Method for realizing unlimited blue-box function used in virtual studio systems

Abstract

The invention relates to a television-program producing-broadcasting technique in the field of radio and television, in particular to a method for realizing unlimited blue-box function used in virtual studio systems. The method is characterized in that surface sheet structures are generated in a complementary-set region of a blue box to form a geometric body; each surface of the geometric body isa plane; every plane is taken as a mask; filled signals are background signals; when a camera is swung out of a blue-box region, the planes taken as masks are rendered in an Alpha cache; meanwhile, according to foreground, background and occlusion relation, three-dimensional objects used to occlude the foreground are extracted to be rendered in the Alpha cache; rendered images are synthesized to be video signals output to a color key through an Alpha channel; and the color key serving as a foreign key is synthesized with the background and the foreground in real time to generate video images reflecting three-dimensional effects. The method during application can fine adjust the size of blue boxes in order to be matched with different size of the blue boxes to realize final occlusion effects, thereby perfectly fusing the foreground with the background.

Description

technical field [0001] The invention relates to the production and broadcasting technology of television programs in the field of radio and television, in particular to a method for realizing the infinite blue box function used in a virtual studio system. Background technique [0002] Virtual studio is a unique TV program production technology developed in recent years. The virtual studio system obtains the foreground image by the camera, and obtains the motion parameters of the camera through the tracking system, and delays the video signal output by the camera by the delay device; the graphics workstation generates the background signal and the background signal of the three-dimensional virtual scene in real time according to the motion parameters of the camera. Mask signal: The time-delayed video signal, three-dimensional virtual scene signal and mask signal are synthesized in the image keying synthesizer and output to the video recording device. The virtual studio syste...

AI Technical Summary

Problems solved by technology

[0008] The first method needs to add an image processing card, which increases the cost and increases the system delay, which makes people feel unreal; the latter two methods need to be modeled according to the geometric size of the blue box, the position of the camera, The direction and field of view can be obtained through the camera parameter tracking system, and the area beyond the real blue box in the camera image can be calculated in real time through the obtained parameters and the model of the blue box in the computer

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