Prefabricated part plane round hole extraction method based on point cloud data

A point cloud data, prefabricated component technology, applied in image data processing, measuring devices, instruments, etc., can solve the problems of artificial hole detection and reverse modeling subjectivity error, excessive labor consumption, etc., to reduce the reverse construction of circular holes. The effect of the moulding process

Active Publication Date: 2019-07-30
CHONGQING UNIV IND TECH RES INST
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Problems solved by technology

However, the above methods all require a lot of manual operations to determine the position and size of the circular hole
[0004] Therefore, in order to avoid the subjective errors that are prone to occur in artificial hole detection and reverse modeling when the data scale is large, as well as the problem of excessive labor consumption, it is urgent to develop a method for extracting plane circular holes.

Method used

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  • Prefabricated part plane round hole extraction method based on point cloud data
  • Prefabricated part plane round hole extraction method based on point cloud data
  • Prefabricated part plane round hole extraction method based on point cloud data

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Embodiment 1

[0034] see figure 1 , this embodiment discloses a method for extracting plane round holes of prefabricated components based on point cloud data, comprising the following steps:

[0035] 1) Input the point cloud data of the plane with round holes in the prefabricated components.

[0036] 2) Process the point cloud data input in step 1) with an edge extraction algorithm to obtain a list of edge points including inner edges and outer edges.

[0037] 2.1) Calculate a certain number of nearest neighbor points for each point.

[0038] 2.2) If figure 2 As shown, take each point as the center, divide its neighborhood into eight equal angles, and judge whether all of the eight areas fall into the nearest neighbor of the point, if not, mark the point as an edge point. In particular, by controlling the number of nearest neighbors, different classes of edge points can be obtained. see Figure 4 , according to the number of point clouds in the specific implementation example, when ed...

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Abstract

The invention provides a prefabricated part plane round hole extraction method based on point cloud data. The method comprises the steps of inputting point cloud data, acquiring a list of edge points,fitting a round hole, correcting the radius of the round hole and the like. The method is advantageous in that the reverse modeling of the round hole of the prefabricated part is used to effectivelyreduce a large amount of human intervention in the traditional reverse modeling work, and technical support is provided for the non-contact detection and the round hole reverse modeling of the prefabricated part.

Description

technical field [0001] The invention relates to the field of building management and information technology, in particular to a method for extracting plane round holes of prefabricated components based on point cloud data. Background technique [0002] Three-dimensional laser scanning technology is a high-tech that began to appear in the mid-1990s, and it is another breakthrough in surveying and mapping technology after the GPS space positioning system. It obtains the three-dimensional coordinates of the surface of the measured object and the reflectivity of the surface of the measured object quickly and with large area and high resolution through the method of high-speed laser scanning measurement. It can quickly and massively collect spatial point information, providing a new technical means for establishing a 3D image model of an object. Because of its rapidity, non-contact, real-time, dynamic, active, high-density, high-precision, digitization, automation and other char...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/12G01B11/00G06T7/00G06T7/13G06T7/168G06T7/62G06T7/64
CPCG01B11/00G01B11/12G06T7/0004G06T2207/20061G06T2207/30164G06T7/13G06T7/168G06T7/62G06T7/64
Inventor 李东声冯亮刘界鹏周扬
Owner CHONGQING UNIV IND TECH RES INST
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