On virtual studio technology in program production application
Of: Li Lei Ming Jin Fang's total work force What is a virtual studio
Since its launch television since television host behind the scenes is always simple and monotone colors. The Virtual structures usually wood, cardboard and paint and other materials. Over time, the program is to provide viewers with richer visuals become more important, which requires the early breakthrough the limitations of the traditional way of making the scene. Key technology is the first breakthrough in technology, in black and white TV era, key technologies used is light, then with the color of television, there has been color key technology and applied. Through key technology, prospects in the image can be a part of the computer a static image replacement, can also be pre-recorded video, live video, or any other video source as an alternative.
Rich program, but to achieve results, only to rely on bright key or color key technology is not enough?? Because the camera movement in the shooting, the prospects for composite video output signal and background signal is not synchronized between the change in the relationship. The prospect of cameras filming took place hosts push, pull, shake, move and other sports, the audience will find background immediately obvious false phenomenon.
The birth of virtual studio technology is used to solve the program take a simple color key keying many restrictions exist. Virtual studio technology in the traditional Chroma Key technology based on the three-dimensional graphics using computer and video synthesis, according to the location of future camera parameters focal length, so three-dimensional virtual scene rendering consistent relationship and prospects, through color key After synthesis, makes the prospects of people props look completely immersed in a computer generated three-dimensional virtual scene to create realistic, three-dimensional effect of a strong studio. Virtual studio technology is key technology in the color of a progress, but the progress is enormous.
Virtual studio works Virtual studio is a set of computer software, host, live cameras, video cameras, trackers, graphics image generator, color key players and video / audio switcher system consisting of programming. The world there are dozens of companies have developed or are developing this new television production systems. Such as the U.S. E & & S's Minset, Canada, Discreet, Logic's Vapour and Israeli RT-SET's Larus virtual studio systems, addition, Accom, BBC, Trinity, ORAD, Radamec and other companies have a virtual studio system available. Although the hardware configuration and software design companies is different, but it works basically the same, the main work flow is as follows:
1, Blue Virtual scene Different virtual studio with traditional studio, it is computer animation, "virtual" Virtual props out of the scene to replace the main features. The cameras at the scene is not an ordinary sense of the activities of the local host or actress, but the application of the virtual screen space, part of its practical significance only venue of its size the size of the space. All set the scene all the blue is replaced by a single, as a future benchmark for color keying. The prospect of the image is different flight camera captured images of the host material. Virtual host site where all the blue area will be synthesized into a computer generated three-dimensional animated virtual scenes.
Artificial structures with traditional stage or studio space compared to the virtual three-dimensional scene used in the studio can be said that a revolution in studio technology. Not only greatly reduce the production cost, shorten production cycles, more importantly, the virtual scene can easily change the characteristics of a great creative director to meet the need.
To note that the use of real live virtual studio though reduced to a single blue, but it is not anything not necessary. If the program to show host came down the stairs, then the site must also set the number of block painted blue geometric objects as "stairs" to the stairs and the computer generated match.
2, Virtual Studio Special Camera Number of special cameras usually one to three. Virtual studio dedicated camera is different from traditional cameras, in addition to the lens and head outside, virtual studio with the camera with motion detection and identification system that the camera tracker. The tracking methods are the optical recognition system and mechanical sensing systems of two. To E & & S Corporation Minset200 mechanical sensor systems, for example, the principle is to detect the camera's push, pull, shake, move, focus, zoom and even parts of the campaign platforms, such as sensor data, through a known the "sensor" devices to 9 core cable to the same core interface with 9 known as the "calibrator" data correction device. The device will be calibrated data transmission via RS-422 interfaces to a computer, so that the camera and the virtual studio scene in the "virtual" camera is relatively locked in one location. When a studio camera motion, the virtual camera can be controlled by the tracker in real time to keep pace with the live camera. RT-SET Larus system, each camera companies need a support for SGI's ONYX Graphics workstations, each camera can be controlled through the system.
3, computer parts Virtual studio system with the existing computer system platform based on PC, WindowsNT, Unix-based systems also have the graphics workstation. It is like a small computer network, the host for the network center, which is the control center of the virtual studio, virtual studio program production of "director of Taiwan." In addition to calls and adjust its three-dimensional virtual scene well in advance, but also to the pattern generator is responsible for transmission and processing of image data transmitted by the camera tracker camera motion data. Here, play an important role in pattern generator. It came under the host in real-time camera movement data to calculate the virtual three-dimensional computer scenes campaign to ensure that the output of the virtual and the real prospect of background synchronization. Note that some graphics generator operations need a few frames or so, so, camera must have a picture of the same number of frames of delay, so as to ensure that the real scenario consistent with the virtual scene.
Virtual studio application of ways and means to
Only on the virtual studio system has a profound understanding to fully play its advantages in program production. First, we should understand what it can do, how do results come out like. There is an English
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