What is 3D Imaging?

The advent of holographic display technology has brought hope to true stereoscopic 3D TV. Compared with stereo television, holographic television has the advantage not only that the stereo three-dimensional image is closer to the object itself, but also from the psychological cues of the human eye on the physical depth of the object.

3d holographic imaging technology

The advent of holographic display technology gives true stereo

Note: Holographic display technology (holographic display) does not refer to holography or holography, invented by Dennis Gabor in 1956. It is a next-generation display technology that projects three-dimensional stereoscopic images in three-dimensional space (the images are physically "stereo" rather than purely visual "stereo"). In view of the lack of public academic research on holographic imaging technology in China, part of the content of this encyclopedia page may explain incorrect definitions and mislead readers. The content may be describing holography rather than holographic imaging technology. Please check it carefully.

Do not revoke this first level directory until the relevant pages are improved.

Basic mechanism of holographic display

Holography has developed rapidly since the advent of lasers in the 1960s. The basic mechanism is to use

Why humans can feel

As people gradually become dissatisfied with the visual effects brought by ordinary 3D stereo imaging, and more

1. The reconstructed three-dimensional image is conducive to preserving precious art materials for collection.

2. Every point is recorded on any point of the hologram when shooting. It doesn't matter if the photo is damaged.

3.

The principles of holography apply to various forms of fluctuations, such as

3d holographic imaging technology

Holographic photography refers to a new type of photography technology that records all the information about the amplitude and bit of the reflected wave of the subject. Ordinary photography records the light intensity distribution on the surface of an object. It cannot record the phase information of the reflected light from the object, so it loses the three-dimensional sense. Holographic photography uses laser light as the illumination light source, and divides the light emitted by the light source into two beams, one beam is directly directed to the photosensitive sheet, and the other beam is reflected by the subject and then directed to the photosensitive sheet. The two beams of light are superimposed on the photosensitive film to cause interference. The sensitivity of each point on the photosensitive film varies not only with the intensity but also with the phase relationship of the two beams of light. Therefore, holography records not only the intensity of the reflection on the object, but also the phase information. When the human eye directly looks at this photosensitive negative film, only interference fringes like fingerprints can be seen, but if a laser is used to illuminate it, the human eye can see the same three-dimensional stereo image of the original object through the negative film. Even if only a small part of a holographic picture is left, it can still reproduce all the scenes. Holography can be used in many fields such as nondestructive testing, ultrasonic holography, holographic microscope, holographic memory, holographic film and television.

3d holographic imaging technology shooting requirements

In order to take a satisfactory hologram, the shooting system must have the following requirements:

(1) The light source must be a coherent light source?

According to the previous analysis, holography is based on the interference principle of light, so the light source must be very coherent. The advent of lasers provides an ideal light source for holography. This is because the laser has good spatial coherence and time coherence. In the experiment, a He-Ne laser was used, and a small diffusive object was taken with it to obtain a good hologram.

(2) Should the holographic system have stability?

Because interference fringes are recorded on the holographic negative, and they are thin and dense interference fringes, even the smallest interference during the photographing process will cause the interference fringes to be blurred, and even make the interference fringes unrecordable. For example, if the film is shifted by one micrometer during the shooting, the fringes will be indistinguishable. For this reason, the holographic laboratory bench is required to be shockproof. All optical devices on the holographic stage are firmly fixed on the work surface steel plate with magnetic material. In addition, the air flow through the light path, sound wave interference and temperature changes will cause changes in the surrounding air density. Therefore, loud noise should not be allowed during exposure, and you should not move around at will to ensure that the entire laboratory is absolutely quiet. Our experience is that each group is adjusted After the light path, the students left the experimental platform, stabilized for one minute, and then exploded at the same time to get better results. ?

(3) Should object light and reference light meet?

The difference between the path length of the object light and the reference light should be as small as possible. The path length of the two beams should be equal. It should not exceed 2cm at most. Use a string to measure the light path. The angle between the two speed lights should be 30 °. 60 °, it is best to be about 45 °, because the angle is small, the interference fringes are thin, so the requirements for the stability of the system and the resolution of the photosensitive material are low; the ratio of the light intensity of the two beams should be appropriate, generally It is required to be between 1: 1 and 1:10, and the light intensity ratio is measured by a silicon photocell.

(4) Use a high-resolution holographic film?

Because fine and dense interference fringes are recorded on holographic negatives, high-resolution photosensitive materials are required. Photographic negatives for general photography can only record 50 to 100 stripes per millimeter due to the coarser particles of silver. The type I holographic dry plate produced by Tianjin Photographic Film Factory has a resolution of 3000 per millimeter, which can meet the holographic Photo requirements.

(5) The process of developing holograms?

The rinsing process is also very critical. We formulate according to the formulation requirements, and formulate the developing solution, stopping solution, fixing solution and bleaching solution. The above-mentioned several prescriptions require the preparation with distilled water, but experiments have proved that the preparation with pure tap water also obtain success. The rinsing process should be performed in a dark room. The chemical solution must not be exposed to light. Rinse at a temperature of about 20 ° C. Prepare the solution once and store it properly.

Holographic 3D virtual display (6 photos)

Can be used for about a month.

Application of 3d holographic imaging technology

Holographic imaging technology is used in media reporting, commercial window display, and promoting Buddhism to give full play to the advantages of stereoscopic image display. In the future, holographic imaging technology will become more popular in our lives.

How is holographic imaging applied?

Since holographic imaging technology has many advantages, how does it combine the characteristics of different industries to take advantage of this technology? Below we will introduce some existing holographic image application cases for your reference.

Projection applications: Holographic imaging technology that can penetrate space

New projection application: fun Korean 3D dance window show

Application of projection technology: suspended floating rotation of three-dimensional Buddha image in the air

The above are the applications of holographic imaging technology in media reporting, commercial window display, and promotion of Buddhism, fully utilizing the advantages of stereoscopic image display. In the future, holographic imaging technology will become more popular in our lives.

Future holographic image applications

This video is a promotional video of future life shot by NTT DoCoMo. With the help of holographic imaging technology, ideal face-to-face interactive distance teaching and video conferencing can be realized. We will also continue to pay attention to the development of holographic imaging technology.