CN113670234B - Display method, measurement system and laser radar for actual measurement - Google Patents

Display method, measurement system and laser radar for actual measurement Download PDF

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Publication number
CN113670234B
CN113670234B CN202110685889.1A CN202110685889A CN113670234B CN 113670234 B CN113670234 B CN 113670234B CN 202110685889 A CN202110685889 A CN 202110685889A CN 113670234 B CN113670234 B CN 113670234B
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wall body
acquiring
points
point
plane
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CN113670234A (en
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李辉
金海建
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Angrui Hangzhou Information Technology Co ltd
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Angrui Hangzhou Information Technology Co ltd
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    • 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
    • G01B11/30—Measuring arrangements characterised by the use of optical techniques for measuring roughness or irregularity of surfaces
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
    • G01S17/88—Lidar systems specially adapted for specific applications
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T17/00—Three dimensional [3D] modelling, e.g. data description of 3D objects
    • G06T17/10—Constructive solid geometry [CSG] using solid primitives, e.g. cylinders, cubes
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T7/00—Image analysis
    • G06T7/10—Segmentation; Edge detection
    • G06T7/11—Region-based segmentation
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T7/00—Image analysis
    • G06T7/60—Analysis of geometric attributes
    • G06T7/62—Analysis of geometric attributes of area, perimeter, diameter or volume
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T2207/00—Indexing scheme for image analysis or image enhancement
    • G06T2207/10—Image acquisition modality
    • G06T2207/10004—Still image; Photographic image
    • G06T2207/10012—Stereo images

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  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Geometry (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Remote Sensing (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Computer Graphics (AREA)
  • Software Systems (AREA)
  • Electromagnetism (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Length Measuring Devices By Optical Means (AREA)
  • Optical Radar Systems And Details Thereof (AREA)

Abstract

The invention discloses a display method, a measurement system and a laser radar for actual measurement, wherein the display method comprises the following steps: scanning a wall body to obtain three-dimensional data points of the wall body; acquiring a plane area in the three-dimensional data point as a zero plane through principal component analysis of the three-dimensional data point; dividing the three-dimensional data point into a plurality of data point areas; obtaining the distance from the target area to the zero plane; and displaying the image corresponding to the data point area in the zero plane at the position corresponding to the zero plane in a display interface by using the basic color, and displaying the image corresponding to the target area in the preset color at the position corresponding to the target area of the display interface. The display method, the measurement system and the laser radar can intuitively and detailedly display the flatness of the wall body, improve the informatization degree of the building industry, provide convenience for users to accept and rectify the wall body, and accelerate the construction progress.

Description

Display method, measurement system and laser radar for actual measurement
Technical Field
The invention relates to a display method, a measurement system and a laser radar for actual measurement.
Background
The actual measurement refers to a method which uses a measuring tool to test, measure and truly reflect the quality data of a product on site. And according to the related quality acceptance standard, measuring and controlling engineering quality data errors to be in a range allowed by national housing construction standards.
The project development stage related to actual measurement mainly comprises a main body structure stage, a masonry stage, a plastering stage, a device installation stage and a finishing stage. The measuring range comprises a concrete structure, a masonry engineering, a plastering engineering, a waterproof engineering, a door and window engineering, a paint engineering, a finishing engineering and the like.
The existing actual measurement tool is low in use efficiency, single in function and inconvenient to check.
Disclosure of Invention
The invention aims to overcome the defects of low use efficiency, single function and inconvenience in checking of the existing actual measurement tool in the prior art, and provides a display method, a measurement system and a laser radar for actually measuring the actual measurement, which can intuitively and detailedly display the flatness of a wall, promote the informatization degree of the building industry, provide convenience for users to check and accept and correct the wall and accelerate the construction progress.
The invention solves the technical problems by the following technical scheme:
a display method for actually measured real quantities, characterized in that the display method comprises:
Scanning a wall body to obtain three-dimensional data points of the wall body;
Acquiring a plane area in the three-dimensional data points as a zero plane through analyzing principal components of the three-dimensional data points, wherein the plane area is a continuous largest-area plane formed by the three-dimensional data points;
dividing the three-dimensional data point into a plurality of data point areas, wherein the size of each data point area is the same;
Acquiring the distance from a target area to the zero plane, wherein the target area is a data point area except the plane area;
Displaying images corresponding to the data point areas in the zero plane at the positions corresponding to the zero plane in a display interface by using basic colors, displaying images corresponding to the target areas at the positions corresponding to the target areas of the display interface by using preset colors, and acquiring the preset colors of the target areas according to the distances.
Preferably, the display method includes:
scanning a room by using a laser radar to obtain a space point cloud;
dividing the space point cloud into a plurality of voxel units, and acquiring information of the voxel units according to point cloud coordinates contained in the voxel units;
combining the voxel units which are correlated with each other into a sub-model according to the information of the voxel units;
acquiring semantic information of the sub-model according to the position and the size of the sub-model and the relation between adjacent sub-models;
and obtaining a sub-model of the wall body according to the semantic information, wherein the point cloud coordinates contained in the sub-model of the wall body are the three-dimensional data points.
Preferably, the display method includes:
For a target area, searching a preset color of the target area in a comparison table, wherein the comparison table comprises a plurality of value ranges of the distance, and each value range corresponds to one color.
Preferably, in the comparison table, the color corresponding to the value range is warm color when the value of the value range is positive, and the color corresponding to the value range is cool color when the value of the value range is negative.
Preferably, the display method includes:
generating a laser surface vertical to a horizontal plane in front of the wall body by using a laser leveling instrument;
Acquiring two adjusting points on a zero plane of the display interface, and acquiring the length from the adjusting points to the wall boundary according to the coordinates of the adjusting points;
searching the actual position of the adjusting point on the wall according to the length;
The measuring scale is vertically placed on the wall body at the actual position, scales of the laser surface on the measuring scale are checked, and the laser surface is adjusted to be parallel to the wall surface corresponding to the zero plane by using the same scales of the two actual positions;
selecting a plurality of re-core points on the display interface, and acquiring the length from the re-core points to the wall boundary according to the coordinates of the re-core points;
searching the actual position of the rechecking point on the wall body;
And vertically placing the measuring tape on the wall body at the actual position of the rechecking point, checking whether the scale of the laser surface on the measuring tape is matched with the three-dimensional data point corresponding to the rechecking point, and if so, rechecking successfully.
Preferably, the display method includes:
selecting a plurality of correction points on the display interface, and acquiring the length from the correction points to the wall boundary according to the coordinates of the correction points;
Searching the actual position of the correction point on the wall body;
vertically placing the measuring tape on the wall body at the actual position of the correction point, and checking the scale of the laser surface on the measuring tape to obtain the correction amount;
And rectifying the wall body by utilizing the rectifying amount.
The invention also provides a measuring system for actually measuring the real quantity, which is characterized in that the measuring system comprises a laser radar and a processing module,
The laser radar is used for scanning a wall body to obtain three-dimensional data points of the wall body;
The processing module is used for obtaining a plane area in the three-dimensional data points as a zero plane through analyzing the principal components of the three-dimensional data points, wherein the plane area is a continuous largest-area plane formed by the three-dimensional data points;
The processing module is used for dividing the three-dimensional data point into a plurality of data point areas, and the size of each data point area is the same;
The processing module is used for acquiring the distance from a target area to the zero plane, wherein the target area is a data point area except the plane area;
the processing module is used for displaying images corresponding to the data point areas in the zero plane in the position corresponding to the zero plane in a display interface in a basic color mode, displaying images corresponding to the target areas in the position corresponding to the target areas of the display interface in a preset color mode, and acquiring the preset colors of the target areas according to the distance.
Preferably, the method comprises the steps of,
The laser radar is used for scanning a room to obtain a space point cloud;
The processing module is used for dividing the space point cloud into a plurality of voxel units and acquiring the information of the voxel units according to the point cloud coordinates contained in the voxel units;
the processing module is used for merging the voxel units which are correlated with each other into a sub-model according to the information of the voxel units;
the processing module is used for acquiring semantic information of the sub-model according to the position and the size of the sub-model and the relation between adjacent sub-models;
the processing module is used for acquiring a sub-model of the wall body according to the semantic information, and the point cloud coordinates contained in the sub-model of the wall body are the three-dimensional data points.
Preferably, the measuring system further comprises a laser leveling instrument and a measuring scale;
the laser leveling instrument is used for generating a laser surface vertical to a horizontal plane in front of the wall body;
the processing module is used for acquiring two adjusting points on the zero plane of the display interface and acquiring the length from the adjusting points to the wall boundary according to the coordinates of the adjusting points;
The measuring tape is used for searching the actual position of the adjusting point on the wall according to the length, then placing the measuring tape on the wall at the actual position, checking the scale of the laser surface on the measuring tape, and adjusting the laser surface to be parallel to the wall corresponding to the zero plane by using the same scale of the two actual positions;
the processing module is used for selecting a plurality of re-core points on the display interface, and acquiring the length from the re-core points to the wall boundary according to the coordinates of the re-core points;
The measuring tape is used for searching the actual position of the rechecking point on the wall body, then placing the measuring tape on the wall body at the actual position of the rechecking point, checking whether the scale of the laser surface on the measuring tape is matched with the three-dimensional data point corresponding to the rechecking point or not, and if so, rechecking is successful.
The invention also provides a laser radar for actually measuring real quantities, which is characterized in that the laser radar is used in a measuring system as described above.
On the basis of conforming to the common knowledge in the field, the above preferred conditions can be arbitrarily combined to obtain the preferred examples of the invention.
The invention has the positive progress effects that:
The display method, the measurement system and the laser radar can intuitively and detailedly display the flatness of the wall body, improve the informatization degree of the building industry, provide convenience for users to accept and rectify the wall body, and accelerate the construction progress.
Drawings
Fig. 1 is a schematic structural diagram of a display interface according to embodiment 1 of the present invention.
Fig. 2 is a flowchart of a display method according to embodiment 1 of the present invention.
Detailed Description
The invention is further illustrated by means of the following examples, which are not intended to limit the scope of the invention.
Example 1
The present embodiment provides a measurement system for actually measuring a real quantity.
The measuring system comprises a laser radar, a processing module, a laser leveling instrument and a measuring ruler. The processing module can be a tablet computer or a desktop computer, and can be integrated into the laser radar, so that the laser radar has operation capability.
The laser radar is used for scanning a wall body to obtain three-dimensional data points of the wall body;
The processing module is used for obtaining a plane area in the three-dimensional data points as a zero plane through analyzing the principal components of the three-dimensional data points, wherein the plane area is a continuous largest-area plane formed by the three-dimensional data points;
The processing module is used for dividing the three-dimensional data point into a plurality of data point areas, and the size of each data point area is the same;
Referring to fig. 1, in this embodiment, a wall center point and a wall normal vector are calculated by principal component analysis of three-dimensional data points of a wall, that is, a maximum plane of the wall is found by principal component analysis to be a zero plane 11.
Dividing the wall surface into N.M small wall surfaces with the length and the width of 25 mm.25 mm,
The processing module is used for acquiring the distance from a target area to the zero plane, wherein the target area is a data point area except the plane area;
the processing module is used for displaying images corresponding to the data point areas in the zero plane in the position corresponding to the zero plane in a display interface in a basic color mode, displaying images corresponding to the target areas in the position corresponding to the target areas of the display interface in a preset color mode, and acquiring the preset colors of the target areas according to the distance.
The position of the zero plane can be obtained according to the three-dimensional data point coordinates in the zero plane, the distance between the three-dimensional data point and the wall edge can accurately obtain the range and the position of the zero plane, and the position of the target area can be obtained.
The display interface is a display screen of a tablet personal computer and can also be a small screen on the side surface of the laser radar.
Further, the laser radar is used for scanning a room to obtain a space point cloud;
The processing module is used for dividing the space point cloud into a plurality of voxel units and acquiring the information of the voxel units according to the point cloud coordinates contained in the voxel units;
the processing module is used for merging the voxel units which are correlated with each other into a sub-model according to the information of the voxel units;
the processing module is used for acquiring semantic information of the sub-model according to the position and the size of the sub-model and the relation between adjacent sub-models;
in this embodiment, according to the positions of the window and the door, it is possible to separate which sub-models are the door and which are the windows, for example, the door is a hollow that falls to the ground, and the window is a hollow that is a certain distance from the ground, etc. Thereby obtaining the meaning of each sub-model.
The voxel units comprise a plurality of point cloud coordinates, and similar voxel units are combined, for example, the voxel units are parallel and connected and can be combined into a wall, the target voxel unit is connected with two mutually perpendicular voxel units, and then the target voxel unit is a corner line.
The processing module is used for acquiring a sub-model of the wall body according to the semantic information, and the point cloud coordinates contained in the sub-model of the wall body are the three-dimensional data points.
Further, for a target area, the processing module is configured to search a look-up table for a preset color of the target area, where the look-up table includes a plurality of value ranges of the distance, and each value range corresponds to a color.
In the comparison table, the color corresponding to the value range is warm color when the value of the value range is positive, and the color corresponding to the value range is cold color when the value of the value range is negative.
In this embodiment, the warm tone indicates the convex 12, the green indicates the zero plane 11, the cold color indicates the concave 13, and the warm color indicates the depth by the same color system, for example, the red indicates the convex, and the darker the red indicates the more convex.
Further, the laser leveling instrument is used for generating a laser surface vertical to the horizontal plane in front of the wall body;
the processing module is used for acquiring two adjusting points on the zero plane of the display interface and acquiring the length from the adjusting points to the wall boundary according to the coordinates of the adjusting points;
The measuring tape is used for searching the actual position of the adjusting point on the wall according to the length, then placing the measuring tape on the wall at the actual position, checking the scale of the laser surface on the measuring tape, and adjusting the laser surface to be parallel to the wall corresponding to the zero plane by using the same scale of the two actual positions;
In this embodiment, the scales of the laser on the measuring scale are the same at the two adjusting points, so that the laser surface is parallel to the wall surface corresponding to the zero plane. And after the laser surface is parallel to the zero plane, acquiring the distance between the laser surface and the zero plane.
The processing module is used for selecting a plurality of re-core points on the display interface, and acquiring the length from the re-core points to the wall boundary according to the coordinates of the re-core points;
The measuring tape is used for searching the actual position of the rechecking point on the wall body, then placing the measuring tape on the wall body at the actual position of the rechecking point, checking whether the scale of the laser surface on the measuring tape is matched with the three-dimensional data point corresponding to the rechecking point or not, and if so, rechecking is successful.
And searching the distance between the rechecking point and the zero plane by using a display interface, calculating a theoretical value of the laser surface on the measuring scale by using the distance between the rechecking point and the zero plane and the distance between the laser surface and the zero plane at the actual position of the rechecking point, and checking whether the actual position of the laser surface on the measuring scale corresponds to the theoretical value or not, if so, compounding is successful.
The processing module is used for selecting a plurality of correction points on the display interface, and acquiring the length from the correction points to the wall boundary according to the coordinates of the correction points;
The measuring scale is used for searching the actual position of the correction point on the wall body, then placing the measuring scale on the wall body at the actual position of the correction point, and checking the scale of the laser surface on the measuring scale to obtain the correction amount;
And the user rectifies the wall body by utilizing the rectifying quantity.
Referring to fig. 2, with the above measurement system, the present embodiment further provides a display method, where the display method includes:
step 100, scanning a wall body to obtain three-dimensional data points of the wall body;
Step 101, obtaining a plane area in the three-dimensional data point as a zero plane through analyzing the principal components of the three-dimensional data point, wherein the plane area is a continuous largest-area plane formed by the three-dimensional data point;
102, dividing the three-dimensional data point into a plurality of data point areas, wherein the size of each data point area is the same;
step 103, obtaining the distance from a target area to the zero plane, wherein the target area is a data point area except the plane area;
And 104, displaying an image corresponding to the data point area in the zero plane at the position corresponding to the zero plane in a display interface by using a basic color, displaying an image corresponding to the target area at the position corresponding to the target area of the display interface by using a preset color, and acquiring the preset color of the target area according to the distance.
Wherein, step 100 includes:
scanning a room by using a laser radar to obtain a space point cloud;
dividing the space point cloud into a plurality of voxel units, and acquiring information of the voxel units according to point cloud coordinates contained in the voxel units;
combining the voxel units which are correlated with each other into a sub-model according to the information of the voxel units;
acquiring semantic information of the sub-model according to the position and the size of the sub-model and the relation between adjacent sub-models;
and obtaining a sub-model of the wall body according to the semantic information, wherein the point cloud coordinates contained in the sub-model of the wall body are the three-dimensional data points.
The display method further comprises the following steps:
For a target area, searching a preset color of the target area in a comparison table, wherein the comparison table comprises a plurality of value ranges of the distance, and each value range corresponds to one color.
In the comparison table, the color corresponding to the value range is warm color when the value of the value range is positive, and the color corresponding to the value range is cool color when the value of the value range is negative.
Further, step 100 is followed by:
generating a laser surface vertical to a horizontal plane in front of the wall body by using a laser leveling instrument;
Acquiring two adjusting points on a zero plane of the display interface, and acquiring the length from the adjusting points to the wall boundary according to the coordinates of the adjusting points;
searching the actual position of the adjusting point on the wall according to the length;
The measuring scale is vertically placed on the wall body at the actual position, scales of the laser surface on the measuring scale are checked, and the laser surface is adjusted to be parallel to the wall surface corresponding to the zero plane by using the same scales of the two actual positions;
selecting a plurality of re-core points on the display interface, and acquiring the length from the re-core points to the wall boundary according to the coordinates of the re-core points;
searching the actual position of the rechecking point on the wall body;
And vertically placing the measuring tape on the wall body at the actual position of the rechecking point, checking whether the scale of the laser surface on the measuring tape is matched with the three-dimensional data point corresponding to the rechecking point, and if so, rechecking successfully.
The display method after the re-coincidence is successful further comprises the following steps:
selecting a plurality of correction points on the display interface, and acquiring the length from the correction points to the wall boundary according to the coordinates of the correction points;
Searching the actual position of the correction point on the wall body;
vertically placing the measuring tape on the wall body at the actual position of the correction point, and checking the scale of the laser surface on the measuring tape to obtain the correction amount;
And rectifying the wall body by utilizing the rectifying amount.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that these are by way of example only, and the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the principles and spirit of the invention, but such changes and modifications fall within the scope of the invention.

Claims (8)

1. A display method for actually measured real quantities, the display method comprising:
Scanning a wall body to obtain three-dimensional data points of the wall body;
Acquiring a plane area in the three-dimensional data points as a zero plane through analyzing principal components of the three-dimensional data points, wherein the plane area is a continuous largest-area plane formed by the three-dimensional data points;
dividing the three-dimensional data point into a plurality of data point areas, wherein the size of each data point area is the same;
Acquiring the distance from a target area to the zero plane, wherein the target area is a data point area except the plane area;
Displaying images corresponding to the data point areas in the zero plane at the positions corresponding to the zero plane in a display interface by using basic colors, displaying images corresponding to the target areas at the positions corresponding to the target areas of the display interface by using preset colors, and acquiring the preset colors of the target areas according to the distances;
The display method comprises the following steps:
generating a laser surface vertical to a horizontal plane in front of the wall body by using a laser leveling instrument;
Acquiring two adjusting points on a zero plane of the display interface, and acquiring the length from the adjusting points to the wall boundary according to the coordinates of the adjusting points;
searching the actual position of the adjusting point on the wall according to the length;
The measuring scale is vertically placed on the wall body at the actual position, scales of the laser surface on the measuring scale are checked, and the laser surface is adjusted to be parallel to the wall surface corresponding to the zero plane by using the same scales of the two actual positions;
selecting a plurality of re-core points on the display interface, and acquiring the length from the re-core points to the wall boundary according to the coordinates of the re-core points;
searching the actual position of the rechecking point on the wall body;
And vertically placing the measuring tape on the wall body at the actual position of the rechecking point, checking whether the scale of the laser surface on the measuring tape is matched with the three-dimensional data point corresponding to the rechecking point, and if so, rechecking successfully.
2. The display method according to claim 1, wherein the display method includes:
scanning a room by using a laser radar to obtain a space point cloud;
dividing the space point cloud into a plurality of voxel units, and acquiring information of the voxel units according to point cloud coordinates contained in the voxel units;
combining the voxel units which are correlated with each other into a sub-model according to the information of the voxel units;
acquiring semantic information of the sub-model according to the position and the size of the sub-model and the relation between adjacent sub-models;
and obtaining a sub-model of the wall body according to the semantic information, wherein the point cloud coordinates contained in the sub-model of the wall body are the three-dimensional data points.
3. The display method according to claim 1, wherein the display method includes:
For a target area, searching a preset color of the target area in a comparison table, wherein the comparison table comprises a plurality of value ranges of the distance, and each value range corresponds to one color.
4. A display method according to claim 3, wherein in the comparison table, the color corresponding to the value range is warm color when the value of the value range is positive, and the color corresponding to the value range is cool color when the value of the value range is negative.
5. The display method according to claim 1, wherein the display method includes:
selecting a plurality of correction points on the display interface, and acquiring the length from the correction points to the wall boundary according to the coordinates of the correction points;
Searching the actual position of the correction point on the wall body;
vertically placing the measuring tape on the wall body at the actual position of the correction point, and checking the scale of the laser surface on the measuring tape to obtain the correction amount;
And rectifying the wall body by utilizing the rectifying amount.
6. A measuring system for actual measurement of real quantities, characterized in that the measuring system comprises a laser radar and a processing module,
The laser radar is used for scanning a wall body to obtain three-dimensional data points of the wall body;
The processing module is used for obtaining a plane area in the three-dimensional data points as a zero plane through analyzing the principal components of the three-dimensional data points, wherein the plane area is a continuous largest-area plane formed by the three-dimensional data points;
The processing module is used for dividing the three-dimensional data point into a plurality of data point areas, and the size of each data point area is the same;
The processing module is used for acquiring the distance from a target area to the zero plane, wherein the target area is a data point area except the plane area;
the processing module is used for displaying images corresponding to the data point areas in the zero plane in the position corresponding to the zero plane in a display interface in a basic color mode, displaying images corresponding to the target areas in the position corresponding to the target areas of the display interface in a preset color mode, and acquiring the preset colors of the target areas according to the distance;
The measuring system further comprises a laser leveling instrument and a measuring scale;
the laser leveling instrument is used for generating a laser surface vertical to a horizontal plane in front of the wall body;
the processing module is used for acquiring two adjusting points on the zero plane of the display interface and acquiring the length from the adjusting points to the wall boundary according to the coordinates of the adjusting points;
The measuring tape is used for searching the actual position of the adjusting point on the wall according to the length, then placing the measuring tape on the wall at the actual position, checking the scale of the laser surface on the measuring tape, and adjusting the laser surface to be parallel to the wall corresponding to the zero plane by using the same scale of the two actual positions;
the processing module is used for selecting a plurality of re-core points on the display interface, and acquiring the length from the re-core points to the wall boundary according to the coordinates of the re-core points;
The measuring tape is used for searching the actual position of the rechecking point on the wall body, then placing the measuring tape on the wall body at the actual position of the rechecking point, checking whether the scale of the laser surface on the measuring tape is matched with the three-dimensional data point corresponding to the rechecking point or not, and if so, rechecking is successful.
7. The measurement system of claim 6, wherein,
The laser radar is used for scanning a room to obtain a space point cloud;
The processing module is used for dividing the space point cloud into a plurality of voxel units and acquiring the information of the voxel units according to the point cloud coordinates contained in the voxel units;
the processing module is used for merging the voxel units which are correlated with each other into a sub-model according to the information of the voxel units;
the processing module is used for acquiring semantic information of the sub-model according to the position and the size of the sub-model and the relation between adjacent sub-models;
the processing module is used for acquiring a sub-model of the wall body according to the semantic information, and the point cloud coordinates contained in the sub-model of the wall body are the three-dimensional data points.
8. A lidar for actual measurement of real world quantities, characterized in that the lidar is used in a measurement system according to claim 6 or 7.
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