1、 Overview

Founded in 2016, Nanjing Daqi Digital Technology Co., Ltd. (DSee. Lab) is a company initiated by Southeast University and Nanjing University hardware geeks, focusing on holographic display equipment research and development and creative visual effect design. Daqi is the key training object of the national high-tech enterprises, Jiangsu double soft enterprises, the "Venture Nanjing" high-level talent introduction plan and the "Incubation and Incubation Project of Jiangsu Science and Technology Department".

Dusqi Digital Technology has created "5G holographic call application" by taking advantage of the advantages of naked eye 3D holographic imaging technology and using an information processing mode of holographic terminal to call system. The application system integrates the functions of portrait segmentation, holographic communication, human-computer interaction, etc., and integrates the existing holographic visual business service ecosystem from technology, products, scenes, platforms, etc. It can be mounted on a variety of holographic screen display devices, with a wide range of application scenarios, providing a platform for the deep integration of 5G and display technology.

2、 Product features

"5G holographic call application" combines several breakthrough achievements to realize the deep integration of holographic display technology and real-time call technology.

Features of "5G holographic calling application"

（1） Face sampling

Through the accurate detection of 106 key points of the face, the "5G holographic call application" divides the dynamic picture between the portrait and the background, and can complete real-time matting and background deletion without the green screen.

The application has the following characteristics in face sampling: first, it supports 48kHz full band sampling, providing ultra-high sound quality experience; It supports up to 1080P resolution, and the bit rate can be switched freely. It integrates a variety of leading video coding processing algorithms, with better picture quality and lower bit rate. The second is to support beauty, stickers, emotion recognition, body recognition, gesture recognition, etc., with rich scene playing methods and AI auxiliary functions. The third is to support real-time dark light enhancement algorithm, which can provide clear and bright images even in dark environments. The fourth is the use of the AI algorithm as the core of the portrait detection and segmentation technology, high accuracy and timeliness.

（2） Safety management

In terms of security, "5G holographic calling application" adopts two authentication methods, namely App ID and App ID+App certificate+Token, for identity authentication when calling. After using the App ID+App Certificate+Token authentication method, users can generate an instant token through the App ID and App Certificate. After using the token to complete authentication, they can manage the channels under the project.

（3） Content encryption and transmission encryption

The application encrypts information data for content and transmission respectively. In terms of content encryption, users can configure the symmetric encryption algorithm used by the Native SDK (currently supporting AES 128/256) to encrypt the transmitted audio and video streams end-to-end, complete content encryption at the sending end, and complete data decryption at the receiving end.

In terms of transmission encryption, in order to ensure the confidentiality of audio and video data in the transmission process, all products and services use the transmission encryption mechanism covering the full data link, using the industry's mainstream strong encryption algorithm. The transmitted data is transmitted via the network in the form of ciphertext. The user manages the generation, storage, transmission and verification of the key.

"5G holographic call application" process

3、 Application scenarios

Daqi Digital Technology continues to explore the application and innovation of 5G holographic call in government affairs, finance, education and other fields. From cloud office, cloud conference, to various visual display terminals, 5G holographic call is applied to a variety of scenes.

（1） 5G Holographic Mayor Reception Day Solution

In order to meet the needs of the industry, the "5G Holographic Mayor Reception Day" solution based on 5G communication technology came into being. The solution of "5G Holographic Mayor Reception Day" can help "mayors" complete their work more conveniently and efficiently, and become the most intuitive communication bridge between the government and the people. The solution of "5G Holographic Mayor Reception Day" can help solve the communication problems caused by geographical separation and improve the service effect.

（2） 5G holographic financial expert system

"5G Holographic Financial Expert System" helps experts achieve "on-site" guidance, and forms a "1-to-N" guidance system and "expert online" mode. Flat conference mode adopted by "5G holographic financial expert system". It can solve the problem that individual experts cannot attend important meetings due to temporary arrangements, facilitate more experts to participate in them, and greatly improve efficiency.

（3） 5G holographic digital customer service system

Through 5G network transmission of holographic portrait and voice consultation explanation, "5G holographic digital customer service system" connects users with remote customer service, realizes "face-to-face" communication, solves information confirmation and guidance problems in user business processing, can better meet user needs, improve customer service efficiency, and save enterprise costs.

（4） 5G holographic distance education system

Through the transmission of 5G network, "5G holographic distance education system" can collect terminals, application systems, platforms, and content, so that high-quality teaching resources can be transmitted remotely, and create an interactive teaching mode of two teachers in different places. The "5G holographic distance education system" will deliver the classes of famous teachers in famous schools to the required places, which is conducive to the high-quality and balanced development of education.

4、 Social evaluation

At present, the 5G holographic customer service system built by DasChi Digital Technology has been successfully put into use in some exhibition halls of financial companies, mainly for financial product explanation, customer reception, etc. Customer feedback: "The application of holographic intelligent AI not only adds a sense of science and technology to the enterprise exhibition hall, but also improves the efficiency of customer service and saves enterprise costs. Digital customer service has become an indispensable part of us."

In September 2020, DSee. Lab 5G holographic digital customer service system was successfully selected as one of the "Top 10 Typical Innovation Cases of" 5G+Smart Finance "by the Chinese Academy of Information Technology and Communications. Comments of China Academy of Information and Communications: "It has realized remote real-time holography for customer service, combined with the ability of AI digital people, and provided intelligent functional guidance."

5、 Conclusion

"5G holographic call application" makes full use of 5G's characteristics of large bandwidth, low delay, and high traffic density to realize the deep integration of holographic display technology and real-time call technology, provide services for a variety of scenes, and enhance the user's sense of experience.

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