CN103593835A - An accurate measuring method for a three dimensional image reconstruction body - Google Patents
An accurate measuring method for a three dimensional image reconstruction body Download PDFInfo
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- CN103593835A CN103593835A CN201210285608.4A CN201210285608A CN103593835A CN 103593835 A CN103593835 A CN 103593835A CN 201210285608 A CN201210285608 A CN 201210285608A CN 103593835 A CN103593835 A CN 103593835A
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Abstract
The invention relates to an accuracy measuring method for a three dimensional image reconstruction body and relates to a measuring method for a three dimensional image reconstruction body. The purpose of the present invention is to enable users to carry out accurate measuring on various data indexes in a space structure which needs to be measured and to effectively and accurately guide the users to carry out practical operations. According to the invention, through the combination of the rotation of the three-dimensional reconstruction body and the translation of a cut plane, the cutting carried out on various portions and orientations of the reconstruction body, and data storage is carried out on the cut reconstruction body through utilizing a cutting buffer and accurately calculating to obtain data indexes of the three-dimensional reconstruction body, so that the accurate measurement of the three-dimensional reconstruction body is realized. The accurate measuring method for the three dimensional image reconstruction body of the invention is mainly applied to the measurement of data indexes of various image three-dimensional bodies.
Description
Technical field
The present invention relates to a kind of measuring method of three-dimensional image rebuilding body, particularly relate to a kind of measuring method that can accurately measure each spatial data index of three-dimensional reconstruction body.
Background technology
The gordian technique of three-dimensional measurement comprises two aspects according to operation steps: 1, choosing of three dimensions mid point, and generally use mouse as interactive tool; 2, metric calculation: the calculating of straight length, angle and area, wherein area calculates comparatively complexity, and the area that relates to irregular curved surface calculates, at present there are no correlative study.Existing method for three-dimensional measurement mainly completes on three-dimensional reconstruction body based on depth buffer.First utilize mouse to pick up screen coordinate, then by depth buffer, obtain the world coordinates of space loca, finally complete corresponding measurement and calculate.Because being obtains three-dimensional point coordinate by depth buffer, in this way can only complete apart from the nearest spatial point of view plane location.For user, although be three-dimensional measurement, owing to cannot carrying out the spatial point location far away apart from view plane, cause the measurement target of measurement result and expection too wide in the gap, this measurement result tends to user to mislead.Thus, what the existing three-dimensional measurement based on depth buffer was realized is only notional three-dimensional measurement, is not practical three-dimensional measurement, is not more that practical three-dimensional is accurately measured.
Summary of the invention
The invention provides a kind of accurate measurement method of three-dimensional image rebuilding body, its objective is and can allow user make accurate measurement to each data target of the space structure of required measurement, effectively and accurately guides user is carried out practical operation.
The object of the invention is to realize by following technical proposal: a kind of accurate measurement method of three-dimensional image rebuilding body, comprises the following steps:
I, employing three-dimensional reconstruction generating virtual three-dimensional reconstruction body:
Adopt biggest advantage of light track algorithm to carry out three-dimensional reconstruction, the local coordinate system initial point of this three-dimensional reconstruction body and the initial point of world coordinate system are all three-dimensional reconstruction Ti center, and this initial point is fixed;
II, computing machine generate a cutting planes according to this three-dimensional reconstruction body:
Cutting planes is a dynamic plane for three-dimensional reconstruction body being carried out cut in real time, it will cover whole three-dimensional reconstruction body region, the initial position of cutting planes at three-dimensional reconstruction body on the direction of viewpoint, and be positioned on three-dimensional reconstruction external body edge, this cutting planes is transparent plane, and it can cut away the part that is positioned at the three-dimensional reconstruction body of the outer close viewpoint direction of plane;
III, user select for three-dimensional reconstruction body or for the operation of cutting planes:
To three-dimensional reconstruction body and cutting planes, can with keyboard and mouse, realize the operation to them respectively;
IV, choose cutting planes: user is a mouse click right button on computer screen, corresponding to the behavior of choosing cutting planes, be that right mouse button is chosen cutting planes, in the situation that pinning right mouse button, move up and down mouse, the initial point of initiation cutting planes moves along Z axis negative direction or the positive dirction of overall fixed coordinate system;
The rotation of V, three-dimensional reconstruction body: user is by the rotary manipulation of Keyboard Control three-dimensional reconstruction body, the upper and lower, left and right four direction key of keyboard respectively corresponding three-dimensional reconstruction body around X-axis be rotated in the forward, around X-axis retrograde rotation, be rotated in the forward and around Y-axis retrograde rotation around Y-axis;
VI, introducing cutting impact damper: after three-dimensional reconstruction body being cut by cutting planes, system redraws the three-dimensional reconstruction body after cutting, and in system, introduce cutting impact damper; In drawing process, along with Object representation is converted to projection coordinate, each point (X on three-dimensional reconstruction body, Y, Z) all corresponding to the subpoint (X, y) on viewing plane, in system, introduce a cutting impact damper, each unit correspondence in cutting impact damper is deposited the dot information of the three-dimensional reconstruction body being positioned on cutting planes, is mainly X, Y, the Z coordinate figure of spatial point;
VII, get a little: a mouse click left button on screen, corresponding to the operation of getting three-dimensional coordinate point in overall fixed coordinate system, now, take out in cutting impact damper cell value that should screen point, obtain the three-dimensional point coordinate figure needing;
VI, according to measuring needs, user realizes after the rotary manipulation of three-dimensional reconstruction body and the move operation of cutting planes by keyboard, mouse action, repeating step W, until oneself is through obtaining the measurement point of sufficient amount;
IX, obtain after measurement point, by calculating, complete corresponding measurement.
Accompanying drawing explanation
Fig. 1 is world coordinate system of the present invention and cutting planes schematic diagram;
Fig. 2 is the mobile schematic diagram of cutting planes of the present invention;
Fig. 3 is the three-dimensional reconstruction body cutting schematic diagram based on cutting planes of the present invention;
Fig. 4 is the schematic diagram that rotation three-dimensional reconstruction body of the present invention changes cutting zone;
Fig. 5 is three-dimensional reconstruction volume drawing step schematic block diagram of the present invention;
Fig. 6 is cutting impact damper schematic diagram of the present invention;
Fig. 7 is overall work process schematic block diagram of the present invention.
Embodiment
The accurate measurement method of a kind of three-dimensional image rebuilding body of the present invention, comprises the following steps:
1, first, adopt three-dimensional reconstruction generating virtual three-dimensional reconstruction body:
Three-dimensional reconstruction adopts Volume Rendering Techniques conventionally, and Volume Rendering Techniques is divided into iso-surface patch and the large class of direct volume drawing two.Iso-surface patch technology is volume data to be converted to a kind of face that approaches represent, thereby the hardware-accelerated technology that can utilize computer graphics techniques and oneself to have completes the extraction of information of interest.Because it represents such intermediate conversion process by means of face, rather than directly volume data is invested to screen and draw, so be referred to as again indirect volume drawing.Iso-surface patch adopts the triangle algorithm of face profile and MarchingCube algorithm to realize conventionally.Direct Volume Rendering Techniques be in some way by whole data fields translucent project on 2D screen, not by geometric figure in the middle of any.Conventional Direct volume rendering has sciagraphy and biggest advantage of light track algorithm.Biggest advantage of light track algorithm is after volume data is classified, each voxel from image space, according to a light of method reflection of setting, in the process in the body territory forming through each section at it, double sampling equally spacedly, 8 field voxels being put by each double sampling obtain color and the opacity value of sampled point with cubic curve shape interpolation method, obtain the brightness values of each sampled point, thereby obtain three-dimensional data image according to illumination model.
In the present invention, adopt biggest advantage of light track algorithm to carry out three-dimensional reconstruction, the local coordinate system initial point of this three-dimensional reconstruction body 3 and the initial point of world coordinate system are all the center of three-dimensional reconstruction body 3, and this initial point is fixed.
2, computing machine generates a cutting planes 1 according to this three-dimensional reconstruction body 3:
According to measuring needs, coordinate system and cutting planes 1 are done to following restriction:
1), world coordinate system adopts right-handed coordinate system as shown in Figure 1.
2), limit the range of movement of cutting planes 1.
Position to three-dimensional reconstruction body 3 in world coordinate system is analyzed: the initial point of world coordinate system of take is drawn out three-dimensional reconstruction body 3 as the center of three-dimensional reconstruction body 3, analyze the length L of the surperficial longest edge of initial point and three-dimensional reconstruction body 3, with this length L, add a fixing numerical value M, then result is multiplied by 2 and obtains numerical value Range, be i.e. the range of movement of cutting planes 1 in the degree of depth for this reason.
3), the local coordinate initial point of cutting planes 1 is positioned on the Z axis of overall fixed coordinate system, and limits this cutting planes 1 perpendicular to the Z axis of overall fixed coordinate system.Be that cutting planes 1 can only be carried out and furthers and the behavior of zooming out.During initialization, the coordinate figure of the initial point of cutting planes 1 in world coordinate system be (0,0, L+M).
3, user selects for three-dimensional reconstruction body 3 or for the operation of cutting planes 1:
To three-dimensional reconstruction body 3 and cutting planes 1, we realize the operation to them with keyboard and mouse respectively.
4, choose cutting planes 1: as shown in accompanying drawing 2 and accompanying drawing 3, user is a mouse click right button on computer screen, corresponding to the behavior of choosing cutting planes 1.Be that right mouse button is chosen cutting planes 1, move up and down mouse in the situation that pinning right mouse button, the initial point of initiation cutting planes 1 moves along Z axis negative direction or the positive dirction of global coordinate system, thereby removes cutting part 2 as shown in Figure 3.
5, the rotation of three-dimensional reconstruction body: as shown in Figure 4, user is by the rotary manipulation of Keyboard Control three-dimensional reconstruction body 3, the upper and lower, left and right four direction key of keyboard respectively corresponding three-dimensional reconstruction body 3 around X-axis be rotated in the forward, around X-axis retrograde rotation, be rotated in the forward and around Y-axis retrograde rotation around Y-axis.
6, after being cut by 1 pair of three-dimensional reconstruction body 3 of cutting planes, system redraws the three-dimensional reconstruction body 3 after cutting, and in system, introduce cutting impact damper 4: three-dimensional reconstruction body 3 plot step as shown in Figure 5, in drawing process, along with Object representation is converted to projection coordinate, each point (X on three-dimensional reconstruction body 3, Y, Z) all corresponding to the subpoint (x on viewing plane 5, y) 0 as shown in Figure 6, in system, introduce a cutting impact damper 4, each unit correspondence in cutting impact damper 4 is deposited the dot information of the three-dimensional reconstruction body 3 being positioned on cutting planes 1, mainly the X of spatial point, Y, Z coordinate figure.
After completing above-mentioned steps, refreshed cutting impact damper 4.Now, if certain unit is null value in cutting impact damper 4, represent in world coordinates, the cutting planes 1 place degree of depth at three-dimensional reconstruction body 3, does not have a little corresponding with the unit of viewing plane 5.If certain unit is not empty in cutting impact damper 4, represent that, in the cutting planes 1 place degree of depth, three-dimensional reconstruction body 3 has a point can correspond to the cell position of viewing plane 5, and now, value in cutting impact damper 4 is this X in global coordinate system, Y, Z value.
7, get a little: a mouse click left button on screen, corresponding to the operation of getting three-dimensional coordinate point in global coordinate system.Now, take out in cutting impact damper 4 cell value that should screen point, if it is empty, abandon this time getting point operation (because in world coordinates, the cutting planes 1 place degree of depth at three-dimensional reconstruction body 3, does not have a little corresponding with the unit of viewing plane 5), if not empty, take out the value in cutting impact damper 4, obtain the three-dimensional point coordinate figure needing.
8, according to measuring needs, user realizes after the rotary manipulation of three-dimensional reconstruction body 3 and the move operation of cutting planes 1 by keyboard, mouse action, repeating step 7, until obtained the measurement point of sufficient amount, for example, carries out range observation to volume data and only need to get starting point and two points of terminal; Measurement of angle for volume data needs to get three points.
9, obtain after measurement point, by calculating, complete corresponding measurement:
10, Whole Work Flow as shown in Figure 7.
From the feature of each step of the present invention, can find out, the invention has the advantages that by the translation of cutting planes and be combined with the rotating photo of surveyed three-dimensional reconstruction body, by introducing, cut impact damper again, user has obtained three-dimensional reconstruction body intuitively, and then by simple mouse, keyboard operation, by three-dimensional cutting in real time, accurately locate three dimensional space coordinate, thereby realized unconfined three-dimensional, accurately measure.
Claims (1)
1. an accurate measurement method for three-dimensional image rebuilding body, is characterized in that comprising the following steps:
I, employing three-dimensional reconstruction generating virtual three-dimensional reconstruction body (3):
Adopt biggest advantage of light track algorithm to carry out three-dimensional reconstruction, the local coordinate system initial point of this three-dimensional reconstruction body (3) and the initial point of world coordinate system are all the center of three-dimensional reconstruction body (3), and this initial point is fixed;
II, computing machine generate a cutting planes (1) according to this three-dimensional reconstruction body (3):
Cutting planes (1) is a dynamic plane for three-dimensional reconstruction body (3) being carried out cut in real time, it will cover whole three-dimensional reconstruction body (3) region, the initial position of cutting planes (1) at three-dimensional reconstruction body (3) on the direction of viewpoint, and be positioned on three-dimensional reconstruction body (3) external margin, this cutting planes (1) is transparent plane, and it can cut away the part that is positioned at the three-dimensional reconstruction body (3) of the outer close viewpoint direction of plane;
III, user select for three-dimensional reconstruction body (3) or for the operation of cutting planes (1):
To three-dimensional reconstruction body (3) and cutting planes (1), can with keyboard and mouse, realize the operation to them respectively;
IV, choose cutting planes:
User is a mouse click right button on computer screen; corresponding to the behavior of choosing cutting planes (1); be that right mouse button is chosen cutting planes (1); in the situation that pinning right mouse button, move up and down mouse; the initial point of initiation cutting planes (1) moves along Z axis negative direction or the positive dirction of overall fixed coordinate system, and removes cutting part (2);
The rotation of V, three-dimensional reconstruction body:
User is by the rotary manipulation of Keyboard Control three-dimensional reconstruction body (3), the upper and lower, left and right four direction key of keyboard respectively corresponding three-dimensional reconstruction body (3) around X-axis be rotated in the forward, around X-axis retrograde rotation, be rotated in the forward and around Y-axis retrograde rotation around Y-axis;
VI, introducing cutting impact damper:
After three-dimensional reconstruction body (3) being cut by cutting planes (1), system redraws the three-dimensional reconstruction body (3) after cutting, and in system, introduces cutting impact damper (4); In drawing process, along with Object representation is converted to projection coordinate, each point on three-dimensional reconstruction body (3) is all corresponding to the subpoint on viewing plane (5), in system, introduce a cutting impact damper (4), each unit correspondence in cutting impact damper (4) is deposited the dot information of the three-dimensional reconstruction body (3) being positioned on cutting planes (1), is mainly X, Y, the Z coordinate figure of spatial point;
VII, get a little:
A mouse click left button on screen, corresponding to the operation of getting three-dimensional coordinate point in overall fixed coordinate system, now, takes out in cutting impact damper (4) cell value that should screen point, obtains the three-dimensional point coordinate figure needing;
VI, according to measuring needs, user realizes after the rotary manipulation of three-dimensional reconstruction body (3) and the move operation of cutting planes (1) by keyboard, mouse action, repeating step VD, until oneself is through obtaining the measurement point of sufficient amount;
IX, obtain after measurement point, by calculating, complete corresponding measurement.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104732017A (en) * | 2015-03-03 | 2015-06-24 | 上海市政工程设计研究总院（集团）有限公司 | Dynamic sectioning and measuring method of three-dimensional engineering scene |
| CN104732016A (en) * | 2015-03-03 | 2015-06-24 | 上海市政工程设计研究总院（集团）有限公司 | Dynamic sectioning and measuring system of three-dimensional engineering scene |
| CN105677277A (en) * | 2016-01-06 | 2016-06-15 | 重庆真测科技股份有限公司 | Three-dimensional visualization section display method |
| CN105787146A (en) * | 2015-11-19 | 2016-07-20 | 厦门理工学院 | Reverse modeling method for passenger car windshield inspection mold surface model |
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2012
- 2012-08-13 CN CN201210285608.4A patent/CN103593835A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104732017A (en) * | 2015-03-03 | 2015-06-24 | 上海市政工程设计研究总院（集团）有限公司 | Dynamic sectioning and measuring method of three-dimensional engineering scene |
| CN104732016A (en) * | 2015-03-03 | 2015-06-24 | 上海市政工程设计研究总院（集团）有限公司 | Dynamic sectioning and measuring system of three-dimensional engineering scene |
| CN104732016B (en) * | 2015-03-03 | 2018-04-10 | 上海市政工程设计研究总院（集团）有限公司 | A kind of dynamic cutting of three-dimensional project scenarios and measuring system |
| CN105787146A (en) * | 2015-11-19 | 2016-07-20 | 厦门理工学院 | Reverse modeling method for passenger car windshield inspection mold surface model |
| CN105787146B (en) * | 2015-11-19 | 2019-04-09 | 厦门理工学院 | A kind of car windshield inspection modular surface model reverse modeling method |
| CN105677277A (en) * | 2016-01-06 | 2016-06-15 | 重庆真测科技股份有限公司 | Three-dimensional visualization section display method |
| CN105677277B (en) * | 2016-01-06 | 2018-09-11 | 重庆真测科技股份有限公司 | A kind of three-dimensional visualization slice display method |
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Application publication date: 20140219 |