Three-dimensional model projection method and device in virtual studio system

Abstract

The invention discloses a method for projecting a three-dimensional model in a virtual studio system, which comprises the following steps of: projecting the three-dimensional model to an image plane according to a pinhole imaging model to obtain an image coordinate (u, v) under an image coordinate system; acquiring a transformation relation of the image coordinate, and calculating a normalized image coordinate (x, y) under a coordinate system of a camera corresponding to the image coordinate (u, v) according to the transformation relation; constructing a radial distortion model of a current image; substituting the normalized image coordinate (x, y) into the radial distortion model to obtain a distorted image coordinate; projecting the three-dimensional model to the distorted image coordinate; and superposing the three-dimensional model into a real two-dimensional image. By the method provided by the invention, the three-dimensional model can be matched with a real scene in the image, so that more real and more natural virtual-real combination is realized.

Description

technical field [0001] The invention relates to the technical field of television program production, in particular to a three-dimensional model projection method in a virtual studio system and a three-dimensional model projection device in the virtual studio system. Background technique [0002] Virtual studio is a unique TV program production technology developed in recent years. Its essence is to digitally synthesize the virtual 3D model made by the computer and the moving images of the objects captured by the camera in real time, so that the object images and the virtual background can change synchronously, so as to achieve the fusion of the two to obtain a perfect composite picture. The virtual studio technology is based on the traditional chroma keying technology, making full use of computer 3D graphics technology and video synthesis technology, according to the position and parameters of the camera, so that the perspective relationship of the 3D virtual scene is consi...

AI Technical Summary

Problems solved by technology

[0004] However, in fact, the real lens is not an ideal pinhole imaging model, and often has small distortions, such as figure 1 As shown, the real lens tends to project the straight line in the real scene into a curved curve on the image

At this time, if the virtual 3D model is directly projected onto the image, the straight line will still be a straight line, which will appear inconsistent with the scene in the image and lack the sense of reality

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