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A Method for Reconstructing Hemisphere's 3D Surface Shape Using Control Point Information

A 3D surface and hemisphere technology, applied in 3D modeling, image data processing, instruments, etc., can solve the problem of low accuracy of reconstructing the 3D surface shape of objects

Inactive Publication Date: 2011-12-21
SHANGHAI UNIV
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Problems solved by technology

However, although this method has a fast measurement speed, the accuracy of the three-dimensional surface shape of the reconstructed object obtained by this algorithm is not high

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  • A Method for Reconstructing Hemisphere's 3D Surface Shape Using Control Point Information
  • A Method for Reconstructing Hemisphere's 3D Surface Shape Using Control Point Information
  • A Method for Reconstructing Hemisphere's 3D Surface Shape Using Control Point Information

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Embodiment Construction

[0040] The embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings. This embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation methods are provided, but the protection scope of the present invention is not limited to the following embodiments. .

[0041] A preferred embodiment of the method for reconstructing the three-dimensional surface shape of a hemisphere using control point information of the present invention is described in detail in conjunction with the accompanying drawings as follows: figure 1 As shown, the specific steps are as follows:

[0042] (1) Construct a standard hemispherical model and set up the image surface irradiance equation

[0043] The prerequisite for obtaining the three-dimensional surface shape of an object is the solution of the hemispherical irradiance equation. The method to obtain the surface irradiance equatio...

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Abstract

The invention discloses a method for reconstructing the three-dimensional surface shape of a hemisphere by using control point information. The method first constructs a standard hemisphere model, obtains three gray images of the hemisphere from three angles, and establishes an object surface irradiance equation; Then use the object surface irradiance equation and the photometric stereo method to uniquely determine the direction gradient of the object surface, and perform variational processing to reconstruct the three-dimensional surface f1(x, y) of the hemisphere from the direction gradient; finally use the interpolation surface algorithm and the hemisphere The 3D information of the surface control points is used to obtain the interpolation surface f2(x, y), and the linear superposition of f1(x, y) and f2(x, y) is used to obtain the 3D information of each point on the surface of the object, and then the reconstructed 3D surface of the object is obtained f3(x, y). The method not only measures the three-dimensional surface shape of the spherical object quickly, but also has high precision in the measured three-dimensional surface shape of the reconstructed hemisphere. Experimental results show that the average relative error of the reconstructed three-dimensional surface of the hemisphere is reduced by about 1.3%.

Description

technical field [0001] The invention belongs to the technical field of three-dimensional surface measurement of objects, and in particular relates to a method for reconstructing the three-dimensional surface shape of a hemisphere by using control point information, which provides a theoretical basis and application space for the accurate reconstruction of a three-dimensional model of a real object. Background technique [0002] In order to meet the needs of industrial inspection, reverse engineering and multimedia 3D modeling, obtaining accurate information of the 3D surface of objects has become one of the hot research issues in recent years. However, how to make the reconstructed three-dimensional surface of the object infinitely close to the surface of the standard object has not yet been well solved. [0003] At present, the three-dimensional surface reconstruction methods of objects are distinguished according to whether they are contacted or not, and are mainly divided...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T17/10
Inventor 张栋吕东辉
Owner SHANGHAI UNIV
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