The giant “snowflake” main torch platform, more than 10000 square meters of light and shadow ground screen, 60 meter high ice waterfall screen, three-dimensional motion tracking technology… With the help of electronic information technology and products, Beijing has presented the world with an audio-visual feast integrating a sense of science and technology, experience and aesthetics. The perfect presentation of this magnificent opening ceremony is inseparable from the “great help” of scientific and technological innovation such as LED screen, ultra-high definition video and three-dimensional simulation technology.
Wanping giant light and shadow ground screen occupies position C
The large number of applications of photoelectric display products created a brilliant opening ceremony. Among them, the ground screen of the opening ceremony constantly changes the picture with the progress of the program, sometimes delicate and sometimes empty, occupying the absolute C position. Wang zhiou, visual effect director of the opening ceremony, praised him in an interview: “now this land screen has become the largest ‘ice surface’ in the history of the Olympic Games and one of the biggest highlights of the opening ceremony, showing the rapid development of China’s science and technology and performing arts technology.”
According to the reporter, the overall area of the stage floor of the opening ceremony is more than 10000 square meters. It is the largest 8K ultra-high definition ground display system in the world. It adopts multiple picture fusion technology with 8K + resolution. The super large-scale optical correction algorithm can carry out pixel level optical correction for each display picture, and can achieve 100000:1 ultra-high contrast and 3840hz ultra-high refresh rate, And 29900×15096 ultra-high resolution Ultra HD gorgeous pictures. In the high-intensity rehearsal for five months and the extremely low temperature rain and snow weather of minus 30 ℃ in winter, the ground display system can still realize stable operation, and perfectly present the dreamy and realistic beauty of science and technology to the world on the day of the opening ceremony.
The giant “snowflake” shaped main torch platform is shining
Practicing the concept of low carbon and environmental protection, the Beijing Winter Olympic Games innovatively adopted the Olympic torch to replace the lighting ceremony of the main torch. When the two athletes put the Olympic torch into the main torch platform in the form of snowflakes, the giant snowflake screen radiated from the center to all around, shining a wave like layer by layer bright light and changing rapidly. The giant snowflake shaped main torch platform glowed with crystal clear light and slowly lifted off, pushing the atmosphere of the whole opening ceremony to a climax.
The reporter learned that the diameter of “snowflake” is 14.89 meters. It is composed of 96 small snowflakes and 6 LED double-sided screens in the form of olive branches. It adopts double-sided hollow design and is embedded with more than 550000 LED light beads. Each light bead is independently controlled by a single channel of the driving chip.
It is reported that the hardware support and software system of the main flare platform are independently developed and designed by BOE (BOE). Through more than 500 design drawings and nearly 10 rounds of sample preparation, the team members have developed the single pixel controllable special-shaped display product with the narrowest luminous surface in the industry, which fully presents the line feeling and delicate picture display effect of snowflakes, and successfully turns the artistic creativity of the director group into reality.
Ice cube “carves” the five ice and snow rings vividly
In the “five ice and snow rings” chapter of the opening ceremony, the five ice and snow rings carved from the “ice cube” are impressive. The 43 second combination of virtual and real performance of ice cube ice breaking condenses the scientific and technological wisdom of hundreds of people.
Beijing Long March Tianmin special team explained that the design team reduced the physical production cost in the design process of the five ring display environment by using three-dimensional virtual design, rendering and comparison of performance visual effects, and semi physical simulation technology. It is reported that the structural characteristics of the five rings are special-shaped, long-span and low stiffness. Its design is similar to that of rocket development. Referring to some methods of aerospace structure design, the Tianmin of the long march takes the aluminum alloy truss structure as the skeleton, the LED display screen as the clothes and the diffuser as the coat, so that the five Olympic rings are as strong and light as the arrow body of the rocket.
“The vision of ‘carving’ is produced by the combination of laser and ice cube 3D visual effect.” The opening ceremony was introduced by Li Jun, chairman of LED supplier Leyard Optoelectronic Co.Ltd(300296) group. The ice cube is 22 meters long, 7 meters wide and 10 meters high. It is composed of LED screens. When the Olympic rings were unveiled, the laser on the 4th floor of the stand shone on the ice cube to “carve” the ice cube. With the top cover of the ice cube turning down and cooperating with the laser “carving”, the five rings at the bottom rose slowly, and the LED screens on the four sides of the ice cube fell slowly while playing the three-dimensional visual effect of ice debris splashing. The three aspects are perfectly matched, It forms the visual effect that the five rings are “carved” a little.
Virtual simulation system is the invisible hero behind the scenes
As a complex system project, the opening ceremony of the Winter Olympic Games has set up 16 links, involving about 3000 actors, more than 30000 staff and spectators. In order to ensure the smooth progress of the Winter Olympics and the perfect presentation of the performance effect, the digital performance and simulation technology team of the school of computer science of Beijing University of technology has created a simulation system for the opening ceremony of the Winter Olympics based on the original “intelligent creation, editing and rehearsal integration” system.
“Through three-dimensional simulation technology, we simulate the whole process of the opening ceremony of the Winter Olympic Games, and carry out an all-round ‘troop arrangement’ for all elements such as actors, lights, music, fireworks, the Olympic torch and even broadcasting slots. This platform is equivalent to a film rehearsal system to help the director team intuitively understand the overall effect of the opening ceremony.” Professor Ding Gangyi, head of digital performance and simulation technology team and Beijing Institute of technology, said.
The opening ceremony system simulation has been accurate to every minute of the opening ceremony, and even to the position and pace of each actor. For example, the members of the team of Beijing University of technology simulated the action effects of each actor in the program “beginning of spring” one by one, provided each performer with a “customized” performance manual, clearly marked the program details one by one, and modified the program effects tens of thousands of times to help the program present the best effect.
It is reported that before the grand opening ceremony on February 4, the opening ceremony has been rehearsed on the simulation system for about 12 times. The simulation system of the opening ceremony of the Winter Olympics provides strong scientific and technological support for the planning, design and rehearsal of the opening ceremony.
3D motion tracking technology ensures performance 0 errors
With music, the athletes “swim” in the ice and snow, and the ice and snow melt instantly wherever they go. The wind and snow special effects seem to be integrated with the athletes. The spectacular scene of the “snowflake” performance at the opening ceremony amazed audiences all over the world.
With the help of AI algorithm and 3dat three-dimensional athlete tracking technology, the opening ceremony covered the whole audience with only four cameras, realized the real-time interaction between actors and the large screen laid on the scene, and transmitted the aesthetic art and Olympic spirit to the world.
\u3000\u3000 “At present, the technologies related to optical dynamic capture or inertial dynamic capture have been relatively mature, and many companies outside China are providing relevant commercial services. However, the human body dynamic capture technology based on computer vision is still in the stage of academic research, and there are few commercial products related to it in the market. The existing visual dynamic capture technology also has the problems of low accuracy and spatial uncertainty of human body attitude tracking Unstable position, prone to abnormal posture results and other problems. ” Intel’s R & D personnel told the reporter of China Electronics News.
It is understood that in order to achieve the “Changyou” special effect 0 error and improve the real-time data signal transmission and transmission efficiency, the Intel team has overcome many difficulties. For example, when designing the algorithm, we should try our best to avoid the output of wrong posture or unreasonable posture, and use the video motion information of the front and back frames to increase the temporal and spatial consistency and reduce the timing jitter. In video images and three-dimensional data, we should refer to the relevant knowledge of human motion to make the AI model have the reasoning ability from image to three-dimensional space. Finally, the powerful error correction ability of the algorithm is used to constrain the information from the aspects of embedded human kinematics and dynamics, so as to ensure the accuracy of the final output human motion information.
In addition, the reporter learned that in addition to the appearance in the opening ceremony, 3dat technology is also used in athletes’ training, competition, post game analysis and other applications. For example, 3dat solution can send motion video data to the cloud at the speed of 60 frames per second, process, verify, count and analyze complex and huge training data information in real time in several seconds, generate motion trajectory and athlete bone analysis reports and charts, and provide a detailed overview for athlete training and coach guidance, Help athletes unleash their full athletic potential.
