Complex geometry image representation method for point cloud curve surface

A technology of geometric images and surfaces, which is applied in the field of composite geometric image representation of point cloud surfaces and can solve problems affecting model storage and network transmission.

Inactive Publication Date: 2015-04-01
WENZHOU UNIVERSITY
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Problems solved by technology

One of the very urgent problems is: the denser the surface of the point cloud, the more accurate the physical model can be represented. Howeve

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  • Complex geometry image representation method for point cloud curve surface
  • Complex geometry image representation method for point cloud curve surface
  • Complex geometry image representation method for point cloud curve surface

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Embodiment Construction

[0036] In the image processing process of the following embodiments, the Cartesian coordinates [x, y, z] of any point in the point cloud surface are first converted into spherical coordinates To realize spherical coordinate transformation, it is first necessary to determine the coordinate origin of the spherical coordinate system. Select the geometric center of the point cloud surface as the coordinate origin, denoted as O. Such as figure 1 shown.

[0037] exist Among them, r is the distance from a point P to the origin O in space, is the angle obtained from the positive rotation of the x-axis on the xy plane, Also called the azimuth angle, the range is [0,2π]. On the zy plane, θ is the angle obtained from the positive rotation of the z-axis, and θ is also called the polar angle, and the range is [0,π]. Scan all the points in the point cloud surface, you can get r∈[r min ,r max ], θ∈[θ min ,θ max ].

[0038] The resulting spherical coordinates After that, map ...

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Abstract

The invention provides a complex geometry image representation method for a point cloud curve surface. Surface attribute information and geometry information of the point cloud curve surface are mapped into a two-dimension image through a spherical polar coordinate. According to the method, firstly, the Cartesian coordinates [x, y, z] are converted into the spherical polar coordinates [gamma, phi, theta] through the spherical coordinate. Two quantities in the coordinates [gamma, phi, theta] are respectively converted into pixel coordinates, and the other one coordinate is converted into a gray value of the pixel, so that three different geometry images gamma (phi, theta), theta (gamma, phi) and phi (gamma, theta) can be obtained. The geometry information loss can be caused when any one image in the three images is used for representing the point cloud curve surface, so that the complex geometry image representation method for the point cloud curve surface provided by the invention integrally uses the three image conversion modes, and the efficient and precise representation on the point cloud curve surface can be realized. When the method is used, the compression, the editing, the simplification, the model retrieval, the progressive transmission and the like on the point cloud curve surface can be easily realized.

Description

technical field [0001] The invention relates to a composite geometric image representation method of a point cloud surface. Background technique [0002] First of all, the point cloud surface is the initial representation of the physical model after the digitization process of the scanning device. Points are used as a basic primitive to construct the surface. In terms of surface display, it is easy to implement through hardware to improve the display speed. Secondly, point cloud surfaces can represent objects with complex structures, which is difficult for analytic free-form surface representations. These reasons have prompted people to turn more attention to point cloud representation models. [0003] Point cloud surfaces can describe the surface details of 3D models, and can represent objects and scenes with high complexity and high realism. Many models in the real world such as sculpture models, machine parts, archaeological models, and terrain features can be represente...

Claims

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Application Information

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IPC IPC(8): G06T3/00
CPCG06T3/0037
Inventor 陈宁华叶修梓洪振杰张三元
Owner WENZHOU UNIVERSITY
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