CN112762790A - Method for measuring crown width in three-dimensional virtual scene - Google Patents
Method for measuring crown width in three-dimensional virtual scene Download PDFInfo
- Publication number
- CN112762790A CN112762790A CN202011550225.6A CN202011550225A CN112762790A CN 112762790 A CN112762790 A CN 112762790A CN 202011550225 A CN202011550225 A CN 202011550225A CN 112762790 A CN112762790 A CN 112762790A
- Authority
- CN
- China
- Prior art keywords
- camera
- tree
- crown
- graduated scale
- width
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 32
- 230000000007 visual effect Effects 0.000 claims description 7
- 238000005259 measurement Methods 0.000 abstract description 20
- 238000004364 calculation method Methods 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 9
- 238000011161 development Methods 0.000 description 5
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012360 testing method Methods 0.000 description 2
- 230000002860 competitive effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/02—Measuring arrangements characterised by the use of mechanical techniques for measuring length, width or thickness
-
- 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
- G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
- G01B11/03—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness by measuring coordinates of points
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
A method for measuring the width of a crown in a three-dimensional virtual scene belongs to the technical field of computer and forest measurement. The measurement of the widths of the crowns with different heights is realized by constructing a camera in a three-dimensional scene, constructing a graduated scale in the three-dimensional scene, calculating the distance from the camera to a trunk, updating and calculating the space coordinate of the graduated scale and a given crown width calculation method. The invention has the advantages that: under the condition of not directly contacting trees, the widths of the crowns with different heights can be conveniently and accurately measured by using a graduated scale, and effective technical support is provided for mastering the characteristics of the crowns, measuring and calculating the surface area and the volume of the crowns and quantitatively knowing the growth condition of the trees.
Description
Technical Field
The invention relates to a method for measuring the width of a crown in a three-dimensional virtual scene, and belongs to the technical field of computer and forest measurement.
Background
The crown is an important index for representing the form of the tree, and the size of the crown is an important characteristic parameter for reflecting the health degree and the competitive power of the tree. The method for acquiring the crown width characteristics of different heights has important significance for mastering the growth condition of the trees.
Common methods for measuring the widths of crowns with different heights comprise: (1) directly measuring felled trees; (2) measuring by using precision instruments and equipment, such as total station, three-dimensional laser scanner, knapsack laser radar and other high-precision measuring equipment; (3) the height measuring rod or the height measuring instrument is combined with the tape measure or the sliding staff for measurement. The method can measure the widths of the crowns at different heights, but has the following problems: (1) the first method is destructive measurement, and the tree needs to be felled for measurement; (2) the second method has higher requirements on instruments and equipment, and has more complex measuring process, data processing and factor extraction process, and needs to have relevant professional knowledge and higher business capability; (3) the third method is to realize measurement by mutual cooperation of simple instruments, but when the tree height value is large, the accuracy and stability of measurement cannot be effectively guaranteed, so that the method has low measurement result precision. In combination with the above problems, it is necessary to provide a nondestructive, convenient and high-precision method for measuring the widths of crowns of different heights of trees.
The three-dimensional virtual simulation technology is a common test or testing means for new product production or new method research and development, and can provide effective guarantee for real-world application of products or methods. By utilizing the advantages of the three-dimensional virtual simulation technology, the three-dimensional virtual simulation technology is combined with the crown width measuring method, the crown width measuring method in the three-dimensional virtual scene is provided, the effective measurement of the crown widths with different heights in the three-dimensional virtual scene is realized, and innovative ideas and technical references can be provided for solving the problems existing in the actual measurement of the real crown.
Disclosure of Invention
In order to overcome the defects of the prior art and solve the problems of loss, complexity, unstable precision and the like of the existing crown width measuring method with different heights, a three-dimensional virtual simulation technology is combined with the crown width measuring requirement, the crown width measuring method with different heights is provided in a three-dimensional virtual scene, the nondestructive, convenient and high-precision measurement of the crown widths with different heights is realized, a reference is provided for improving the actual crown width measuring method, and the measuring levels of the crown widths with different heights are improved.
A method for measuring the width of a crown in a three-dimensional virtual scene comprises the following steps: the method comprises the steps of constructing a camera in a three-dimensional scene, constructing a graduated scale in the three-dimensional scene, calculating the distance from the camera to a trunk, updating and calculating the spatial coordinate of the graduated scale and calculating the width of a tree crown.
Firstly, creating a camera in a three-dimensional virtual scene, setting the coordinates of the camera to be (X, Y, Z) and facing a tree to enable the whole tree to be visible;
secondly, constructing a graduated scale with the size of M cm in the three-dimensional virtual scene, wherein the graduated scale is placed in the middle in the visual field of the camera, is parallel to the local X axis of the camera and has a vertical distance of A M from the camera;
thirdly, arranging a spherical object in the three-dimensional virtual scene to horizontally move towards the trunk of the tree at a constant speed of V m/s from the position of the camera along the local Z-axis direction of the camera; recording the time taken for the ball to hit the trunk, measured as T s; thus, the horizontal distance S from the camera to the trunk is calculated, S ═ V × T, in m;
fourthly, when the width of the crown at the height H of the tree is measured, the coordinate of the graduated scale is updated to be (0, A multiplied by sin (arctan ((H-Y)/S)), A multiplied by cos (arctan ((H-Y)/S)), and H-Y is the value of the height H of the tree minus the coordinate value of the Y axis of the camera;
fifthly, cylinders for connecting two points are respectively constructed from the position of the camera to the left edge and the right edge of the crown at the height H of the tree, and the two cylinders and the graduated scale are respectively intersected at E, F two points; if the two cylinders and the graduated scale do not have intersection points, adjusting the value of M and A in the second step; the crown width C at the tree height H is calculated in m, (S/cos (arctan (H-Y)/S))) × D/a, where D is the value of the crown width read at the camera mapped to the scale, i.e. E, F spatial distance in m.
The invention has the advantages that: under the condition of not directly contacting trees, the widths of the crowns with different heights can be conveniently and accurately measured by using a graduated scale, and effective technical support is provided for mastering the characteristics of the crowns, measuring and calculating the surface area and the volume of the crowns and quantitatively knowing the growth condition of the trees.
Drawings
A more complete appreciation of the invention and many of the attendant advantages thereof will be readily obtained as the same becomes better understood by reference to the following detailed description when considered in connection with the accompanying drawings, wherein the accompanying drawings are included to provide a further understanding of the invention and form a part of this specification, and wherein the illustrated embodiments of the invention and the description thereof are intended to illustrate and not limit the invention, as illustrated in the accompanying drawings, in which:
FIG. 1 is a schematic diagram of a built-in camera of the present invention.
FIG. 2 is a schematic view of a scale built within the scene of the present invention.
FIG. 3 is a schematic view of crown width measurement in a scene according to the present invention.
The invention is further illustrated with reference to the following figures and examples.
Detailed Description
It will be apparent that those skilled in the art can make many modifications and variations based on the spirit of the present invention.
As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element, component or section is referred to as being "connected" to another element, component or section, it can be directly connected to the other element or section or intervening elements or sections may also be present. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art.
The following examples are further illustrative in order to facilitate the understanding of the embodiments, and the present invention is not limited to the examples.
Example 1: a method for measuring the width of a crown in a three-dimensional virtual scene comprises the following steps:
step 1), building a three-dimensional virtual scene containing trees by using a Unity three-dimensional development engine (a cross-platform 2D/3D game engine developed by Unity Technologies); a camera is created with coordinates set to (0, 1.5, 0) facing the tree and making the tree visible in its entirety, as shown in fig. 1. The space coordinate of the camera can be properly adjusted and set according to the specific position condition of the tree;
step 2), constructing a 50.0cm graduated scale in the three-dimensional virtual scene, centrally placing the graduated scale in the visual field of the camera, and enabling the graduated scale to be parallel to the local X axis of the camera and to be 0.5m away from the camera in a vertical distance, as shown in FIG. 2;
and 3) arranging a spherical object in the three-dimensional virtual scene, and enabling the spherical object to horizontally move to the trunk of the tree at a constant speed of 6.0m/s from the position of the camera along the local Z-axis direction of the camera, wherein the time for the spherical object to collide with the trunk is 2.0 s. Calculating the horizontal distance from the camera to the trunk to be 12.0 m;
step 4), when the width of the crown at the position of 9.0m of the tree height is measured, updating the coordinate of the graduated scale relative to the coordinate of the camera to be (0, 0.26, 0.42);
and 5) respectively constructing cylinders for connecting two points from the position of the camera to the left edge and the right edge of the crown at the position of 9.0m of the tree, wherein the two cylinders and the graduated scale are respectively intersected at E, F points. The crown width C at 9.0m of the tree height was calculated as m, where C is (12.0/cos (arctan ((9.0-1.5)/12.0))) × D/0.5 is 3.9, where D is the spatial distance between E, F points, which is 0.138m, as shown in fig. 3.
At this point, the height crown width measurement is completed.
Example 2: a method for measuring the width of a crown in a three-dimensional virtual scene comprises the following steps:
step 1), building a three-dimensional virtual scene containing trees by using a Unity three-dimensional development engine (a cross-platform 2D/3D game engine developed by Unity Technologies); a camera is created with coordinates set to (0, 1.5, 0) facing the tree and making the tree visible in its entirety. The space coordinate of the camera can be properly adjusted and set according to the specific position condition of the tree;
step 2), constructing a 50.0cm graduated scale in the three-dimensional virtual scene, centrally placing the graduated scale in the visual field of the camera, and enabling the graduated scale to be parallel to the local X axis of the camera and to be 0.5m away from the camera;
and 3) arranging a spherical object in the three-dimensional virtual scene, and enabling the spherical object to horizontally move to the trunk of the tree at a constant speed of 6.0m/s from the position of the camera along the local Z-axis direction of the camera, wherein the time for the spherical object to collide with the trunk is 2.0 s. Calculating the horizontal distance from the camera to the trunk to be 12.0 m;
step 4), when the width of the crown at the position of 6.0m of the tree height is measured, updating the coordinate of the graduated scale relative to the coordinate of the camera to be (0, 0.18, 0.47);
and 5) respectively constructing cylinders for connecting two points from the position of the camera to the left edge and the right edge of the crown at the position of 6.0m of the tree, wherein the two cylinders and the graduated scale are respectively intersected at E, F two points. The crown width C at 6.0m of the tree height was calculated as m, where C is (12.0/cos (arctan ((6.0-1.5)/12.0))) × D/0.5 is 2.7, where D is the spatial distance between E, F points, which is 0.105 m.
At this point, the height crown width measurement is completed.
Example 3: a method for measuring the width of a crown in a three-dimensional virtual scene comprises the following steps:
step 1), building a three-dimensional virtual scene containing trees by using a Unity three-dimensional development engine (a cross-platform 2D/3D game engine developed by Unity Technologies); a camera is created with coordinates set to (0, 1.5, 0) facing the tree and making the tree visible in its entirety. The space coordinate of the camera can be properly adjusted and set according to the specific position condition of the tree;
step 2), constructing a 50.0cm graduated scale in the three-dimensional virtual scene, centrally placing the graduated scale in the visual field of the camera, and enabling the graduated scale to be parallel to the local X axis of the camera and to be 0.5m away from the camera;
and 3) arranging a spherical object in the three-dimensional virtual scene, and enabling the spherical object to horizontally move to the trunk of the tree at a constant speed of 6.0m/s from the position of the camera along the local Z-axis direction of the camera, wherein the time for the spherical object to collide with the trunk is 2.0 s. Calculating the horizontal distance from the camera to the trunk to be 12.0 m;
step 4), when the width of the crown at the position of 7.0m of the tree height is measured, updating the coordinate of the graduated scale relative to the coordinate of the camera to be (0, 0.21, 0.45);
and 5) respectively constructing cylinders for connecting two points from the position of the camera to the left edge and the right edge of the crown at the position of 7.0m of the tree, wherein the two cylinders and the graduated scale are respectively intersected at E, F two points. The crown width C at 7.0m of the tree height was calculated as m, where C is (12.0/cos (arctan ((7.0-1.5)/12.0))) × D/0.5 is 4.0, where D is the spatial distance between E, F points, which is 0.152 m.
At this point, the height crown width measurement is completed.
Example 4: a method for measuring the width of a crown in a three-dimensional virtual scene comprises the following steps:
step 1), building a three-dimensional virtual scene containing trees by using a Unity three-dimensional development engine (a cross-platform 2D/3D game engine developed by Unity Technologies); a camera is created with coordinates set to (0, 1.5, 0) facing the tree and making the tree visible in its entirety. The space coordinate of the camera can be properly adjusted and set according to the specific position condition of the tree;
step 2), constructing a 50.0cm graduated scale in the three-dimensional virtual scene, centrally placing the graduated scale in the visual field of the camera, and enabling the graduated scale to be parallel to the local X axis of the camera and to be 0.5m away from the camera;
and 3) arranging a spherical object in the three-dimensional virtual scene, and enabling the spherical object to horizontally move to the trunk of the tree at a constant speed of 6.0m/s from the position of the camera along the local Z-axis direction of the camera, wherein the time for the spherical object to collide with the trunk is 2.0 s. Calculating the horizontal distance from the camera to the trunk to be 12.0 m;
step 4), when the width of the crown at the position of the tree height of 8.0m is measured, updating the coordinate of the graduated scale relative to the coordinate of the camera to be (0, 0.24, 0.44);
and 5) respectively constructing cylinders for connecting two points from the position of the camera to the left edge and the right edge of the crown at the position of 8.0m of the tree, wherein the two cylinders and the graduated scale are respectively intersected at E, F two points. The crown width C at 8.0m of the tree height was calculated as m, where C is (12.0/cos (arctan ((8.0-1.5)/12.0))) × D/0.5 is 4.2, where D is the spatial distance between E, F points, which is 0.154 m.
At this point, the height crown width measurement is completed.
Example 5: a method for measuring the width of a crown in a three-dimensional virtual scene comprises the following steps:
step 1), building a three-dimensional virtual scene containing trees by using a Unity three-dimensional development engine (a cross-platform 2D/3D game engine developed by Unity Technologies); a camera is created with coordinates set to (0, 1.5, 0) facing the tree and making the tree visible in its entirety. The space coordinate of the camera can be properly adjusted and set according to the specific position condition of the tree;
step 2), constructing a 50.0cm graduated scale in the three-dimensional virtual scene, centrally placing the graduated scale in the visual field of the camera, and enabling the graduated scale to be parallel to the local X axis of the camera and to be 0.5m away from the camera;
and 3) arranging a spherical object in the three-dimensional virtual scene, and enabling the spherical object to horizontally move to the trunk of the tree at a constant speed of 6.0m/s from the position of the camera along the local Z-axis direction of the camera, wherein the time for the spherical object to collide with the trunk is 2.0 s. Calculating the horizontal distance from the camera to the trunk to be 12.0 m;
step 4), when the width of the crown at the position of 10.0m of the tree height is measured, updating the coordinate of the graduated scale relative to the coordinate of the camera to be (0, 0.29, 0.41);
and 5) respectively constructing cylinders for connecting two points from the position of the camera to the left edge and the right edge of the crown at the position of 10.0m of the tree, wherein the two cylinders and the graduated scale are respectively intersected at E, F two points. The crown width C at 10.0m of the tree height was calculated as m, where C is (12.0/cos (arctan ((10.0-1.5)/12.0))) × D/0.5 is 3.2, where D is the spatial distance between E, F points, which is 0.109 m.
At this point, the height crown width measurement is completed.
The measured values of the crown width of 5 groups are shown in table 1 in comparison with the true values.
TABLE 1 comparison of crown Width measurements with truth
| Serial number | Height | Measured value | Truth value | Relative error |
| 1 | 6.0m | 2.7 | 2.6 | 3.8％ |
| 2 | 7.0m | 4.0 | 4.1 | 2.4％ |
| 3 | 8.0m | 4.2 | 4.0 | 5.0％ |
| 4 | 9.0m | 3.9 | 4.0 | 2.5％ |
| 5 | 10.0m | 3.2 | 3.3 | 3.0％ |
As shown in Table 1, the average relative error between the measured value and the true value obtained by the method is 3.34%, the measurement credibility is high, and the method can be used for measuring the widths of the crowns of the trees at different heights.
As described above, although the embodiments of the present invention have been described in detail, it will be apparent to those skilled in the art that many modifications are possible without substantially departing from the spirit and scope of the present invention. Therefore, such modifications are also all included in the scope of protection of the present invention.
Claims (2)
1. A method for measuring the width of a crown in a three-dimensional virtual scene is characterized by comprising the following steps: the method comprises the steps of constructing a camera in a three-dimensional scene, constructing a graduated scale in the three-dimensional scene, calculating the distance from the camera to a trunk, updating and calculating the spatial coordinate of the graduated scale and calculating the width of a tree crown.
2. The method for measuring the crown width in the three-dimensional virtual scene according to claim 1, comprising the following steps:
firstly, creating a camera in a three-dimensional virtual scene, setting the coordinates of the camera to be (X, Y, Z) and facing a tree to enable the whole tree to be visible;
secondly, constructing a graduated scale with the size of M cm in the three-dimensional virtual scene, wherein the graduated scale is placed in the middle in the visual field of the camera, is parallel to the local X axis of the camera and has a vertical distance Am from the camera;
thirdly, arranging a spherical object in the three-dimensional virtual scene to horizontally move towards the trunk of the tree at a constant speed of V m/s from the position of the camera along the local Z-axis direction of the camera; recording the time taken for the ball to hit the trunk, measured as T s; thus, the horizontal distance S from the camera to the trunk is calculated, S ═ V × T, in m;
fourthly, when the width of the crown at the height H of the tree is measured, the coordinate of the graduated scale is updated to be (0, A multiplied by sin (arctan ((H-Y)/S)), A multiplied by cos (arctan ((H-Y)/S)), and H-Y is the value of the height H of the tree minus the coordinate value of the Y axis of the camera;
fifthly, cylinders for connecting two points are respectively constructed from the position of the camera to the left edge and the right edge of the crown at the height H of the tree, and the two cylinders and the graduated scale are respectively intersected at E, F two points; if the two cylinders and the graduated scale do not have intersection points, adjusting the M and A values in the second step; the crown width C at the tree height H is calculated in m, (S/cos (arctan (H-Y)/S))) × D/a, where D is the value of the crown width read at the camera mapped to the scale, i.e. E, F spatial distance in m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011550225.6A CN112762790B (en) | 2020-12-24 | 2020-12-24 | Method for measuring crown width in three-dimensional virtual scene |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011550225.6A CN112762790B (en) | 2020-12-24 | 2020-12-24 | Method for measuring crown width in three-dimensional virtual scene |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112762790A true CN112762790A (en) | 2021-05-07 |
| CN112762790B CN112762790B (en) | 2022-05-10 |
Family
ID=75695517
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011550225.6A Expired - Fee Related CN112762790B (en) | 2020-12-24 | 2020-12-24 | Method for measuring crown width in three-dimensional virtual scene |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112762790B (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10153411A (en) * | 1996-11-21 | 1998-06-09 | Nippon Telegr & Teleph Corp <Ntt> | Interval measuring equipment and method for measuring internal |
| CN101288589A (en) * | 2008-04-25 | 2008-10-22 | 浙江省淡水水产研究所 | Non-invasive rapid detection device of aquatic animal morphological feature |
| CN102878934A (en) * | 2012-09-24 | 2013-01-16 | 北京林业大学 | Standing tree comprehensive detection device based on intelligent fusion technology |
| CN103162635A (en) * | 2013-02-21 | 2013-06-19 | 北京林业大学 | Method for measuring diameter at breast height and tree height with camera |
| CN105486235A (en) * | 2015-12-07 | 2016-04-13 | 高新兴科技集团股份有限公司 | A target measuring method in ball machine video images |
| CN105554247A (en) * | 2015-12-07 | 2016-05-04 | 魅族科技（中国）有限公司 | Measuring method, measuring system and terminal |
| US20180045504A1 (en) * | 2015-02-11 | 2018-02-15 | Huawei Technologies Co., Ltd. | Object Dimension Measurement Method and Apparatus |
| CN110986891A (en) * | 2019-12-06 | 2020-04-10 | 西北农林科技大学 | System for accurately and rapidly measuring crown width of tree by using unmanned aerial vehicle |
-
2020
- 2020-12-24 CN CN202011550225.6A patent/CN112762790B/en not_active Expired - Fee Related
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10153411A (en) * | 1996-11-21 | 1998-06-09 | Nippon Telegr & Teleph Corp <Ntt> | Interval measuring equipment and method for measuring internal |
| CN101288589A (en) * | 2008-04-25 | 2008-10-22 | 浙江省淡水水产研究所 | Non-invasive rapid detection device of aquatic animal morphological feature |
| CN102878934A (en) * | 2012-09-24 | 2013-01-16 | 北京林业大学 | Standing tree comprehensive detection device based on intelligent fusion technology |
| CN103162635A (en) * | 2013-02-21 | 2013-06-19 | 北京林业大学 | Method for measuring diameter at breast height and tree height with camera |
| US20180045504A1 (en) * | 2015-02-11 | 2018-02-15 | Huawei Technologies Co., Ltd. | Object Dimension Measurement Method and Apparatus |
| CN105486235A (en) * | 2015-12-07 | 2016-04-13 | 高新兴科技集团股份有限公司 | A target measuring method in ball machine video images |
| CN105554247A (en) * | 2015-12-07 | 2016-05-04 | 魅族科技（中国）有限公司 | Measuring method, measuring system and terminal |
| CN110986891A (en) * | 2019-12-06 | 2020-04-10 | 西北农林科技大学 | System for accurately and rapidly measuring crown width of tree by using unmanned aerial vehicle |
Non-Patent Citations (1)
| Title |
|---|
| 李伟等: "基于二维图像的距离测量方法", 《工具技术》 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112762790B (en) | 2022-05-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104748677B (en) | The method that plant forms are measured using 3 D laser scanning mode | |
| CN108759665B (en) | Spatial target three-dimensional reconstruction precision analysis method based on coordinate transformation | |
| CN102903145B (en) | Method for three-dimensional reconstruction of plant population morphological structure | |
| CN109751965B (en) | Precise spherical coupling part matching and gap measuring method based on three-dimensional point cloud | |
| CN103077559B (en) | Based on the fruit ear three-dimensional rebuilding method of sequence image | |
| CN109448043A (en) | Standing tree height extracting method under plane restriction | |
| Méndez et al. | In-field estimation of orange number and size by 3D laser scanning | |
| CN106323286B (en) | A kind of robot coordinate system and the transform method of three-dimensional measurement coordinate system | |
| CN112233249A (en) | B spline surface fitting method and device based on dense point cloud | |
| CN111474443A (en) | Method and device for measuring power transmission line | |
| CN108732587A (en) | It is a kind of that power method is determined based on scanning element cloud ranging, angle measurement | |
| CN112762790B (en) | Method for measuring crown width in three-dimensional virtual scene | |
| Nicholls | The measurement of distortion: Mathematical considerations | |
| Winemiller et al. | Assessing Surface Correspondence and Trade of Maya Figurines and Moulds Using Multi‐Stripe Laser Technology and Metrology | |
| CN107369206B (en) | Method and system for constructing three-dimensional model of corn group | |
| CN113781553A (en) | Virtual detection method for geometric precision of mechanical product based on error modeling | |
| CN117557681A (en) | High-precision topographic map generation method and device based on multi-source mapping data | |
| CN102750729A (en) | Rapid individual tree modeling method by close shot ordinary digital camera | |
| Fraser | Some thoughts on the emergence of digital close range photogrammetry | |
| CN110648280A (en) | Data processing method for splicing large-scale karst cave mass point cloud data | |
| CN106611439A (en) | Evaluation method and apparatus for DEM reconstruction algorithm | |
| Tucci et al. | Photogrammetry and 3d scanning: Assessment of metric accuracy for the digital model of danatello’s maddalena | |
| Yidan et al. | Rapeseed 3D reconstruction and morphological parameter measurement based on laser point cloud | |
| Zhang et al. | Voxel-based urban vegetation volume analysis with LiDAR point cloud | |
| CN115289999A (en) | Self-calibration method of three-dimensional laser scanning system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20220510 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |