imaging techniques mentioned in the article, some of which can not be completely called holographic technology, and even that they are all "false holograms" cannot be overstated. So what exactly is a hologram? Why has this technology been in existence for more than 70 years and why has it not been popular so far? The real holographic image is probably this kind of
According to the definition given by Wikipedia, true holographic technology refers to the recording and viewing of images through the principle of coherent light (laser is one of them). When properly presented, it can accurately reproduce the three-dimensionality of recorded objects. Exterior. It is a photographic technique that records all the information (amplitude, phase) in the reflected (or transmitted) light wave of the object, and the light reflected or transmitted by the object can be completely reconstructed by the recording film as if the object were there. By observing the photos in different orientations and angles, you can see different angles of the objects being photographed, so the recorded images can give rise to stereoscopic vision. Jay Chou and Teresa Teng are not really holographic
Simply put, the real holographic image can be said to be different from any medium. The image can be displayed from the air in the horizon, and the viewing angle can be freely changed, and the experiencer can smoothly navigate from the three-dimensional image. Some of the shocking scenes we've seen so far, such as Jay Chou's concert, Hatsune Miku virtual singer mentioned above, are not really holographic. "Pappel phantom" schematic
It is a pity that there is no technology in the world that has not been directly presented through the air without passing through other mediums, and even relevant theories have not been formed. At present, the vast majority of the so-called holographic techniques used in the stage performances we see are all “Pappel illusions†or projections. They should not be called holograms. Picture from Baidu experience
Picture from Baidu experience
Picture from Baidu experience
Production process: Step 1: Determine the width of the screen and use a ruler to measure the width. My phone 4.9cm Step 2: Draw a circle on the draft paper with the waist length of the isosceles triangle as a radius. At any point on the circle, make a circle. The radius is the base of the isosceles triangle (that is, the screen width). Step 3: A plastic film covers the drawn circle and holes are marked at the vertices of the triangle. Use a knife to cut the four connected isosceles triangles. Picture from Baidu experience
Picture from Baidu experience
Operation: Download a piece of 3D holographic video or picture, open the phone and place it horizontally on the pyramid. The center of the screen corresponds to the spire, try to hold it. And the surrounding environment is better that the dark field lights should not be too bright, look directly at the pyramid side, so that a holographic image will be projected. Air projection and interaction technology invented by Chad Dyne
Let us expand the concept of holographic technology. The “Pappel phantom†mentioned above is regarded as holographic technology. It is still very difficult to popularize in the consumer market. Due to the high cost and the harsh environmental requirements, Jay Chou continued to sing and sing. For example, Jay Chou and a group of 45 special effects artists fought for more than two months and yelled at NT$100 million before they could successfully resurrect Teresa Teng. ". Most of the current market is still such pyramidal holographic projection
In addition, this technology also has considerable restrictions on the environment. In order to guarantee the projection quality, no strong light source can appear around the projection device during operation. This is why current holographic projection devices are only used in large-scale concerts or large-scale conferences, and have not been popularized in the consumer market. Believe that the future holographic technology will become more and more comprehensive
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