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Output method of two-dimensional (2D) projection of three-dimensional (3D) model based on spherical harmonic transform

A three-dimensional model, spherical harmonic transformation technology, applied in the processing of 3D images, image data processing, instruments, etc., can solve problems such as different visual images

Inactive Publication Date: 2013-11-06
NANJING UNIV
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Problems solved by technology

The visual images obtained by these two projection methods are often used in the 3D model vision-based retrieval method, but these two projection methods have a common disadvantage: different projection angles will result in different visual images

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  • Output method of two-dimensional (2D) projection of three-dimensional (3D) model based on spherical harmonic transform
  • Output method of two-dimensional (2D) projection of three-dimensional (3D) model based on spherical harmonic transform
  • Output method of two-dimensional (2D) projection of three-dimensional (3D) model based on spherical harmonic transform

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Embodiment Construction

[0068] The output method of a two-dimensional projection of a three-dimensional model based on spherical harmonic transformation according to the present invention, its basic starting point is to obtain the projected spherical harmonic characteristics under the action of the conversion factor through the spherical harmonic characteristics of the three-dimensional model, and then, Through coordinate inverse mapping, the information of the two-dimensional projection image is obtained.

[0069] Below in conjunction with accompanying drawing, the present invention is explained in more detail:

[0070] Such as figure 1 Shown, the present invention comprises the following steps:

[0071] Step 1. Input the 3D model to be projected. The input 3D model consists of a set of triangular patches. The geometric information extracted from the 3D model includes which three vertices each triangular patch consists of, and the geometry of each vertex. coordinate.

[0072] Step 2, calculating ...

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Abstract

The invention discloses an output method of two-dimensional (2D) projection of a three-dimensional (3D) model based on spherical harmonic transform. The output method comprises the following steps of: 1. inputting the 3D model to be projected; 2. calculating barycentric coordinates of the 3D model, and then normalizing the 3D model; 3. carrying out layering sampling on the 3D model; 4. calculating the spherical harmonic characteristic of the 3D model by a Monte Carlo integration method, and calculating conversion factors based on sampling points; 5. calculating the 2D spherical harmonic characteristic after projection according to the conversion factors and the spherical harmonic characteristics of the 3D model; and 6. calculating the 2D information after projection according to the 2D spherical harmonic characteristic.

Description

technical field [0001] The invention relates to a method for projecting a three-dimensional model, in particular to a method for outputting a two-dimensional projection of the three-dimensional model by using a spherical harmonic transformation method for a three-dimensional model containing only geometric information. Background technique [0002] Now, the 3D model has been widely used in computer animation, games, virtual reality, etc. At the same time, the projection of the 3D model represents the visual image of the 3D model, and is also widely used in various fields. [0003] The currently existing 3D model projection methods are parallel projection and perspective projection, both of which are calculation methods of geometric projection. The projection rays of perspective projection are all emitted from a common point, and parallel projection is a special case of perspective projection. The visual images obtained by these two projection methods are often used in the v...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T15/00
Inventor 路通高荣军
Owner NANJING UNIV
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