CN107782251B - Method for improving building three-dimensional scanning definition by using auxiliary marker - Google Patents
Method for improving building three-dimensional scanning definition by using auxiliary marker Download PDFInfo
- Publication number
- CN107782251B CN107782251B CN201610757545.6A CN201610757545A CN107782251B CN 107782251 B CN107782251 B CN 107782251B CN 201610757545 A CN201610757545 A CN 201610757545A CN 107782251 B CN107782251 B CN 107782251B
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- China
- Prior art keywords
- boundary
- point cloud
- cloud intensity
- improving
- sticker
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Links
- 238000000034 method Methods 0.000 title claims abstract description 15
- 239000003550 marker Substances 0.000 title abstract description 5
- 238000002310 reflectometry Methods 0.000 claims abstract description 7
- 230000001965 increasing effect Effects 0.000 claims abstract description 6
- 239000002390 adhesive tape Substances 0.000 claims description 6
- 239000004744 fabric Substances 0.000 claims description 6
- 239000003086 colorant Substances 0.000 claims description 3
- 230000002708 enhancing effect Effects 0.000 claims description 3
- 230000003313 weakening effect Effects 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 abstract description 4
- 239000010959 steel Substances 0.000 abstract description 4
- 230000000694 effects Effects 0.000 description 4
- 238000000889 atomisation Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 2
- 230000003746 surface roughness Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
the invention relates to a method for improving the three-dimensional scanning definition of a building by using an auxiliary marker; the method is characterized in that: comprising determining whether a boundary of the member to be scanned is an outer boundary or an inner boundary; pasting a reflective strip; for the outer boundary, a reflective sticker with high reflectivity is pasted along the outer boundary ring, so that the point cloud intensity of the sticker position is improved; for the inner boundary, a reflective target capable of forming mirror reflection is pasted on the back of the bolt hole, so that the point cloud intensity of the target position is reduced; the component is scanned, and the point cloud intensity of the surface is enhanced or weakened, so that the point cloud intensity contrast of two sides of the boundary is increased, and the boundary identification capability is improved. The operation method improves the scanning precision of the building steel structure pre-assembly field and even other three-dimensional scanning fields by using the auxiliary marking tool.
Description
Technical Field
The invention relates to the field of building structure measurement, in particular to a method for improving building three-dimensional scanning definition by using auxiliary markers.
Background
the three-dimensional scanning is affected by the uneven reflection characteristics of the surface of the scanned object, the higher the reflectivity is, the stronger the laser echo signal is, and the greater the intensity of the scanned point cloud is, otherwise, the smaller the intensity of the point cloud is. The point cloud identification is carried out by comparing the point cloud intensities of two sides of the boundary, the boundary is easy to identify the larger the comparison of the point cloud intensities of the boundary is, and the boundary is not easy to identify if the comparison of the point cloud intensities of the two sides is not obvious.
In the three-dimensional scanning process of a building steel structure, the scanning boundary point cloud and the point cloud atomization phenomenon of the bolt holes are serious at the interface and the bolt holes due to the influence of factors such as scanning distance, scanning angle and steel surface roughness, and the identification of the boundary in the later-stage point cloud processing process is greatly influenced.
Disclosure of Invention
The invention aims to provide an operation method capable of effectively improving the identification capability of a steel structure in three-dimensional scanning.
In order to achieve the above object, the present invention is realized by:
A method for improving the three-dimensional scanning definition of a building by using auxiliary markers comprises
step 1, determining whether the boundary of a component needing to be scanned is an external boundary or an internal boundary;
Step 2, pasting the reflective strips;
2.1, pasting a reflective sticker with high reflectivity along the boundary outer ring for the outer boundary, and improving the point cloud intensity of the sticker position; meanwhile, for the surface of a component with low light reflection rate and smooth surface, a light reflection sticker is pasted on the whole scanning surface, so that the point cloud intensity of the whole surface is improved;
2.2, adhering a reflective target capable of forming mirror reflection to the back of the bolt hole at the inner boundary, and reducing the point cloud intensity of the target position;
And 3, scanning the component, and increasing the point cloud intensity contrast at two sides of the boundary by enhancing or weakening the point cloud intensity of the surface, thereby improving the boundary identification capability.
According to the method for improving the three-dimensional scanning definition of the building by using the auxiliary marker, the light reflecting strips are cloth-based adhesive tapes, and the cloth-based adhesive tapes with different colors are selected according to different light sources.
Laser ranging determines the measurement value by capturing enough reflected energy for the first time, and the reflected energy is largely related to the surface characteristics of the target and the included angle between the surface normal and the incident laser, so that the three-dimensional scanner has difficulty in obtaining point cloud data for a smooth specular surface. The invention fully utilizes the characteristic, adopts and sticks the reflective target to the components with strict boundary requirements, particularly the bolt holes, the positioning holes and the like, reduces the point cloud intensity of the holes, enhances the point cloud intensity comparison of two sides of the hole boundary and improves the identification capability of the hole boundary. For a smooth surface, such as a mirror surface object or a polished interface part, a strip with high color saturation can be pasted, the reflectivity is enhanced, the mirror reflection is reduced, point cloud data with high intensity is obtained through diffuse reflection of a three-dimensional laser scanner light beam, and the generation of an atomization effect is greatly reduced; the circle of the light emitting sticker is convenient to paste outside the scanned object, the point cloud intensity of the position of the sticker is enhanced, the point cloud intensity contrast of the two sides of the outer boundary is increased, and therefore the identification capability of the outer boundary is improved.
drawings
Fig. 1 is a graph comparing the inner boundary scanning effect.
Fig. 2 is a comparison graph of the effect of outer boundary scanning.
Detailed Description
The invention is further illustrated by the following specific examples.
A method for improving the three-dimensional scanning definition of a building by using auxiliary markers comprises
Step 1, determining whether the boundary of a component needing to be scanned is an external boundary or an internal boundary;
Step 2, pasting the reflective strips;
2.1, pasting a reflective sticker with high reflectivity along the boundary outer ring for the outer boundary, and improving the point cloud intensity of the sticker position; meanwhile, for the surface of a component with low light reflection rate and smooth surface, a light reflection sticker is pasted on the whole scanning surface, so that the point cloud intensity of the whole surface is improved;
2.2, adhering a reflective target capable of forming mirror reflection to the back of the bolt hole at the inner boundary, and reducing the point cloud intensity of the target position;
And 3, scanning the component, and increasing the point cloud intensity contrast at two sides of the boundary by enhancing or weakening the point cloud intensity of the surface, thereby improving the boundary identification capability.
according to the method for improving the three-dimensional scanning definition of the building by using the auxiliary marker, the light reflecting strips are cloth-based adhesive tapes, and the cloth-based adhesive tapes with different colors are selected according to different light sources.
As shown in fig. 1 and 2, the laser ranging is to acquire enough reflected energy for the first time to determine the measured value, and the reflected energy is largely related to the surface characteristics of the target and the included angle between the surface normal and the incident laser, so that the three-dimensional scanner has difficulty in obtaining point cloud data for a smooth specular surface. The invention fully utilizes the characteristic, adopts and sticks the reflective target to the components with strict boundary requirements, particularly the bolt holes, the positioning holes and the like, reduces the point cloud intensity of the holes, enhances the point cloud intensity comparison of two sides of the hole boundary and improves the identification capability of the hole boundary. For a smooth surface, such as a mirror surface object or a polished interface part, a strip with high color saturation can be pasted, the reflectivity is enhanced, the mirror reflection is reduced, point cloud data with high intensity is obtained through diffuse reflection of a three-dimensional laser scanner light beam, and the generation of an atomization effect is greatly reduced; the circle of the light emitting sticker is convenient to paste outside the scanned object, the point cloud intensity of the position of the sticker is enhanced, the point cloud intensity contrast of the two sides of the outer boundary is increased, and therefore the identification capability of the outer boundary is improved.
Claims (2)
1. a method for improving the three-dimensional scanning definition of a building by using auxiliary markers is characterized by comprising the following steps: comprises that
Step 1, determining whether the boundary of a component needing to be scanned is an external boundary or an internal boundary;
Step 2, pasting the reflective strips;
2.1, pasting a reflective sticker with high reflectivity along an outer ring of the boundary for the outer boundary, and improving the point cloud intensity of the position of the sticker; meanwhile, for the surface of a component with low light reflection rate and smooth surface, a light reflection sticker is pasted on the whole scanning surface, so that the point cloud intensity of the whole surface is improved;
2.2, pasting a reflective target capable of forming mirror reflection on the inner boundary, and reducing the point cloud intensity of the target position;
and 3, scanning the component, and increasing the point cloud intensity contrast at two sides of the boundary by enhancing or weakening the point cloud intensity of the surface, thereby improving the boundary identification capability.
2. the method for improving the three-dimensional scanning resolution of a building using auxiliary markers as claimed in claim 1, wherein: the light reflecting strips are cloth-based adhesive tapes, and the cloth-based adhesive tapes with different colors are selected according to different light sources.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610757545.6A CN107782251B (en) | 2016-08-30 | 2016-08-30 | Method for improving building three-dimensional scanning definition by using auxiliary marker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610757545.6A CN107782251B (en) | 2016-08-30 | 2016-08-30 | Method for improving building three-dimensional scanning definition by using auxiliary marker |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107782251A CN107782251A (en) | 2018-03-09 |
| CN107782251B true CN107782251B (en) | 2019-12-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610757545.6A Expired - Fee Related CN107782251B (en) | 2016-08-30 | 2016-08-30 | Method for improving building three-dimensional scanning definition by using auxiliary marker |
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| Country | Link |
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| CN (1) | CN107782251B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101246595A (en) * | 2008-02-01 | 2008-08-20 | 黑龙江科技学院 | Multi-view point data splitting method of optical three-dimensional scanning system |
| WO2016039864A1 (en) * | 2014-09-10 | 2016-03-17 | Faro Technologies, Inc. | A device and method for optically scanning and measuring an environment |
| CN105627950A (en) * | 2016-03-17 | 2016-06-01 | 沈阳飞机工业（集团）有限公司 | Optical scanning aviation tool edge line detection method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9940727B2 (en) * | 2014-06-19 | 2018-04-10 | University Of Southern California | Three-dimensional modeling from wide baseline range scans |
-
2016
- 2016-08-30 CN CN201610757545.6A patent/CN107782251B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101246595A (en) * | 2008-02-01 | 2008-08-20 | 黑龙江科技学院 | Multi-view point data splitting method of optical three-dimensional scanning system |
| WO2016039864A1 (en) * | 2014-09-10 | 2016-03-17 | Faro Technologies, Inc. | A device and method for optically scanning and measuring an environment |
| CN105627950A (en) * | 2016-03-17 | 2016-06-01 | 沈阳飞机工业（集团）有限公司 | Optical scanning aviation tool edge line detection method |
Non-Patent Citations (1)
| Title |
|---|
| 数字化测量技术在飞机外形检测方面的应用研究;王梅 等;《数字化装配检测》;20131231;第109-112页 * |
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| Publication number | Publication date |
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| CN107782251A (en) | 2018-03-09 |
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Granted publication date: 20191217 |