The holographic projection technology in AR turned out to be the case.

What is the highest level of attention in the technology circle today? Holographic projection technology is definitely ranked. The technique was invented in 1947 by the British Hungarian physicist Dennis Gaber, who won the 1971 Nobel Prize in Physics for his work. This technology has been used in electron microscopy since its inception, and is known in this field as electronic holographic projection technology, but it was only after the invention of the laser in 1960 that holographic projections made substantial progress. Now, the well-known Microsoft Hololens and Magic Leap called the mysterious black technology is the use of this technology. Today, let's take a closer look at holographic projection technology.

Holographic projection is a display technology that requires media and can be done in real time and can interact with people. We call its medium "holographic medium", which cannot be produced out of thin air, which is why this technology is currently difficult to popularize. The holographic projection projects the image onto the holographic medium, presenting a 3D effect in front of people's eyes. This technology is also known as virtual imaging technology, and now it is very hot augmented reality (AR).

Classification of holographic projections

Holographic projections can be divided into the following categories. Transmission holographic projections, such as those invented by Lith and Upat Nix, by illuminating a holographic projection film with a laser and then observing the reconstructed image from another direction. Later on, the rainbow holographic projection can be illuminated with white light to observe the reconstructed image. Rainbow holographic projection is widely used in areas such as credit card security and product packaging. These types of rainbow holographic projections typically form a surface relief pattern on a plastic film and then re-image the image by passing an aluminum film on the back side through the film. Another common holographic projection technique is called reflection holographic projection, or Danny Suk holographic projection. This technique can reconstruct a color image by reflecting it in the same direction as the observer by using a white light source to reconstruct the image. Mirror holographic projection is a related technique for fabricating three-dimensional images by controlling the motion of the mirror on a two-dimensional surface. It constructs a holographic image by controlling reflected or refracted light, while Geber's holographic projection reconstructs the wavefront by diffracting light.

The key reason for the holographic projection to thrive in a short period of time is the mass production of low-cost solid-state lasers, such as those used in DVD players and other commonly used devices. These lasers have also greatly contributed to the development of holographic projection. These inexpensive, small-sized solid-state lasers can compete with the large, expensive gas lasers originally used for holographic projection under certain conditions, allowing researchers with lower budgets, artists, and even amateurs to participate. To the holographic projection research.

The principle of holographic projection

Front-projected holographic display, also known as virtual imaging technology, is a technique for recording and reproducing the recording and reproduction of a true three-dimensional image of an object using the principles of interference and diffraction.

The first step is to record the light wave information of the object by using the interference principle. This is the shooting process: the object forms a diffuse object beam under laser irradiation; the other part of the laser beam is used as a reference beam to the holographic film, and the object beam is superimposed. Interference is generated to convert the phase and amplitude of each point on the object's light wave into a spatially varying intensity, thereby recording all the information of the object light wave using the contrast and spacing between the interference fringes. After the film on which the interference fringes are recorded is subjected to processing procedures such as development and fixing, it becomes a hologram, or hologram.

The second step is to use the principle of diffraction to reproduce the light wave information of the object. This is the imaging process: the hologram is like a complex grating. Under the coherent laser illumination, the diffracted light wave of a linearly recorded sinusoidal hologram can generally give two The image, the original image (also known as the initial image) and the conjugate image. The reproduced image has a strong stereoscopic effect 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, and multiple different images can be recorded on the same film by multiple exposures. And they can be displayed separately without interference.

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