First, background introduction

Holographic projection technology is essentially a new 3D imaging technology, which uses the principles of interference recording and diffraction reproduction to restore the real 3D images of objects. With the continuous development of holographic projection technology, it has been widely used in many fields of various industries, which has brought great changes to our life and also made our world more wonderful.

In 1947, British physicist Dennis Gabor invented holographic projection technology, and in 1962, Soviet scientists obtained the first three-dimensional optical holographic projection. In 1967, Goodman put forward the concept of digital holography. Photoelectric conversion devices such as CCD or CMOS were used to record interfered holograms instead of silver salt plates, and holographic reproduction of objects was realized through computer simulation of diffraction process. Although holographic projection appeared very early, it has been difficult to get commercial application due to the limitation of recording medium and reproducing medium. In the 21st century, the appearance of excellent medium and its more and more extensive application have greatly promoted the development of holographic projection technology.

Holographic projection technology is a kind of using the interference principle record and reproduce the real 3 d image of the object 3 d technology, the traditional photography can only record the strength of the light information, rather than on the depth of its information records, but in the process of the holographic projection, superposition of wave crest and wave will produce a higher effect, the superposition of peaks and troughs will be made low, and produces a series of irregular stripes, light and shade, a process that can convert the depth information into a signal intensity and record on the sensitive material. Holographic stereoscopic projection technology originated in the 1940s. At first, holographic stereoscopic projection technology was mostly used in electron microscopy technology. With the continuous development of technology, holographic stereoscopic projection technology has been gradually applied to performing arts activities, military activities, museum exhibition, architectural design, medical research and other activities, and left a deep impression on people.

By recording the object light wave carrying the 3D information of the object and restoring the wave-front information of the object, the 3D imaging of the originally recorded object can be realized. Holographic projection technology is a technology that utilizes the principle of light interference and diffraction to record the information of recorded samples in the form of interference fringes and restore the recorded samples through reproducing light irradiation recording medium. The core principles include two processes: interference recording and diffraction reconstruction.

First, the principle of interference is used for recording. The light source is divided into two parts. One beam of light irradiates the object to obtain the reflected or scattered object light wave, and the other part of light source irradiates the recording medium as the reference light wave, and the two beams of light interfere to form a series of light and dark stripes. The recording medium becomes a hologram after developing, fixing and other processing procedures. For digital holography,

CCD, CMOS and other photoelectric sensors are used to replace recording medium.

Realize diffraction reproduction by irradiating recording medium with reproduced light wave: holographic in recent years, digital image is a series of light and dark alternate stripes, when reproduced light wave irradiation, will produce a pair of twin images, respectively are reproduced image and conjugate image. The reproduction image has a highly realistic three-dimensional feeling.

The so-called "holography" refers to "all information", holographic imaging technology is the use of light interference and diffraction principle, early shooting, and through a special optical medium to reproduce the three-dimensional image of the shot image technology. Recording and reproducing, on a particular medium, all information of the light emitted by the photographed object by means of optical projection. Holographic imaging technology can also be called virtual imaging technology. Its imaging principle is to record the phase and amplitude of light wave of the object by means of light wave interference, and at the same time, display the light wave information of the object by means of diffraction principle, so as to achieve the imaging effect.

At present, holographic projection technology still has a great distance from large-scale commercial application, the specific reasons mainly include:

(1) Holographic imaging technology is quite complex, and the production cost is high. The cost of projection recording medium and reproduction medium is very expensive.

(2) The imaging of holographic projection is still limited by the site and is easily affected by the surrounding environment.

However, with the continuous improvement of technology, it is only a matter of time before the emergence of holographic projection media with excellent performance and higher cost performance and reproduction media. It is believed that in the near future, holographic projection technology can truly benefit ordinary families.

Application of Holographic Communication in Reports of the Two Sessions

This year in heilongjiang province CPPCC reports of "news broadcast" in heilongjiang province as the main platform, launched two special programs "the new journey of dream", comprehensive introduction of 5 g remote holographic imaging, VR studio, virtual host AI, such as advanced technology, innovation form, develop channels, through the "dragon depending on the news broadcast" the public, and new media platforms such as the "aurora" App screen small screen linkage, the outside will be in interaction, a comprehensive multi-dimensional medium transmission matrix, on the basis of secure broadcast, strive to show the packaging.

Delegates to achieve Beijing and Harbin holographic projection cloud interview between main studio, requires three conditions: first, Beijing front high quality signal acquisition, holographic video image needs to set up the environment, three high for 8 x 4 x 3 black camera obscura, decorate the lights of their subjects in a camera obscura, as well as the 4 k video camera acquisition equipment, structures, such as field monitor the return to equipment conditions; Secondly, in order to meet the security, high bit rate signal, interactive low delay transmission, need 5G transmission line support; Third, a holographic projection display device was built in the main studio behind Harbin. The special projection medium needed for display was placed in a black darkroom with a length, width and height of 8×4×3 the same size as the front end, and the matching transmission and decoding equipment and holographic projection medium LED screen display light source equipment were also required.

In the full virtual scene, the host interacts with the virtual host "Little Light" intelligently.Through three-dimensional animation, video, chart and other presentation methods, the "Government Work Report" is interpreted, creating a report interface with a sense of science and technology, three-dimensional, immersive and realistic sense. Dual-channel virtual studio packaging is the integration of different media forms (virtual, large screen, graphic, interactive, network) on the basis of media expression means such as text, image, sound, video, etc. Therefore, it is the development trend of deep studio packaging and production to meet the studio experience from more angles and richer vision.

Fig. 3 Commissioning site of "Light Reading Report" section

In response to the reports of the two sessions under special circumstances this year, we have the following features with technical support:

◆ Using 5G special line transmission + holographic projection equipment, focusing on creating a cloud interview between the host and the representative members;

◆ Make use of private cloud and Internet public cloud to transmit and record, and create cloud interview scene;

◆ In-depth interpretation of the government work report using VK virtual reality and AR augmented reality technology;

◆ We gather Internet conference system data and 1P streaming media data in the cloud, and realize the interaction of new media among netizens by means of cloud switching.

In short, it is to make more use of the emerging Internet technology to achieve the traditional end and the new media end of the safe transmission and program presentation. In the coverage of the NPC and CPPCC sessions in 2020 under special circumstances, Heilongjiang Radio and Television Station will use 5G special line transmission and holographic projection technology to complete the cloud interview of the NPC and CPPCC sessions under the condition that there are only three journalists in front of them.