Three-dimensional model projecting method and device for imitating lens distortion

A 3D model, lens distortion technology, applied in the generation of 2D images, components of color TVs, components of TV systems, etc., can solve problems such as lack of realism and uncoordinated scenes

Inactive Publication Date: 2011-06-29
CHINA DIGITAL VIDEO BEIJING
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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

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  • Three-dimensional model projecting method and device for imitating lens distortion
  • Three-dimensional model projecting method and device for imitating lens distortion
  • Three-dimensional model projecting method and device for imitating lens distortion

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[0053] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0054] One of the core concepts of the embodiments of the present invention is that, due to lens distortion, during the process of projecting a virtual three-dimensional model into a two-dimensional image, it often appears inconsistent with the scene in the image and lacks a sense of reality. Therefore, the inventor of this patent introduces the distortion coefficient to describe the distortion effect of the lens, and applies the coefficient to the projection process to distort the 3D model to match the scene in the image.

[0055] It is known that there are mainly two kinds of lens distortions, one is radial distortion and the other is tangential distortion. Tangential distortion is very small, so in this invention, we only consi...

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Abstract

The invention discloses a three-dimensional model projecting method for imitating lens distortion. The method comprises steps as follows: projecting the three-dimensional model onto an image plane according to a pin-hole imaging model, and obtaining an image coordinates (u, v) under an image coordinate system; obtaining a transformation relation of the image coordinates and computing a normalized image coordinates (x, y) under a camera coordinate system corresponding to the image coordinates (u, v) according to the transformation relation; and computing the distorted normalized image coordinates according to the normalized image coordinates (x, y) and projecting the distorted normalized image coordinates to the image plane, and overlaying the three-dimensional model by the distorted image coordinates on a real two-dimension image after the three-dimension model is protected on the image coordinates. The invention matches the three-dimension model and a real scene, so as to realize a more real and natural false-real combination.

Description

technical field [0001] The invention relates to the technical field of television program production, in particular to a three-dimensional model projection method for simulating lens distortion and a three-dimensional model projection device for simulating lens distortion. 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...

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Application Information

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IPC IPC(8): G06T11/00G06T7/00H04N5/262
Inventor 谢宏
Owner CHINA DIGITAL VIDEO BEIJING
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