Three-dimensional reconstruction of real scene

At first glance, the word seems difficult to understand.

Look carefully, in fact, it is easy to understand.

Make a noun explanation first.

Easy-to-understand official noun explanation:

3D real scene is a digital virtual space that reflects and represents human production, life and ecological space in a real, three-dimensional and orderly way. It is a new standardized product of basic surveying and mapping, an important part of national new infrastructure construction, and provides a unified spatial foundation for economic and social development and informatization of various departments. By bearing the structural, semantic and man-machine compatible understanding and real-time perception of the Internet of Things on the 3D geographical scene, we can build a real 3D. According to the expression, it is usually divided into terrain level, city level and component level.

—— Technical Outline of True 3D China Construction (202 1 Edition)

Popular version:

In order to meet some requirements, such as space display, information retention, intelligent simulation, etc., real spaces and scenes in the real world are collected and processed by some technical means. It is not difficult to see that the essence of 3D reconstruction of real scene is actually playing with data. The process of 3D reconstruction of real scene can be simply summarized as: data production (spatial 3D data collection) → data processing (3D modeling) → data application (such as spatial display and real scene simulation). ).

Let's talk about the three-dimensional application of real scenes. Basic edition: space display, online cloud tour, one-click arrival.

Spatial display can be regarded as the most basic application of three-dimensional real scene, and the most typical application is in cultural exhibition, corporate marketing, corporate image display and so on.

Nowadays, many museums or some exhibition halls are online virtual exhibition halls or digital exhibitions. Visitors can visit the exhibition hall online, usually with various functions such as tour guide, voice explanation, etc., and they can also visit it online in an immersive way, which is really interesting. And this digital cloud exhibition hall can also help the promotion and marketing of various exhibitions.

In addition, in order to show the corporate image and strength, many enterprises will re-create their corporate office environment or factory base online by using 3D reconstruction technology, which can be used to show their corporate image, and they can also add guided tours on the basis of the display for visiting or recruitment guidance, which not only shows the company's strength, but also improves work efficiency, which can be described as the best of both worlds.

Advanced edition: information is retained, so that valuable information will never be lost.

The most typical information retention is the protection of cultural relics. In the process of archaeological excavation, each excavation stage is irreversible, so it is necessary to make records of different excavation stages. The main recording methods are words, photos and drawings. However, the traditional recording method may be greatly influenced by natural conditions and professional resources, which is relatively intuitive and difficult to simulate and reproduce the archaeological site environment. Three-dimensional reconstruction of real scenes has become a new choice for archaeological investigation and recording because of its accuracy, intuition, convenience and efficiency.

In addition, the excavated cultural relics or some ancient buildings will gradually age or decay over time, or encounter accidents, such as the fire in Notre Dame de Paris, which makes people lament. Apart from protective repairs, how can these cultural relics be completely preserved? The picture is intuitive but one-sided, and the video is complete but fragmented. 3D reconstruction of real scene is undoubtedly a good choice. Through the three-dimensional reconstruction technology of real scenes, cultural relics can be "permanent", and it is very important to preserve these information and materials for cultural relics protection.

Sublimation Edition: Digital Twin → Real-time Interaction → Intelligent Simulation → Metauniverse

The more advanced application is intelligent simulation, which involves many high-end technical capabilities, and has extremely high requirements for highly accurate information, confidence in real-time transmission, and spatial interaction ability. The application of this level is very scientific and technological, such as digital twin cities, industrial meta-universe, intelligent transportation and so on. In these scenes and fields, 3D reconstruction technology of real scenes is the first step to realize these great imaginations.

At that time, there may be an immersive and interactive life consumption scene, and people can socialize and shop in the virtual space based on the three-dimensional reconstruction of the real scene; Urban planning can obtain all kinds of data such as roads, traffic and weather in real time, with real-time perception of all factors, interconnection control, multi-dimensional digital expression and dynamic visualization; Based on the three-dimensional reconstruction of the real scene, the factory park can build a factory-level meta-universe platform and create a digital twin system with low delay, high fidelity and intelligent decision-making.

The application of three-dimensional reconstruction of real scene should be expounded. Actually, there are many more. The development of technology is beyond imagination. Just like in the era of using big brother, we can't imagine that smart phones will change our lifestyle like this. Maybe one day, all the imaginations will come true today. Every technological development today may be a leap-forward technological innovation in the future. Friends will wait and see ~