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Method based on 3D point cloud representation model

A point cloud, 3D technology, applied in the field of model representation based on 3D point cloud, can solve the problem of rough triangle model, and achieve the effect of reducing geometric error and high-quality shadow effect

Pending Publication Date: 2019-07-23
视缘(上海)智能科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

One of the disadvantages of this approach is that the triangular model can be rough, contain bumps and other types of undesirable features such as holes and tunnels, and be non-manifold

Method used

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  • Method based on 3D point cloud representation model
  • Method based on 3D point cloud representation model
  • Method based on 3D point cloud representation model

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Embodiment Construction

[0062] Below in conjunction with accompanying drawing and embodiment the present invention will be further described:

[0063] see figure 1 , a method for representing a model based on a 3D point cloud, comprising the steps of:

[0064] S1. Project the points near the point set to the surface;

[0065] S2, calculate the plane and polynomial;

[0066] S3. Perform down-sampling;

[0067] S4. Perform upsampling;

[0068] S5. Perform point rendering.

[0069] Preferably, S1 includes:

[0070] S1.1 Find the reference domain:

[0071] set point p i ∈IR 3 , i∈{1,...,N}, is the sampling point on the surface S (possibly with measurement noise), the goal is to convert the point r∈IR near the surface S 3 Projected onto a two-dimensional surface S approximately pi P Above; the following is calculated by differential geometry, that is, the surface can be locally approximated by polynomial functions;

[0072] find reference domain: find r's local reference domain (plane); local p...

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Abstract

The invention discloses a method based on a 3D point cloud representation model, which can represent the shape by reducing a point set approximate to geometric errors, can generate a high-quality shadow effect and a smooth outline, and controls the fidelity of representation. The representation method comprises the following steps: S1, projecting points near a point set to the surface; S2, calculating a plane and a polynomial; S3, carrying out up-sampling; S4, carrying out down-sampling; S5, carrying out point rendering. According to the method, the local image is evaluated according to the image resolution, and a high-quality shadow effect and a smooth contour can be generated at an interactive frame rate; by means of the proposed tool for increasing or decreasing the dot density, it is possible to adjust the spacing between the dots to control the fidelity of the representation.

Description

technical field [0001] The invention relates to the technical field of computer graphics, in particular to a method for representing models based on 3D point clouds. Background technique [0002] Point sets are receiving increasing attention as representations of models in computer graphics, one reason being the availability of affordable and accurate scanning devices that produce dense point sets, which are the initial representation of physical models; another The reason is that highly detailed surfaces require a large number of small primitives that contribute less than a pixel when displayed, so points become effective display primitives. When conveying shape, point-based representations should be as small as possible, since point sets are neither noisy nor redundant. It is important to have tools that adjust point density sufficiently so that smooth surfaces can be reconstructed well. [0003] A common approach is to generate triangular surface models on thick point s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/50G06T17/20G06T15/00
CPCG06T7/50G06T17/20G06T15/005G06T2207/10028
Inventor 骞志彦王国强张斌陈学伟
Owner 视缘(上海)智能科技有限公司
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